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Date: Fri, 15 Jun 2012 18:50:24 +0700
From: Eugene Grosbein <egrosbein@rdtc.ru>
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To: Przemyslaw Frasunek <venglin@freebsd.lublin.pl>
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Cc: freebsd-net@freebsd.org, Andriy Gapon <avg@icyb.net.ua>
Subject: Re: mpd5/Netgraph issues after upgrading to 7.4
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15.06.2012 18:33, Przemyslaw Frasunek пишет:
> Dear All,
> 
> unfortunately, one of my mpd5 PPPoE access servers started panicing every few
> hours.
> 
> I'm running recent 8.3-STABLE (as of 23th May) with WITNESS, INVARIANTS and
> DEBUG_MEMGUARD compiled. Unfortunately, I'm unable to catch crashdump. For some
> reason, it is not saved on dumpdev.

The reason is that 8-STABLE fails to stop scheduler on panic
that breaks writing of crashdumps.

8.3-STABLE has new sysctl kern.stop_scheduler_on_panic.
You should set it to 1 to get crashdumps saved.

One more: does your box has PS/2 keyboard or USB? It matters too.
For systems having USB keyboard there is another patch needed to obtain
crashdumps (by Andriy Gapon):

http://www.kuzbass.ru/freebsd/patches/stop_scheduler_on_panic.usb.diff

Eugene Grosbein