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Date:      Fri, 22 Sep 2006 16:24:41 -0400
From:      Vivek Khera <vivek@khera.org>
To:        stable@freebsd.org
Subject:   Re: ffs snapshot lockup
Message-ID:  <555B84D2-520F-44D6-84D6-CF9CE7EE47C7@khera.org>
In-Reply-To: <20060922190328.GA64849@xor.obsecurity.org>
References:  <917B087C-5E13-4D7F-94FA-95CB0E5C1884@khera.org> <20060922190328.GA64849@xor.obsecurity.org>

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On Sep 22, 2006, at 3:03 PM, Kris Kennaway wrote:

>> I know this is very un-useful as a bug report, but I'm putting this
>> out in case anyone else has noticed this.  It has never happened to
>> us before when we were running 5.4 and then 6.1 on this box.  Nothing
>> else changed on the system during this time.
>
> Yep, we'd need additional debugging to proceed.

How does one debug a system where the disk sub-system is frozen?  I  
have serial console with DDB/KDB built into the kernel and debugging  
symbols too.  Is that the only option here?

We're gonna try the full level 0 backup again monday and if it locks  
up I'll try to figure it out, but could use some hints as to where to  
poke in the kernel.


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