runtime: timeout in TestCgoCCodeSIGPROF and TestCgoExecSignalMask on linux-ppc64le-buildlet

[bcmills]

2020-04-09T01:16:43-376472d/linux-ppc64le-buildlet

CC @laboger @ceseo for linux-ppc64le, @aclements @ianlancetaylor for runtime_test.TestCgo*, @andybons for possible builder slowness

[laboger]

A few things look odd about the bad output. There is a new runtime test recently added that is spewing output about recurseFn now which wasn't before?

Also, the output shows it timed out at 3m, I thought at one time it was higher, like at least 4m or maybe more. Is there to see if this has changed in the past few months?

[bcmills]

The log in 2021-09-15T03:29:41-b26d325/linux-ppc64le-power9osu has a shorter timeout applied to the subprocess and includes a goroutine dump for it.

(2020-08-25T20:04:27-8381408/openbsd-amd64-64 may or may not be legit: it's from the period where the openbsd-amd64 builders were highly unstable due to a platform bug.)

greplogs -l -e 'FAIL: TestCgoCCodeSIGPROF .*(?:\n\s+.*)*SIGQUIT' --since=2020-04-10
2021-09-15T03:29:41-b26d325/linux-ppc64le-power9osu
2020-08-25T20:04:27-8381408/openbsd-amd64-64