On Sat, Jun 20, 2015 at 07:56:29PM -0500, Don Lee wrote:
> FWIW, I have had a problem with my server getting stuck in "tstile". I could
> not reproduce the problem easily, but I saw it in production often enough
> that it was a headache. The Intel port (as opposed to PPC) seems not to have
> the problem.
>
> If there is no timeout on this loop, and it theoretically only has a problem
> on HW errors, I have doubts. The machine with the hangs does not have any
> other symptoms of HW errors. HOWEVER, I have a persistent suspicion that the
> PPC port drops interrupts on occasion. Just sayin.
>
> If this hang happens, I think a panic is far better than a hang. What I would
> see is the machine lock up hard, with zillions of processes "stuck" in
> tstile, and no new procs could start. If I caught this early, I could get a
> couple of ps outputs done. Otherwise, I could get into the kernel debugger -
> sometimes.
"tstile" is a generic wait channel used by cv_wait().
Any code using cv_wait() could end up stuck here, so your problem
may be completely unrelated to vnodes ... or even if it's related
to vnodes, is may be a different issue.
--
Manuel Bouyer <bou...@antioche.eu.org>
NetBSD: 26 ans d'experience feront toujours la difference
--
