[DRBD-user] Kernel error message with drbd 8.4.1

[Lars Ellenberg]

On Thu, Feb 02, 2012 at 08:39:40AM -0430, Jose Ildefonso Camargo Tolosa wrote:
> Greetings,
> 
> I just tried to update to DRBD 8.4.1 (after having issues with 8.3.7 :
> it would freeze reads while it was writing, see may other thread for
> more info "Read performance goes really low while writing."), and
> things looks much worse..... it just freeze to stall!,  I can't
> background the cp process anymore, and I had to actually reboot the
> systems.  Oh, and I got this on dmesg (before rebooting):
> 
> [ 4645.904918] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
> [ 4645.951918] IP: [<ffffffff81439544>] clone_endio+0x34/0xe0
> [ 4646.354667] Pid: 3517, comm: kdmflush Not tainted 2.6.32-38-server #83-Ubuntu X8DTN
> [ 4647.103463] Call Trace:
> [ 4647.118114]  [<ffffffff81173d2d>] bio_endio+0x1d/0x40
> [ 4647.148336]  [<ffffffffa03a87fb>] drbd_make_request+0x34b/0x350 [drbd]
> [ 4647.259232]  [<ffffffff812a22a1>] generic_make_request+0x1b1/0x4f0
> [ 4647.365981]  [<ffffffff81438fcd>] __map_bio+0xad/0x130
> [ 4647.396717]  [<ffffffff814394fd>] __clone_and_map+0x4ad/0x4c0
> [ 4647.464943]  [<ffffffff8143a5d8>] __split_and_process_bio+0x108/0x190
> [ 4647.503466]  [<ffffffff8143a6b6>] dm_flush+0x56/0x70
> (.....)
> 
> I removed some lines because it was too long (I you need them, I could
> paste them somewhere).

Very nice, thank you ;-)
That should be fixed by
http://git.drbd.org/gitweb.cgi?p=drbd-8.4.git;a=commitdiff;h=55a81dc

Shame on us for not checking the compiler warnings of your build farm.

Cheers,

-- 
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
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