[CI] fsharplibrary ILLink substitutions remove six missing F# resources (IL2040)

[dalexsoto]

Failure signature

fsharplibrary embeds ILLink.Substitutions.xml, but its resource-removal directives name six resources absent from the assembly: FSharpSignatureDataB.fsharplibrary, FSharpOptimizationInfo.fsharplibrary, FSharpOptimizationData.fsharplibrary, FSharpSignatureData.fsharplibrary, FSharpSignatureInfo.fsharplibrary, and FSharpOptimizationDataB.fsharplibrary. _RunILLink reports six IL2040 errors, then NETSDK1144. This is a source/dependency resource mismatch before test execution, not a flaky test or CI infrastructure outage. The upstream step that produced the mismatched descriptor has not been isolated.

Confirmed monitored PRs and occurrences

• #26683: 170 confirmed configuration failures across three heads/runs, one distinct PR: 204bc97f6a535e1dfc37d1f0231ad8722386fa24 / run 15441688 (59 records, five jobs; e.g. T: monotouch_macos / Run tests); 5cb483e94709208bac50a4a7b28350032626419b / run 15445962 (58 records, four jobs); e1ab40f6e574416ce3684d64243b04e9cd4f6ae5 / run 15461912 (53 records, four jobs). Azure TestSummary and per-variation binlogs confirm the same six-resource signature on macOS, Mac Catalyst, iOS, and tvOS.
• #26695: head 4fc295ad233069ddec98069c6f2239f858122846, simulator run 15482109 / Build macOS tests / Package macOS tests, stage/job/task attempt 1, one new confirmed occurrence. The preceding Build task succeeded, but build-maccatalyst-dotnet-arm64-monotouch-test failed while packaging tests at 2026-09-27 22:34:01 UTC with the identical six IL2040 resources and NETSDK1144. The parent run was still active at diagnosis. A newer head 837a18b460563abb04e7c5cc1aabc1c510f9e9a1 has separate CI; it does not establish a fix for this root.

Totals: 171 confirmed failure records across two distinct monitored PRs, not 171 independent PRs. First failure time: 2026-09-24 03:27:58 UTC (run 15441688). Latest: 2026-09-27 22:34:01 UTC (run 15482109).

Impact and investigation

The error blocks mac-test-package.zip and numerous simulator test builds before NUnit runs. #26683's failed-variation binlogs and #26695's Azure task log show the exact same resource names and linker codes. #26695 also has separate Xamarin.MacDev.csproj .NET 10.0.13 restore failures in other jobs; those NU1102/NU1103 failures are not counted here.

Separate searches across all open and closed dotnet/macios issues for the signature, exact F# resource names, IL2040, NETSDK1144, monotouch-test, Package macOS tests, and ILLink.Substitutions.xml found no matching root. Inspected candidates included #26017 (IL2036 unresolved type), #26390 (IL2015 enum substitution), and #14257 (different assembly/resource behavior). No existing canonical issue or verified workaround was found. Identify where the descriptor and assembly diverge, then validate the correction on each affected branch; rerunning a deterministic source failure merely to make CI green is not a workaround. Azure diagnostic artifacts have limited retention.

[dalexsoto]

#26695: 35 more exact fsharplibrary IL2040 failures on two heads

Old head 4fc295ad233069ddec98069c6f2239f858122846, Azure simulator run 15482109, stage/job/task attempt 1:

• T: monotouch_macos / Run tests: 12 BuildFailure configurations, 8 passed. HtmlReport execution IDs: 547,549,553,557,561,563,567,569,571,583,585,589.
• T: monotouch_maccatalyst / Run tests: 22 BuildFailure configurations, 3 passed. HtmlReport execution IDs: 591,593,595,599,601,603,605,607,611,613,615,617,619,621,623,625,637,639,641,643,645,647.

Every one of those 34 failed-variation build texts has the same six absent fsharplibrary resources (FSharpSignatureData*, FSharpOptimizationData*, FSharpOptimizationInfo) in ILLink.Substitutions.xml: six IL2040 errors then NETSDK1144. The TestSummary variation names were matched to each execution ID. Some HTML summaries also say their log parser closed early; the raw build text confirms the underlying linker cause. The old parent run remained active while other jobs finished; separate .NET 10.0.13 MacDev NU1102/NU1103 restore failures in that run are not grouped here.

Current head 837a18b460563abb04e7c5cc1aabc1c510f9e9a1, Azure simulator run 15482205 / Build macOS tests / Package macOS tests, stage/job/task attempt 1: task log 2246 repeats the exact six IL2040 resources and NETSDK1144 at 2026-09-27 23:12:08 UTC. Its xamarin-macios-pr and API-diff runs succeeded, but its simulator run was still active; the newer restore-config change has not fixed this F# linker mismatch.

Signature/classification: source-related|monotouch-test._RunILLink|fsharplibrary-six-embedded-resources-missing|IL2040-NETSDK1144 - deterministic source/dependency mismatch before test execution. Totals: 206 confirmed records across two distinct monitored PRs, up from 171; these 35 new run/job/configuration records all belong to #26695, not a third PR. These are initial automatically triggered runs, not accepted retry requests. The monitor made no source edit or retry; no verified workaround exists. Additional info to collect: The refreshed issue body requests none for each of the 35 occurrences; no items are unavailable or not permitted. Sources: the two old-head TestSummary/HtmlReport artifacts and current-head Azure task log 2246 (run artifacts); artifacts have limited retention.

[dalexsoto]

#26695: 54 more exact fsharplibrary linker failures across two heads

#26695 produced the following new failures since this issue's last update. Superseded head 4fc295ad233069ddec98069c6f2239f858122846 used run 15482109, and current head 837a18b460563abb04e7c5cc1aabc1c510f9e9a1 uses run 15482205:

• old tvOS: run 15482109, T: monotouch_tvos / Run tests, stage/job/task attempt 1; 12 matching BuildFailure configurations, HtmlReport execution IDs 167,169,173,177,179,181,189,193,195,197,209,213.
• current macOS: run 15482205, T: monotouch_macos / Run tests, stage/job/task attempt 1; 10 matching BuildFailure configurations, HtmlReport execution IDs 547,549,553,557,561,563,567,569,571,589.
• current Mac Catalyst: run 15482205, T: monotouch_maccatalyst / Run tests, stage/job/task attempt 1; 22 matching BuildFailure configurations, HtmlReport execution IDs 591,593,595,599,601,603,605,607,611,613,615,617,619,621,623,625,637,639,641,643,645,647.
• current iOS: run 15482205, T: monotouch_ios / Run tests, stage/job/task attempt 1; 10 matching BuildFailure configurations, HtmlReport execution IDs 109,111,115,119,121,123,131,135,137,139.

Each of the 54 variation build texts contains the identical six absent F# embedded-resource names from fsharplibrary's ILLink.Substitutions.xml, six IL2040 diagnostics and NETSDK1144; the TestSummary variation labels were matched to those execution IDs in HtmlReport. The old parent run was canceled at 2026-09-27 23:44:06 UTC after its tvOS job failed. Azure now returns HTTP 204 for that canceled run's final timeline; previously captured failed-job artifacts remain valid, and no result is inferred for its unfinished iOS job. The current-head simulator run is still active. Its separate MacDev restore errors, explicit DBCPU quota failures, audit-index errors, AppSize baselines, and NativeAOT exit-139 crash are not counted as this signature.

Signature/classification: source-related|monotouch-test._RunILLink|fsharplibrary-six-embedded-resources-missing|IL2040-NETSDK1144 - deterministic source/dependency mismatch before test execution. Totals: 260 confirmed occurrences across two distinct monitored PRs, up from 206; these 54 new job/configuration records all belong to #26695, not another PR. No accepted retry request or monitor source change occurred, and no verified workaround exists. Additional info to collect: The refreshed issue body requests none for each of these 54 occurrences; no items are unavailable or not permitted. Sources: Azure task timelines, TestSummary and HtmlReport for each linked job (run artifacts); diagnostic artifacts have limited retention.

[dalexsoto]

#26695: 12 more exact F# linker failures on tvOS

#26695, head 837a18b460563abb04e7c5cc1aabc1c510f9e9a1: Azure simulator run 15482205 / T: monotouch_tvos / Run tests, stage/job/task attempt 1, task log 2576, finished 2026-09-28 00:31:57 UTC. TestSummary has 12 BuildFailure / 13 passed configurations. The raw HtmlReport build text for each failed configuration has the same six missing fsharplibrary resources in ILLink.Substitutions.xml, six IL2040 errors, then NETSDK1144. Exact tvOS execution IDs: 167,169,173,177,179,181,189,193,195,197,209,213 (variation names are in TestSummary-simulator_testsmonotouch_tvos-1 and HtmlReport-simulator_testsmonotouch_tvos-1).

Signature/classification: source-related|monotouch-test._RunILLink|fsharplibrary-six-embedded-resources-missing|IL2040-NETSDK1144 - deterministic source/dependency mismatch before NUnit execution, not the separate test baseline, quota, audit, or crash failures in the same PR. Totals: 272 confirmed records across the same two monitored PRs, up from 260; these are 12 new test-configuration identities on #26695, not a third PR. The current parent simulator run remains active; these are initial automatic CI jobs, not accepted retries. No monitor retry or source edit occurred and no workaround is verified.

Additional info to collect: The refreshed issue body requests none for each of the 12 occurrences; no items are unavailable or not permitted. Azure run artifacts have limited retention.

[dalexsoto]

#26695: exact F# IL2040 descriptor error in Mac Catalyst fat build

#26695, head 837a18b460563abb04e7c5cc1aabc1c510f9e9a1: Azure simulator run 15482205 / T: dotnettests_maccatalyst / Run tests, stage/job/task attempt 1, task log 2650. BuildFatMonoTouchTest(MacCatalyst,"maccatalyst-arm64;maccatalyst-x64") finished failed 2026-09-27 23:34:41 UTC. Its NUnit assertion contains six IL2040 errors removing the same six absent FSharp*.fsharplibrary resources via ILLink.Substitutions.xml, followed by NETSDK1144. The raw failure is in HtmlReport-simulator_testsdotnettests_maccatalyst-1 and the job's TestSummary.

Signature/classification: source-related|BuildFatMonoTouchTest|fsharplibrary-six-embedded-resources-missing|IL2040-NETSDK1144 - source-related descriptor/assembly mismatch, the same underlying root as this issue's monotouch-test._RunILLink occurrences. The older closed #25386 names the fat-build test but does not have this six-resource linker signature; the extra-resource test assertion is separately tracked in #26759. Totals: 273 confirmed failure records across two distinct monitored PRs; this is one newly identified test case, not another PR. Run 15482205 finished failed, with no verified source correction or retry workaround. The monitor submitted no retry and made no bot-branch edit.

Additional info to collect: The refreshed issue body requests none for this occurrence; no requested values are unavailable or not permitted. Azure artifacts have limited retention.

[dalexsoto]

#26695: same F# IL2040 failure after AppSize expectation update

#26695, new head 949eaed2df7c3a2db5e50984c3ba93f9c099f6e3 ([tests] Update expected app size files): Azure simulator run 15482943 / Build macOS tests / Package macOS tests failed at 2026-09-28 02:37:05 UTC, stage/job/task attempt 1, task log 2246. Packaging build-maccatalyst-dotnet-arm64-monotouch-test reached the same six distinct IL2040 errors: fsharplibrary's ILLink.Substitutions.xml tries to remove the same six absent F# embedded resources, followed by NETSDK1144. The task log repeats those six errors in its final summary; it is one new job/task failure, not twelve occurrences. The missing mac-test-package.zip is downstream.

Signature/classification: source-related|monotouch-test._RunILLink|fsharplibrary-six-embedded-resources-missing|IL2040-NETSDK1144 - source-related descriptor/assembly mismatch, not the separate AppSize preserved-API expectation gate. Totals: 274 confirmed records across two distinct monitored PRs. This new head changes 15 AppSize expected files, not the F# descriptor; its separate xamarin-macios-pr and API-diff pipelines succeeded, but the F# linker root demonstrably persists in the simulator run. Its AppSize simulator tests are still active, so no AppSize fix is claimed. No monitor retry, bot-branch source edit, or verified workaround occurred; all-actor accepted-request counts remain uncertified.

Additional info to collect: The refreshed issue body requests none for this new PR/head/run/attempt/job/task occurrence; no requested facts are unavailable or not permitted. Azure task logs have limited retention.

[dalexsoto]

#26695: 46 more exact F# linker BuildFailures on new head

#26695, head 949eaed2df7c3a2db5e50984c3ba93f9c099f6e3: initial Azure simulator run 15482943, Simulator tests stage/job/task attempt 1. TestSummary's 46 BuildFailure / 24 passed configurations were independently matched to their raw HtmlReport build logs:

• Mac Catalyst, 22 configurations: job 73408371-a55e-5ff5-5372-c49d56cfe7c2 / Run tests, task 6461d47d-e6ea-5999-dbbe-6992de98f697, log 2416, finished 2026-09-28T03:14:16.11Z. Variation names (HtmlReport execution IDs): Debug (591), Debug (CoreCLR) (593), Release (CoreCLR, ARM64) (595), Release (CoreCLR, Universal) (599), Release (link sdk) (601), Release (link all) (603), Debug (PrepareAssemblies) (605), Debug (PrepareAssemblies, Trimmable Static Registrar, link sdk) (607), Debug (managed static registrar) (611), Debug (trimmable static registrar) (613), Debug (static registrar) (615), Release (managed static registrar) (617), Release (trimmable static registrar) (619), Release (managed static registrar, all optimizations) (621), Debug (trimmable static registrar, all optimizations) (623), Release (trimmable static registrar, all optimizations) (625), Release (static registrar) (637), Release (static registrar, all optimizations) (639), Debug (interpreter) (641), Release (interpreter) (643), Release (compat inline dlfcn) (645), Release (strict inline dlfcn, link sdk) (647).
• macOS, 12 configurations: job 0564bbc5-6c6b-5cb4-3d05-9ed0b2c86721 / Run tests, task 723ec601-2b3c-5c84-d6d6-e6999dfb9129, log 2429, finished 2026-09-28T03:13:55.8566667Z. Variation names (HtmlReport execution IDs): Release (link sdk) (547), Release (link all) (549), Debug (PrepareAssemblies, Trimmable Static Registrar, link sdk) (553), Debug (managed static registrar) (557), Debug (static registrar) (561), Release (managed static registrar) (563), Release (managed static registrar, all optimizations) (567), Debug (trimmable static registrar, all optimizations) (569), Release (trimmable static registrar, all optimizations) (571), Release (static registrar) (583), Release (static registrar, all optimizations) (585), Release (strict inline dlfcn, link sdk) (589).
• tvOS - simulator, 12 configurations: job 1acdac53-199e-5330-5c52-bf5d9d7be24b / Run tests, task 0b2be5d1-22fb-53d8-8c5b-90713b3b1798, log 2490, finished 2026-09-28T03:26:34.42Z. Variation names (HtmlReport execution IDs): Release (link sdk) (167), Release (link all) (169), Debug (PrepareAssemblies, Trimmable Static Registrar, link sdk) (173), Debug (LinkSdk) (177), Debug (static registrar) (179), Release (all optimizations) (181), Debug (managed static registrar) (189), Release (managed static registrar, all optimizations) (193), Debug (trimmable static registrar, all optimizations) (195), Release (trimmable static registrar, all optimizations) (197), Release (strict inline Class.GetHandle) (209), Release (strict inline dlfcn, link sdk) (213).

Signature/classification: source-related|monotouch-test._RunILLink|fsharplibrary-six-embedded-resources-missing|IL2040-NETSDK1144 — source-related descriptor/assembly mismatch. Every one of these 46 failed configurations has the same six missing FSharp*.fsharplibrary resources in ILLink.Substitutions.xml, six distinct IL2040 diagnostics and NETSDK1144. Each raw build log repeats the errors in its final summary; that does not double the 46 occurrence count. The Build macOS tests packaging failure on this head was reported in the preceding issue comment; this batch is 46 different job/test-configuration identities on the same PR and run. Totals: 320 records across two distinct monitored PRs. The AppSize expected-file commit did not correct this F# descriptor; there is no verified workaround or source fix. An externally started Build macOS tests stage attempt 2 is currently in progress (new job 7052fe35-1431-500d-b066-a8f68f3e4472); its outcome is unknown and is not counted as a new failure or fix. The monitor submitted no retry or bot-branch edit; all-actor retry-request grouping/budgets remain uncertified.

Additional info to collect: The refreshed issue body requests none for each PR/head/run/attempt/job/configuration above; no requested items are unavailable or not permitted. Azure run artifacts have limited retention. Individual variation failure timestamps were not separately extracted; the three job finish times above are the timestamp attribution. No Helix work items apply to these direct Azure test jobs.

[dalexsoto]

#26695: 12 iOS linker variations, a Mac Catalyst fat build and failed external package attempt

#26695, head 949eaed2df7c3a2db5e50984c3ba93f9c099f6e3: Azure simulator run 15482943. Three new failure scopes since the last #26756 update (which already counted the initial package failure and 46 other monotouch configurations):

• iOS T: monotouch_ios / Run tests, job a70ed34c-97c9-5ebb-c5be-8e2604f5ffcc, task 113cecf5-45b6-5477-24c3-52ec12451502, log 2593, stage/job/task attempt 1: TestSummary 12 BuildFailure / 13 passed iOS - simulator variations. Each failed configuration's raw HtmlReport build log has the identical six absent F# resources, six IL2040 and NETSDK1144: Release (link sdk) (109), Release (link all) (111), Debug (PrepareAssemblies, Trimmable Static Registrar, link sdk) (115), Debug (LinkSdk) (119), Debug (static registrar) (121), Release (all optimizations) (123), Debug (managed static registrar) (131), Release (managed static registrar, all optimizations) (135), Debug (trimmable static registrar, all optimizations) (137), Release (trimmable static registrar, all optimizations) (139), Release (strict inline Class.GetHandle) (151), Release (strict inline dlfcn, link sdk) (155). Job finished 2026-09-28 03:41:12 UTC; per-variation failure times were not separately extracted.
• Mac Catalyst T: dotnettests_maccatalyst / Run tests, job 67959b4e-f34b-5667-75bd-2d99b3b69779, task c8f692bc-2c0b-592c-1f0d-1a2812ad5f0b, log 2666, attempt 1: BuildFatMonoTouchTest(MacCatalyst,"maccatalyst-arm64;maccatalyst-x64") failed at 02:47:51 UTC with the same six IL2040 resources and NETSDK1144 (alias signature source-related|BuildFatMonoTouchTest|fsharplibrary-six-embedded-resources-missing|IL2040-NETSDK1144). This is one NUnit case, not six.
• External Build macOS tests stage attempt 2 / Package macOS tests, job 7052fe35-1431-500d-b066-a8f68f3e4472, task a85aed41-284e-5d8a-42c0-a969083d9062, log 2703: the same Mac Catalyst-arm64 package build repeated the six-resource error; task finished 04:00:29 UTC, job and stage finished failed at 04:01:15/04:01:20 UTC. This was not a source fix or a monitor-submitted retry.

Root/classification: source-related|monotouch-test._RunILLink|fsharplibrary-six-embedded-resources-missing|IL2040-NETSDK1144 — source-related fsharplibrary descriptor/assembly mismatch, persisting on the AppSize expected-file head and after the external package reexecution. Build logs repeat the six errors in their final summaries; those duplicate lines are not extra occurrences. Totals: 334 confirmed failure records across the same two distinct monitored PRs (12 iOS variations + one fat-build case + one package attempt). No workaround is verified, no bot-branch source change was authorized, and all-actor accepted-request grouping and retry budgets remain uncertified.

Additional info to collect: The refreshed issue body requests none for each attributed PR/head/run/attempt/job/task/test record; no requested values are unavailable or not permitted. Azure task and HtmlReport artifacts have limited retention; these direct jobs have no Helix work-item link.

[dalexsoto]

#26695 new head: 12 old iOS F# build failures now build; CI still fails separately

#26695, new head b43b1a4bf81d6d6e091adc0ce2fb63a892d65787 includes externally authored F# linker substitution/descriptor changes and an 8.0.32 feed. The previous head 949eaed2df7c3a2db5e50984c3ba93f9c099f6e3 failed Azure simulator run 15482943 on this issue's six missing FSharp*.fsharplibrary resources, IL2040 and NETSDK1144. On its two Build macOS tests attempts, the same Mac Catalyst package target failed; 12 iOS monotouch-test build variations also failed in T: monotouch_ios job a70ed34c-97c9-5ebb-c5be-8e2604f5ffcc (task 113cecf5-45b6-5477-24c3-52ec12451502, HtmlReport execution IDs 109, 111, 115, 119, 121, 123, 131, 135, 137, 139, 151, 155).

On new-head simulator run 15485551, the corresponding 12 iOS build-iOS logs in HtmlReport-simulator_testsmonotouch_ios-1 use those same execution IDs. Each ends Build succeeded. with zero Build FAILED., IL2040 or NETSDK1144 markers. The old and new run's execution IDs and Release/Debug configurations align; the new logs do not print each friendly subvariation name. Paired NUnit test-run XML for these 12 build executions is Skipped, not an exact test-case pass. Separately, new-head Build macOS tests / Package macOS tests succeeded (task log 2246) and published mac-test-package; that task failed with the six-resource signature on both old-head attempts. These are build-phase recovery observations, not new failure occurrences.

Signature/classification: source-related|monotouch-test._RunILLink|fsharplibrary-six-embedded-resources-missing|IL2040-NETSDK1144 — the historical root is source-related F# ILLink substitution/resource mismatch. The canonical issue still has 334 confirmed failure records across 2 distinct monitored PRs; this update adds no failure to those totals. The new-head T: fsharp and T: monotouch_tvos jobs succeeded (the tvOS TestSummary reports 25/25 configurations passed). Mac Catalyst and macOS monotouch jobs each had a separate, already diagnosed network/listener test failure; their previously failing F# build variations were not individually compared in this update. The T: monotouch_ios job and parent run finished failed at 13:13:12 and 13:16:54 UTC because iOS NativeAOT timed out after an NSUrlSession redirect test started (canonical #26221), not because these 12 F# builds failed. Full PR recovery and the separate extra-resource assertion tracked under #26759 are not verified.

The monitor made no source edit or retry on this bot PR; exact all-actor 25-lifetime/10-head accepted-request counts remain uncertified. Additional info to collect: the refreshed issue body has no diagnostic checklist; no requested data is unavailable or not permitted. Per-variation build logs and issue-linked Azure artifacts have limited retention; skipped NUnit placeholders are not counted as passing test cases.

[rolfbjarne]

Should be fixed in the PRs in question.

[dalexsoto]

New PR #26817: exact F# IL2040 packaging recurrence

#26817 / a7673fbfbcdb5330098040a443bb65d5ba8cdd9b: simulator run 15551290 / Build macOS tests / Package macOS tests, definition 21922, log 2246, initial stage/job/task attempt 1. Job 2ad83a99-f770-5ec5-96c6-63e16b4bb697, task 236a4de9-9286-578b-aaec-437fc5ec4d0e; first linker error 2026-10-02T17:25:02.1504610Z. The parent run remains active.

Same source/dependency mismatch: packaging monotouch-test for Debug / net11.0-maccatalyst / maccatalyst-arm64 reaches _RunILLink / ILLink. The embedded ILLink.Substitutions.xml removes the same six absent FSharpSignatureData*, FSharpSignatureInfo, FSharpOptimizationData* and FSharpOptimizationInfo resources; six distinct IL2040 errors are followed by NETSDK1144. The repeated final-summary diagnostics are not additional occurrences. Actual SDK and ILLink package are 11.0.100-rtm.26480.113 / 11.0.0-rtm.26480.113.

Primary artifact proof: mactests-binlogs-15551290-1-1 maps by Azure source GUID to the failed job above. Its exact macios/tests/monotouch-test/dotnet/MacCatalyst/build-2026-10-02-102405.binlog was fingerprinted and analyzed with binlog MCP overview/errors/properties: FAILED, 57.9 s, six named IL2040 diagnostics in _RunILLink / ILLink, NETSDK1144 and a final build-failed event. The earlier maccatalyst-x64 Debug binlog succeeded with no errors; the separate F# library build also succeeded. Those different build scopes do not prove arm64 recovery or test flakiness.

Signature: source-related|monotouch-test._RunILLink|fsharplibrary-six-embedded-resources-missing|IL2040-NETSDK1144. 333 confirmed exact-signature records across 3 distinct monitored PRs. This adds one package-task/configuration occurrence and a third PR. The canonical issue aggregate is 335, including two separately keyed BuildFatMonoTouchTest alias records; they are not folded into the 333 exact-signature total.

Diagnostics/checklist: the refreshed body has no Additional info to collect section. Exact PR/head/run/definition/stage/job/task/attempt/log, first-error time, project/TFM/RID/configuration, SDK/ILLink versions, artifact/job mapping and raw-log/primary-binlog SHA-256 provenance are retained. Unavailable for this occurrence: the upstream descriptor-producing step is not isolated; assembly manifest bytes were not collected. ILLink establishes the named resources are absent. No NUnit failure result or Helix work item applies to this packaging build. Worker/IP/environment details are withheld; remote artifacts are retention-limited.

Keep the issue closed: the close comment says the original PRs were fixed, and their documented scoped recoveries are not invalidated by this new third PR. This is fresh recurrence evidence, not a claim that those original fixes regressed. No repository-wide correction or verified retry workaround is established for #26817.

No monitor retry or bot-branch/source edit. The error is source-related before test execution, not confirmed infrastructure or a genuinely flaky test. All-actor 25-lifetime/10-head accepted-request grouping remains uncertified. This root is separate from #26685 API-baseline SDK-generation failures and #26770 missing .NET 9.0.22 pack restores.

[dalexsoto]

58 additional exact F# IL2040 build configurations

Signature: source-related|monotouch-test._RunILLink|fsharplibrary-six-embedded-resources-missing|IL2040-NETSDK1144. 391 confirmed exact-signature occurrences across 3 distinct monitored PRs; this batch adds 58 previously unprocessed occurrence(s).

• [release/11.0.1xx] Update dependencies from dotnet/dotnet #26817 / a7673fbfbcdb5330098040a443bb65d5ba8cdd9b: run 15551290 / simulator_tests / exact task, definition 21922, stage/job/task attempt 1, log 2453; 12 distinct record(s). Job 0564bbc5-6c6b-5cb4-3d05-9ed0b2c86721, task 723ec601-2b3c-5c84-d6d6-e6999dfb9129.
  HtmlReport execution IDs: 557,553,561,569,549,547,563,567,583,585,589,571.
• [release/11.0.1xx] Update dependencies from dotnet/dotnet #26817 / a7673fbfbcdb5330098040a443bb65d5ba8cdd9b: run 15551290 / simulator_tests / exact task, definition 21922, stage/job/task attempt 1, log 2342; 22 distinct record(s). Job 73408371-a55e-5ff5-5372-c49d56cfe7c2, task 6461d47d-e6ea-5999-dbbe-6992de98f697.
  HtmlReport execution IDs: 591,593,641,611,605,607,615,613,623,645,595,599,643,603,601,617,621,637,639,647,619,625.
• [release/11.0.1xx] Update dependencies from dotnet/dotnet #26817 / a7673fbfbcdb5330098040a443bb65d5ba8cdd9b: run 15551290 / simulator_tests / exact task, definition 21922, stage/job/task attempt 1, log 2539; 12 distinct record(s). Job 1acdac53-199e-5330-5c52-bf5d9d7be24b, task 0b2be5d1-22fb-53d8-8c5b-90713b3b1798.
  HtmlReport execution IDs: 177,189,173,179,195,181,169,167,193,209,213,197.
• [release/11.0.1xx] Update dependencies from dotnet/dotnet #26817 / a7673fbfbcdb5330098040a443bb65d5ba8cdd9b: run 15551290 / simulator_tests / exact task, definition 21922, stage/job/task attempt 1, log 2613; 12 distinct record(s). Job a70ed34c-97c9-5ebb-c5be-8e2604f5ffcc, task 113cecf5-45b6-5477-24c3-52ec12451502.
  HtmlReport execution IDs: 119,131,115,121,137,123,111,109,135,151,155,139.

Diagnosis and collection:
Each of the 12 macOS, 22 Mac Catalyst, 12 tvOS and 12 iOS failed-variation build texts independently contains the same six missing F# resource-removal directives, IL2040 and NETSDK1144. TestSummary variation labels were matched to exact HtmlReport execution IDs. Parser-closed notes in summaries do not replace the raw linker evidence. These are source-related build failures before NUnit execution, not flaky tests. Exact-signature total 391 excludes the two separately keyed BuildFatMonoTouchTest aliases; canonical aggregate is 393.

Superseded-head context: all rows here belong to #26817 head a7673fbfbcdb5330098040a443bb65d5ba8cdd9b. External commits subsequently changed feeds, F# descriptors and expected API files, first to bcf6f66cadf5995eced0f8238d04e313ff7a0084, then 0320a0e449a8f9b98dcb44fd75ae997539a9a9fe. New automatic CI is tracked independently; a changed head or successful package/API sibling is not an exact-case recovery. Keep the canonical issue CLOSED: its original scoped PR recoveries/common expected-baseline closure are not invalidated by these older different-head records.

Issue-specific checklist: the freshly read body has no Additional info to collect section; no requested diagnostic item is pending. Exact per-occurrence PR/head/run/definition/stage/job/task/attempt/log/test or configuration, timestamps where published, artifact/member identities and fingerprints are retained.
Unavailable/not established — per_variation_utc_failure_time: Not separately extracted; the exact task finish time is attributed instead. Attributed scopes: #26817/run 15551290/job 0564bbc5-6c6b-5cb4-3d05-9ed0b2c86721, #26817/run 15551290/job 1acdac53-199e-5330-5c52-bf5d9d7be24b, #26817/run 15551290/job 73408371-a55e-5ff5-5372-c49d56cfe7c2, #26817/run 15551290/job a70ed34c-97c9-5ebb-c5be-8e2604f5ffcc.
Unavailable/not established — descriptor_producer: The upstream descriptor-producing step is not isolated. Attributed scopes: #26817/run 15551290/job 0564bbc5-6c6b-5cb4-3d05-9ed0b2c86721, #26817/run 15551290/job 1acdac53-199e-5330-5c52-bf5d9d7be24b, #26817/run 15551290/job 73408371-a55e-5ff5-5372-c49d56cfe7c2, #26817/run 15551290/job a70ed34c-97c9-5ebb-c5be-8e2604f5ffcc.
Unavailable/not established — helix_work_item: Not applicable: direct Azure DevOps tests. Attributed scopes: #26817/run 15551290/job 0564bbc5-6c6b-5cb4-3d05-9ed0b2c86721, #26817/run 15551290/job 1acdac53-199e-5330-5c52-bf5d9d7be24b, #26817/run 15551290/job 73408371-a55e-5ff5-5372-c49d56cfe7c2, #26817/run 15551290/job a70ed34c-97c9-5ebb-c5be-8e2604f5ffcc.

No worker identifiers, machine addresses, credentials or raw environment blocks are published. No Helix item applies to these direct Azure jobs; diagnostics are retention-limited. No monitor source edit, binding/suppression change, retry or reopening.

[dalexsoto]

Newly verified CI evidence (2026-10-02)

Signature: source-related|monotouch-test._RunILLink|fsharplibrary-six-embedded-resources-missing|IL2040-NETSDK1144. Classification: source-related.

Exact-signature counts: 449 confirmed occurrences / 3 distinct monitored PRs. Canonical aggregate: 451 records / 3 PRs, preserving separate aliases. This batch adds 58 exact failure records.

PR #26817 / run 15552921, head 0320a0e449a8f9b98dcb44fd75ae997539a9a9fe, pipeline xamarin-macios-sim-pr-tests / definition21922, job 0564bbc5-6c6b-5cb4-3d05-9ed0b2c86721, task 723ec601-2b3c-5c84-d6d6-e6999dfb9129, stage/job/task 1/1/1, log 2656. 12 new test/configuration records: monotouch-test/macos/Debug (PrepareAssemblies, Trimmable Static Registrar, link sdk) (BuildFailure)/execution-553; monotouch-test/macos/Debug (managed static registrar) (BuildFailure)/execution-557; monotouch-test/macos/Debug (static registrar) (BuildFailure)/execution-561; monotouch-test/macos/Debug (trimmable static registrar, all optimizations) (BuildFailure)/execution-569; monotouch-test/macos/Release (link all) (BuildFailure)/execution-549; monotouch-test/macos/Release (link sdk) (BuildFailure)/execution-547; monotouch-test/macos/Release (managed static registrar) (BuildFailure)/execution-563; monotouch-test/macos/Release (managed static registrar, all optimizations) (BuildFailure)/execution-567; monotouch-test/macos/Release (static registrar) (BuildFailure)/execution-583; monotouch-test/macos/Release (static registrar, all optimizations) (BuildFailure)/execution-585; monotouch-test/macos/Release (strict inline dlfcn, link sdk) (BuildFailure)/execution-589; monotouch-test/macos/Release (trimmable static registrar, all optimizations) (BuildFailure)/execution-571.

PR #26817 / run 15552921, head 0320a0e449a8f9b98dcb44fd75ae997539a9a9fe, pipeline xamarin-macios-sim-pr-tests / definition21922, job 1acdac53-199e-5330-5c52-bf5d9d7be24b, task 0b2be5d1-22fb-53d8-8c5b-90713b3b1798, stage/job/task 1/1/1, log 2779. 12 new test/configuration records: monotouch-test/tvos/Debug (LinkSdk) (BuildFailure)/execution-177; monotouch-test/tvos/Debug (PrepareAssemblies, Trimmable Static Registrar, link sdk) (BuildFailure)/execution-173; monotouch-test/tvos/Debug (managed static registrar) (BuildFailure)/execution-189; monotouch-test/tvos/Debug (static registrar) (BuildFailure)/execution-179; monotouch-test/tvos/Debug (trimmable static registrar, all optimizations) (BuildFailure)/execution-195; monotouch-test/tvos/Release (all optimizations) (BuildFailure)/execution-181; monotouch-test/tvos/Release (link all) (BuildFailure)/execution-169; monotouch-test/tvos/Release (link sdk) (BuildFailure)/execution-167; monotouch-test/tvos/Release (managed static registrar, all optimizations) (BuildFailure)/execution-193; monotouch-test/tvos/Release (strict inline Class.GetHandle) (BuildFailure)/execution-209; monotouch-test/tvos/Release (strict inline dlfcn, link sdk) (BuildFailure)/execution-213; monotouch-test/tvos/Release (trimmable static registrar, all optimizations) (BuildFailure)/execution-197.

PR #26817 / run 15552921, head 0320a0e449a8f9b98dcb44fd75ae997539a9a9fe, pipeline xamarin-macios-sim-pr-tests / definition21922, job 73408371-a55e-5ff5-5372-c49d56cfe7c2, task 6461d47d-e6ea-5999-dbbe-6992de98f697, stage/job/task 1/1/1, log 2669. 22 new test/configuration records: monotouch-test/maccatalyst/Debug (BuildFailure)/execution-591; monotouch-test/maccatalyst/Debug (CoreCLR) (BuildFailure)/execution-593; monotouch-test/maccatalyst/Debug (PrepareAssemblies) (BuildFailure)/execution-605; monotouch-test/maccatalyst/Debug (PrepareAssemblies, Trimmable Static Registrar, link sdk) (BuildFailure)/execution-607; monotouch-test/maccatalyst/Debug (interpreter) (BuildFailure)/execution-641; monotouch-test/maccatalyst/Debug (managed static registrar) (BuildFailure)/execution-611; monotouch-test/maccatalyst/Debug (static registrar) (BuildFailure)/execution-615; monotouch-test/maccatalyst/Debug (trimmable static registrar) (BuildFailure)/execution-613; monotouch-test/maccatalyst/Debug (trimmable static registrar, all optimizations) (BuildFailure)/execution-623; monotouch-test/maccatalyst/Release (CoreCLR, ARM64) (BuildFailure)/execution-595; monotouch-test/maccatalyst/Release (CoreCLR, Universal) (BuildFailure)/execution-599; monotouch-test/maccatalyst/Release (compat inline dlfcn) (BuildFailure)/execution-645; monotouch-test/maccatalyst/Release (interpreter) (BuildFailure)/execution-643; monotouch-test/maccatalyst/Release (link all) (BuildFailure)/execution-603; monotouch-test/maccatalyst/Release (link sdk) (BuildFailure)/execution-601; monotouch-test/maccatalyst/Release (managed static registrar) (BuildFailure)/execution-617; monotouch-test/maccatalyst/Release (managed static registrar, all optimizations) (BuildFailure)/execution-621; monotouch-test/maccatalyst/Release (static registrar) (BuildFailure)/execution-637; monotouch-test/maccatalyst/Release (static registrar, all optimizations) (BuildFailure)/execution-639; monotouch-test/maccatalyst/Release (strict inline dlfcn, link sdk) (BuildFailure)/execution-647; monotouch-test/maccatalyst/Release (trimmable static registrar) (BuildFailure)/execution-619; monotouch-test/maccatalyst/Release (trimmable static registrar, all optimizations) (BuildFailure)/execution-625.

PR #26817 / run 15552921, head 0320a0e449a8f9b98dcb44fd75ae997539a9a9fe, pipeline xamarin-macios-sim-pr-tests / definition21922, job a70ed34c-97c9-5ebb-c5be-8e2604f5ffcc, task 113cecf5-45b6-5477-24c3-52ec12451502, stage/job/task 1/1/1, log 2853. 12 new test/configuration records: monotouch-test/ios/Debug (LinkSdk) (BuildFailure)/execution-119; monotouch-test/ios/Debug (PrepareAssemblies, Trimmable Static Registrar, link sdk) (BuildFailure)/execution-115; monotouch-test/ios/Debug (managed static registrar) (BuildFailure)/execution-131; monotouch-test/ios/Debug (static registrar) (BuildFailure)/execution-121; monotouch-test/ios/Debug (trimmable static registrar, all optimizations) (BuildFailure)/execution-137; monotouch-test/ios/Release (all optimizations) (BuildFailure)/execution-123; monotouch-test/ios/Release (link all) (BuildFailure)/execution-111; monotouch-test/ios/Release (link sdk) (BuildFailure)/execution-109; monotouch-test/ios/Release (managed static registrar, all optimizations) (BuildFailure)/execution-135; monotouch-test/ios/Release (strict inline Class.GetHandle) (BuildFailure)/execution-151; monotouch-test/ios/Release (strict inline dlfcn, link sdk) (BuildFailure)/execution-155; monotouch-test/ios/Release (trimmable static registrar, all optimizations) (BuildFailure)/execution-139.

All 58 configurations independently reproduce six missing FSharp resources: IL2040 then NETSDK1144 (iOS 12, tvOS 12, macOS 12, MacCatalyst 22). Representative published primary binlog confirms _RunILLink/ILLink, Debug/net11.0-maccatalyst, SDK 11.0.100-rtm.26480.113 and linker 11.0.0-rtm.26480.113. Log-parser errors are cascades. Keep CLOSED: prior closure covered scoped original-PR fixes, not this different SDK head. Current run failed; earlier/superseded runs canceled, with current timeline unavailable, not proof of recovery. Descriptor producer/assembly-manifest origin remains unisolated.

Issue-specific checklist: fresh body has no Additional info to collect section. Every included occurrence has its own source-member/hash and exact attribution retained. Unavailable diagnostic facts are stated above; worker identifiers and machine/peer addresses are withheld without independent publication permission. No Helix work items apply to these direct Azure jobs.

Retry/fix outcome: no monitor-triggered retry, source change, suppression, commit/push or reopening. All-actor accepted-request grouping and full lifetime/head counters remain uncertified; attempts are not accepted-request counts and successes do not reset budgets. Source/deterministic/unresolved failures are not retried. Azure artifacts/logs are retention-limited.

Artifacts.