Mac mac_unopt is flaky

Several infra timeouts in the last 100:

https://ci.chromium.org/ui/p/flutter/builders/luci.flutter.prod/Mac%20mac_unopt?limit=100

This task takes 46+ minutes and has an outsized impact on tree closure. Marked as supressed.

Recent failures:

https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20Production%20Engine%20Drone/964188/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20Production%20Engine%20Drone/964342/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20Production%20Engine%20Drone/964783/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20Production%20Engine%20Drone/963311/overview

Infra error mounting the iOS simulator runtime:
https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8683177437043962081/+/u/install_runtimes__2_/verify_and_mount_runtime_ios-26-2_17c52/stdout

D: 6D54DD6C-A8B6-4867-AE00-CD196B8F706A iOS (26.2 - 23C54) (Unusable - Other Failure: Error Domain=SimDiskImageErrorDomain Code=5 "Duplicate of F453DC3A-213C-448A-B827-ED9CDB77D825" UserInfo={NSLocalizedDescription=Duplicate of F453DC3A-213C-448A-B827-ED9CDB77D825, unusableErrorDetail=})

Likely many are timeouts from the Xcode 26 install cache propagating.

Confusingly, the actually failing test here https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20Production%20Engine%20Drone/967460/infra
is showing up as an infra failure because it's trying to run again (to deflake?) and the second run hits the 1hr timeout.

Failure is:

00:00 �[32m+1�[0m�[31m -1�[0m: reorder uniforms �[1m�[31m[E]�[0m�[0m

  ext.ui.window.reinitializeShader: (-32000) Server error
  Asset 'test_reorder_uniforms_1777667370155.frag.iplr' not found
  #0      FragmentProgram._reinitializeShader (dart:ui/painting.dart:5487:7)
  #1      _reinitializeShader (dart:ui/natives.dart:66:21)
  #2      _RootZone.runBinary (dart:async/zone.dart:967:54)
  #3      _RootZone.bindBinaryCallback.<anonymous closure> (dart:async/zone.dart:923:33)
  #4      _runExtension (dart:developer-patch/developer.dart:113:23)


  package:vm_service/src/vm_service.dart 278:34                  new _OutstandingRequest
  package:vm_service/src/vm_service.dart 1960:25                 VmService._call.<fn>
  package:vm_service/src/vm_service.dart 1972:8                  VmService._call
  package:vm_service/src/vm_service.dart 1911:14                 VmService.callServiceExtension
  flutter/testing/dart/vm_service/shader_reload_test.dart 33:53  _performReload
  ===== asynchronous gap ===========================
  flutter/testing/dart/vm_service/shader_reload_test.dart 88:7   main.<fn>
  ===== asynchronous gap ===========================
  package:test_api/src/backend/declarer.dart 253:15              Declarer.test.<fn>.<fn>
  ===== asynchronous gap ===========================
  package:test_api/src/backend/declarer.dart 250:11              Declarer.test.<fn>
  ===== asynchronous gap ===========================
  package:test_api/src/backend/invoker.dart 318:9                Invoker._waitForOutstandingCallbacks.<fn>

https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8682975853707086849/+/u/test:_Host_Tests_for_host_debug_unopt_arm64/stdout

This one is mounting a git cache for 32 minutes?
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20Production%20Engine%20Drone/963311/overview

#185767

Thanks for the detailed report. Labeling and routing to team-infra for further investigation.

The fyi-infra label is redundant with the team-infra label.

Still flakey: https://ci.chromium.org/ui/p/flutter/builders/luci.flutter.prod/Mac%20mac_unopt

Run the mac_unopt sub-builds as standalone builders (flutter#195868)

Split mac_host_{debug,profile,release}_arm64_tests into one step per …

This issue is marked P1 but has had no recent status updates.

The P1 label indicates high-priority issues that are at the top of the work list. This is the highest priority level a bug can have if it isn't affecting a top-tier customer or breaking the build. Bugs marked P1 are generally actively being worked on unless the assignee is dealing with a P0 bug (or another P1 bug). Issues at this level should be resolved in a matter of months and should have monthly updates on GitHub.

Please consider where this bug really falls in our current priorities, and label it or assign it accordingly. This allows people to have a clearer picture of what work is actually planned. Thanks!

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Mac mac_unopt is flaky #185908

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Mac mac_unopt is flaky #185908

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jtmcdole commented on May 1, 2026

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jtmcdole commented on Jul 6, 2026

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