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Date: Wed, 19 Jan 2011 14:44:01 +0600
From: Eugene Grosbein <egrosbein@rdtc.ru>
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Cc: freebsd-stable@freebsd.org
Subject: Re: 8-STABLE/amd64 semi-regular crash with "kernel trap 12
 with	interrupts disabled" in "process 12 (swi4: clock)"
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On 19.01.2011 03:12, Lev Serebryakov wrote:
> Hello, Freebsd-stable.
> 
> 
>   One of my servers crashes about once a week, with always same
> diagnostics: "kernel trap 12 with interrupts disabled" and in same
> process: "swi4: clock"
> 
>   It doesn't look as memory failure, as memtest86+ can not find any
> errors in 8 passes.
> 
>   Also, after this crash server refuse to auto-reboot, last message on
> console is "cpu_reset: Stopping other CPUs", and it hangs.
> 
>   Kernel config, booting dmesg & results of "savecore" are attached
> (bzipped).

There is known instability in em(4) driver in 8.2-RELEASE,
it may panic due to some lack of NULL pointer checks.
You should update to RELENG_8 containting fix and retest.

Eugene Grosbein