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Date: Thu, 19 Jan 2012 19:18:36 +0200
From: Andriy Gapon <avg@FreeBSD.org>
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Cc: Alexander Motin <mav@FreeBSD.org>, freebsd-stable@FreeBSD.org
Subject: Re: Strange 'hangs' with RELENG_9
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on 19/01/2012 15:51 László KÁROLYI said the following:
> Recently I updated my RELENG_8 to RELENG_9. Since then, the server hangs
> from time to time for 5 minutes. When I run a top in a remote terminal,
> I can see that it hangs so strong, that the clock hangs too. When it
> continues to run , the time continues from the when it 'hanged'. TCP
> connections are also dropped with timeout at that time. However, no
> kernel panic, and i can't see anything in the dmesg log too.
> 
> A strange thing is, the server continues working when I press a key at
> the physical console (I'm doing this with a remote IP console). More
> strange thing is, when I do a reboot, the server flushes all its disks,
> and then does a panic, instead of rebooting.

Please provide output of the following sysctls:
sysctl kern.eventtimer
sysctl kern.timecounter

-- 
Andriy Gapon