runtime: TestRecoverBeforePanicAfterGoexit2 failures

[bcmills]

#!watchflakes
post <- pkg == "runtime" && test == "TestRecoverBeforePanicAfterGoexit2" && `output does not start with`

2022-11-23 19:34 linux-mips64le-rtrk go@a8510f92 runtime.TestRecoverBeforePanicAfterGoexit2 (log)

--- FAIL: TestRecoverBeforePanicAfterGoexit2 (69.55s)
    crash_test.go:58: /tmp/gobuilder-mips64le/tmp/go-build3305139991/testprog.exe RecoverBeforePanicAfterGoexit2: exit status 2
    crash_test.go:468: output does not start with "fatal error: no goroutines (main called runtime.Goexit) - deadlock!":

(factored out from #55167 (comment))

[bcmills]

(CC @golang/mips)

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "runtime" && test == "TestRecoverBeforePanicAfterGoexit2"

2022-11-23 19:34 linux-mips64le-rtrk go@a8510f92 runtime.TestRecoverBeforePanicAfterGoexit2 (log)

--- FAIL: TestRecoverBeforePanicAfterGoexit2 (69.55s)
    crash_test.go:58: /tmp/gobuilder-mips64le/tmp/go-build3305139991/testprog.exe RecoverBeforePanicAfterGoexit2: exit status 2
    crash_test.go:468: output does not start with "fatal error: no goroutines (main called runtime.Goexit) - deadlock!":

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "runtime" && test == "TestRecoverBeforePanicAfterGoexit2"

2022-11-18 23:57 openbsd-386-71 go@04d6aa65 runtime.TestRecoverBeforePanicAfterGoexit2 (log)

--- FAIL: TestRecoverBeforePanicAfterGoexit2 (0.03s)
    crash_test.go:58: /tmp/workdir/tmp/go-build3123997662/testprog.exe RecoverBeforePanicAfterGoexit2 failed to start: context deadline exceeded

— watchflakes