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cmd/go: TestScript/mod_tagged_import_cycle failures #76571

Description

@gopherbot
#!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/mod_tagged_import_cycle"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestScript/mod_tagged_import_cycle
=== PAUSE TestScript/mod_tagged_import_cycle
=== CONT  TestScript/mod_tagged_import_cycle
    script_test.go:139: 2025-11-21T00:22:29Z
    script_test.go:141: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-113378161/tmpdir2697945968/mod_tagged_import_cycle1538132776
    script_test.go:163: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-113378161/tmpdir2697945968/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
...
        PWD=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-113378161/tmpdir2697945968/mod_tagged_import_cycle1538132776/gopath/src
        
        # Because 'go mod' subcommands ignore build constraints, they can encounter
        # package-import cycles that are not possible in an ordinary build. This test
        # verifies that such cycles are handled even when they cross module boundaries.
        # First, verify that the import graph depends on build tags as expected. (0.004s)
        > go list -deps example.com/left
    script_test.go:163: FAIL: testdata/script/mod_tagged_import_cycle.txt:6: go list -deps example.com/left: signal: segmentation fault
    script_test.go:405: go was invoked but no counters were incremented
--- FAIL: TestScript/mod_tagged_import_cycle (0.02s)

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