cmd/go: TestScript/mod_get_newcycle failures

[gopherbot]

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

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestScript/mod_get_newcycle
=== PAUSE TestScript/mod_get_newcycle
=== CONT  TestScript/mod_get_newcycle
    script_test.go:141: 2026-03-28T20:42:42Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1847409744/tmpdir964989583/mod_get_newcycle629713104

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

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

2026-03-28 20:07 gotip-darwin-amd64-race go@d247ed00 cmd/go.TestScript/mod_get_newcycle [SKIP] (log)

=== RUN   TestScript/mod_get_newcycle
=== PAUSE TestScript/mod_get_newcycle
=== CONT  TestScript/mod_get_newcycle
    script_test.go:141: 2026-03-28T20:42:42Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1847409744/tmpdir964989583/mod_get_newcycle629713104

— watchflakes

[JunyangShao]

@golang/command-line

[randall77]

Might also be darwin/amd64 builder memory corruption.

[gopherbot]

Found new dashboard test flakes for:

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

2026-04-23 15:23 gotip-darwin-amd64-race go@b9e1876c cmd/go.TestScript/mod_get_newcycle (log)

=== RUN   TestScript/mod_get_newcycle
=== PAUSE TestScript/mod_get_newcycle
=== CONT  TestScript/mod_get_newcycle
    script_test.go:141: 2026-04-24T02:44:30Z
    script_test.go:143: $WORK=/Volumes/Work/s/w/ir/x/t/cmd-go-test-3754121525/tmpdir3680450017/mod_get_newcycle675509128
    script_test.go:165: 
        PATH=/Volumes/Work/s/w/ir/x/t/cmd-go-test-3754121525/tmpdir3680450017/testbin:/Volumes/Work/s/w/ir/x/w/goroot/bin:/Volumes/Work/s/w/ir/x/w/goroot/bin:/Volumes/Work/s/w/ir/x/w/goroot/bin:/Volumes/Work/s/w/ir/cache/tools/bin:/Volumes/Work/s/w/ir/bbagent_utility_packages:/Volumes/Work/s/w/ir/bbagent_utility_packages/bin:/Volumes/Work/s/w/ir/cipd_bin_packages:/Volumes/Work/s/w/ir/cipd_bin_packages/bin:/Volumes/Work/s/w/ir/cache/cipd_client:/Volumes/Work/s/w/ir/cache/cipd_client/bin:/Volumes/Work/s/cipd_cache/bin:/opt/infra-tools:/opt/local/bin:/opt/local/sbin:/usr/local/sbin:/usr/local/git/bin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=amd64
...
        GOPATH=/Volumes/Work/s/w/ir/x/t/cmd-go-test-3754121525/tmpdir3680450017/mod_get_newcycle675509128/gopath
        PWD=/Volumes/Work/s/w/ir/x/t/cmd-go-test-3754121525/tmpdir3680450017/mod_get_newcycle675509128/gopath/src
        
        > env GO111MODULE=on
        # Download modules to avoid stderr chatter (2.663s)
        > go mod download example.com@v1.0.0
        > go mod download example.com/newcycle/a@v1.0.0
        > go mod download example.com/newcycle/a@v1.0.1
    script_test.go:165: FAIL: testdata/script/mod_get_newcycle.txt:6: go mod download example.com/newcycle/a@v1.0.1: signal: segmentation fault
--- FAIL: TestScript/mod_get_newcycle (2.69s)

2026-04-29 20:01 go1.26-darwin-arm64-race release-branch.go1.26@f43caf87 cmd/go.TestScript/mod_get_newcycle (log)

=== RUN   TestScript/mod_get_newcycle
=== PAUSE TestScript/mod_get_newcycle
=== CONT  TestScript/mod_get_newcycle
    script_test.go:139: 2026-04-30T10:59:22Z
    script_test.go:141: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-3904061431/tmpdir3426298105/mod_get_newcycle3171323057
go proxy: no archive rsc.io v1.0.0: file does not exist
    script_test.go:163: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-3904061431/tmpdir3426298105/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
...
        GOPATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-3904061431/tmpdir3426298105/mod_get_newcycle3171323057/gopath
        PWD=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-3904061431/tmpdir3426298105/mod_get_newcycle3171323057/gopath/src
        
        > env GO111MODULE=on
        # Download modules to avoid stderr chatter (2.265s)
        > go mod download example.com@v1.0.0
        > go mod download example.com/newcycle/a@v1.0.0
        > go mod download example.com/newcycle/a@v1.0.1
    script_test.go:163: FAIL: testdata/script/mod_get_newcycle.txt:6: go mod download example.com/newcycle/a@v1.0.1: signal: segmentation fault
--- FAIL: TestScript/mod_get_newcycle (2.28s)

— watchflakes