Melchior FRANZ wrote:
> 
>   umount ...
>   cryptsetup remove ...
>   losetup -d ...
> 
> BUG: unable to handle kernel NULL pointer dereference at 00000004
> IP: [<c0158a75>] mempool_free+0xd/0x9a
...

Yes, I know about that problem and I am almost sure that
it is fixed by patch I sent there http://lkml.org/lkml/2009/3/5/63

Something changed in timing so probability of hitting that
bug apparently increased in the last kernel (the problem was there always:-)

I had asked Alasdair to queue that to dm queue for upstream...

Milan
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