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Date: Tue, 11 May 2004 08:40:59 -0600
From: Scott Long <scottl@freebsd.org>
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To: Colin Percival <colin.percival@wadham.ox.ac.uk>
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cc: freebsd-current@freebsd.org
Subject: Re: Panic on 5.2.1-R, netisr related?
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Colin Percival wrote:
>   Is this problem reproducible?  I ask because...
> 
> At 20:41 10/05/2004, Michael Nottebrock wrote:
> 
>>#4  0xc0675715 in bremfree (bp=0x0) at ../../../kern/vfs_bio.c:629
> 
>                          ^^^^^^
> 
>>#5  0xc06791c4 in getblk (vp=0xc312ab2c, blkno=1, size=16384, slpflag=0, 
>>slptimeo=0, flags=0)
>>   at ../../../kern/vfs_bio.c:2468
> 
>      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> ... this should never happen.  getblk dereferences bp during the four
> lines immediately before it calls bremfree(bp), so if bp is null, you
> should have seen a panic before getting this far.
> 
> Colin Percival
> 

This is actually from the secondary panic in the trace from the system
trying to sync after the first one.  All bets are off after the first
panic.

Scott