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runtime: TestCgoExternalThreadSignal failures #80695

Description

@gopherbot
#!watchflakes
default <- pkg == "runtime" && test == "TestCgoExternalThreadSignal"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestCgoExternalThreadSignal
=== PAUSE TestCgoExternalThreadSignal
=== CONT  TestCgoExternalThreadSignal
    crash_cgo_test.go:186: /home/swarming/.swarming/w/ir/x/t/go-build3969694337/testprogcgo.exe CgoExternalThreadSignal: exit status 1
    crash_cgo_test.go:191: expected "OK\n", but got:
        C signal did not crash as expected
        
        MemorySanitizer:DEADLYSIGNAL
        ==66770==ERROR: MemorySanitizer: SEGV on unknown address 0x000000000000 (pc 0x00000069416d bp 0x7902513e5ef0 sp 0x7902513e5ec0 T66925)
        ==66770==The signal is caused by a WRITE memory access.
        ==66770==Hint: address points to the zero page.
        error: failed to decompress '.debug_info', zlib is not available
        error: failed to decompress '.debug_abbrev', zlib is not available
        error: failed to decompress '.debug_line', zlib is not available
        error: failed to decompress '.debug_frame', zlib is not available
        error: failed to decompress '.debug_str', zlib is not available
        error: failed to decompress '.debug_addr', zlib is not available
        error: failed to decompress '.debug_rnglists', zlib is not available
        error: failed to decompress '.debug_str_offsets', zlib is not available
        error: failed to decompress '.debug_line_str', zlib is not available
        error: failed to decompress '.debug_loclists', zlib is not available
        LLVM ERROR: IO failure on output stream: Broken pipe
        
--- FAIL: TestCgoExternalThreadSignal (5.36s)

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    AutomationIssues created by gopherbot or watchflakes automation.NeedsInvestigationSomeone must examine and confirm this is a valid issue and not a duplicate of an existing one.compiler/runtimeIssues related to the Go compiler and/or runtime.

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