From owner-freebsd-current@FreeBSD.ORG  Wed Aug 31 11:48:05 2005
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From: Suleiman Souhlal <ssouhlal@FreeBSD.org>
Date: Wed, 31 Aug 2005 13:47:49 +0200
To: Matthias Andree <matthias.andree@gmx.de>
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Cc: freebsd-current@FreeBSD.org, Jeremie Le Hen <jeremie@le-hen.org>,
	Kris Kennaway <kris@obsecurity.org>
Subject: Re: nfs through nullfs
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Hi,

On Aug 31, 2005, at 12:12 PM, Matthias Andree wrote:

> Kris Kennaway <kris@obsecurity.org> writes:
>
>
>> On Tue, Aug 30, 2005 at 02:44:35PM +0200, Jeremie Le Hen wrote:
>>
>>>> Subject says it all.
>>>>
>>>> mount a ext2 file system, use it as basis for a nullfs mount ->  
>>>> panic.
>>>>
>>>
>>> Mount a NFS filesystem, use it as basis for nullfs mount -> panic.
>>>
>>
>> Please provide details.
>>
>
> OK, to reproduce, three steps apart from having an ext2 file system
> (the ext2 FS is clean according to e2fsck)
>
> mount_ext2fs /dev/ad0s5 /linux
> mount_nullfs /linux /mnt
> umount /mnt                    -> panic, "locking against myself"
>
> backtrace in the kernel debugger, copied manually:

Can you try the patch at http://people.freebsd.org/~ssouhlal/testing/ 
null_vnops.c-20050831.diff ?

Bye,
--
Suleiman Souhlal     | ssouhlal@vt.edu
The FreeBSD Project  | ssouhlal@FreeBSD.org