[xXPBSXx]

What

The guest_cnd_at_thread_exit test fails in the Sanitizers nightly of 2026-11-03 (head f6232fc) with AddressSanitizer: alloc-dealloc-mismatch (operator new vs free) at Threads.cpp:222. The test replaces the global operator new(size_t) and both operator delete overloads with malloc and free, but not the nothrow overload. _Mtx_init_nid_postfix allocates its mutex with new (std::nothrow), which under ASan is still the sanitizer's operator, so the matching delete in _Mtx_destroy_nid_postfix reaches free. The test comes from #10615 (merged 2026-11-02).

This PR defines operator new(std::size_t, const std::nothrow_t&) in the test, using malloc and returning nullptr while failAllocations is set, like the throwing overload throws.

Changes one file, core/libs/tests/GuestCndAtThreadExit.cpp (+5).

Tested

• Ubuntu 24.04 in WSL, GCC 13.3 with libasan 8, RelWithDebInfo, ANYPS5_ENABLE_ASAN=ON and -fsanitize=undefined -fno-sanitize=vptr (UBSan linked: libubsan.so.1 in the test's NEEDED list), on main d1ae628, whose GuestCndAtThreadExit.cpp and Threads.cpp are identical to the nightly head.
• cmake exited 0 and ninja exited 0 (112 s).
• Test unchanged (red): ctest -R '^guest_cnd_at_thread_exit$' failed in 2 of 2 runs with alloc-dealloc-mismatch ... _Mtx_destroy_nid_postfix ... Threads.cpp:222.
• With the fix: ninja exited 0, and the same ctest passed in 3 of 3 runs.
• python -I tools/check_conventions.py --base upstream/main passed and git diff --check is clean, on the rebased commit at main 4f41f4c.
• Not run: Windows and macOS (ASan is Linux only). Nine other tests under core/libs/tests also define operator new(std::size_t…) without a nothrow overload (GuestAllocationsOom, GuestAmmPool, GuestJsonFloatFailure, GuestPoll, GuestSocketPair, Http2TeardownFailure, JsonCopyFailure, RudpPollWaitException, UltFinalizeAllocation); I did not run them under ASan, and only this one failed in the nightly.

Overlap

Checked against main 4f41f4c with the 1684 open PRs listed at 11:07 UTC; the changed files of each PR come from git diff --name-only against its merge base, finished 12:09 UTC. No PR changes GuestCndAtThreadExit.cpp. Four PRs opened after the listing (#15449 to #15452) had no fetchable ref; their file lists read through the API (3, 4, 11 and 7 files) do not include it either. Five PRs change libc/src/Threads.cpp (#12146, #9447, #7648, #5021, #1835); none of their hunks touches _Mtx_init or _Mtx_destroy, and this PR does not change Threads.cpp. git merge-tree of this head with main is clean. Depends on: none.

Checklist

• Based on current main; no other open PR implements the same functions
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw (NotImplemented_nid_no_patch); silent stubs are listed under Silent stubs in their library's technical debt file
• No notes, investigation .md files or images added to the repository (attach them to this PR)
• New third-party code is a submodule built from source
• Generic behaviour, not specific to one title
• Depends on: none
• Fixes: none
• Unblocks: none
• GPUs tested: n/a
• AI-assisted: yes

AI-assisted (Claude Code).

🤖 Generated with Claude Code

[TechLevelZero]

✅ AMD GPU test: passed

PR head 3a8d6eb merged onto main 4f41f4c · tested 2026-11-03 13:31 UTC · 18 min

GPU	AMD Radeon RX 6300 (RADV NAVI24), driver Mesa 25.2.8-0ubuntu0.24.04.4, Vulkan 1.4.318
Host	Ubuntu 26.04.1 LTS, kernel 7.0.0-42-generic, container ubuntu:24.04
Logs	build and test logs for this run
Build	✅ passed (Release, -DANYPS5_ENABLE_SPIRV_TOOLS=ON)
Tests	✅ 1,072 passed · 5 failed (0 new, 3 also fail on main, 2 unstable on main) · 6 skipped (ANYPS5_REQUIRE_VULKAN=1)
Test setup	CPU-only tests without a GPU; GPU tests (and any CPU-only test that failed or skipped without one) once on the GPU with VK_LAYER_KHRONOS_validation and ANYPS5_NO_SHADER_CACHE=1; main ran the same way
Test selection	1,083 of 3,811 tests run: the ones this change can reach, chosen by tools/select_tests.py from main's build graph
Vulkan validation	✅ no new validation IDs vs main (524 tests run on the GPU)
Slow tests (>30 s, GPU tests timed with validation layers)	⚠️ agc_driver_pipeline_journal 120.1 s, ⚠️ public_headers 73.8 s, ⚠️ agc_driver_image_sample_unnormalized 42.2 s, ⚠️ agc_driver_lazy_resolved_abi 33.2 s

Unstable on main (2, these also failed in recent main runs on this machine; not counted against this PR)

agc_driver_pipeline_journal: failed in 7 of the last 9 main runs
agc_driver_store_over_untracked: failed in 1 of the last 9 main runs

Failing on main too (3, not counted against this PR)

agc_driver_image_table
agc_driver_native_depth_bda_clear
agc_driver_native_multisample_depth

Validation IDs already present on main (4 IDs in 446 tests)

VUID-VkDeviceCreateInfo-pNext-pNext (446 tests): agc_driver_address_passes, agc_driver_alias_copy_label, agc_driver_alpha_to_coverage, agc_driver_array_layer_target, agc_driver_bc_block_copy, agc_driver_bda_anchor_reads, agc_driver_bda_span_reads, agc_driver_bindless_images, and 438 more
VUID-vkCmdCopyImage-srcImage-01548 (8 tests): agc_driver_depth_clear_hle, agc_driver_depth_plane_buffer_memory, agc_driver_depth_plane_partial_store, agc_driver_depth_storage_dispatch, agc_driver_depth_surface_from_storage, agc_driver_dispatch_move_depth, agc_driver_stencil_null_feedback, agc_driver_stencil_plane_memory
VUID-vkCmdCopyImage-srcImage-01551 (8 tests): agc_driver_depth_clear_hle, agc_driver_depth_plane_buffer_memory, agc_driver_depth_plane_partial_store, agc_driver_depth_storage_dispatch, agc_driver_depth_surface_from_storage, agc_driver_dispatch_move_depth, agc_driver_stencil_null_feedback, agc_driver_stencil_plane_memory
VUID-VkPipelineColorBlendStateCreateInfo-pAttachments-00605 (1 test): agc_driver_srgb8_color_target

Skipped (6)

agc_driver_copied_writer_label_order: skipped, the device reports a minStorageBufferOffsetAlignment of 4, so the dispatch binds its record at +0x1004 in place and nothing is written back; the test needs an alignment above 4
agc_driver_float16_unused_nan_payloads: skipped, the device has no native f16 conversions with RTE rounding and kept f16 denormals
agc_driver_linear_target_direct_write_completion: skipped, the device does not keep host imports write-watched, so no completion stamp over the target is tracked
agc_driver_ngg_vertex_wave_reduction: skipped, s3 describes a 32-lane wave only on 32-lane subgroups, and the device has 64 lanes
agc_driver_scattered_runs: skipped, host imports are unavailable: /dev/udmabuf is not accessible
agc_driver_sparse_dma_buf_import: skipped, host imports are unavailable: /dev/udmabuf is not accessible

Reproduce

git fetch origin 3a8d6eb104841a0e775b3f38e26e95a06f475d2c 4f41f4c375f5abb487dbd184fbc150f31994d762
git checkout 4f41f4c375f5abb487dbd184fbc150f31994d762 && git merge --no-ff 3a8d6eb104841a0e775b3f38e26e95a06f475d2c
git submodule update --init --recursive
cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=ON -DANYPS5_ENABLE_SPIRV_TOOLS=ON
cmake --build build && cmake --build build --target libs
VK_DRIVER_FILES=/nonexistent/icd.json ctest --test-dir build -E '^(agc|shader|recompiler|videoout|video_out|guest_video_out|vulkan)|gpu' --timeout 120 --parallel 12 --output-on-failure
ANYPS5_REQUIRE_VULKAN=1 ANYPS5_NO_SHADER_CACHE=1 VK_INSTANCE_LAYERS=VK_LAYER_KHRONOS_validation \
  ctest --test-dir build -R '^(agc|shader|recompiler|videoout|video_out|guest_video_out|vulkan)|gpu' --timeout 120 --parallel 16 --output-on-failure
# failures are then re-run alone: --timeout 360 --parallel 2; new validation IDs: the test alone, twice, --parallel 1

_{Automated build and test on a contributor's AMD machine; it does not replace upstream CI. A new comment is posted for each new push. Full logs.}