cmd/internal/testdir:5_10: Test/fixedbugs/issue21576.go failures

[gopherbot]

#!watchflakes
default <- pkg == "cmd/internal/testdir:5_10" && test == "Test/fixedbugs/issue21576.go"

Issue created automatically to collect these failures.

Example (log):

=== RUN   Test/fixedbugs/issue21576.go
=== PAUSE Test/fixedbugs/issue21576.go
=== CONT  Test/fixedbugs/issue21576.go
    testdir_test.go:147: exit status 1
        2025/12/05 01:31:27 Unmatched error message "fatal error: all goroutines are asleep - deadlock!":
        in
        
        Error: signal: killed
        
--- FAIL: Test/fixedbugs/issue21576.go (61.54s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/internal/testdir:5_10" && test == "Test/fixedbugs/issue21576.go"

2025-12-04 17:53 go1.26-netbsd-arm64 release-branch.go1.26@c43c1559 cmd/internal/testdir:5_10.Test/fixedbugs/issue21576.go (log)

=== RUN   Test/fixedbugs/issue21576.go
=== PAUSE Test/fixedbugs/issue21576.go
=== CONT  Test/fixedbugs/issue21576.go
    testdir_test.go:147: exit status 1
        2025/12/05 01:31:27 Unmatched error message "fatal error: all goroutines are asleep - deadlock!":
        in
        
        Error: signal: killed
        
--- FAIL: Test/fixedbugs/issue21576.go (61.54s)

— watchflakes