Re: 2.6.16-rc1-mm2

[Neil Brown]

On Saturday January 21, reuben-lkml@xxxxxxxx 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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