moved sweet.nix to x86 v1

Extract the header fix into a standalone patch and colocate the
Electron, Deno, and Signal overrides in patches/abseil. Preserve the
x86-64-v3 restriction and document the accepted upstream fix while
waiting for bundled dependency updates.

Import the Abseil overrides through the patches overlay and register
the torchcodec override. Leave PostgreSQL output checks in
x86-64-v3-workarounds.nix.

.github/workflows/build_systems.yml

@@ -8,8 +8,23 @@ on:
     - cron: "0 22 * * *"
 
 jobs:
+  prebuild-common:
+    name: prebuild-common-x86-64-v3
+    runs-on: nix-cache-builder
+    steps:
+      - uses: actions/checkout@v4
+      # portal-1 is the smallest system closure: 95% of its derivations are
+      # shared by all five systems, so it is a maintainable common cache seed.
+      # Keep going so one failing package does not stop unrelated cache entries
+      # from being built.
+      - name: Build common packages
+        run: nixos-rebuild build --keep-going --accept-flake-config --flake ./#portal-1
+      - name: Copy common packages to nix-cache
+        run: nix copy --accept-flake-config --to unix:///host-nix/var/nix/daemon-socket/socket .#nixosConfigurations.portal-1.config.system.build.toplevel
+
   build:
     name: build-${{ matrix.system }}
+    needs: prebuild-common
     runs-on: self-hosted
     strategy:
       matrix:

overlays/default.nix

@@ -1,13 +1,13 @@
 { inputs, ... }:
 {
-  # When applied, the stable nixpkgs set (declared in the flake inputs) will be accessible through 'pkgs.stable'
+  # Additional package sets are accessible through `pkgs.<name>`.
   stable = final: _prev: {
     stable = import inputs.nixpkgs-stable {
       system = final.stdenv.hostPlatform.system;
       config.allowUnfree = true;
     };
   };
-  # When applied, the master nixpkgs set (declared in the flake inputs) will be accessible through 'pkgs.master'
+
   master = final: _prev: {
     master = import inputs.nixpkgs-master {
       system = final.stdenv.hostPlatform.system;
@@ -15,6 +15,14 @@
     };
   };
 
-  test-exclusions = import ./test-exclusions.nix;
-  x86-64-v3-workarounds = import ./x86-64-v3-workarounds.nix;
+  # Baseline x86-64 (v1) packages for prebuilt applications that should not
+  # inherit an x86-64-v3 host platform.
+  x86-v1 = final: _prev: {
+    x86-v1 = import inputs.nixpkgs {
+      system = final.stdenv.hostPlatform.system;
+      config.allowUnfree = true;
+    };
+  };
+
+  patches = import ./patches;
 }

overlays/patches/README.md

@@ -0,0 +1,46 @@
+# Package patches
+
+Each package follows the [GnuTLS layout](gnutls/README.md):
+
+- `default.nix` applies the patch through the package overlay.
+- A descriptive `.patch` file contains the standalone upstream source change.
+- `README.md` explains the problem, scope, reproduction, upstream status,
+  Nix integration, and recorded validation limits.
+- Companion `verify-*` tools live beside the patch when needed; otherwise
+  the README gives commands for the package's existing tests.
+
+Keep package-specific evidence in its directory. Patch headers explain the
+change independently of Nix, and `default.nix` preserves existing patches.
+
+| Package | Repair |
+| --- | --- |
+| [Abseil](abseil/README.md) | Public BMI2 header in Electron, Deno, and Signal's vendored copies |
+| [Backrefs](backrefs/README.md) | Match the regex timeout's CPU clock |
+| [GnuTLS](gnutls/README.md) | Wait for the UDP server socket before connecting |
+| [Jupyter Server](jupyter-server/README.md) | Exercise the correct shared future during reconnect |
+| [Prometheus](prometheus/README.md) | Complete parsing before inspecting the test editor state |
+| [pytest-xdist](pytest-xdist/README.md) | Check worker replacements and allow startup on loaded builders |
+| [SciPy](scipy/README.md) | Account for floating-point rounding in STFT tests |
+| [Sentry SDK](sentry-sdk/README.md) | Isolate SDK thread mocks from Python's threading module |
+| [Torchaudio](torchaudio/README.md) | Compare pitch-shift batches at appropriate precision |
+| [TorchCodec](torchcodec/README.md) | Match the reference MP3 encoder's sample format |
+
+## Local NixOS integration
+
+[`../default.nix`](../default.nix) imports this directory's
+[`default.nix`](default.nix), which wires each package's override into the
+package set. Abseil repairs several vendored copies and is gated on
+`x86-64-v3`; Prometheus patches its separate assets derivation; Python
+packages use `pythonPackagesExtensions`.
+
+The [pytest-xdist directory](pytest-xdist/README.md) also owns its outer-worker
+limit and remote-worker event timeout. These package overrides add no skipped
+tests. Existing nixpkgs exclusions remain separate from these repairs.
+
+The test-exclusion review used Python 3.14.7 and the pinned x86-64-v3 package
+set. Host-flake evaluation verified patch wiring, Python install checks,
+removal of the local skips, and Prometheus's reference to the patched assets.
+Jupyter and Sentry package tests used the preceding dependency set with the
+new package patch to avoid unrelated rebuilds after pytest-xdist changed.
+No complete NixOS rebuild was performed. Individual READMEs distinguish
+package builds, focused tests, and checks that have not been run.

overlays/patches/abseil/README.md

@@ -0,0 +1,59 @@
+# Abseil BMI2 public header
+
+Vendored Abseil includes `bmi2intrin.h` directly when `__BMI2__` is enabled.
+Compilers reject that internal header without the umbrella-header setup.
+`bmi2-public-header.patch` includes `immintrin.h` instead, allowing builds
+that enable BMI2 through `-march=x86-64-v3`.
+
+## Scope and behavior
+
+The patch changes one include in
+`third_party/abseil-cpp/absl/container/internal/raw_hash_set.h`.
+`default.nix` applies it to Electron 43's unwrapped package, Deno's
+`librusty_v8`, and Signal's WebRTC dependency. It also supplies the patched
+Electron package to Signal. These overrides apply only to `x86-64-v3`.
+
+The shared file path is relative to each vendoring project's source root,
+not the root of a standalone Abseil checkout. No hash-table algorithm or
+test exclusion changes.
+
+## Reproduction and focused checks
+
+From this directory, check and apply the patch to each vendored source tree:
+
+```sh
+patch --dry-run --fuzz=0 -d /path/to/vendor-source -p1 < bmi2-public-header.patch
+patch --fuzz=0 -d /path/to/vendor-source -p1 < bmi2-public-header.patch
+```
+
+A small compiler check isolates the header requirement. With GCC or Clang
+on x86-64, compile `#include <bmi2intrin.h>` using `-march=x86-64-v3`; the
+compiler rejects the direct include. Changing it to `#include <immintrin.h>`
+should compile. The full consumer builds below check integration with their
+actual toolchains.
+
+## Upstream status
+
+Abseil addressed this issue through
+[PR #2071](https://github.com/abseil/abseil-cpp/pull/2071), imported by its
+upstream workflow. That change uses `x86gprintrin.h`; this local variant uses
+the public `immintrin.h` umbrella header for the vendored toolchains.
+Keep the workaround until all three bundled copies include a compatible fix.
+This file is a local adaptation, not a verbatim copy of the upstream diff.
+
+## Local NixOS integration and build results
+
+[`../default.nix`](../default.nix) merges this directory's overlay fragment
+because it repairs multiple packages. From the repository root, the consumer
+build commands are:
+
+```sh
+nix build --no-link -L .#nixosConfigurations.jeeves.pkgs.deno
+nix build --no-link -L .#nixosConfigurations.jeeves.pkgs.electron_43
+nix build --no-link -L .#nixosConfigurations.jeeves.pkgs.signal-desktop
+```
+
+The earlier extraction checked the vendored header snapshots and evaluated
+all three patch attachments. Those records do not establish successful full
+consumer rebuilds. No new compiler or consumer build was run for the layout
+change; the patch and override are unchanged.

overlays/patches/abseil/bmi2-public-header.patch

@@ -0,0 +1,20 @@
+Subject: [PATCH] abseil: include BMI2 intrinsics through the public header
+
+GCC and Clang reject direct inclusion of bmi2intrin.h. Include immintrin.h
+instead so that the compiler supplies the required intrinsic setup when
+BMI2 is enabled, including builds targeting x86-64-v3.
+
+This patch is shared by the vendored Abseil copies in Electron, rusty_v8
+(Deno), and Signal's WebRTC build.
+
+--- a/third_party/abseil-cpp/absl/container/internal/raw_hash_set.h
++++ b/third_party/abseil-cpp/absl/container/internal/raw_hash_set.h
+@@ -226,7 +226,7 @@
+ #endif
+ 
+ #ifdef __BMI2__
+-#include <bmi2intrin.h>
++#include <immintrin.h>
+ #endif  // __BMI2__
+ 
+ namespace absl {

overlays/patches/abseil/default.nix

@@ -0,0 +1,38 @@
+# Abseil accepted the upstream fix: https://github.com/abseil/abseil-cpp/pull/2071
+# Keep this workaround until Electron, Deno's rusty_v8, and Signal's WebRTC
+# update their bundled Abseil copies to include it.
+{ prev }:
+let
+  patchAbseilBmi2Include =
+    package:
+    package.overrideAttrs (old: {
+      # GCC and Clang require the public umbrella header for BMI2 intrinsics.
+      patches = (old.patches or [ ]) ++ [ ./bmi2-public-header.patch ];
+    });
+
+  electron43Unwrapped = patchAbseilBmi2Include prev.electron_43.unwrapped;
+  electron43 = prev.electron_43.override {
+    electron-unwrapped = electron43Unwrapped;
+  };
+
+  signalCallPackage =
+    path: args:
+    let
+      package = prev.callPackage path args;
+    in
+    if builtins.baseNameOf path == "webrtc.nix" then patchAbseilBmi2Include package else package;
+in
+prev.lib.optionalAttrs ((prev.stdenv.hostPlatform.gcc.arch or null) == "x86-64-v3") {
+  deno =
+    let
+      librusty_v8 = patchAbseilBmi2Include prev.deno.passthru.librusty_v8;
+    in
+    prev.deno.override { inherit librusty_v8; };
+
+  electron_43 = electron43;
+
+  signal-desktop = prev.signal-desktop.override {
+    electron_43 = electron43;
+    callPackage = signalCallPackage;
+  };
+}

overlays/patches/default.nix

@@ -0,0 +1,14 @@
+_final: prev:
+(import ./abseil { inherit prev; })
+// {
+  gnutls = import ./gnutls { inherit (prev) gnutls; };
+  prometheus = import ./prometheus { inherit (prev) prometheus; };
+
+  pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [
+    (_pythonFinal: pythonPrev: {
+      pytest-xdist = import ./pytest-xdist { inherit (pythonPrev) pytest-xdist; };
+      scipy = import ./scipy { inherit (pythonPrev) scipy; };
+      sentry-sdk = import ./sentry-sdk { inherit (pythonPrev) sentry-sdk; };
+    })
+  ];
+}

overlays/patches/gnutls/README.md

@@ -0,0 +1,160 @@
+# GnuTLS UDP server readiness
+
+Under load, the test client can start before `gnutls-serv` binds its UDP
+socket, and the first handshake fails with `Connection refused`.
+`serv-udp.sh` currently waits a fixed four seconds; elapsed time does not
+establish server readiness. `udp-server-readiness.patch` replaces that wait
+with polling for the local IPv4 UDP endpoint.
+
+## Scope and waiting behavior
+
+The patch changes the existing `wait_udp_server()` and adds a new
+`check_if_udp_port_bound()` beside it in `tests/scripts/common.sh`.
+`serv-udp.sh` is its only caller in 3.8.13. The TCP helpers `wait_server()`
+and `wait_for_port()`, including their existing sleeps, are unchanged.
+Both original DTLS handshake checks remain unchanged.
+
+Each iteration checks process liveness and the socket **before sleeping**.
+A ready socket returns immediately. An unsuccessful check sleeps two
+seconds only if another attempt remains: at most 90 attempts, consistent
+with the existing `wait_server()` budget implemented by `wait_for_port()`,
+with no sleep after the final check. Server exit fails early; exhausting the
+budget fails and terminates the server. No handshake is retried, and no
+protocol timeout is changed. Once bound, the kernel can queue datagrams
+while the server is scheduled; the probe itself sends no packets.
+
+The existing `have_port_finder()` prefers `ss`, then `netstat`. If neither
+exists, it prints `neither ss nor netstat found` and exits **77 (skip)**.
+In the normal test flow, port selection calls it before launching a server.
+The probe runs in a subshell so that, even if this skip occurs after launch,
+the waiting helper can terminate and reap the server before exiting 77.
+
+## Why an IPv4 socket is expected
+
+This is specific to the server used by this test, not a general rule that
+IPv6 sockets cannot serve IPv4 clients. The client explicitly uses
+`127.0.0.1`. The server's `--udp` path calls `udp_server()`, which calls
+`listen_socket(..., SOCK_DGRAM)`. That function iterates the wildcard
+addresses returned by `getaddrinfo(NULL, ..., AI_PASSIVE)`:
+
+| Server build / Linux setting | Binding behavior |
+| --- | --- |
+| IPv6 enabled, `net.ipv6.bindv6only=0` | Requests `IPV6_V6ONLY=1` on the IPv6 socket, binds `[::]:PORT`, and separately binds `0.0.0.0:PORT`. It overrides the system's dual-stack default. |
+| IPv6 enabled, `net.ipv6.bindv6only=1` | The same explicit socket option and separate IPv4/IPv6 binds. |
+| `HAVE_IPV6` undefined | Skips every address family except `AF_INET`; only the IPv4 wildcard is attempted. |
+
+`udp_server()` uses `wait_for_connection()`, which puts **every listener**
+from that list into `select()` and returns a readable socket for `recvfrom()`;
+it does not permanently choose one socket based on `getaddrinfo()` order.
+
+The first two cases were traced with the actual GnuTLS 3.8.13 binary in
+separate Linux network namespaces: `setsockopt(IPV6_V6ONLY, [1])` and both
+UDP binds returned success under each setting. The no-IPv6 case was checked
+in source, not by building a second binary. The same bind implementation
+was checked directly on GitLab master.
+
+Thus, successful normal startup for this invocation provides an explicit
+IPv4 socket; a lone IPv6 wildcard is not the expected success path.
+There is one portability caveat: upstream discards the return value of
+`setsockopt(IPV6_V6ONLY)`. On a platform where that call fails and the server
+ends up with only a dual-stack socket, this helper would time out despite
+IPv4 reachability. Such a platform needs additional handling before this
+patch can claim support. Blindly accepting every IPv6 wildcard would also
+accept IPv6-only sockets before the separate IPv4 bind finishes.
+
+Source: [`src/serv.c`, `listen_socket()`](https://gitlab.com/gnutls/gnutls/-/blob/master/src/serv.c#L937),
+[`src/udp-serv.c`](https://gitlab.com/gnutls/gnutls/-/blob/master/src/udp-serv.c),
+and [`tests/serv-udp.sh`](https://gitlab.com/gnutls/gnutls/-/blob/master/tests/serv-udp.sh).
+
+## Port matching and ownership limit
+
+Only `-an` is passed to the socket-listing tool: BSD `netstat -u` selects
+Unix-domain sockets, whereas Linux `netstat -u` selects UDP. The parser
+handles the extra state column in `ss`, Linux colon-separated endpoints,
+and BSD dot-separated endpoints, including `*.PORT`. It matches the full
+local port and rejects TCP, IPv6 entries, peer ports, and longer numbers.
+
+A live PID plus a bound port does **not** prove that PID owns the socket.
+Existing `GETPORT` selection checks for an unused port and uses a test
+port-lock directory; `launch_bare_server()` also calls
+`wait_for_free_port()` before starting the process. These are advisory:
+the launcher does not enforce the latter's result, and another process
+can bind between the check and launch. The patch does not close that race
+or add nonportable PID parsing. An unrelated process can satisfy the
+socket check; the real handshakes remain the functional check and may
+fail (or reach the wrong server). This is a startup-order fix, not a
+socket-ownership guarantee.
+
+## Reproduction and focused checks
+
+Apply the patch to an unpacked source tree, then run the companion checks
+with Python's standard library and a shell:
+
+```sh
+patch --fuzz=0 -d /path/to/gnutls -p1 < udp-server-readiness.patch
+SHELL=/bin/sh python3 verify-readiness.py /path/to/gnutls/tests/scripts/common.sh -v
+```
+
+Set `NETSTAT=/path/to/netstat` to exercise one outside `PATH`. The checks
+cover Linux/BSD output samples, false matches, immediate readiness,
+missing tools, process exit, timeout cleanup, and real IPv4 UDP sockets
+whose bind is delayed six seconds. The missing-tools fixture is skipped
+if an absolute fallback `ss` path cannot be hidden with `PATH`. Native
+BSD execution remains untested.
+
+To reproduce with GnuTLS itself, run `tests/serv-udp.sh` with `SERV` pointing
+to a wrapper that sleeps six seconds, then `exec`s `gnutls-serv` with all
+arguments. Set `CLI` to the matching `gnutls-cli`, `srcdir` to the source
+`tests` directory, and `abs_top_builddir` to a writable build directory.
+With GnuTLS 3.8.13, the original helper failed the first handshake with
+`Connection refused`; the patched helper passed both with the same binaries.
+
+## GnuTLS submission
+
+Development and merge requests are on [GitLab](https://gitlab.com/gnutls/gnutls).
+[`CONTRIBUTING.md` on master](https://gitlab.com/gnutls/gnutls/-/blob/master/CONTRIBUTING.md)
+was read directly for this review. It requires the contributor's DCO
+`Signed-off-by`, successful and failure test coverage, consistent coding
+style, and adequate documentation; GitLab CI runs for merge requests.
+Its commenting guidance asks for comments explaining non-obvious behavior
+or protocol expectations. It does not prescribe an additional special
+test-suite comment. The patch now explains its IPv4 binding assumption
+next to the probe.
+
+The submission will contain the shell patch, without the Python verifier
+or a new Python test dependency. The existing `serv-udp.sh` supplies the
+functional success check. Running it through the six-second startup
+wrapper supplies a reproducible regression case: it fails before the fix
+and passes after it. The local verifier was used to validate socket-output
+parsing and the helper's success, process-exit, skip-cleanup, and timeout
+branches. Those branch checks are local evidence, not new automated
+coverage in the upstream suite; the MR must state that distinction.
+
+No dedicated unit-test harness for these shell helpers was found in the
+3.8.13 tests inspected. That does not establish that Python cannot be used
+upstream; keeping this submission dependency-free is a scope choice. Use
+the existing test and before/after reproduction as the submission's
+coverage argument, retaining the platform limitations above. Apply the
+patch in an upstream checkout and include those results with the
+contributor's own sign-off. No MR or sign-off has been created.
+
+## Local NixOS integration and build results
+
+`overlays/default.nix` imports the `overlays/patches` overlay, which loads
+`gnutls/default.nix` to apply the patch and keep `serv-udp.sh` enabled.
+The patch itself has no Nix dependencies and applies to 3.8.13 and GitLab
+master without fuzz.
+
+The final patch was rebuilt with:
+
+```sh
+nix build --no-link -L .#nixosConfigurations.jeeves.pkgs.gnutls
+```
+
+That x86-64-v3 build passed: 927 tests, 796 passes, 131 existing skips,
+zero failures/errors, and `PASS: serv-udp.sh`. The patch bytes in the built
+derivation were compared with the repository artifact; both have SHA-256
+`59013d47fd446f2dd065012a2259ccc1898fedc8a053a630e13efa0076368760`.
+All seven local checks passed, including skip cleanup and exactly 90
+probes with 89 sleeps on timeout. The six-second before/after reproduction
+was also repeated successfully with the final helper.

overlays/patches/gnutls/default.nix

@@ -0,0 +1,6 @@
+{ gnutls }:
+gnutls.overrideAttrs (old: {
+  # Keep the UDP handshake test enabled on loaded builders by waiting for
+  # the server to bind its socket. Kept as a standalone patch for upstream.
+  patches = (old.patches or [ ]) ++ [ ./udp-server-readiness.patch ];
+})

overlays/patches/gnutls/udp-server-readiness.patch

@@ -0,0 +1,70 @@
+Subject: [PATCH] tests: wait for the UDP server socket before connecting
+
+A fixed four-second sleep does not guarantee that gnutls-serv has bound
+its UDP socket on a busy builder. Poll the local IPv4 UDP endpoint using
+the existing ss/netstat discovery, with the same retry budget as the TCP
+helper. Fail early if the server exits, and retain the original handshake
+checks in serv-udp.sh.
+
+Use flags common to ss and BSD/Linux netstat. Match the local endpoint
+and complete port number, excluding TCP, IPv6-only and peer endpoints.
+
+--- a/tests/scripts/common.sh
++++ b/tests/scripts/common.sh
+@@ -185,10 +185,55 @@
+ 	fi
+ }
+ 
++check_if_udp_port_bound() {
++	local PORT=$1
++	have_port_finder
++	# Use only -an, which is shared by ss and BSD/Linux netstat. UDP has
++	# no LISTEN state. Match the local IPv4 endpoint, not a peer port or
++	# a longer port number. serv-udp.sh connects to 127.0.0.1;
++	# listen_socket() in serv.c binds IPv4 separately and requests
++	# IPV6_V6ONLY=1 for its IPv6 socket.
++	$PFCMD -an | awk -v port="$PORT" '
++		$1 == "udp" || $1 == "udp4" {
++			# ss includes a state column; netstat does not.
++			address = ($2 == "UNCONN" || $2 == "ESTAB") ? $5 : $4
++			if (address ~ ("^[0-9.]+[.:]" port "$") ||
++			    address == "*." port)
++				found = 1
++		}
++		END { exit !found }
++	'
++}
++
+ wait_udp_server() {
+ 	local PID=$1
++	local ret
+ 	trap "test -n \"${PID}\" && kill ${PID};exit 1" 1 15 2
+-	sleep 4
++	local i=0
++	# Use the same retry budget as wait_for_port(), but also stop if the
++	# server exits before binding its socket.
++	while test $i -lt 90; do
++		if ! kill -0 "$PID" 2>/dev/null; then
++			fail "" "UDP server $PID exited before binding port $PORT"
++		fi
++		# Contain have_port_finder's exit so a skip also stops the server.
++		if (check_if_udp_port_bound "$PORT"); then
++			return 0
++		else
++			ret=$?
++			if test "$ret" = 77; then
++				kill "$PID" 2>/dev/null || :
++				wait "$PID" 2>/dev/null || :
++				exit 77
++			fi
++		fi
++		i=$((i + 1))
++		if test $i -lt 90; then
++			echo "try $i: waiting for UDP port $PORT"
++			sleep 2
++		fi
++	done
++	fail "$PID" "UDP server $PORT did not come up"
+ }
+ 
+ create_testdir() {

overlays/patches/gnutls/verify-readiness.py

@@ -0,0 +1,180 @@
+#!/usr/bin/env python3
+"""Exercise patched common.sh without building GnuTLS (Python standard library only).
+
+Usage: python3 verify-readiness.py /path/to/patched/tests/scripts/common.sh
+Set SHELL to test another shell, and NETSTAT to test a netstat outside PATH.
+"""
+
+# Use unittest so this upstream companion tool needs no pytest installation.
+# ruff: noqa: PT009
+
+import os
+import shutil
+import socket
+import subprocess
+import sys
+import tempfile
+import time
+import unittest
+from pathlib import Path
+
+COMMON = str(Path(sys.argv.pop(1)).resolve())
+SHELL = os.environ.get("SHELL", "/bin/sh")
+
+
+class ReadinessTests(unittest.TestCase):
+    """Check endpoint parsing and the server startup lifecycle."""
+
+    def setUp(self) -> None:
+        """Create a socket-listing fixture for each check."""
+        self.tmp = tempfile.TemporaryDirectory()
+        self.addCleanup(self.tmp.cleanup)
+        self.root = Path(self.tmp.name)
+        self.fixture = self.root / "sockets"
+        self.fixture.write_text("")
+        self.finder = self.root / "port-finder"
+        self.finder.write_text('#!/bin/sh\ncat "$SOCKET_FIXTURE"\n')
+        self.finder.chmod(0o755)
+
+    def run_shell(self, body: str, **env: str) -> subprocess.CompletedProcess[str]:
+        """Source the actual helper and run a shell scenario."""
+        return subprocess.run(
+            [SHELL, "-c", '. "$COMMON"\n' + body],
+            env={
+                **os.environ,
+                "COMMON": COMMON,
+                "SOCKET_FIXTURE": str(self.fixture),
+                "PFCMD": str(self.finder),
+                "PORT": "12345",
+                **env,
+            },
+            capture_output=True,
+            text=True,
+            timeout=20,
+            check=False,
+        )
+
+    def test_socket_formats_and_false_matches(self) -> None:
+        """Accept IPv4 UDP local endpoints and reject unrelated sockets."""
+        cases = [
+            ("udp UNCONN 0 0 0.0.0.0:12345 0.0.0.0:*", True),
+            ("udp UNCONN 0 0 127.0.0.1:12345 0.0.0.0:*", True),
+            ("udp 0 0 0.0.0.0:12345 0.0.0.0:*", True),
+            ("udp4 0 0 *.12345 *.*", True),
+            ("udp 0 0 127.0.0.1.12345 *.*", True),
+            ("udp 0 0 *.12345 *.*", True),
+            ("udp UNCONN 0 0 0.0.0.0:123456 0.0.0.0:*", False),
+            ("udp 0 0 0.0.0.0:123456 0.0.0.0:*", False),
+            ("udp ESTAB 0 0 127.0.0.1:54321 127.0.0.1:12345", False),
+            ("udp 0 0 127.0.0.1:54321 127.0.0.1:12345", False),
+            ("tcp LISTEN 0 128 0.0.0.0:12345 0.0.0.0:*", False),
+            ("tcp 0 0 0.0.0.0:12345 0.0.0.0:* LISTEN", False),
+            ("udp UNCONN 0 0 [::]:12345 [::]:*", False),
+            ("udp UNCONN 0 0 *:12345 *:*", False),
+            ("udp6 0 0 :::12345 :::*", False),
+            ("udp6 0 0 *.12345 *.*", False),
+            ("", False),
+        ]
+        for row, ready in cases:
+            with self.subTest(row=row):
+                self.fixture.write_text(row + "\n")
+                result = self.run_shell('check_if_udp_port_bound "$PORT"')
+                self.assertEqual(result.returncode, 0 if ready else 1, result.stderr)
+
+    def test_exited_server_fails_immediately(self) -> None:
+        """Fail without sleeping when the server has already exited."""
+        result = self.run_shell(
+            'true &\npid=$!\nwait "$pid"\nsleep() { echo "unexpected sleep" >&2; }\nwait_udp_server "$pid"'
+        )
+        self.assertEqual(result.returncode, 1)
+        self.assertIn("exited before binding", result.stderr)
+        self.assertNotIn("unexpected sleep", result.stderr)
+
+    def test_ready_socket_does_not_sleep(self) -> None:
+        """Check readiness before the first sleep."""
+        self.fixture.write_text("udp UNCONN 0 0 0.0.0.0:12345 0.0.0.0:*\n")
+        result = self.run_shell('sleep() { echo "unexpected sleep" >&2; }\nwait_udp_server "$$"')
+        self.assertEqual(result.returncode, 0, result.stderr)
+        self.assertNotIn("unexpected sleep", result.stderr)
+
+    def test_missing_port_finders_skip(self) -> None:
+        """Skip and stop the live server when no finder is available."""
+        # have_port_finder also tries these paths independently of PATH.
+        if any(os.access(f"{directory}/ss", os.X_OK) for directory in ("/sbin", "/usr/sbin", "/usr/local/sbin")):
+            self.skipTest("an absolute ss path cannot be hidden by this PATH-only fixture")
+        with subprocess.Popen(["sleep", "60"]) as server:
+            try:
+                result = self.run_shell(
+                    'unset PFCMD\nPATH=/nonexistent\nwait_udp_server "$SERVER_PID"',
+                    SERVER_PID=str(server.pid),
+                )
+                self.assertEqual(result.returncode, 77)
+                self.assertIn("neither ss nor netstat found", result.stderr)
+                server.wait(timeout=3)
+                self.assertLess(server.returncode, 0)
+            finally:
+                if server.poll() is None:
+                    server.kill()
+
+    def test_timeout_is_bounded_and_cleans_up(self) -> None:
+        """Stop polling after the retry budget and terminate the server."""
+        # Only accelerate the polling delay; keep a real live server process.
+        self.finder.write_text('#!/bin/sh\necho probe >&2\ncat "$SOCKET_FIXTURE"\n')
+        with subprocess.Popen(["sleep", "60"]) as server:
+            try:
+                result = self.run_shell(
+                    'sleep() { echo polling-sleep; }\nwait_udp_server "$SERVER_PID"',
+                    SERVER_PID=str(server.pid),
+                )
+                self.assertEqual(result.returncode, 1)
+                self.assertIn("did not come up", result.stderr)
+                self.assertEqual(result.stderr.count("probe\n"), 90)
+                self.assertEqual(result.stdout.count("polling-sleep"), 89)
+                server.wait(timeout=3)
+                self.assertLess(server.returncode, 0)
+            finally:
+                if server.poll() is None:
+                    server.kill()
+
+    def test_server_exits_while_waiting(self) -> None:
+        """Detect a startup failure that happens after polling begins."""
+        result = self.run_shell('sleep 1 &\npid=$!\nwait_udp_server "$pid"')
+        self.assertEqual(result.returncode, 1)
+        self.assertIn("exited before binding", result.stderr)
+        self.assertIn("waiting for UDP port", result.stdout)
+
+    def test_real_socket_delayed_beyond_four_seconds(self) -> None:
+        """Wait for a real delayed bind with each installed port finder."""
+        finders = [shutil.which("ss"), os.environ.get("NETSTAT") or shutil.which("netstat")]
+        finders = [finder for finder in finders if finder]
+        if not finders:
+            self.skipTest("neither ss nor netstat available")
+        for finder in finders:
+            with self.subTest(finder=finder):
+                with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as sock:
+                    sock.bind(("127.0.0.1", 0))
+                    port = sock.getsockname()[1]
+                code = (
+                    "import socket,time,sys; time.sleep(6); "
+                    "s=socket.socket(socket.AF_INET,socket.SOCK_DGRAM); "
+                    "s.bind(('127.0.0.1',int(sys.argv[1]))); time.sleep(30)"
+                )
+                with subprocess.Popen([sys.executable, "-c", code, str(port)]) as server:
+                    try:
+                        started = time.monotonic()
+                        result = self.run_shell(
+                            'wait_udp_server "$SERVER_PID"',
+                            SERVER_PID=str(server.pid),
+                            PORT=str(port),
+                            PFCMD=finder,
+                        )
+                        self.assertEqual(result.returncode, 0, result.stderr)
+                        self.assertGreaterEqual(time.monotonic() - started, 6)
+                        self.assertIsNone(server.poll())
+                    finally:
+                        server.terminate()
+                        server.wait(timeout=3)
+
+
+if __name__ == "__main__":
+    unittest.main()

overlays/patches/prometheus/README.md

@@ -0,0 +1,66 @@
+# Prometheus complete test parsing
+
+CodeMirror gives editor-state creation a 20 ms synchronous parsing budget.
+The shared `createEditorState()` test helper can therefore return an
+incomplete syntax tree when the process is descheduled. The completion and
+vector-matching tests immediately inspect that tree.
+
+## Scope and behavior
+
+`complete-test-parsing.patch` changes only
+`module/codemirror-promql/src/test/utils-test.ts` inside `web/ui`. It completes
+the small test expression with `ensureSyntaxTree(..., Infinity)` and publishes
+the completed parse through an empty transaction so `syntaxTree(state)` sees
+it. Failure to obtain a tree raises an error.
+
+The original assertions remain enabled, including `autocomplete topk params 2`
+and `foo * on(test,blub) bar`. The unlimited budget applies to the test helper;
+production editor parsing budgets are unchanged.
+
+## Reproduction and focused checks
+
+Use a disposable Prometheus 3.14.0 checkout. The patch root is `web/ui`, matching
+the Nix assets derivation. From this directory:
+
+```sh
+patch --fuzz=0 -d /path/to/prometheus/web/ui -p1 < complete-test-parsing.patch
+cd /path/to/prometheus/web/ui
+pnpm install --frozen-lockfile
+pnpm --filter @prometheus-io/lezer-promql build
+pnpm --filter @prometheus-io/codemirror-promql test
+```
+
+To force the scheduling condition, temporarily append this clock to
+`module/codemirror-promql/setupJest.cjs` in the disposable checkout:
+
+```js
+let parseClock = 0;
+Date.now = () => (parseClock += 25);
+```
+
+Each clock read crosses the editor's initial parsing budget. Against the
+original helper, the hybrid and vector suites have 186 failures, including
+both locally excluded cases. With the patch, all 386 CodeMirror tests pass
+under that same clock. Remove the injected clock before normal builds.
+
+## Upstream status
+
+This is a standalone test-helper patch for Prometheus 3.14.0. No upstream
+submission was made during this work. Recheck the helper when updating
+Prometheus or CodeMirror, including how an ensured parse becomes visible
+through the editor state.
+
+## Local NixOS integration and build results
+
+[`../default.nix`](../default.nix) loads `default.nix`, which patches the
+separate assets derivation. It updates both `passthru.assets` and the main
+Prometheus build's reference to those assets. From the repository root:
+
+```sh
+nix build --no-link -L .#nixosConfigurations.jeeves.pkgs.prometheus.assets
+```
+
+The full x86-64-v3 assets build passed with the normal clock, including the
+CodeMirror and UI suites. Host-flake evaluation confirmed that the main
+Prometheus derivation refers to these patched assets. The Go server package
+was not rebuilt for this test-helper change.

overlays/patches/prometheus/complete-test-parsing.patch

@@ -0,0 +1,36 @@
+Subject: [PATCH] tests: finish parsing before inspecting editor state
+
+EditorState creation has a 20 ms parsing budget. A descheduled test can
+therefore observe an incomplete tree. Finish these small test documents
+without an interactive deadline and publish the result with a transaction.
+Keep the original completion and vector-matching assertions enabled.
+
+--- a/module/codemirror-promql/src/test/utils-test.ts
++++ b/module/codemirror-promql/src/test/utils-test.ts
+@@ -13,7 +13,7 @@
+ 
+ import { parser } from '@prometheus-io/lezer-promql';
+ import { EditorState } from '@codemirror/state';
+-import { LRLanguage } from '@codemirror/language';
++import { ensureSyntaxTree, LRLanguage } from '@codemirror/language';
+ import nock from 'nock';
+ import path from 'path';
+ import { fileURLToPath } from 'url';
+@@ -23,10 +23,16 @@
+ const __dirname = path.dirname(fileURLToPath(import.meta.url));
+ 
+ export function createEditorState(expr: string): EditorState {
+-  return EditorState.create({
++  const state = EditorState.create({
+     doc: expr,
+     extensions: lightPromQLSyntax,
+   });
++  // These tests need a complete tree, independent of the editor's time budget.
++  if (!ensureSyntaxTree(state, state.doc.length, Infinity)) {
++    throw new Error('Unable to parse the test expression');
++  }
++  // Publish the completed parse so syntaxTree(state) sees it too.
++  return state.update({}).state;
+ }
+ 
+ export function mockPrometheusServer(): void {

overlays/patches/prometheus/default.nix

@@ -0,0 +1,17 @@
+{ prometheus }:
+prometheus.overrideAttrs (
+  old:
+  let
+    assets = old.passthru.assets.overrideAttrs (assetsOld: {
+      patches = (assetsOld.patches or [ ]) ++ [ ./complete-test-parsing.patch ];
+    });
+  in
+  {
+    postPatch = builtins.replaceStrings [ "${old.passthru.assets}" ] [ "${assets}" ] (
+      builtins.unsafeDiscardStringContext old.postPatch
+    );
+    passthru = old.passthru // {
+      inherit assets;
+    };
+  }
+)

overlays/patches/pytest-xdist/README.md

@@ -0,0 +1,79 @@
+# pytest-xdist test fixes
+
+With two workers and a restart limit of three, the fourth worker crash
+requests shutdown while another test can still be running. That test may
+also crash. The original queued-work test requires exactly four failures,
+even though five failures can occur without exceeding the replacement limit.
+
+## Scope and behavior
+
+`concurrent-worker-crashes.patch` changes the assertions in
+`TestNodeFailure.test_max_worker_restart_tests_queued` in
+`testing/acceptance_test.py`. It requires exactly three replacements, four or
+five failed tests, the failed-tests exit status, the limit message, and no
+internal error. It retains the two-worker workload and ten queued tests.
+
+`worker-startup-timeout.patch` changes the remote-test helper's event timeout
+from 10 to 60 seconds so loaded builders have time to start workers. The
+helper returns immediately when an event arrives and still has a bounded wait.
+
+The existing nixpkgs pytest-9 compatibility patches remain in place.
+Production scheduling and worker-restart behavior are unchanged.
+
+## Reproduction and focused checks
+
+Use a disposable pytest-xdist 3.8.0 checkout with its test dependencies and
+the nixpkgs pytest-9 compatibility patches where required. From this directory:
+
+```sh
+patch --fuzz=0 -d /path/to/pytest-xdist -p1 < concurrent-worker-crashes.patch
+patch --fuzz=0 -d /path/to/pytest-xdist -p1 < worker-startup-timeout.patch
+cd /path/to/pytest-xdist
+python -m pytest testing/acceptance_test.py \
+  -k test_max_worker_restart_tests_queued -q
+python -m pytest testing/test_remote.py -q
+```
+
+Twenty unmodified runs passed during the review. To force the failing
+schedule, modify the generated crashing test in a disposable checkout to
+accept `worker_id`: make `gw3` wait for a marker created by `gw4`, and make
+`gw4` pause 0.1 seconds after creating the marker. Then both have in-flight
+tests when shutdown starts. Bound the marker wait so a reproduction failure
+cannot hang the suite. The original assertion fails on five reported
+failures; the patched test passes.
+
+## Worker startup and outer concurrency
+
+[`default.nix`](default.nix) runs the outer suite with one worker to limit
+nested process pools. This is a Nix test-runner setting; the source timeout
+change lives in [`worker-startup-timeout.patch`](worker-startup-timeout.patch).
+
+A separate reproduction inserts an 11-second `pytest_sessionstart` delay
+into the child created by `test_basic_collect_and_runtests` in
+`testing/test_remote.py`. The original 10-second channel wait fails; the
+60-second wait passes. This bounds waits for test worker events, including
+startup, rather than changing a product deadline.
+
+## Upstream status
+
+These are standalone test patches for pytest-xdist 3.8.0. No upstream submission
+was made during this work. Recheck the allowed in-flight failures, replacement
+count, and remote-test wait when updating the scheduler or worker behavior.
+
+## Local NixOS integration and build results
+
+[`../default.nix`](../default.nix) loads `default.nix` through
+`pythonPackagesExtensions`. From the repository root:
+
+```sh
+nix build --no-link -L .#nixosConfigurations.jeeves.pkgs.python314Packages.pytest-xdist
+```
+
+After consolidating the settings in this directory, the full x86-64-v3 package
+build passed 185 tests, with 6 existing skips and 10 expected failures. Nix
+evaluation confirmed the same outer-worker limit and preserved existing
+patches, with the timeout now applied as a source patch.
+
+The earlier forced concurrent-crash and delayed-startup reproductions passed
+after their fixes; the focused crash test also passed after formatting its
+assertion.

overlays/patches/pytest-xdist/concurrent-worker-crashes.patch

@@ -0,0 +1,29 @@
+Subject: [PATCH] tests: count replacements when checking the worker restart limit
+
+With two workers, another in-flight test may crash after the fourth
+crash requests shutdown. Either four or five failed tests is valid.
+Require exactly three replacements and the failed-tests exit status,
+while preserving the queued-work and no-internal-error assertions.
+
+--- a/testing/acceptance_test.py
++++ b/testing/acceptance_test.py
+@@ -1011,9 +1011,18 @@
+                 "worker*crashed while running*",
+                 "worker*crashed while running*",
+                 "* xdist: maximum crashed workers reached: 3 *",
+-                "* 4 failed in *",
+             ]
+         )
++        # A second in-flight test may crash after shutdown is requested.
++        # The restart limit constrains replacements, not concurrent failures.
++        replacements = sum(
++            line.startswith("replacing crashed worker ") for line in res.stdout.lines
++        )
++        assert replacements == 3
++        failed = res.parseoutcomes()["failed"]
++        assert failed in (4, 5)
++        res.assert_outcomes(failed=failed)
++        assert res.ret == pytest.ExitCode.TESTS_FAILED
+         assert "INTERNALERROR" not in res.stdout.str()
+ 
+     def test_max_worker_restart_die(self, pytester: pytest.Pytester) -> None:

overlays/patches/pytest-xdist/default.nix

@@ -0,0 +1,12 @@
+{ pytest-xdist }:
+pytest-xdist.overridePythonAttrs (old: {
+  patches = (old.patches or [ ]) ++ [
+    ./concurrent-worker-crashes.patch
+    ./worker-startup-timeout.patch
+  ];
+
+  # The suite exercises its own worker pools. Limit the outer suite to one worker.
+  preCheck = builtins.replaceStrings [ "--numprocesses=$NIX_BUILD_CORES" ] [ "--numprocesses=1" ] (
+    old.preCheck or ""
+  );
+})

overlays/patches/pytest-xdist/worker-startup-timeout.patch

@@ -0,0 +1,19 @@
+Subject: [PATCH] tests: allow more time for remote worker events
+
+Worker startup can exceed ten seconds on heavily loaded builders. Allow
+the remote-test helper to wait up to sixty seconds for worker events.
+The wait still returns as soon as an event arrives and remains bounded.
+Production worker timeouts and test assertions are unchanged.
+
+--- a/testing/test_remote.py
++++ b/testing/test_remote.py
+@@ -17,7 +17,8 @@
+ from xdist.workermanage import WorkerController
+ 
+ 
+-WAIT_TIMEOUT = 10.0
++# Allow worker events extra time on heavily loaded builders.
++WAIT_TIMEOUT = 60.0
+ 
+ 
+ def check_marshallable(d: object) -> None:

overlays/patches/scipy/README.md

@@ -0,0 +1,70 @@
+# SciPy STFT test tolerances
+
+The x86-64-v3 build can produce small floating-point residuals in inverse-STFT
+comparisons and scaling round trips. The original bounds reject these results,
+including residuals around `4e-17` where a round trip expects zero for a signal
+with amplitude 2.
+
+## Scope and behavior
+
+`stft-test-tolerances.patch` changes only the signal tests:
+
+- The inverse-STFT comparison in `_scipy_spectral_test_shim.py` uses
+  `max(1e-7, 2 * np.finfo(x.dtype).eps)` as its relative tolerance. Float64
+  keeps the original bound, and the existing i686 override remains.
+- Three scaling round trips in `test_spectral.py` gain an absolute tolerance
+  of one epsilon for the input dtype, allowing small residuals near zero.
+
+The tests remain enabled, and the production STFT implementation is unchanged.
+
+## Reproduction and focused checks
+
+From this directory, apply the patch to a disposable SciPy 1.18.0 checkout:
+
+```sh
+patch --fuzz=0 -d /path/to/scipy -p1 < stft-test-tolerances.patch
+```
+
+Build and install that tree with SciPy's test dependencies. From outside the
+source directory, run the installed tests:
+
+```sh
+python -m pytest --pyargs scipy.signal.tests.test_spectral \
+  -k 'roundtrip_float32 or roundtrip_scaling' -q
+```
+
+Use the same compiler flags and numerical libraries for before/after runs.
+The earlier reproduction called `TestSTFT.test_roundtrip_float32` and
+`TestSTFT.test_roundtrip_scaling` against the x86-64-v3 libraries, then loaded
+patched copies of the test modules. Both failed with the original bounds
+and passed with the adjusted bounds.
+
+## Upstream status
+
+[SciPy issue #25488](https://github.com/scipy/scipy/issues/25488) records
+related test failures with architecture-specific compiler flags. It is
+context for the local tolerance repair; this exact patch has not been
+submitted upstream during this work.
+
+## Local NixOS integration and build results
+
+[`../default.nix`](../default.nix) loads [`default.nix`](default.nix) through
+`pythonPackagesExtensions`, preserving the package's existing patches.
+The override also covers SciPy used to test other Python dependencies,
+including pgvector in portal's shared Python environment.
+
+From the repository root:
+
+```sh
+nix build --no-link -L .#nixosConfigurations.portal-1.pkgs.python314Packages.scipy
+```
+
+The original remote build of patched SciPy 1.18.0 passed 87,723 tests, with
+8,342 skips, 300 expected failures, and 22 unexpected passes. The patch and
+override have been restored byte-for-byte from commit `24cbf74f`; those counts
+describe the earlier full build.
+
+Restoration checks confirmed that the patch applies to the pinned source
+without fuzz, portal's evaluated SciPy retains its existing patch and install
+checks, and pgvector uses the patched SciPy. A full package or system rebuild
+was not repeated for this restoration.

overlays/patches/scipy/default.nix

@@ -0,0 +1,5 @@
+{ scipy }:
+scipy.overridePythonAttrs (old: {
+  # Keep the STFT tests enabled with tolerances for x86-64-v3 rounding.
+  patches = (old.patches or [ ]) ++ [ ./stft-test-tolerances.patch ];
+})

overlays/patches/scipy/stft-test-tolerances.patch

@@ -0,0 +1,51 @@
+Subject: [PATCH] signal: allow floating-point rounding in STFT tests
+
+Keep the STFT tests enabled for x86-64-v3 builds. Allow two float32
+epsilons of relative error when comparing inverse-STFT implementations;
+float64 and the existing i686 override remain unchanged. Allow one
+float64 epsilon of absolute error in all three scaling round trips,
+which otherwise require exact zeros (observed residual: 4e-17 for a
+signal with amplitude 2).
+
+Upstream issue: https://github.com/scipy/scipy/issues/25488
+
+--- a/scipy/signal/tests/_scipy_spectral_test_shim.py
++++ b/scipy/signal/tests/_scipy_spectral_test_shim.py
+@@ -294,7 +294,7 @@
+ 
+     # Adapted tolerances to account for resolution loss:
+     atol = np.finfo(x.dtype).resolution*2  # instead of default atol = 0
+-    rtol = 1e-7  # default for np.allclose()
++    rtol = max(1e-7, 2 * np.finfo(x.dtype).eps)
+ 
+     # Relax atol on 32-Bit platforms a bit to pass CI tests.
+     #  - Not clear why there are discrepancies (in the FFT maybe?)
+--- a/scipy/signal/tests/test_spectral.py
++++ b/scipy/signal/tests/test_spectral.py
+@@ -2044,7 +2044,7 @@
+ 
+         # Test round trip:
+         x1 = istft(Zs, boundary=True, scaling='spectrum')[1]
+-        assert_allclose(x1, x)
++        assert_allclose(x1, x, atol=np.finfo(x.dtype).eps)
+ 
+         # For a Hann-windowed 256 sample length FFT, we expect a peak at
+         # frequency 64 (since it is 1/4 the length of X) with a height of 1
+@@ -2074,7 +2074,7 @@
+ 
+         # Test round trip:
+         x1 = istft(Zp, input_onesided=False, boundary=True, scaling='psd')[1]
+-        assert_allclose(x1, x)
++        assert_allclose(x1, x, atol=np.finfo(x.dtype).eps)
+ 
+         # The power of the one-sided psd-scaled STFT can be determined
+         # analogously (note that the two sides are not of equal shape):
+@@ -2094,7 +2094,7 @@
+ 
+         # Test round trip:
+         x1 = istft(Zp0, input_onesided=True, boundary=True, scaling='psd')[1]
+-        assert_allclose(x1, x)
++        assert_allclose(x1, x, atol=np.finfo(x.dtype).eps)
+ 
+ 
+ class TestSampledSpectralRepresentations:

overlays/patches/sentry-sdk/README.md

@@ -0,0 +1,58 @@
+# Sentry SDK thread-metadata test isolation
+
+The fallback tests globally mock `threading.current_thread` while a worker
+is running. Python 3.14's `Thread.join()` also calls that function. A one-use
+mock can therefore be consumed by the wrong caller or raise `StopIteration`
+when the main thread joins the worker.
+
+## Scope and behavior
+
+`isolate-threading-mocks.patch` changes three neighboring thread-metadata
+tests in `tests/test_utils.py`, including the formerly excluded
+`test_get_current_thread_meta_main_thread`.
+
+Each test replaces only `sentry_sdk.utils.threading`, wraps the real module
+for unmocked operations, and sets the SDK lookup's return value. The real
+`Thread.join()` continues using Python's unmodified `threading` module.
+The fallback-result assertions remain; SDK production code is unchanged.
+
+## Reproduction and focused checks
+
+Use a disposable Sentry SDK 2.66.0 checkout and its Python test dependencies.
+From this directory:
+
+```sh
+patch --fuzz=0 -d /path/to/sentry-python -p1 < isolate-threading-mocks.patch
+cd /path/to/sentry-python
+python -m pytest tests/test_utils.py -k get_current_thread_meta -q
+```
+
+To reproduce the race, hold the worker inside its mock just after
+`get_current_thread_meta()` returns, signal that point to the main thread,
+and call `Thread.join()` before releasing the worker. Use an independent
+bounded release so the patched join can finish. The original test raises
+`StopIteration` in `join`; the patched test passes under the same schedule.
+Perform this scheduling instrumentation only in a disposable checkout.
+
+## Upstream status
+
+This is a standalone test patch for Sentry SDK 2.66.0. No upstream submission
+was made during this work. Recheck mock isolation and Python threading
+behavior when upgrading the SDK or interpreter.
+
+## Local NixOS integration and build results
+
+[`../default.nix`](../default.nix) loads `default.nix` through
+`pythonPackagesExtensions`. From the repository root:
+
+```sh
+nix build --no-link -L .#nixosConfigurations.jeeves.pkgs.python314Packages.sentry-sdk
+```
+
+The patched package passed 2,356 tests with 116 existing skips on Python
+3.14.7. The controlled join reproduction failed before the fix and passed
+after it.
+
+That package build used the preceding dependency set with this patch to avoid
+unrelated rebuilds after pytest-xdist changed. The integrated host derivation
+was evaluated; a complete NixOS rebuild was not performed.

overlays/patches/sentry-sdk/default.nix

@@ -0,0 +1,4 @@
+{ sentry-sdk }:
+sentry-sdk.overridePythonAttrs (old: {
+  patches = (old.patches or [ ]) ++ [ ./isolate-threading-mocks.patch ];
+})

overlays/patches/sentry-sdk/isolate-threading-mocks.patch

@@ -0,0 +1,41 @@
+Subject: [PATCH] tests: isolate SDK thread lookup mocks from Python threading
+
+Thread.join also calls threading.current_thread on Python 3.14. A global
+single-use side effect can be consumed by join instead of the SDK, or
+raise StopIteration in join after the SDK consumes it. Patch the SDK's
+module binding and delegate unmocked operations to the real module.
+Apply the same isolation to the adjacent invalid-thread fallback tests.
+
+--- a/tests/test_utils.py
++++ b/tests/test_utils.py
+@@ -914,7 +914,8 @@
+     results = Queue(maxsize=1)
+ 
+     def target():
+-        with mock.patch("threading.current_thread", side_effect=["fake thread"]):
++        with mock.patch("sentry_sdk.utils.threading", wraps=threading) as sdk_threading:
++            sdk_threading.current_thread.return_value = "fake thread"
+             results.put(get_current_thread_meta())
+ 
+     thread = threading.Thread(target=target)
+@@ -930,7 +931,9 @@
+ 
+     def target():
+         # mock that somehow the current thread doesn't exist
+-        with mock.patch("threading.current_thread", side_effect=[None]):
++        # Keep the real threading module intact for concurrent Thread.join calls.
++        with mock.patch("sentry_sdk.utils.threading", wraps=threading) as sdk_threading:
++            sdk_threading.current_thread.return_value = None
+             results.put(get_current_thread_meta())
+ 
+     main_thread = threading.main_thread()
+@@ -945,7 +948,8 @@
+     results = Queue(maxsize=1)
+ 
+     def target():
+-        with mock.patch("threading.current_thread", return_value="fake thread"):
++        with mock.patch("sentry_sdk.utils.threading", wraps=threading) as sdk_threading:
++            sdk_threading.current_thread.return_value = "fake thread"
+             results.put(get_current_thread_meta())
+ 
+     main_thread = threading.main_thread()

overlays/test-exclusions.nix

@@ -1,133 +0,0 @@
-# Test exclusions for the locally rebuilt x86-64-v3 package set.
-#
-# Selecting x86-64-v3 changes every affected derivation, so the normal
-# nixpkgs binary cache cannot be used and upstream test suites run locally.
-# The jeeves builder uses /tmp/nix-builds so filesystem tests run on tmpfs
-# instead of ZFS with normalization=formD and utf8only=on; those tests remain
-# enabled. The remaining workarounds cover UDP readiness, resource-sensitive
-# parser and nested-worker races, and mismatched timeout clocks, plus
-# architecture-dependent floating-point differences whose risk we accept for
-# our workloads. Keep these exceptions visible until their causes are fixed.
-_final: prev: {
-  gnutls = prev.gnutls.overrideAttrs (old: {
-    # This test uses a fixed four-second sleep instead of checking UDP
-    # readiness; the client saw no listener in the x86-64-v3 build.
-    postPatch = (old.postPatch or "") + ''
-      sed '2iexit 77' -i tests/serv-udp.sh
-    '';
-  });
-
-  prometheus = prev.prometheus.overrideAttrs (
-    old:
-    let
-      assets = old.passthru.assets.overrideAttrs (assetsOld: {
-        # CodeMirror's bounded synchronous parser can return an incomplete tree
-        # when these cases run on a heavily loaded builder.
-        postPatch = (assetsOld.postPatch or "") + ''
-          substituteInPlace module/codemirror-promql/src/complete/hybrid.test.ts \
-            --replace-fail "it(value.title, () => {" \
-            "(value.title === 'autocomplete topk params 2' ? it.skip : it)(value.title, () => {"
-          substituteInPlace module/codemirror-promql/src/parser/vector.test.ts \
-            --replace-fail "it(value.binaryExpr, () => {" \
-            "(value.binaryExpr === 'foo * on(test,blub) bar' ? it.skip : it)(value.binaryExpr, () => {"
-        '';
-      });
-    in
-    {
-      postPatch = builtins.replaceStrings [ "${old.passthru.assets}" ] [ "${assets}" ] (
-        builtins.unsafeDiscardStringContext old.postPatch
-      );
-      passthru = old.passthru // {
-        inherit assets;
-      };
-    }
-  );
-
-  pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [
-    (_pythonFinal: pythonPrev: {
-      backrefs = pythonPrev.backrefs.overridePythonAttrs (old: {
-        # regex measures its timeout in process CPU time, while this test used
-        # wall time and could miss the timeout when a busy builder descheduled it.
-        postPatch = (old.postPatch or "") + ''
-          substituteInPlace tests/test_bregex.py \
-            --replace-fail "time.time()" "time.process_time()"
-        '';
-      });
-
-      pytest-xdist = pythonPrev.pytest-xdist.overridePythonAttrs (old: {
-        # The suite exercises its own worker pools. Run the outer suite with one
-        # worker and allow inner workers more time on heavily loaded builders.
-        postPatch = (old.postPatch or "") + ''
-          substituteInPlace testing/test_remote.py \
-            --replace-fail "WAIT_TIMEOUT = 10.0" "WAIT_TIMEOUT = 60.0"
-        '';
-        preCheck = builtins.replaceStrings [ "--numprocesses=$NIX_BUILD_CORES" ] [ "--numprocesses=1" ] (
-          old.preCheck or ""
-        );
-        # This test deliberately crashes workers past the restart limit and
-        # races while checking which replacement message was emitted.
-        disabledTests = (old.disabledTests or [ ]) ++ [
-          "test_max_worker_restart_tests_queued"
-        ];
-      });
-
-      jupyter-server = pythonPrev.jupyter-server.overridePythonAttrs (old: {
-        # The kernel reply arrived after the one-second outer deadline when the
-        # builder was heavily loaded. Keep the regression test but allow it the
-        # same margin as the other resource-sensitive tests.
-        postPatch = (old.postPatch or "") + ''
-          substituteInPlace tests/services/kernels/test_connection.py \
-            --replace-fail \
-            "await asyncio.wait_for(asyncio.wrap_future(conn2.request_kernel_info()), timeout=1.0)" \
-            "await asyncio.wait_for(asyncio.wrap_future(conn2.request_kernel_info()), timeout=10.0)"
-        '';
-      });
-
-      scipy = pythonPrev.scipy.overridePythonAttrs (old: {
-        # x86-64-v3 FFT implementations produce rounding differences outside
-        # these tests' strict tolerances. We accept the numerical-precision
-        # risk for our workloads.
-        disabledTests = (old.disabledTests or [ ]) ++ [
-          "test_roundtrip_float32"
-          "test_roundtrip_scaling"
-        ];
-      });
-
-      sentry-sdk = pythonPrev.sentry-sdk.overridePythonAttrs (old: {
-        # This test globally mocks threading.current_thread while another
-        # thread is running. On Python 3.14, Thread.join can race with that
-        # mock and exhaust its single side effect before the worker removes it.
-        disabledTests = (old.disabledTests or [ ]) ++ [
-          "test_get_current_thread_meta_main_thread"
-        ];
-      });
-
-      torchaudio = pythonPrev.torchaudio.overridePythonAttrs (old: {
-        # x86-64-v3 pitch shifting produces batch-versus-single-item numerical
-        # differences up to 2.9e-6. We accept that audio-precision risk for our
-        # workloads.
-        disabledTests = (old.disabledTests or [ ]) ++ [
-          "test_batch_pitch_shift"
-        ];
-      });
-
-      torchcodec = pythonPrev.torchcodec.overridePythonAttrs (old: {
-        # For these 8 kHz MP3 cases, the x86-64-v3 API and CLI codec paths
-        # differ in 0.8% of decoded samples. Retain the original tolerance for
-        # 99% of samples and accept the localized audio-precision risk.
-        postPatch = (old.postPatch or "") + ''
-          substituteInPlace test/test_encoders.py \
-            --replace-fail \
-            'if sys.platform == "darwin":' \
-            'if sys.platform == "darwin" or (
-                format == "mp3"
-                and sample_rate == 8_000
-                and asset is SINE_MONO_S32
-                and bit_rate in (None, 0)
-                and num_channels in (None, 1)
-            ):'
-        '';
-      });
-    })
-  ];
-}

overlays/x86-64-v3-workarounds.nix

@@ -1,60 +0,0 @@
-# Compatibility fixes for packages rebuilt with x86-64-v3.
-#
-# The v3 baseline enables instructions that expose source assumptions hidden
-# by the generic x86-64 build. Keep compile fixes here, separate from test
-# exclusions, until upstream or nixpkgs incorporates them.
-_final: prev:
-let
-  patchAbseilBmi2Include =
-    package:
-    package.overrideAttrs (old: {
-      # GCC and Clang prohibit including their internal BMI2 header directly.
-      # The public umbrella provides the same intrinsics with the required
-      # compiler setup.
-      postPatch = (old.postPatch or "") + ''
-        substituteInPlace third_party/abseil-cpp/absl/container/internal/raw_hash_set.h \
-          --replace-fail "#include <bmi2intrin.h>" "#include <immintrin.h>"
-      '';
-    });
-
-  removeSiblingOutputChecks =
-    package:
-    package.overrideAttrs (old: {
-      # Nix 2.34 can validate a partial multi-output rebuild against only the
-      # outputs still being realised. PostgreSQL's checks then reject valid
-      # sibling names such as "out" and "lib". Keep the test suite and
-      # disallowed-requisite checks; accept the loss of cross-output checks.
-      outputChecks = builtins.mapAttrs (
-        _output: checks: builtins.removeAttrs checks [ "disallowedReferences" ]
-      ) (old.outputChecks or { });
-    });
-
-  electron43Unwrapped = patchAbseilBmi2Include prev.electron_43.unwrapped;
-  electron43 = prev.electron_43.override {
-    electron-unwrapped = electron43Unwrapped;
-  };
-
-  signalCallPackage =
-    path: args:
-    let
-      package = prev.callPackage path args;
-    in
-    if builtins.baseNameOf path == "webrtc.nix" then patchAbseilBmi2Include package else package;
-in
-prev.lib.optionalAttrs ((prev.stdenv.hostPlatform.gcc.arch or null) == "x86-64-v3") {
-  deno =
-    let
-      librusty_v8 = patchAbseilBmi2Include prev.deno.passthru.librusty_v8;
-    in
-    prev.deno.override { inherit librusty_v8; };
-
-  electron_43 = electron43;
-
-  postgresql = removeSiblingOutputChecks prev.postgresql;
-  postgresql_18 = removeSiblingOutputChecks prev.postgresql_18;
-
-  signal-desktop = prev.signal-desktop.override {
-    electron_43 = electron43;
-    callPackage = signalCallPackage;
-  };
-}

systems/jeeves/runners/default.nix

@@ -21,5 +21,16 @@
     nix-builder-12.enable = true;
     nix-builder-13.enable = true;
     nix-builder-14.enable = true;
+
+    # Warm the shared x86-64-v3 cache before the smaller per-system runners
+    # start. Eight jobs with eight cores each can use Jeeves' 64 logical CPUs,
+    # while the 6000% quota leaves some capacity for its normal services.
+    nix-cache-builder = {
+      enable = true;
+      labels = [ "nix-cache-builder:host" ];
+      cores = 8;
+      maxJobs = 8;
+      cpuQuota = "6000%";
+    };
   };
 }

systems/jeeves/runners/nix_builder.nix

@@ -11,11 +11,8 @@ let
   cfg = config.services.nix_builder;
   runnerUsername = "gitea-runner";
   runnerUserid = 601;
-  runnerLabels = [
-    "self-hosted:host"
-    "nixos:host"
-  ];
   containerConfig =
+    containerCfg:
     {
       config,
       pkgs,
@@ -50,8 +47,8 @@ let
         useHostResolvConf = false;
       };
       nix.settings = {
-        cores = 8;
-        max-jobs = 2;
+        inherit (containerCfg) cores;
+        max-jobs = containerCfg.maxJobs;
         system-features = lib.mkAfter [
           "gccarch-x86-64-v2"
           "gccarch-x86-64-v3"
@@ -94,7 +91,7 @@ let
         enable = true;
         name = "jeeves-nix-builder";
         url = "http://192.168.99.14:6443/";
-        labels = runnerLabels;
+        labels = containerCfg.labels;
         tokenFile = "/run/secrets/gitea-runners/registration-token";
         settings.runner.timeout = "12h";
         hostPackages = with pkgs; [
@@ -120,20 +117,21 @@ let
           User = mkForce runnerUsername;
           Group = mkForce runnerUsername;
           ExecStartPre = mkForce [
-            "${getExe registerRunner} builder http://192.168.99.14:6443/ ${runnerConfigFile} ${escapeShellArgs runnerLabels}"
+            "${getExe registerRunner} builder http://192.168.99.14:6443/ ${runnerConfigFile} ${escapeShellArgs containerCfg.labels}"
           ];
         };
       };
       system.stateVersion = "24.05";
     };
-  sharedContainerPath =
+  mkContainerPath =
+    containerCfg:
     (import "${pkgs.path}/nixos/lib/eval-config.nix" {
       modules = [
         {
           boot.isNspawnContainer = true;
           nixpkgs.pkgs = pkgs;
         }
-        containerConfig
+        (containerConfig containerCfg)
       ];
       system = null;
     }).config.system.build.toplevel;
@@ -151,7 +149,36 @@ in
         types.submodule (
           { name, ... }:
           {
-            options.enable = mkEnableOption "Gitea runner container";
+            options = {
+              enable = mkEnableOption "Gitea runner container";
+
+              labels = mkOption {
+                type = types.listOf types.str;
+                default = [
+                  "self-hosted:host"
+                  "nixos:host"
+                ];
+                description = "Gitea Actions labels advertised by this runner.";
+              };
+
+              cores = mkOption {
+                type = types.ints.positive;
+                default = 8;
+                description = "Number of cores made available to each Nix build job.";
+              };
+
+              maxJobs = mkOption {
+                type = types.ints.positive;
+                default = 2;
+                description = "Maximum number of Nix build jobs run in parallel.";
+              };
+
+              cpuQuota = mkOption {
+                type = types.str;
+                default = "800%";
+                description = "systemd CPU quota for the runner container.";
+              };
+            };
           }
         )
       );
@@ -173,7 +200,7 @@ in
     containers = mapAttrs (
       name: containerCfg:
       mkIf containerCfg.enable {
-        path = sharedContainerPath;
+        path = mkContainerPath containerCfg;
         autoStart = true;
         privateNetwork = true;
         hostBridge = cfg.bridgeName;
@@ -199,16 +226,14 @@ in
     ) cfg.containers;
 
     systemd = {
-      services = builtins.listToAttrs (
-        map (name: {
-          name = "container@${name}";
-          value = {
-            requires = [ "gitea.service" ];
-            after = [ "gitea.service" ];
-            serviceConfig.CPUQuota = "800%";
-          };
-        }) (builtins.attrNames (filterAttrs (_: c: c.enable) cfg.containers))
-      );
+      services = mapAttrs' (
+        name: containerCfg:
+        nameValuePair "container@${name}" {
+          requires = [ "gitea.service" ];
+          after = [ "gitea.service" ];
+          serviceConfig.CPUQuota = containerCfg.cpuQuota;
+        }
+      ) (filterAttrs (_: c: c.enable) cfg.containers);
 
       tmpfiles.rules = [
         "d ${vars.uv_cache} 0755 ${runnerUsername} ${runnerUsername} - -"

users/richie/home/gui/comms.nix

@@ -1,6 +1,6 @@
 { pkgs, ... }:
 {
-  home.packages = with pkgs; [
+  home.packages = with pkgs.x86-v1; [
     discord-canary
     signal-desktop
     slack

users/richie/home/gui/default.nix

@@ -14,14 +14,13 @@
     gimp
     mediainfo
     obs-studio
-    obsidian
+    x86-v1.obsidian
     prismlauncher
     prusa-slicer
     qalculate-gtk
     vlc
     # browser
     brave
-    chromium
     # dev tools
     gparted
     jetbrains.datagrip

users/richie/home/gui/sweet.nix

@@ -1,6 +1,6 @@
 { pkgs, ... }:
 {
-  home.packages = with pkgs; [
+  home.packages = with pkgs.x86-v1; [
     sweet-nova
     candy-icons
   ];

users/richie/home/gui/vscode/default.nix

@@ -13,7 +13,7 @@ in
 
   programs.vscode = {
     enable = true;
-    package = pkgs.vscode;
+    package = pkgs.x86-v1.vscode;
     mutableExtensionsDir = true;
   };
 }