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cmd/internal/fuzztest: TestScript/test_fuzz_mutator_repeat failures #76902

Description

@gopherbot
#!watchflakes
default <- pkg == "cmd/internal/fuzztest" && test == "TestScript/test_fuzz_mutator_repeat"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestScript/test_fuzz_mutator_repeat
=== PAUSE TestScript/test_fuzz_mutator_repeat
=== CONT  TestScript/test_fuzz_mutator_repeat
    run.go:226: 2025-12-15T22:33:39Z
    run.go:228: $WORK=/home/swarming/.swarming/w/ir/x/t/TestScripttest_fuzz_mutator_repeat3388832620/001
    run.go:235: 
        BOTO_CONFIG=/home/swarming/.swarming/w/ir/x/a/gsutil-bbagent/.boto
        CIPD_ARCHITECTURE=amd64
        CIPD_CACHE_DIR=/home/swarming/.swarming/w/ir/cache/cipd_cache
        CIPD_PROTOCOL=v2
...
        --- FAIL: FuzzRepeat (0.64s)
            fuzzing process hung or terminated unexpectedly while minimizing: EOF
            Failing input written to testdata/fuzz/FuzzRepeat/a159de1ce5e738a7
            To re-run:
            go test -run=FuzzRepeat/a159de1ce5e738a7
        === NAME  
        FAIL
        exit status 1
        FAIL	fuzz	0.776s
        [exit status 1]
        > stdout '^\s+fuzzing process hung or terminated unexpectedly: exit status'
    run.go:235: FAIL: testdata/script/test_fuzz_mutator_repeat.txt:16: stdout '^\s+fuzzing process hung or terminated unexpectedly: exit status': no match for `(?m)^\s+fuzzing process hung or terminated unexpectedly: exit status` in stdout
--- FAIL: TestScript/test_fuzz_mutator_repeat (101.78s)

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