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

[Lars Ellenberg]

/ 2007-02-15 08:50:06 +0100
\ Martin Bene:
> Hi Lars,
> 
> > > 
> > > 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.
> 
> Ok, recompiling , installing & booting kernel/modules/drbd to be 100%
> sure everything matches. 
> 
> > 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.
> 
> Nope, I can definitely exclude that possibility:
> 
> # zcat /proc/config.gz  |grep CONN
> CONFIG_CONNECTOR=y
> 
> Let's see if I can still get the same error or if it's gone away; 
> 
> Nope, kernel/modules/drbd recompile + install didn't change a thing,
> same error still. Next test: go back to 8.0.0 release (2713) instead of
> currenct svn (2747M)...
> 
> Nope, also no change, still crashes.
> 
> Circumstances may be somewhat unusual:
> 
> * start drbd on both nodes. Status connected, both devices on both nodes
> are secondary.
> * start heartbeat on just one node.
> 
> Result: Heartbeat powers off node and switches drbd0 secondary =>
> primary right next, resulting in kernel bug. BTW, doesn't happen
> allways.

interessting.
we may have an interessting race condition here :)


> Strange - this error happens pretty consistently when running via
> heartbeat, I haven't been ablt to reproduce outside heartbeat though. 
> 
> Any further hints what'S going on are greatly apreciated :-)

does going back to kernel 2.6.19.3 or 2.6.16.something help?

-- 
: 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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