runtime: TestSigStackSwapping failures

[gopherbot]

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

Issue created automatically to collect these failures.

Example (log):

--- FAIL: TestSigStackSwapping (0.01s)
    crash_cgo_test.go:502: /opt/golang/tmp/workdir-host-solaris-oracle-amd64-oraclerel/tmp/go-build3722635515/testprogcgo.exe SigStack failed to start: context deadline exceeded

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

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

2023-04-11 20:25 solaris-amd64-oraclerel go@28480216 runtime.TestSigStackSwapping (log)

--- FAIL: TestSigStackSwapping (0.01s)
    crash_cgo_test.go:502: /opt/golang/tmp/workdir-host-solaris-oracle-amd64-oraclerel/tmp/go-build3722635515/testprogcgo.exe SigStack failed to start: context deadline exceeded

2023-04-19 14:36 linux-s390x-ibm go@9cad0cc6 runtime.TestSigStackSwapping (log)

--- FAIL: TestSigStackSwapping (0.79s)
    crash_cgo_test.go:502: /data/golang/workdir/tmp/go-build1486251316/testprogcgo.exe SigStack: exec: WaitDelay expired before I/O complete

— watchflakes

[bcmills]

Duplicate of #60152