runtime: TestNetpollBreak failing on netbsd-arm-bsiegert

[bcmills]

Now that #35037 is resolved, the netbsd-arm-bsiegert builder is showing a different failure mode, this time in TestNetpollBreak (https://build.golang.org/log/bc18dc9b999d2adff72d678f0608afc8a6cbc4d9):

--- FAIL: TestNetpollBreak (10.03s)
    proc_test.go:1020: netpollBreak did not interrupt netpoll: slept for: 10.028473916s
FAIL
FAIL	runtime	190.460s

CC @ianlancetaylor @mknyszek

[ianlancetaylor]

Yes, this one is very puzzling. I don't understand why this test would start failing at CL 202441. I'm also wondering what happens on freebsd-arm and openbsd-arm, but we don't have a builder for the latter and our builders for netbsd-arm and freebsd-arm are limited.

[ianlancetaylor]

This problem has fixed itself, with the dashboard showing two successful runs after an unrelated CL. Optimistically closing.