runtime: TestCgoSigfwd failures

[gopherbot]

#!watchflakes
post <- pkg == "runtime" && test == "TestCgoSigfwd" && date < "2023-06-01"

Issue created automatically to collect these failures.

Example (log):

--- FAIL: TestCgoSigfwd (0.02s)
    crash_test.go:58: /tmp/buildlet/tmp/go-build4119296738/testprogcgo.exe CgoSigfwd: exit status 1
    crash_cgo_test.go:768: expected "OK\n", but got:
        SIGSEGV caught in C unexpectedly

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

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

2023-01-26 07:17 darwin-amd64-10_15 go@cea70301 runtime.TestCgoSigfwd (log)

--- FAIL: TestCgoSigfwd (0.02s)
    crash_test.go:58: /tmp/buildlet/tmp/go-build4119296738/testprogcgo.exe CgoSigfwd: exit status 1
    crash_cgo_test.go:768: expected "OK\n", but got:
        SIGSEGV caught in C unexpectedly

2023-01-26 07:17 darwin-amd64-11_0 go@cea70301 runtime.TestCgoSigfwd (log)

--- FAIL: TestCgoSigfwd (0.06s)
    crash_test.go:58: /tmp/buildlet/tmp/go-build2556092564/testprogcgo.exe CgoSigfwd: exit status 1
    crash_cgo_test.go:768: expected "OK\n", but got:
        SIGSEGV caught in C unexpectedly

2023-01-26 10:15 darwin-amd64-10_15 go@4df10fba runtime.TestCgoSigfwd (log)

--- FAIL: TestCgoSigfwd (0.02s)
    crash_test.go:58: /tmp/buildlet/tmp/go-build1310876794/testprogcgo.exe CgoSigfwd: exit status 1
    crash_cgo_test.go:768: expected "OK\n", but got:
        SIGSEGV caught in C unexpectedly

2023-01-26 10:15 darwin-amd64-11_0 go@4df10fba runtime.TestCgoSigfwd (log)

--- FAIL: TestCgoSigfwd (0.06s)
    crash_test.go:58: /tmp/buildlet/tmp/go-build4292740019/testprogcgo.exe CgoSigfwd: exit status 1
    crash_cgo_test.go:768: expected "OK\n", but got:
        SIGSEGV caught in C unexpectedly

— watchflakes

[bcmills]

Curiously all on darwin/amd64. 🤔
(attn @golang/runtime)

[bcmills]

Oh, right.

[bcmills]

Duplicate of #58068

[gopherbot]

Found new dashboard test flakes for:

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

2023-05-12 19:21 linux-s390x-ibm-race go@f2fcea50 runtime.TestCgoSigfwd (log)

--- FAIL: TestCgoSigfwd (0.00s)
    crash_cgo_test.go:795: /data/golang/workdir/tmp/go-build1448985958/testprogcgo.exe CgoSigfwd failed to start: context deadline exceeded

— watchflakes

[cherrymui]

The last one is #60109.