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From: Neil Brown <neilb@suse.de>
To: Reuben Farrelly <reuben-lkml@reub.net>
Date: Tue, 24 Jan 2006 14:51:56 +1100
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Message-ID: <17365.42076.633018.163881@cse.unsw.edu.au>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.16-rc1-mm2
In-Reply-To: message from Reuben Farrelly on Saturday January 21
References: <20060120031555.7b6d65b7.akpm@osdl.org>
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On Saturday January 21, reuben-lkml@reub.net wrote:
> md: stopping all md devices.
> md: md1 switched to read-only mode.
> BUG: unable to handle kernel NULL pointer dereference<6>md: md2 switched to 
> read-only mode.
>   at virtual address 0000001c
>   printing eip:
> b02a6951
> *pde = 00000000
> Oops: 0000 [#1]
> SMP
> last sysfs file: /devices/pci0000:00/0000:00:1f.3/i2c-0/0-002e/vrm
> Modules linked in: iptable_mangle iptable_nat ip_nat ip_conntrack nfnetlink 
> iptable_filter ip_tables nfsd exportfs lockd sunrpc ipv6 ip_gre binfmt_misc 
> serio_raw piix hw_random
> CPU:    0
> EIP:    0060:[<b02a6951>]    Not tainted VLI
> EFLAGS: 00010002   (2.6.16-rc1-mm2 #1)
> EIP is at bitmap_daemon_work+0x144/0x391

Hmmmm.... yep. I see the problem.  We shouldn't be tearing down the
bitmap when switching to read-only.  Patch to follow.

Thanks,

NeilBrown
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