fix(#890): Tiered PGO off in every compiling host — the .NET 10 JIT drops the isinst in Roslyn's inlined ContainingType by rbuergi · Pull Request #6254 · Systemorph/MeshWeaver

rbuergi · 2026-10-07T16:07:40Z

What was red

Three Memex.Portal.Shared.Test tests failed on unrelated PRs (#6231 run 37637952561, #6248 run 37639719471) and on main (041dde2, e383542, cbb3053):

InstallNeverInheritsRepoCompileVerdictTest.InstallingAPackageWhoseNodeFileCarriesAVerdict_LandsTheAuthoredDefinitionOnly
ModulesUpdateIndependentlyOfThePlatformTest.ABundleThatCarriesAPlatformAssembly_IsRefusedByName_AndTheSameBundleWithoutItLands
ModulesUpdateIndependentlyOfThePlatformTest.ThePlatformStaysFixed_WhileAModuleGoesNToNPlus2Live_AndAFloorAboveItIsDeclinedWhileASiblingUpdates

None of them was an assertion about module adoption. Every one died inside Roslyn: PROCESS CANNOT EMIT (#890), NRE at NamedTypeSymbol.Microsoft.Cci.ITypeDefinitionMember.get_ContainingTypeDefinition, canary=BELOW-ROSLYN … compiler=PRIVATE-COPY-EMITS image=INTACT. Once the host is in that state, every later Emit fails, including the tests' own stand-in compiles.

Why it started now: the part-1/part-2 class split is every other class of the sorted list. The classes #6128 added shifted that split, which moved InstallNeverInherits… (and #6128's own ModulesUpdateIndependently…) into part 1, behind the stand-in emits of ModulePlatformMemberLinkTest/ModuleLinkVersionTest. Since then part 1 poisoned in 4 of 12 main runs. Before #6128 those tests ran in part 2 and passed. #6230 and #6196 are not involved: the failures come before any adoption assertion runs.

The defect, measured in CI's shape

Experiment branch exp/890-tieredpgo-split-arm, run 37647154163. It reuses the poisoned PR's own build-output-3 artifact and launches part 1 exactly the way the shard does, on 14 runners per arm:

arm	poisoned	clean
defaults (+ `DOTNET_JitDisasm` capture)	4	10
`DOTNET_TieredPGO=0`	0	14

The JIT listing matches the outcome on all 14 default-arm hosts. The Tier-1 NamedTypeSymbol:AsNestedTypeDefinitionImpl inlines SourceMemberContainerTypeSymbol.ContainingType, which is _containingSymbol as NamedTypeSymbol. In all 10 clean hosts the inlined cast keeps its CORINFO_HELP_ISINSTANCEOFCLASS. In all 4 poisoned hosts it is gone (mov rax, [rbx+0x38]; jmp → test rax,rax). So a top-level type's namespace container reads as its containing type, the guard admits it, and the writer dereferences null. This happened on hosts with and without AVX-512 (VEX and EVEX). This is a .NET 10 (10.0.12 linux-x64) JIT defect, not a bug in this repo.

The change

<TieredPGO>false</TieredPGO> in the root Directory.Build.props (every executable this repo builds, including mw-plugin-test) and in test/Directory.Build.props (which does not import the root). It reaches each host as System.Runtime.TieredPGO: false in its runtimeconfig. That file is what a dotnet <name>.dll launch reads.
TieredPgoIsOffInEveryCompilingHostTest pins that the switch reaches the host, both via AppContext and in the runtimeconfig on disk. Negative control: a build with -p:TieredPGO=true fails both assertions (run locally).
NodeTypeCompilation.md gets a new section, "The defect, in one listing — the JIT drops the isinst, and Tiered PGO off removes it".

This is a workaround for a runtime defect, and it is labelled as one. Remove it only with the split arm re-run on a runtime that fixes it.

Not in this PR: the portal hosts (Memex.Portal.*, MeshWeaver.Plugins) need the same property. Until they have it, production NodeType compiles are exposed to the same per-process miscompile. Nobody has yet checked whether production replicas reach this state. No addresses need a recycle: this is a process-start setting that takes effect on the next host start.

Pairs-with: none — no public surface removed
Mirror-sync: none — no i18n catalog change

🤖 Generated with Claude Code

… JIT drops the isinst in Roslyn's inlined ContainingType Memex.Portal.Shared.Test part 1/2 poisoned in 4 of 12 main runs since the class split moved InstallNeverInheritsRepoCompileVerdictTest behind the suite's stand-in emits: every Emit in the host then throws NRE in NamedTypeSymbol.get_ContainingTypeDefinition (#890), failing InstallNeverInherits…, both ModulesUpdateIndependentlyOfThePlatformTest cases, or all of ModuleLinkVersionTest — on unrelated PRs. Reproduced in CI's own shape (run 37647154163, the poisoned PR's build-output-3, part 1 launched as the shard launches it, 14 runners per arm): defaults 4 poisoned / 10 clean, DOTNET_TieredPGO=0 0 / 14. The Tier-1 listing of NamedTypeSymbol.AsNestedTypeDefinitionImpl explains it 14 of 14: the inlined SourceMemberContainerTypeSymbol.ContainingType (`_containingSymbol as NamedTypeSymbol`) keeps its isinst in all 10 clean hosts and has none in all 4 poisoned ones, so a top-level type's namespace container reads as its containing type. TieredPGO=false in the root and test Directory.Build.props reaches every host's runtimeconfig (System.Runtime.TieredPGO). TieredPgoIsOffInEveryCompilingHostTest pins it; negative control: a build with -p:TieredPGO=true fails both assertions. Workaround for a runtime defect, documented as one in NodeTypeCompilation.md ("The defect, in one listing"). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Copilot

🟡 Changes recommended

The test guard does not verify the root configuration used by production compiling hosts such as mw-plugin-test.

1 open finding

Add a test covering root TieredPGO configuration for production hosts · New

What changed in this PR

Disables Tiered PGO to avoid a .NET 10 JIT defect that corrupts Roslyn compilation hosts.

Changes:

Disables Tiered PGO for source and test hosts.
Adds runtime configuration assertions.
Documents the diagnosis and workaround.

File	Description
`Directory.Build.props`	Disables Tiered PGO for repository executables.
`test/Directory.Build.props`	Disables Tiered PGO for test hosts.
`test/Memex.Portal.Shared.Test/TieredPgoIsOffInEveryCompilingHostTest.cs`	Verifies the test-host runtime configuration.
`src/MeshWeaver.Documentation/Data/Architecture/NodeTypeCompilation.md`	Records evidence, mechanism, and remediation.

🧠 Review effort: Balanced

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rbuergi · 2026-10-07T16:17:52Z

+/// files. Negative control: building this project with <c>-p:TieredPGO=true</c> makes both assertions
+/// fail.</para>
+/// </summary>
+public class TieredPgoIsOffInEveryCompilingHostTest


Agreed, and fixed in 4182810. BakeHostRunsWithTieredPgoOffTest in MeshWeaver.PluginTester.Test parses the runtimeconfigs the SDK copies beside it from the referenced root-inheriting executables, mw-plugin-test.runtimeconfig.json and mw-combo-verify.runtimeconfig.json, and asserts "System.Runtime.TieredPGO": false in each.

Negative control, run locally: I deleted <TieredPGO>false</TieredPGO> from the root Directory.Build.props only and left the test tree's copy in place. Both cases went red (Total: 2, Failed: 2). With the property restored, both pass. The doc section and the root-props comment now name both guards.

…ify runtimeconfigs carry TieredPGO off (review) Negative control: deleting the root property alone turns both cases red while the test tree's copy stays. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Copilot

🟢 Approval recommended

The centralized settings, regression guards, and documentation consistently address the identified runtime defect.

1 open finding

Add a test covering root TieredPGO configuration for production hosts

🧠 Review effort: Balanced

github-actions · 2026-10-07T16:31:55Z

Test Results (shard 2)

5 files ±0 5 suites ±0 4m 38s ⏱️ +3s
1 230 tests ±0 1 230 ✅ ±0 0 💤 ±0 0 ❌ ±0
1 231 runs ±0 1 231 ✅ ±0 0 💤 ±0 0 ❌ ±0

Results for commit 4182810. ± Comparison against base commit e1820b0.

github-actions · 2026-10-07T16:32:30Z

Test Results (shard 1)

1 846 tests +2 1 844 ✅ +2 4m 59s ⏱️ +39s
4 suites ±0 2 💤 ±0
4 files ±0 0 ❌ ±0

Results for commit 4182810. ± Comparison against base commit e1820b0.

github-actions · 2026-10-07T16:33:12Z

Test Results (shard 0)

3 files ±0 3 suites ±0 6m 30s ⏱️ - 1m 1s
571 tests ±0 380 ✅ ±0 191 💤 ±0 0 ❌ ±0
575 runs ±0 384 ✅ ±0 191 💤 ±0 0 ❌ ±0

Results for commit 4182810. ± Comparison against base commit e1820b0.

github-actions · 2026-10-07T16:34:37Z

Test Results (shard 3)

4 files ± 0 4 suites ±0 7m 13s ⏱️ +18s
2 654 tests +46 2 654 ✅ +46 0 💤 ±0 0 ❌ ±0
2 658 runs +46 2 658 ✅ +46 0 💤 ±0 0 ❌ ±0

Results for commit 4182810. ± Comparison against base commit e1820b0.

This pull request removes 72 and adds 118 tests. Note that renamed tests count towards both.

Memex.Portal.Shared.Test.InstanceIdRulesMatchTheRegistryTest ‑ TheSetupHostAgreesWithTheRegistry(candidate: "bde0cdbb-0f56-4038-a5ed-065af9077232")
Memex.Portal.Shared.Test.TokenProvisionedInstanceIsKeyedTest ‑ ALegacyRegistryToken_IsOperatorProvisioning
Memex.Portal.Shared.Test.TokenProvisionedInstanceIsKeyedTest ‑ ANamedRegistrysOwnToken_IsOperatorProvisioning
Memex.Portal.Shared.Test.TokenProvisionedInstanceIsKeyedTest ‑ ARegistrationKey_IsOperatorProvisioning
Memex.Portal.Shared.Test.TokenProvisionedInstanceIsKeyedTest ‑ NeitherKeyNorToken_IsTheOpenLane
Memex.Portal.Shared.Test.TokenValidationIsIssuedOffTheRouterTest ‑ TheCapture_RecordsAViolation_WhenTheRouterGenuinelyPostsWork
Memex.Portal.Shared.Test.TokenValidationIsIssuedOffTheRouterTest ‑ TokenValidationIssuedFromTheRootMeshHub_NeverPutsTheRouterOnEitherEnd
Memex.Portal.Shared.Test.TokenValidationReadinessTest ‑ FewerFailuresThanTheThreshold_StayReady
Memex.Portal.Shared.Test.TokenValidationReadinessTest ‑ GoodSample_IsReady
Memex.Portal.Shared.Test.TokenValidationReadinessTest ‑ NoStore_IsReady
…

Memex.Portal.Shared.Test.InstanceIdRulesMatchTheRegistryTest ‑ TheSetupHostAgreesWithTheRegistry(candidate: "6364b9b4-3e20-4f34-b242-2ca82282df1c")
Memex.Portal.Shared.Test.TokenMintedOnOneReplicaValidatesOnAnotherTest ‑ AFreshTokenIsValidOnTheReplicaThatDidNotMintIt
Memex.Portal.Shared.Test.TokenMintedOnOneReplicaValidatesOnAnotherTest ‑ AnUnknownTokenIsADefinitiveNegativeOnEitherReplica
Memex.Portal.Shared.Test.TokenValidationHotPathTest ‑ RealToken_ValidatesFromTheStore_AndIsCached
Memex.Portal.Shared.Test.TokenValidationHotPathTest ‑ UnknownToken_IsADefinitiveNotFound_NotUnavailable
Memex.Portal.Shared.Test.TokenValidationNegativeStagesTest ‑ ARowThatExistsButCarriesNoTokenRecord_IsLoggedUnreadable_NotNotFound
Memex.Portal.Shared.Test.TokenValidationNegativeStagesTest ‑ AnAbsentRow_IsLoggedNotFound_NeverUnreadable
Memex.Portal.Shared.Test.TokenVerdictAndCacheTest ‑ Cache_IsBounded
Memex.Portal.Shared.Test.TokenVerdictAndCacheTest ‑ Cache_NeverRemembersFailures
Memex.Portal.Shared.Test.TokenVerdictAndCacheTest ‑ Cache_RemembersSuccesses_UntilTheTtl
…

github-actions · 2026-10-07T16:35:50Z

Test Results (shard 5)

2 files ±0 2 suites ±0 8m 40s ⏱️ +5s
1 119 tests ±0 1 119 ✅ ±0 0 💤 ±0 0 ❌ ±0
1 120 runs ±0 1 120 ✅ ±0 0 💤 ±0 0 ❌ ±0

Results for commit 4182810. ± Comparison against base commit e1820b0.

github-actions · 2026-10-07T16:44:07Z

Test Results (shard 4)

4 files ± 0 4 suites ±0 16m 42s ⏱️ -8s
3 568 tests - 36 3 568 ✅ - 36 0 💤 ±0 0 ❌ ±0
3 571 runs - 36 3 571 ✅ - 36 0 💤 ±0 0 ❌ ±0

Results for commit 4182810. ± Comparison against base commit e1820b0.

This pull request removes 148 and adds 88 tests. Note that renamed tests count towards both.


   --- End of inner exception stack trace ---
   --- End of inner exception stack trace ---, expected: True)
   --- End of inner exception stack trace ---, isDenial: True)
 ---> (Inner Exception #1) MeshWeaver.Mesh.QueryProviderStalledException: Query provider(s) [pg] did not emit an Initial within the query fan-in's 16s bound for query 'nodeType:NodeType' (user 'system'). The merged Initial gates on EVERY provider, so this query has NO snapshot to answer with — it is reported as unavailable (retryable) rather than left hanging with no error. This is an availability failure, never a permission verdict: a consumer deciding access must fail CLOSED and say it could not establish the answer. Fix the stalled provider; never bump the consumer's timeout.<---
 ---> (Inner Exception #1) MeshWeaver.Messaging.Hub.Test.InfrastructureFaultTest+ProviderException (0x80004005): Failed to connect to 10.42.18.4:5432<---
 ---> (Inner Exception #1) System.ArgumentException: Value does not fall within the expected range.<---
 ---> (Inner Exception #1) System.InvalidOperationException: boom<---
 ---> (Inner Exception #1) System.InvalidOperationException: source B is misconfigured<---
 ---> (Inner Exception #1) System.Net.Sockets.SocketException (0xFFFDFFFF): Name or service not known<---
…

Memex.Portal.Shared.Test.SessionDenialIsAnAnswerTest ‑ OnlyAVerdictReadsAsADenial(shape: "the same verdict nested, as a late denial dispatch"···, failure: System.InvalidOperationException: write failed
 ---> System.UnauthorizedAccessException: Access denied
   --- End of inner exception stack trace ---, isDenial: True)
Memex.Portal.Shared.Test.TieredPgoIsOffInEveryCompilingHostTest ‑ TheRuntimeConfigOnDiskCarriesIt
Memex.Portal.Shared.Test.TieredPgoIsOffInEveryCompilingHostTest ‑ TheRuntimeIsHandedTieredPgoOff
Memex.Portal.Shared.Test.TokenProvisionedInstanceIsKeyedTest ‑ ALegacyRegistryToken_IsOperatorProvisioning
Memex.Portal.Shared.Test.TokenProvisionedInstanceIsKeyedTest ‑ ANamedRegistrysOwnToken_IsOperatorProvisioning
Memex.Portal.Shared.Test.TokenProvisionedInstanceIsKeyedTest ‑ ARegistrationKey_IsOperatorProvisioning
Memex.Portal.Shared.Test.TokenProvisionedInstanceIsKeyedTest ‑ NeitherKeyNorToken_IsTheOpenLane
Memex.Portal.Shared.Test.TokenValidationIsIssuedOffTheRouterTest ‑ TheCapture_RecordsAViolation_WhenTheRouterGenuinelyPostsWork
Memex.Portal.Shared.Test.TokenValidationIsIssuedOffTheRouterTest ‑ TokenValidationIssuedFromTheRootMeshHub_NeverPutsTheRouterOnEitherEnd
Memex.Portal.Shared.Test.TokenValidationReadinessTest ‑ FewerFailuresThanTheThreshold_StayReady
…

github-actions · 2026-10-07T16:44:35Z

Test Results

22 files ± 0 22 suites ±0 48m 43s ⏱️ -4s
10 988 tests +12 10 795 ✅ +12 193 💤 ±0 0 ❌ ±0
11 001 runs +12 10 808 ✅ +12 193 💤 ±0 0 ❌ ±0

Results for commit 4182810. ± Comparison against base commit e1820b0.

This pull request removes 40 and adds 28 tests. Note that renamed tests count towards both.


   --- End of inner exception stack trace ---
   --- End of inner exception stack trace ---, expected: True)
   --- End of inner exception stack trace ---, isDenial: True)
 ---> (Inner Exception #1) MeshWeaver.Mesh.QueryProviderStalledException: Query provider(s) [pg] did not emit an Initial within the query fan-in's 16s bound for query 'nodeType:NodeType' (user 'system'). The merged Initial gates on EVERY provider, so this query has NO snapshot to answer with — it is reported as unavailable (retryable) rather than left hanging with no error. This is an availability failure, never a permission verdict: a consumer deciding access must fail CLOSED and say it could not establish the answer. Fix the stalled provider; never bump the consumer's timeout.<---
 ---> (Inner Exception #1) MeshWeaver.Messaging.Hub.Test.InfrastructureFaultTest+ProviderException (0x80004005): Failed to connect to 10.42.18.4:5432<---
 ---> (Inner Exception #1) System.ArgumentException: Value does not fall within the expected range.<---
 ---> (Inner Exception #1) System.InvalidOperationException: boom<---
 ---> (Inner Exception #1) System.InvalidOperationException: source B is misconfigured<---
 ---> (Inner Exception #1) System.Net.Sockets.SocketException (0xFFFDFFFF): Name or service not known<---
…

Memex.Portal.Shared.Test.InstanceIdRulesMatchTheRegistryTest ‑ TheSetupHostAgreesWithTheRegistry(candidate: "6364b9b4-3e20-4f34-b242-2ca82282df1c")
Memex.Portal.Shared.Test.SessionDenialIsAnAnswerTest ‑ OnlyAVerdictReadsAsADenial(shape: "the same verdict nested, as a late denial dispatch"···, failure: System.InvalidOperationException: write failed
 ---> System.UnauthorizedAccessException: Access denied
   --- End of inner exception stack trace ---, isDenial: True)
Memex.Portal.Shared.Test.TieredPgoIsOffInEveryCompilingHostTest ‑ TheRuntimeConfigOnDiskCarriesIt
Memex.Portal.Shared.Test.TieredPgoIsOffInEveryCompilingHostTest ‑ TheRuntimeIsHandedTieredPgoOff
MeshWeaver.Compiler.Pipeline.Test.SourcesWatcherStallBackoffTest ‑ The_production_classifier_recognises_a_stall_through_every_wrapping(because: "a stall as an aggregate's FIRST member", fault: System.AggregateException: One or more errors occurred. (Query provider(s) [pg] did not emit an Initial within the query fan-in's 16s bound for query 'nodeType:NodeType' (user 'system'). The merged Initial gates on EVERY provider, so this query has NO snapshot to answer with — it is reported as unavailable (retryable) rather than left hanging with no error. This is an availability failure, never a permission verdict: a consumer deciding access must fail CLOSED and say it could not establish the answer. Fix the stalled provider; never bump the consumer's timeout.)
 ---> MeshWeaver.Mesh.QueryProviderStalledException: Query provider(s) [pg] did not emit an Initial within the query fan-in's 16s bound for query 'nodeType:NodeType' (user 'system'). The merged Initial gates on EVERY provider, so this query has NO snapshot to answer with — it is reported as unavailable (retryable) rather than left hanging with no error. This is an availability failure, never a permission verdict: a consumer deciding access must fail CLOSED and say it could not establish the answer. Fix the stalled provider; never bump the consumer's timeout.
   --- End of inner exception stack trace ---, expected: True)
MeshWeaver.Compiler.Pipeline.Test.SourcesWatcherStallBackoffTest ‑ The_production_classifier_recognises_a_stall_through_every_wrapping(because: "a stall as an aggregate's SECOND member", fault: System.AggregateException: One or more errors occurred. (The operation has timed out.) (Query provider(s) [pg] did not emit an Initial within the query fan-in's 16s bound for query 'nodeType:NodeType' (user 'system'). The merged Initial gates on EVERY provider, so this query has NO snapshot to answer with — it is reported as unavailable (retryable) rather than left hanging with no error. This is an availability failure, never a permission verdict: a consumer deciding access must fail CLOSED and say it could not establish the answer. Fix the stalled provider; never bump the consumer's timeout.)
 ---> System.TimeoutException: The operation has timed out.
   --- End of inner exception stack trace ---
 ---> (Inner Exception #1) MeshWeaver.Mesh.QueryProviderStalledException: Query provider(s) [pg] did not emit an Initial within the query fan-in's 16s bound for query 'nodeType:NodeType' (user 'system'). The merged Initial gates on EVERY provider, so this query has NO snapshot to answer with — it is reported as unavailable (retryable) rather than left hanging with no error. This is an availability failure, never a permission verdict: a consumer deciding access must fail CLOSED and say it could not establish the answer. Fix the stalled provider; never bump the consumer's timeout.<---
, expected: True)
MeshWeaver.Compiler.Pipeline.Test.SourcesWatcherStallBackoffTest ‑ The_production_classifier_recognises_a_stall_through_every_wrapping(because: "a stall nested in an aggregate inside a wrapper", fault: System.InvalidOperationException: outer
 ---> System.AggregateException: One or more errors occurred. (Value does not fall within the expected range.) (Query provider(s) [pg] did not emit an Initial within the query fan-in's 16s bound for query 'nodeType:NodeType' (user 'system'). The merged Initial gates on EVERY provider, so this query has NO snapshot to answer with — it is reported as unavailable (retryable) rather than left hanging with no error. This is an availability failure, never a permission verdict: a consumer deciding access must fail CLOSED and say it could not establish the answer. Fix the stalled provider; never bump the consumer's timeout.)
 ---> System.ArgumentException: Value does not fall within the expected range.
   --- End of inner exception stack trace ---
 ---> (Inner Exception #1) MeshWeaver.Mesh.QueryProviderStalledException: Query provider(s) [pg] did not emit an Initial within the query fan-in's 16s bound for query 'nodeType:NodeType' (user 'system'). The merged Initial gates on EVERY provider, so this query has NO snapshot to answer with — it is reported as unavailable (retryable) rather than left hanging with no error. This is an availability failure, never a permission verdict: a consumer deciding access must fail CLOSED and say it could not establish the answer. Fix the stalled provider; never bump the consumer's timeout.<---

   --- End of inner exception stack trace ---, expected: True)
MeshWeaver.Compiler.Pipeline.Test.SourcesWatcherStallBackoffTest ‑ The_production_classifier_recognises_a_stall_through_every_wrapping(because: "a stall wrapped as InnerException", fault: System.InvalidOperationException: outer
 ---> MeshWeaver.Mesh.QueryProviderStalledException: Query provider(s) [pg] did not emit an Initial within the query fan-in's 16s bound for query 'nodeType:NodeType' (user 'system'). The merged Initial gates on EVERY provider, so this query has NO snapshot to answer with — it is reported as unavailable (retryable) rather than left hanging with no error. This is an availability failure, never a permission verdict: a consumer deciding access must fail CLOSED and say it could not establish the answer. Fix the stalled provider; never bump the consumer's timeout.
   --- End of inner exception stack trace ---, expected: True)
MeshWeaver.Compiler.Pipeline.Test.SourcesWatcherStallBackoffTest ‑ The_production_classifier_recognises_a_stall_through_every_wrapping(because: "an aggregate of unrelated faults", fault: System.AggregateException: One or more errors occurred. (The operation has timed out.) (Value does not fall within the expected range.)
 ---> System.TimeoutException: The operation has timed out.
   --- End of inner exception stack trace ---
 ---> (Inner Exception #1) System.ArgumentException: Value does not fall within the expected range.<---
, expected: False)
MeshWeaver.Documentation.Test.PlatformFileReaderGuard ‑ TheBudgetMode_ReadsTheBudget_WarnsAtEightyPercent_AndNeverFailsTheJob(body: "[1,2,3]", withToken: True, expected: "REST budget: /rate_limit answered something unread"···, warns: False)
…

docs(sigsegv): sightings #19/#20 — FutuRe dumps in the unload drain's GC.Collect; #6259/#6254 not shown to explain them

Copilot AI balanced review requested due to automatic review settings October 7, 2026 16:07

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meshweaver-cloud Bot merged commit 76b171e into main Oct 7, 2026
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rbuergi added a commit that referenced this pull request Oct 8, 2026

Merge pull request #6299 from Systemorph/docs/1605-sigsegv-dump-readings

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docs(sigsegv): sightings #19/#20 — FutuRe dumps in the unload drain's GC.Collect; #6259/#6254 not shown to explain them

rbuergi mentioned this pull request Oct 8, 2026

CI: one Roslyn Emit poisons the whole process — every later compile NREs in Cci.MetadataWriter.GetConsolidatedTypeParameters, shard ends exit=124 #890

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fix(#890): Tiered PGO off in every compiling host — the .NET 10 JIT drops the isinst in Roslyn's inlined ContainingType - #6254

fix(#890): Tiered PGO off in every compiling host — the .NET 10 JIT drops the isinst in Roslyn's inlined ContainingType#6254
meshweaver-cloud[bot] merged 2 commits into
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rbuergi commented Oct 7, 2026

What was red

The defect, measured in CI's shape

The change

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🟡 Changes recommended

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🟢 Approval recommended

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