Re: BUG at drivers/md/kcopyd.c:146 (was: [PATCH 1/9] device-mapper snapshot: load metadata on creation)

[Alasdair G Kergon]

On Sat, Apr 15, 2006 at 01:19:51PM +0200, Juergen Kreileder wrote:
> I'm using devmapper 1.02.03 and lvm2 2.02.02 with 2.6.16.2,
> nevertheless my logical volumes locked up three time when removing
> snapshots so far.  Twice I got BUG at drivers/md/kcopyd.c:146, the
> third time logging stopped at the first lvremove.
 
> 2.6.15 and earlier kernels in combination with older tools worked fine
> over the last year.
 
I found several bugs in the snapshot code when I reviewed it,
including (thankfully hard-to-trigger) silent data corruption.

Patches went into 2.6.17-rc1.  [There's one unfinished patch
outstanding for a theoretical race that I've only been able to
reproduce under artificial conditions.]

> kernel BUG at drivers/md/kcopyd.c:146!

Probably needs this patch (12th March):

  dm snapshot: fix kcopyd destructor

Alasdair
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