cmd/compile: TestScript/embedbad failures on openbsd/ppc64

[gopherbot]

#!watchflakes
default <- pkg == "cmd/compile" && test == "TestScript/embedbad"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestScript/embedbad
=== PAUSE TestScript/embedbad
=== CONT  TestScript/embedbad
    run.go:223: 2025-06-14T14:41:27Z
    run.go:225: $WORK=/home/swarming/.swarming/w/ir/x/t/TestScriptembedbad2679540947/001
    run.go:232: 
        BOTO_CONFIG=/home/swarming/.swarming/w/ir/x/a/gsutil-bbagent/.boto
        CIPD_ARCHITECTURE=ppc64
        CIPD_CACHE_DIR=/home/swarming/.swarming/w/ir/cache/cipd_cache
        CIPD_PROTOCOL=v2
...
        [stderr]
        unicode/utf8: /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: fork/exec /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: resource temporarily unavailable
        cmp: /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: fork/exec /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: resource temporarily unavailable
        math/bits: /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: fork/exec /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: resource temporarily unavailable
        internal/itoa: /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: fork/exec /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: resource temporarily unavailable
        sync/atomic: /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/asm: fork/exec /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/asm: resource temporarily unavailable
        [exit status 1]
        > stderr 'multiple files for type string'
    run.go:232: FAIL: testdata/script/embedbad.txt:4: stderr 'multiple files for type string': no match for `(?m)multiple files for type string` in stderr
--- FAIL: TestScript/embedbad (21.39s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/compile" && test == "TestScript/embedbad"

2025-06-09 17:32 go1.25-openbsd-ppc64 release-branch.go1.25@ac168675 cmd/compile.TestScript/embedbad (log)

=== RUN   TestScript/embedbad
=== PAUSE TestScript/embedbad
=== CONT  TestScript/embedbad
    run.go:223: 2025-06-14T14:41:27Z
    run.go:225: $WORK=/home/swarming/.swarming/w/ir/x/t/TestScriptembedbad2679540947/001
    run.go:232: 
        BOTO_CONFIG=/home/swarming/.swarming/w/ir/x/a/gsutil-bbagent/.boto
        CIPD_ARCHITECTURE=ppc64
        CIPD_CACHE_DIR=/home/swarming/.swarming/w/ir/cache/cipd_cache
        CIPD_PROTOCOL=v2
...
        [stderr]
        unicode/utf8: /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: fork/exec /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: resource temporarily unavailable
        cmp: /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: fork/exec /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: resource temporarily unavailable
        math/bits: /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: fork/exec /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: resource temporarily unavailable
        internal/itoa: /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: fork/exec /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/compile: resource temporarily unavailable
        sync/atomic: /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/asm: fork/exec /home/swarming/.swarming/w/ir/x/t/TestScript2402527903/001/testgoroot/pkg/tool/openbsd_ppc64/asm: resource temporarily unavailable
        [exit status 1]
        > stderr 'multiple files for type string'
    run.go:232: FAIL: testdata/script/embedbad.txt:4: stderr 'multiple files for type string': no match for `(?m)multiple files for type string` in stderr
--- FAIL: TestScript/embedbad (21.39s)

— watchflakes

[mknyszek]

CC @golang/openbsd

[mknyszek]

Possibly related to some of the other recent failures, like #74173.

[cherrymui]

Dup of #74187