9 hangs with idletick = 0

[Poul-Henning Kamp]

In message <86lispaztm.fsf at ds4.des.no>, =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= wr
ites:
>Dag-Erling Sm=C3=B8rgrav <des at des.no> writes:
>> I've just built a kernel with KTR support, and with KTR_SPARE2, KTR_INTR
>> and KTR_SCHED enabled by default.  I'll see what turns up.  I'm also
>> going to try machdep.idle=3Dhlt with kern.eventtimer.idletick=3D0, and us=
>ing
>> a PCI re(4) instead of the on-board msk(4) while running with default
>> settings.
>
>Great, the bug does not occur when KTR is enabled.  The machine has been
>up for 14+ hours without crashing, despite plenty of network activity,
>which usually triggers a freeze within minutes.

For what it's worth, I regularly (=every 10-12 days or so) see all
timer activity in the system die and have to use the 4-sec power-switch
to get the system down.

This is on:

FreeBSD critter.freebsd.dk 9.0-CURRENT FreeBSD 9.0-CURRENT #0 r224239M: Fri Aug 19 14:35:16 UTC 2011     phk at critter.freebsd.dk:/sys/amd64/compile/CRITTER  amd64


-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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Never attribute to malice what can adequately be explained by incompetence.