[DRBD-user] Kernel 2.6.20+ Drbd 8.0.0 (2738M): BUG: unable to handle kernel NULL pointer

[Lars Ellenberg]

/ 2007-02-14 08:43:40 +0100
\ Martin Bene:
> Hi, I'm seeing the above error in one of the scenarios I'm testing:
> 
> * Kernel 2.6.20
> * drbd 8.0.0, SVN Revision 2738
> * 2 drbd devices
> 
> I've seen the above bug several times, most recently after hard
> resetting a node that was primary for one of the devices.

as this happened in the dispatcher of the connector, I suspect that the
kernel configuration you built the drbd module against does not match
your running kernel.

or maybe there is also the CONNECTOR missing from your kernel,
and for some reason our detection magic did not prevent to
build the "built-in-backport", with non-matching netlink-ABI.

make sure you have your "kernel-native" CONNECTOR enabled,
and make sure you really build the drbd module against a
perfectly matching configured kernel headers/source.

> On reboot I got the following bug in kernel logs:
> 
> Feb 14 10:37:17 webc-neu2 kernel: drbd: initialised. Version: 8.0.0
> (api:86/proto:86)
> Feb 14 10:37:17 webc-neu2 kernel: drbd: SVN Revision: 2738M build by
> root at webc-neu2, 2007-02-06 14:56:34
> Feb 14 10:37:17 webc-neu2 kernel: drbd: registered as block device major
> 147
> Feb 14 10:37:17 webc-neu2 kernel: drbd: minor_table @ 0xf7a888c0
> Feb 14 10:37:17 webc-neu2 kernel: drbd0: disk( Diskless -> Attaching 
 [... snip ... ]

> Feb 14 10:37:17 webc-neu2 kernel: drbd1: conn( Unconnected ->
> WFConnection )
> Feb 14 10:37:17 webc-neu2 kernel: BUG: unable to handle kernel NULL
> pointer dereference at virtual address 00000000
> Feb 14 10:37:17 webc-neu2 kernel:  printing eip:
> Feb 14 10:37:17 webc-neu2 kernel: 00000000

> Feb 14 10:37:17 webc-neu2 kernel: Process cqueue/1 (pid: 127,

> Feb 14 10:37:17 webc-neu2 kernel: Call Trace:
> Feb 14 10:37:17 webc-neu2 kernel:  [cn_queue_wrapper+13/36]

-- 
: Lars Ellenberg                            Tel +43-1-8178292-0  :
: LINBIT Information Technologies GmbH      Fax +43-1-8178292-82 :
: Vivenotgasse 48, A-1120 Vienna/Europe    http://www.linbit.com :
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