[Drbd-dev] NULL pointer derefernce in 8.4.7-1 during drbd_destroy_connection()

[Feng Sun]

On Wed, 30 Mar 2016, Lars Ellenberg wrote:

>* On Wed, Mar 30, 2016 at 02:19:07AM +0000, Eric Wheeler wrote:
*>* > Hello all,
*>* >
*>* > We are getting kernel crashes in linux 4.1.20 with the drbd-8.4.git tree
*>* > at commit 3a6a769340ef93b1ba2792c6461250790795db49 .
*>* >
*>* > I don't see anything in the newer commits that addresses this issue so
*>* > I'm posting---but I'll try the latest commit in master, too, just in case.
*>* >
*>* > Please see the backtrace below.  I also included our global_common.conf
*>* > further down.  This is protocol A and the link is quite slow.  This NULL
*>* > ptr dereference appears to show up when the drbd kernel thread is blocked
*>* > for a long time.  It might happen at reconnect time because the
BUG didn't
*>* > show up until 13 seconds after the P_BARRIER error.
*>* >
*>* > The problem is pretty reproducable, so I can probably test patches.
*>* > Please let me know what I can do to help test.
*> >* DRBD logs of both peers leading up to the incident may be useful.*


*I have met same issue with 8.4.9, but I cannot reproduce this easily.can
you help to share about the reproduce steps? *

-- 

Neil
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