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cmd/go: data race in TestScript/cover involving BuildActionID and tryCacheWithID #81327

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cmd/go: data race in TestScript/cover involving BuildActionID and tryCacheWithID#81327
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AutomationIssues created by gopherbot or watchflakes automation.GoCommandcmd/goNeedsInvestigationSomeone must examine and confirm this is a valid issue and not a duplicate of an existing one.
Milestone
Go1.28

Description

@gopherbot
gopherbot
opened on Sep 3, 2026
#!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/cover" && `DATA RACE` && `BuildActionID` && `tryCacheWithID`

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestScript/cover_runs
=== PAUSE TestScript/cover_runs
=== CONT  TestScript/cover_runs
    script_test.go:141: 2026-09-01T19:58:46Z
    script_test.go:143: $WORK=/home/swarming/.swarming/w/ir/x/t/cmd-go-test-1916328380/tmpdir2420726591/cover_runs2567333553
    script_test.go:165: 
        PATH=/home/swarming/.swarming/w/ir/x/t/cmd-go-test-1916328380/tmpdir2420726591/testbin:/home/swarming/.swarming/w/ir/x/w/goroot/bin:/home/swarming/.swarming/w/ir/x/w/goroot/bin:/home/swarming/.swarming/w/ir/x/w/goroot/bin:/home/swarming/.swarming/w/ir/cache/tools/bin:/home/swarming/.swarming/w/ir/bbagent_utility_packages:/home/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/home/swarming/.swarming/w/ir/cipd_bin_packages:/home/swarming/.swarming/w/ir/cipd_bin_packages/bin:/home/swarming/.swarming/w/ir/cache/cipd_client:/home/swarming/.swarming/w/ir/cache/cipd_client/bin:/home/swarming/.swarming/cipd_cache/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=ppc64
...
        matched: ok  	regexp	0.826s	coverage: 17.8% of statements in strings
        > go test -short -cover strings math regexp
        [stdout]
        ok  	strings	0.164s	coverage: 96.6% of statements
        ok  	math	0.034s	coverage: 87.9% of statements
        signal: killed
        FAIL	regexp	2.763s
        FAIL
    script_test.go:165: FAIL: testdata/script/cover_runs.txt:8: go test -short -cover strings math regexp: exit status 1
--- FAIL: TestScript/cover_runs (30.69s)

— watchflakes

Activity

  1. gopherbot commented on Sep 3, 2026

    @gopherbot
    gopherbot
    on Sep 3, 2026
    ContributorAuthor

    Found new dashboard test flakes for:

    #!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/cover_runs"
    2026-09-01 19:31 gotip-linux-ppc64_power10 go@23761e7b cmd/go.TestScript/cover_runs (log) 
    === RUN   TestScript/cover_runs
=== PAUSE TestScript/cover_runs
=== CONT  TestScript/cover_runs
    script_test.go:141: 2026-09-01T19:58:46Z
    script_test.go:143: $WORK=/home/swarming/.swarming/w/ir/x/t/cmd-go-test-1916328380/tmpdir2420726591/cover_runs2567333553
    script_test.go:165: 
        PATH=/home/swarming/.swarming/w/ir/x/t/cmd-go-test-1916328380/tmpdir2420726591/testbin:/home/swarming/.swarming/w/ir/x/w/goroot/bin:/home/swarming/.swarming/w/ir/x/w/goroot/bin:/home/swarming/.swarming/w/ir/x/w/goroot/bin:/home/swarming/.swarming/w/ir/cache/tools/bin:/home/swarming/.swarming/w/ir/bbagent_utility_packages:/home/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/home/swarming/.swarming/w/ir/cipd_bin_packages:/home/swarming/.swarming/w/ir/cipd_bin_packages/bin:/home/swarming/.swarming/w/ir/cache/cipd_client:/home/swarming/.swarming/w/ir/cache/cipd_client/bin:/home/swarming/.swarming/cipd_cache/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=ppc64
...
        matched: ok  	regexp	0.826s	coverage: 17.8% of statements in strings
        > go test -short -cover strings math regexp
        [stdout]
        ok  	strings	0.164s	coverage: 96.6% of statements
        ok  	math	0.034s	coverage: 87.9% of statements
        signal: killed
        FAIL	regexp	2.763s
        FAIL
    script_test.go:165: FAIL: testdata/script/cover_runs.txt:8: go test -short -cover strings math regexp: exit status 1
--- FAIL: TestScript/cover_runs (30.69s)

    — watchflakes

  2. gopherbot
    added
    AutomationIssues created by gopherbot or watchflakes automation.
    on Sep 3, 2026
  3. gopherbot
    added this to Test Flakeson Sep 3, 2026
  4. prattmic
    closed this as a duplicateof x/build: gotip-linux-ppc64_power10 OOM failing #81357 on Sep 4, 2026
  5. github-project-automation
    moved this to Done in Test Flakeson Sep 4, 2026
  6. gopherbot
    reopened this on Sep 14, 2026

  7. gopherbot commented on Sep 14, 2026

    @gopherbot
    gopherbot
    on Sep 14, 2026
    ContributorAuthor

    Found new dashboard test flakes for:

    #!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/cover_runs"
    2026-09-13 17:46 gotip-darwin-amd64-race go@bddf824b cmd/go.TestScript/cover_runs (log) 
    === RUN   TestScript/cover_runs
=== PAUSE TestScript/cover_runs
=== CONT  TestScript/cover_runs
    script_test.go:141: 2026-09-13T18:23:00Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1822662496/tmpdir652003150/cover_runs2339385440
    script_test.go:165: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1822662496/tmpdir652003150/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=amd64
...
          cmd/go.Main()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/export_test.go:7 +0x2274
          cmd/go_test.TestMain()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/go_test.go:156 +0x226f
          main.main()
              _testmain.go:168 +0x171
        ==================
        Found 1 data race(s)
    script_test.go:165: FAIL: testdata/script/cover_runs.txt:3: go test -short -coverpkg=strings strings regexp: exit status 66
--- FAIL: TestScript/cover_runs (61.28s)

    — watchflakes

  8. github-project-automation
    moved this from Done to Active in Test Flakeson Sep 14, 2026

  9. gopherbot commented on Sep 14, 2026

    @gopherbot
    gopherbot
    on Sep 14, 2026
    ContributorAuthor

    Found new dashboard test flakes for:

    #!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/cover_runs"
    2026-09-14 16:51 gotip-darwin-arm64-race go@116291c8 cmd/go.TestScript/cover_runs (log) 
    === RUN   TestScript/cover_runs
=== PAUSE TestScript/cover_runs
=== CONT  TestScript/cover_runs
    script_test.go:141: 2026-09-14T17:24:01Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-269649006/tmpdir3193761606/cover_runs4213674145
    script_test.go:165: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-269649006/tmpdir3193761606/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=arm64
...
          cmd/go.Main()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/export_test.go:7 +0x1af0
          cmd/go_test.TestMain()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/go_test.go:156 +0x1aec
          main.main()
              _testmain.go:168 +0xf8
        ==================
        Found 1 data race(s)
    script_test.go:165: FAIL: testdata/script/cover_runs.txt:3: go test -short -coverpkg=strings strings regexp: exit status 66
--- FAIL: TestScript/cover_runs (4.94s)

    — watchflakes

  10. cherrymui
    changed the title [-]cmd/go: TestScript/cover_runs failures[/-] [+]cmd/go: data race in TestScript/cover_runs[/+] on Sep 18, 2026
  11. cherrymui
    added
    NeedsInvestigationSomeone must examine and confirm this is a valid issue and not a duplicate of an existing one.
    GoCommandcmd/go
    on Sep 18, 2026
  12. github-project-automation
    added this to Go Compiler / Runtime / Commandon Sep 18, 2026
  13. cherrymui
    added this to the Go1.28 milestone on Sep 18, 2026

  14. gopherbot commented on Sep 18, 2026

    @gopherbot
    gopherbot
    on Sep 18, 2026
    ContributorAuthor

    Found new dashboard test flakes for:

    #!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/cover_runs" && `DATA RACE`
    2026-09-18 20:25 gotip-darwin-arm64-race go@272ef55a cmd/go.TestScript/cover_runs (log) 
    === RUN   TestScript/cover_runs
=== PAUSE TestScript/cover_runs
=== CONT  TestScript/cover_runs
    script_test.go:141: 2026-09-18T21:03:54Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-3003039910/tmpdir1310116494/cover_runs1392791512
    script_test.go:165: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-3003039910/tmpdir1310116494/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=arm64
...
          cmd/go.Main()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/export_test.go:7 +0x1af0
          cmd/go_test.TestMain()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/go_test.go:156 +0x1aec
          main.main()
              _testmain.go:168 +0xf8
        ==================
        Found 1 data race(s)
    script_test.go:165: FAIL: testdata/script/cover_runs.txt:3: go test -short -coverpkg=strings strings regexp: exit status 66
--- FAIL: TestScript/cover_runs (13.51s)

    — watchflakes

  15. 32 remaining items

  16. gopherbot commented on Oct 13, 2026

    @gopherbot
    gopherbot
    on Oct 13, 2026
    ContributorAuthor

    Found new dashboard test flakes for:

    #!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/cover_runs" && `DATA RACE`
    2026-10-13 01:26 gotip-darwin-amd64-race go@d5fbe188 cmd/go.TestScript/cover_runs (log) 
    === RUN   TestScript/cover_runs
=== PAUSE TestScript/cover_runs
=== CONT  TestScript/cover_runs
    script_test.go:141: 2026-10-13T04:07:07Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-2443888485/tmpdir2711121189/cover_runs881659388
    script_test.go:165: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-2443888485/tmpdir2711121189/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=amd64
...
          cmd/go.Main()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/export_test.go:7 +0x2274
          cmd/go_test.TestMain()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/go_test.go:157 +0x226f
          main.main()
              _testmain.go:168 +0x171
        ==================
        Found 1 data race(s)
    script_test.go:165: FAIL: testdata/script/cover_runs.txt:3: go test -short -coverpkg=strings strings regexp: exit status 66
--- FAIL: TestScript/cover_runs (16.19s)

    — watchflakes

  17. gopherbot commented on Oct 14, 2026

    @gopherbot
    gopherbot
    on Oct 14, 2026
    ContributorAuthor

    Found new dashboard test flakes for:

    #!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/cover_runs" && `DATA RACE`
    2026-10-13 17:39 gotip-darwin-arm64-race go@9f0fa360 cmd/go.TestScript/cover_runs (log) 
    === RUN   TestScript/cover_runs
=== PAUSE TestScript/cover_runs
=== CONT  TestScript/cover_runs
    script_test.go:141: 2026-10-13T19:32:06Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-2450221141/tmpdir3229623168/cover_runs3771703342
    script_test.go:165: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-2450221141/tmpdir3229623168/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=arm64
...
          cmd/go.Main()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/export_test.go:7 +0x1af0
          cmd/go_test.TestMain()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/go_test.go:157 +0x1aec
          main.main()
              _testmain.go:168 +0xf8
        ==================
        Found 1 data race(s)
    script_test.go:165: FAIL: testdata/script/cover_runs.txt:3: go test -short -coverpkg=strings strings regexp: exit status 66
--- FAIL: TestScript/cover_runs (4.61s)

    — watchflakes

  18. gopherbot commented on Oct 14, 2026

    @gopherbot
    gopherbot
    on Oct 14, 2026
    ContributorAuthor

    Found new dashboard test flakes for:

    #!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/cover_runs" && `DATA RACE`
    2026-10-13 19:47 gotip-darwin-amd64-race go@26bc19ed cmd/go.TestScript/cover_runs (log) 
    === RUN   TestScript/cover_runs
=== PAUSE TestScript/cover_runs
=== CONT  TestScript/cover_runs
    script_test.go:141: 2026-10-14T05:59:29Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-3939455127/tmpdir2216286308/cover_runs1647933807
    script_test.go:165: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-3939455127/tmpdir2216286308/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=amd64
...
          cmd/go.Main()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/export_test.go:7 +0x2274
          cmd/go_test.TestMain()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/go_test.go:157 +0x226f
          main.main()
              _testmain.go:168 +0x171
        ==================
        Found 1 data race(s)
    script_test.go:165: FAIL: testdata/script/cover_runs.txt:3: go test -short -coverpkg=strings strings regexp: exit status 66
--- FAIL: TestScript/cover_runs (17.01s)

    — watchflakes

  19. gopherbot commented on Oct 14, 2026

    @gopherbot
    gopherbot
    on Oct 14, 2026
    ContributorAuthor

    Found new dashboard test flakes for:

    #!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/cover_runs" && `DATA RACE`
    2026-10-14 00:10 gotip-darwin-arm64-race go@e60b4c37 cmd/go.TestScript/cover_runs (log) 
    === RUN   TestScript/cover_runs
=== PAUSE TestScript/cover_runs
=== CONT  TestScript/cover_runs
    script_test.go:141: 2026-10-14T01:00:23Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-2053015102/tmpdir1503996665/cover_runs2966655431
    script_test.go:165: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-2053015102/tmpdir1503996665/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=arm64
...
          cmd/go.Main()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/export_test.go:7 +0x1af0
          cmd/go_test.TestMain()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/go_test.go:157 +0x1aec
          main.main()
              _testmain.go:168 +0xf8
        ==================
        Found 1 data race(s)
    script_test.go:165: FAIL: testdata/script/cover_runs.txt:3: go test -short -coverpkg=strings strings regexp: exit status 66
--- FAIL: TestScript/cover_runs (6.26s)

    — watchflakes

  20. gopherbot commented on Oct 15, 2026

    @gopherbot
    gopherbot
    on Oct 15, 2026
    ContributorAuthor

    Found new dashboard test flakes for:

    #!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/cover_runs" && `DATA RACE`
    2026-10-14 16:27 gotip-darwin-arm64-race go@a541e84c cmd/go.TestScript/cover_runs (log) 
    === RUN   TestScript/cover_runs
=== PAUSE TestScript/cover_runs
=== CONT  TestScript/cover_runs
    script_test.go:141: 2026-10-14T18:00:44Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1094896345/tmpdir2222423465/cover_runs1958021566
    script_test.go:165: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1094896345/tmpdir2222423465/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=arm64
...
          cmd/go.Main()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/export_test.go:7 +0x1af0
          cmd/go_test.TestMain()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/go_test.go:157 +0x1aec
          main.main()
              _testmain.go:168 +0xf8
        ==================
        Found 1 data race(s)
    script_test.go:165: FAIL: testdata/script/cover_runs.txt:3: go test -short -coverpkg=strings strings regexp: exit status 66
--- FAIL: TestScript/cover_runs (4.44s)
    2026-10-14 19:59 gotip-darwin-arm64-race go@8b3ed8a0 cmd/go.TestScript/cover_runs (log) 
    === RUN   TestScript/cover_runs
=== PAUSE TestScript/cover_runs
=== CONT  TestScript/cover_runs
    script_test.go:141: 2026-10-14T20:41:46Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-4004091887/tmpdir3074790989/cover_runs4123605935
    script_test.go:165: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-4004091887/tmpdir3074790989/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=arm64
...
          cmd/go.Main()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/export_test.go:7 +0x1af0
          cmd/go_test.TestMain()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/go_test.go:157 +0x1aec
          main.main()
              _testmain.go:168 +0xf8
        ==================
        Found 1 data race(s)
    script_test.go:165: FAIL: testdata/script/cover_runs.txt:3: go test -short -coverpkg=strings strings regexp: exit status 66
--- FAIL: TestScript/cover_runs (6.28s)

    — watchflakes

  21. gopherbot commented on Oct 15, 2026

    @gopherbot
    gopherbot
    on Oct 15, 2026
    ContributorAuthor

    Found new dashboard test flakes for:

    #!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/cover_runs" && `DATA RACE`
    2026-10-14 22:04 gotip-darwin-amd64-race go@e629bade cmd/go.TestScript/cover_runs (log) 
    === RUN   TestScript/cover_runs
=== PAUSE TestScript/cover_runs
=== CONT  TestScript/cover_runs
    script_test.go:141: 2026-10-14T22:47:35Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1785266693/tmpdir3952351507/cover_runs1692670467
    script_test.go:165: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1785266693/tmpdir3952351507/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=amd64
...
          cmd/go.Main()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/export_test.go:7 +0x2274
          cmd/go_test.TestMain()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/go_test.go:157 +0x226f
          main.main()
              _testmain.go:168 +0x171
        ==================
        Found 1 data race(s)
    script_test.go:165: FAIL: testdata/script/cover_runs.txt:3: go test -short -coverpkg=strings strings regexp: exit status 66
--- FAIL: TestScript/cover_runs (22.81s)
    2026-10-15 01:04 gotip-darwin-amd64-race go@45c2e356 cmd/go.TestScript/cover_runs (log) 
    === RUN   TestScript/cover_runs
=== PAUSE TestScript/cover_runs
=== CONT  TestScript/cover_runs
    script_test.go:141: 2026-10-15T01:52:00Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1731736030/tmpdir3576001605/cover_runs2682893136
    script_test.go:165: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1731736030/tmpdir3576001605/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=amd64
...
          cmd/go.Main()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/export_test.go:7 +0x2274
          cmd/go_test.TestMain()
              /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/go_test.go:157 +0x226f
          main.main()
              _testmain.go:168 +0x171
        ==================
        Found 1 data race(s)
    script_test.go:165: FAIL: testdata/script/cover_runs.txt:3: go test -short -coverpkg=strings strings regexp: exit status 66
--- FAIL: TestScript/cover_runs (53.55s)

    — watchflakes

  22. gopherbot
    closed this as completedin 0259464on Oct 15, 2026
  23. github-project-automation
    moved this from Todo to Done in Go Compiler / Runtime / Commandon Oct 15, 2026
  24. github-project-automation
    moved this from Active to Done in Test Flakeson Oct 15, 2026
  25. github-actions
    added a commit that references this issue on Oct 15, 2026

    cmd/go: fix data race reading -coverpkg build IDs in test cache

    0259464
  26. thepudds
    marked cmd/go: TestScript/cover_coverpkg_with_init failures #79651 as a duplicate of this issue on Oct 15, 2026
  27. thepudds
    marked cmd/go: data race on Action.buildID between updateBuildID and tryCacheWithID with -coverpkg #81366 as a duplicate of this issue on Oct 15, 2026
  28. thepudds
    changed the title [-]cmd/go: data race in TestScript/cover_runs[/-] [+]cmd/go: data race in TestScript/cover_[/+] on Oct 15, 2026
  29. thepudds
    changed the title [-]cmd/go: data race in TestScript/cover_[/-] [+]cmd/go: data race in TestScript/cover involving BuildActionID and tryCacheWithID[/+] on Oct 15, 2026

  30. thepudds commented on Oct 15, 2026

    @thepudds
    thepudds
    on Oct 15, 2026
    Member

    This is hopefully is resolved with https://go.dev/cl/847669.

    It was also causing 3-4 other watchflakes issues via other TestScript failures. I optimistically closed those issues.

    I also tweaked the watchflakes rule here to focus more directly on this particular data race along with a broader TestScript/cover pattern.

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