runtime: TestCgoExternalThreadPanic failures

[gopherbot]

#!watchflakes
post <- pkg == "runtime" && test == "TestCgoExternalThreadPanic" && `context deadline exceeded`

Issue created automatically to collect these failures.

Example (log):

--- FAIL: TestCgoExternalThreadPanic (0.00s)
    crash_test.go:58: /var/gobuilder/buildlet/tmp/go-build2870843524/testprogcgo.exe CgoExternalThreadPanic failed to start: context deadline exceeded

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "runtime" && test == "TestCgoExternalThreadPanic"

2022-12-16 03:40 netbsd-arm64-bsiegert go@24ac659a runtime.TestCgoExternalThreadPanic (log)

--- FAIL: TestCgoExternalThreadPanic (0.00s)
    crash_test.go:58: /var/gobuilder/buildlet/tmp/go-build2870843524/testprogcgo.exe CgoExternalThreadPanic failed to start: context deadline exceeded

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "runtime" && test == "TestCgoExternalThreadPanic"

2022-11-18 23:57 openbsd-386-71 go@04d6aa65 runtime.TestCgoExternalThreadPanic (log)

--- FAIL: TestCgoExternalThreadPanic (0.00s)
    crash_test.go:58: /tmp/workdir/tmp/go-build3123997662/testprogcgo.exe CgoExternalThreadPanic failed to start: context deadline exceeded

2022-11-21 17:16 openbsd-amd64-71 go@998949c0 runtime.TestCgoExternalThreadPanic (log)

--- FAIL: TestCgoExternalThreadPanic (0.00s)
    crash_test.go:58: /tmp/workdir/tmp/go-build1527382388/testprogcgo.exe CgoExternalThreadPanic failed to start: context deadline exceeded

2022-12-06 19:52 openbsd-386-71 go@03bf6f49 runtime.TestCgoExternalThreadPanic (log)

--- FAIL: TestCgoExternalThreadPanic (0.00s)
    crash_test.go:58: /tmp/workdir/tmp/go-build719402250/testprogcgo.exe CgoExternalThreadPanic failed to start: context deadline exceeded

2022-12-16 17:12 openbsd-amd64-71 go@f4b42f5c runtime.TestCgoExternalThreadPanic (log)

--- FAIL: TestCgoExternalThreadPanic (0.00s)
    crash_test.go:58: /tmp/workdir/tmp/go-build3915581810/testprogcgo.exe CgoExternalThreadPanic failed to start: context deadline exceeded

— watchflakes

[bcmills]

#57585 / #57847