cmd/go: TestScript/test_match_only_subtests_parallel failures

[gopherbot]

#!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/test_match_only_subtests_parallel"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestScript/test_match_only_subtests_parallel
=== PAUSE TestScript/test_match_only_subtests_parallel
=== CONT  TestScript/test_match_only_subtests_parallel
    script_test.go:139: 2026-02-07T05:35:35Z
    script_test.go:141: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-2077113309/tmpdir1100691795/test_match_only_subtests_parallel250482860
go proxy: open /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/testdata/mod/golang.org_toolchain_v0.0.1-go1.21.darwin-arm64.txt: no such file or directory
go proxy: no archive golang.org/toolchain v0.0.1-go1.21.darwin-arm64: file does not exist
go proxy: open /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/testdata/mod/golang.org_toolchain_v0.0.1-go1.20.darwin-arm64.txt: no such file or directory
go proxy: no archive golang.org/toolchain v0.0.1-go1.20.darwin-arm64: file does not exist
go proxy: no archive golang.org/toolchain v0.0.1-go1.20.darwin-arm64: file does not exist
...
        r26     0x7a00
        r27     0x104158000
        r28     0x10417e020
        r29     0x16cf6abd0
        lr      0x190458894
        sp      0x16cf6ab40
        pc      0x19041a6ec
        fault   0x19041a6ec
    script_test.go:163: FAIL: testdata/script/test_match_only_subtests_parallel.txt:2: go test -run Test/Sub/Nested standalone_parallel_sub_test.go: exit status 2
--- FAIL: TestScript/test_match_only_subtests_parallel (926.34s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/test_match_only_subtests_parallel"

2026-02-06 17:36 gotip-darwin-arm64-race go@a72a4295 cmd/go.TestScript/test_match_only_subtests_parallel (log)

=== RUN   TestScript/test_match_only_subtests_parallel
=== PAUSE TestScript/test_match_only_subtests_parallel
=== CONT  TestScript/test_match_only_subtests_parallel
    script_test.go:139: 2026-02-07T05:35:35Z
    script_test.go:141: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-2077113309/tmpdir1100691795/test_match_only_subtests_parallel250482860
go proxy: open /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/testdata/mod/golang.org_toolchain_v0.0.1-go1.21.darwin-arm64.txt: no such file or directory
go proxy: no archive golang.org/toolchain v0.0.1-go1.21.darwin-arm64: file does not exist
go proxy: open /Users/swarming/.swarming/w/ir/x/w/goroot/src/cmd/go/testdata/mod/golang.org_toolchain_v0.0.1-go1.20.darwin-arm64.txt: no such file or directory
go proxy: no archive golang.org/toolchain v0.0.1-go1.20.darwin-arm64: file does not exist
go proxy: no archive golang.org/toolchain v0.0.1-go1.20.darwin-arm64: file does not exist
...
        r26     0x7a00
        r27     0x104158000
        r28     0x10417e020
        r29     0x16cf6abd0
        lr      0x190458894
        sp      0x16cf6ab40
        pc      0x19041a6ec
        fault   0x19041a6ec
    script_test.go:163: FAIL: testdata/script/test_match_only_subtests_parallel.txt:2: go test -run Test/Sub/Nested standalone_parallel_sub_test.go: exit status 2
--- FAIL: TestScript/test_match_only_subtests_parallel (926.34s)

— watchflakes

[prattmic]

What makes you say this looks like memory corruption? The test ran for >900s and then got a SIGQUIT. That sounds like a timeout.

[adonovan]

What makes you say this looks like memory corruption? The test ran for >900s and then got a SIGQUIT. That sounds like a timeout.

I agree. Not sure what I was thinking; sorry for the noise.