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List:       freebsd-hackers
Subject:    Re: Intermittent system hangs on 7.2-RELEASE-p1
From:       Kostik Belousov <kostikbel () gmail ! com>
Date:       2009-08-27 20:20:00
Message-ID: 20090827202000.GQ9623 () deviant ! kiev ! zoral ! com ! ua
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On Thu, Aug 27, 2009 at 04:14:39PM -0400, Linda Messerschmidt wrote:
> On Wed, Aug 26, 2009 at 4:42 PM, John Baldwin<jhb@freebsd.org> wrote:
> > One thing to note is that ktrace only logs voluntary context switches (i.e.
> > call to tsleep or waiting on a condition variable).  It specifically does not
> > log preemptions or blocking on a mutex,
> 
> I was not aware, thanks.
> 
> > so in theory if your machine was
> > livelocked temporarily that might explain this.
> 
> How would we determine that?
> 
> We are now able to reproduce this on a test machine, even after
> slipping in a 7.2-STABLE kernel with KTR enabled.  So we have a lot
> more options now.
> 
> Unfortunately, I don't really "get" KTR yet.  It looks like it has
> relevant info, but I was unable to correlate its huge timestamps (e.g.
> 6795522404430562) to ktrace output times (e.g. 1251387606.225544)
> showing problem areas.
> 
> What's my best bet from here?

How much memory is installed ?

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