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Date: Wed, 20 Jan 2010 19:16:59 +0200
From: Andriy Gapon <avg@icyb.net.ua>
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To: David Naylor <naylor.b.david@gmail.com>
References: <201001201543.15818.naylor.b.david@gmail.com>	<20100120162821.3f53af6a@ernst.jennejohn.org>	<201001201805.57798.naylor.b.david@gmail.com>
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Cc: freebsd-current@freebsd.org
Subject: Re: stacked unionfs freeze and crash FreeBSD
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on 20/01/2010 18:34 David Naylor said the following:
> 
> Here it is.  If anyone ones the full core.txt just shout.  
> 
> #0  doadump () at pcpu.h:223
> 223     pcpu.h: No such file or directory.
>         in pcpu.h
> (kgdb) #0  doadump () at pcpu.h:223
> #1  0xffffffff80589ba9 in boot (howto=260)
>     at /usr/src/sys/kern/kern_shutdown.c:416
> #2  0xffffffff80589fdc in panic (fmt=0xffffffff8098bd81 "double fault")
>     at /usr/src/sys/kern/kern_shutdown.c:579
> #3  0xffffffff8086e546 in dblfault_handler (frame=Variable "frame" is not 
> available.)
>     at /usr/src/sys/amd64/amd64/trap.c:884
> #4  0xffffffff808557fc in Xdblfault ()
>     at /usr/src/sys/amd64/amd64/exception.S:278
> #5  0xffffffff81e464c1 in unionfs_statfs (mp=Variable "mp" is not available.)
>     at /usr/src/sys/modules/unionfs/../../fs/unionfs/union_vfsops.c:428
> Previous frame inner to this frame (corrupt stack?)
> (kgdb)

Double-fault could indicate stack overflow.

-- 
Andriy Gapon