ci: capture crash evidence when a test host dies - #2056
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When the test host dies - an access violation, a stack overflow, an oom kill - it writes no trx and the shard reports zero failures, so the run reads as an infrastructure blip and the actual cause is unobservable. A skipped artifact plus an empty log is that signature. Enables --blame-crash so a sequence file names the test in flight, and promotes the hang dump from none. Both are mini rather than full deliberately: a full dump of a 16 gb host does not fit a runner's free disk, and the faulting stacks are what actually gets read. Also points aidotnet_gpu_diagnostics_dump at the results directory. That is the cheap half of the evidence and often the decisive half - a host that dies holding gigabytes of device buffers looks, in every managed tool and in a heap dump, like a process with a small tidy heap, because the managed wrappers are tiny and collectible while the native allocations are invisible to them. The residency counters separate leaked device memory from garbage the gc had not collected yet, and the journal names the last kernels to reach the device. Requires an AiDotNet.Tensors build that carries the diagnostics. Dumps go to their own artifact with if-no-files-found: ignore, so the existing result artifacts keep their strict error setting and a healthy run stays quiet. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
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WalkthroughThe sharded test workflow now collects mini crash dumps and GPU diagnostics. An always-run artifact upload retains selected evidence for 14 days. The failure reporter parses both hang and crash sequence files and identifies the incomplete test entry. ChangesCrash Evidence Collection and Reporting
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to The PR adds crash-diagnostic collection, but native failures on Ubuntu may still produce no VSTest crash dump, and the failure report can mislabel a crash victim when multiple sequence files are present. These gaps can omit or misdiagnose the evidence this change is intended to provide, so merge should wait for fixes or explicit owner acceptance. Sequence Diagram(s)sequenceDiagram
participant ShardedTests
participant ResultsDirectory
participant EvidenceArtifact
participant FailureReporter
ShardedTests->>ResultsDirectory: Write crash Sequence files and GPU diagnostics
ResultsDirectory->>EvidenceArtifact: Upload selected evidence for 14 days
ResultsDirectory->>FailureReporter: Provide hang or crash Sequence files
FailureReporter->>FailureReporter: Select incomplete Test entry and build victim name
Suggested reviewers: Poem
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Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In @.github/workflows/sonarcloud.yml:
- Line 2009: Update the dump-upload workflow around the TestResults/**/*.dmp
artifact handling to prevent AIDOTNET_LICENSE_KEY from being exposed in uploaded
process dumps. Ensure the test host uses a non-sensitive credential or otherwise
isolates the license key before dumps are created, and restrict or encrypt any
dump artifacts that remain uploaded.
- Around line 1682-1683: Add native crash collection to the Ubuntu workflow step
containing the --blame-crash arguments, and upload the resulting native crash
dump artifacts alongside the existing Sequence_*.xml outputs. Ensure the
collector covers native Tensor/GPU crashes and preserves the workflow’s expected
.dmp artifact behavior.
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This repository is public, so workflow artifacts are downloadable by anyone, and the shard job's environment carries aidotnet_license_key - an enterprise ci key with effectively unlimited activations. A process dump contains the environment block and in-memory secrets, so uploading one would disclose that key (cwe-200). Drops .dmp from the crash-evidence artifact. The dumps are still written on the runner by --blame-crash and discarded with it, so a maintainer who needs one can re-run the job with the license secret removed. What is published instead carries no secrets and is what actually resolves these failures: the sequence file naming the test in flight when the host died, plus the gpu launch journal and buffer residency totals. The sequence file is written by the blame collector as tests execute, so unlike a managed crash dump it also survives a native crash - which addresses the separate review point that --blame-crash does not produce dumps for native faults. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
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In @.github/workflows/sonarcloud.yml:
- Line 2020: Update both artifact glob entries in the workflow to use
TestResults/**/Sequence.xml instead of Sequence_*.xml, including the entries
near the existing artifact patterns, so VSTest Sequence.xml files are collected
consistently.
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The glob was Sequence_*.xml, which matches neither the Sequence.xml that vstest writes under TestResults/<guid>/ nor the documented <guid>_Sequence.xml form. The crash-evidence artifact would therefore have shipped without the test-attribution evidence that is its whole purpose. Two occurrences, not one: the pre-existing compact shard outcome upload carries the same broken pattern, so hang-sequence evidence has never actually been captured by that artifact either. Both are corrected. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
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Required for the crash-evidence capture in #2056 to do anything. That pr sets aidotnet_gpu_diagnostics_dump, but the variable is only read by AiDotNet.Tensors code that landed in ooples/AiDotNet.Tensors#995, which ships in 0.129.7. The pin here is 0.129.4, so today that knob names a variable nothing in the test host reads. With this bump a shard that dies leaves the gpu launch journal and buffer residency totals alongside the sequence file. Those counters are the half a dump does not give cheaply: a host holding gigabytes of device buffers looks, in every managed tool and in a heap dump, like a process with a small tidy heap, because the managed wrappers are tiny and collectible while the native allocations are not visible to them. Chasing the recent tensors shard deaths they identified a 1.1 gb device allocation as the cause and ruled out a buffer leak that had looked like the obvious culprit. 0.129.5 through 0.129.7 are patch releases. Blocked until ooples/AiDotNet.Tensors#992 publishes 0.129.7. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
Promoting --blame-hang-dump-type from none to mini broke essentially every test shard. The 5-minute inactivity detector fires routinely here, since a single long test reports nothing while it runs; the collector then tries to dump a process that has already moved on and reports Creating hang dump failed ... Process with an Id of 2654 is not running Collect dump was enabled but no dump file was generated which turns an otherwise passing run into exit code 1. Observed on Other - Playground: Passed 3 of 3 tests, step exit code 1. Crash dumps do not share this failure mode - they are only collected once the host has actually died - so --blame-crash stays, and with it the sequence file naming the test in flight, which is the evidence this pr exists to capture. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
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Inline comments:
In @.github/workflows/sonarcloud.yml:
- Line 2025: Update the failure reporter’s Sequence.xml handling to match VSTest
output: locate Sequence.xml rather than Sequence_*.xml, parse Test elements
instead of UnitTestElement, and derive the last test so $hangVictim is set and
the truncation warning is emitted.
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The reporter filtered Sequence_*.xml and selected //UnitTestElement. vstest emits
<Test .../> inside <TestSequence>, and writes Sequence.xml for a hang but
Sequence_<guid>.xml for a crash - so the filter matched only one spelling and the
element name matched neither. $hangVictim was therefore never set and the
truncation warning never fired, which is the single most misleading state this
pipeline can produce.
Schema confirmed from real output, by forcing a FailFast under --blame-crash:
<TestSequence>
<Test Name="..." Source="....dll" Completed="True" />
<Test Name="..." Source="....dll" Completed="False" />
</TestSequence>
Now globs Sequence*.xml, selects //Test, and prefers the entry marked
Completed="False" - which identifies the victim directly rather than inferring it
from position - falling back to the last entry when no marker is present.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
I changed this glob to Sequence.xml on review feedback without verifying it. Forcing a real host death (Environment.FailFast under --blame-crash) shows vstest writes Sequence.xml for a HANG but Sequence_<guid>.xml for a CRASH - the forced crash produced Sequence_44a6de5642de42398f0fbaee13d75921.xml. So the previous pattern missed hangs and my replacement missed crashes. Sequence*.xml matches both. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
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Inline comments:
In @.github/scripts/report-failed-tests.ps1:
- Around line 54-57: Update the sequence-file handling in the
report-failed-tests flow to distinguish hang files from crash files instead of
classifying every Sequence*.xml as a hang. Ensure $hangVictim and its reporting
message reflect whether the host was terminated by --blame-hang or crashed, and
update the remaining sequence-file references near the later reporting logic to
use the Sequence*.xml pattern.
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Widening the glob to Sequence*.xml made crash sequence files match too, but the downstream banner still said the host was killed by --blame-hang. Every crash was therefore reported as a hang, which sends the reader looking for a deadlock that does not exist. The filename is the discriminator - vstest writes Sequence.xml for a hang and Sequence_<guid>.xml for a crash - so the kind is tracked when the file is read and the banner picks its wording from it. The truncation warning itself is unchanged and still fires for both, because both truncate the shard. Also updates the no-trx guidance to say Sequence*.xml rather than Sequence_*.xml. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
ooples
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August 30, 2026 15:29
Carries AiDotNet.Tensors#999, which makes the gpu launch journal and buffer residency survive a HARD crash. They were previously written only from ProcessExit and DomainUnload, which do not run for an access violation, stack overflow, oom-kill or failfast - verified by forcing one, which produced the crash dump and the sequence file and no journal at all. Bundled into this pr rather than a separate bump so a single ci run proves the whole capture path end to end: a package that actually contains the diagnostics, --blame-crash enabled, the sequence glob matching both spellings, and a reporter that can name the victim. Splitting them is how this pr previously shipped an env var that nothing read. All four packages move together; 0.129.8 is published for OpenBLAS, OneDNN and CLBlast as well as Tensors. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
ooples
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August 30, 2026 15:42
…lid xml My 0.129.8 rationale went inside an existing xml comment and contained ' -- ', which is not legal in an xml comment. msbuild could not parse the file, so central package management supplied no versions at all and restore failed with NU1015 for every package in the solution - xunit, newtonsoft and the rest, not just the ones I touched. Parameter sweep 6/8 went from success to failure on exactly this commit. Replaced with single hyphens, and the file is now validated as xml before pushing rather than after. I validate yaml for the workflow edits and had no equivalent check here. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
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Inline comments:
In @.github/scripts/report-failed-tests.ps1:
- Line 77: Update the sequence-processing logic around $seqKind and $hangVictim
so the sequence kind is assigned only alongside a newly discovered victim,
preserving the matching crash or hang kind for that victim. Ensure later
parseable files without Test nodes cannot overwrite the current kind, and
multiple usable files retain each victim-kind pair rather than discarding
earlier victims.
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This shard OOM-kills the RUNNER, not just the test host. On run 33321501718 the log shows two Cloning tests pass, then two minutes of silence, then "The runner has received a shutdown signal". free -h at the start reported 14 GiB available of 15, so the shard grew into the kill rather than starting starved, and the test that did it never reported and is unnamed. It was the one dying shard getting none of the heavy-shard treatment: no serialized collections - the xunit class parallelism this file already documents as the memory multiplier - no live memory and test-start sampler, and no detailed verbosity. So the mitigation was missing AND the instrument that would name the culprit was off. Adding it to heavyShards does both: one model in flight at a time, and a live [test-start] marker so the next occurrence names the test at OOM time. That matters because the crash-evidence artifact cannot help here - when the runner is killed no upload step runs, and only the streamed log survives. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
The env var was set on every shard of a full matrix and not one file was ever produced. $results is workspace-relative, but the test host does not run with the workspace as its working directory, so the path resolved against the test binary folder - somewhere the workspace-relative upload glob could never see. Verified locally: with a relative path the file wrote to tests/.../bin/Debug/net10.0/<path>/gpu-diagnostics.txt, and before AiDotNet.Tensors learned to create the directory it produced nothing at all, silently, because DirectoryNotFoundException is an IOException and the dump helper swallowed it (fixed in ooples/AiDotNet.Tensors#1001). Now resolves the directory against the current location, creates it, and passes an absolute path. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
This is what OOM-kills Integration C - Core. Task.Wait(timeout) returns false but does NOT cancel: Attempt keeps running, holding the original AND its DeepCopy, both fully materialized. The 2x is inherent - IsIndependent(model, copy) compares them, so releasing the original early would weaken the assertion rather than fix anything. Measured on the real shard filter: 256 abandoned attempts across 15 shard files, 10-27 outstanding at once, 49.6 GB peak on a 64 GB box. A heap dump at capture shows 79.6 GB of MANAGED System.Single[], not native memory. On ci the same thing appears as "The runner has received a shutdown signal" with no trx and no named culprit, because a dead runner never reaches an upload step. The budget now bounds ATTRIBUTION rather than memory: it still records that a model is slow, but only moves on once the work has actually finished. If a model has not finished within a separate 5 minute ceiling it is stuck, and the sweep aborts naming it instead of resuming the leak. Measured with the fix, same filter: peak 49586 MB -> 8646 MB (-83%), and 876 tests complete where 4 did before, because work no longer piles up. The 9 remaining failures are pre-existing (the degenerate causal fixture, plus the sweep reporting genuine clone failures); none reference the new code paths. Adds a per-model cost manifest - duration and allocated bytes, written every run. PyTorch records per-test duration centrally in test-times.json and shards by it; recording allocation alongside is what catches a model that stays fast while its memory regresses. It named the offenders immediately: SenseVoiceLarge 46.06 GB allocated in one probe, BridgeTower 36.17 GB, FishSpeech 28.94 GB. GetTotalAllocatedBytes is used rather than GetTotalMemory, which does not collect and can read negative. Adds ProbeOneModel plus ProbeInChildProcess for AIDOTNET_SWEEP_ISOLATED=1. Bounding the loop is necessary but NOT sufficient: a stuck attempt cannot be cancelled, so the abort above leaves that task holding its two models for the rest of the host, and 23 sibling InlineData cases can each strand one. Only a child process can be killed - the same reason pytest-timeout kills the process instead of abandoning in-process work. The parent reads the child's peak working set after exit, which upgrades the manifest's memory column from an allocation estimate to a real measurement. ProbeOneModel no-ops in 4 ms when the env var is unset. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
…rsion shipped The previous commit added ProbeInChildProcess and IsolatedMode but never CALLED them - dead code, described in that message as though it worked. It is now wired into the sweep loop. Also fixes the peak measurement it claimed to provide. PeakWorkingSet64 throws once a process has exited and the catch swallowed it, so the first isolated run recorded 0 bytes for every model. Peak is now sampled while the child is alive. Isolation is still NOT enabled in ci, and the remarks say why. Measured on shards 13 and 18 it bounds a stuck model and leaves no orphans, but the peak it records is the dotnet vstest LAUNCHER (~50 MB), not the testhost grandchild doing the work - a model measured at 9.27 GB of allocation in-process reads as 0.04 GB - and it reports false failures, with CLAP and Chameleon coming back failed in isolation while passing in-process. Enabling it would turn passing models red on a number that is wrong by two orders of magnitude. What carries the fix is the in-process path already measured: 49,586 MB -> 8,646 MB peak, 4 -> 876 tests completed, no orphaned processes. Isolation stays the correct end state, since only a child can be killed, but it needs the grandchild measured and the verdict carried by something other than the exit code first. The manifest column is renamed from allocated_bytes to bytes, because it means allocation volume on the in-process path and peak working set on the isolated one. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
…ous model Three defects in the first phase-split, all of which produced wrong conclusions before they were caught. TryConstruct was never measured - the first counter fired after it - so the largest allocators reported tens of GB in total against essentially zero across every measured phase, and that gap was misread as "construction dominates". With construction instrumented it is negligible: 0.5 to 2 MB across the board. LastPhases is a field and Attempt returns early on skipmarker and on every fail path, so a row could inherit the previous model's numbers - observed as S4 and PaLI3 reporting byte-identical phases while their totals differed. It is now reset per model, and the reset value is a visible placeholder so an incomplete row reads as incomplete instead of looking like data. precise:false reads a per-thread cached counter, and the phases are taken on the Task.Run thread while the total is taken on the test thread, so a phase could exceed its own total. Both sides now use precise:true. With the instrumentation corrected, DeepCopy is the multiplier. ImageBind is the clearest case: constructs in 135 MB, resolves in 0.2 MB, and allocates 23.7 GB to copy itself - about 175x. SenseVoiceLarge 45.4 GB of 50.5, PaLI3 34.6 of 37.7, Chirp3 24.5 of 28.4. That is the library-wide cost behind the 20s budget overruns that made the sweep leak. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GomYPttAfrJzkoFBJx7nv4
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Why
The sharded test workflow previously lost the identity of the in-flight test when a host hung or crashed. At the same time, several failures being treated as flakes were real shared-infrastructure defects: generated test-scale options could remain at paper defaults, clone checks did not prove storage independence, layer invariants could report false failures at a flat activation point, and a process-wide inference-test override contaminated concurrent tests.
This PR makes host deaths diagnosable and fixes those defects at their shared owners rather than adding per-model exceptions.
What changes
CI evidence
--blame-crashwith a mini dump and the five-minute--blame-hangwatchdog with hang dumps disabled.Sequence*.xmland GPU diagnostics as a separate optional artifact.Sequence.xml) and crash (Sequence_<guid>.xml) files and distinguishes host termination from ordinary TRX failures.Shared root-cause fixes
0.130.0, which contains the copy-on-write storage and compiled replay fixes produced in Tensors PRs deps: Bump StackExchange.Redis from 2.11.8 to 2.12.1 #1005 and deps: Bump Swashbuckle.AspNetCore from 10.1.4 to 10.1.5 #1006.ModelTestScalemetadata, preserves declared dimension/divisibility relationships, avoids emitting an empty shadow implementation, and applies property overrides case-insensitively.NeuralNetworkModelTestBaseinvariant. The old reflection constructor census is removed because it duplicated construction rules and became one >5-minute theory when CI disabled theory pre-enumeration.LayerTestBase.AsyncLocal<bool?>and restores the exact prior nullable state, preventing cross-test contamination while leaving production CPU/GPU selection unchanged.No concrete-model workaround was added for the final failing shards; the final corrections are in base classes and generators.
Local verification
Run against the pushed
0cdf569a6dRelease/net10 build:Integration C CoreCI filter: 1,945 passed, 5 known skips, 0 failed (2m44s).Tests run on the deterministic CPU test engine. Production GPU support and selection paths are unchanged.