[Bug 1000355] Re: drbd fence-peer breaks when using kernel 2.6.32-41

[Jacob Smith]

** Description changed:

  Ubuntu 10.04 Lucid with 2.6.32-41 kernel and drbd8
  
  Kernel 2.6.32-41 fixed a consistency issue around UMH_WAIT_PROC in this
  bug:
  
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/963685
  
  This causes the drbd fencing script's exit codes to be incorrectly
  interpreted which then breaks the drbd fencing:
+ 
+ **** This also affects linux source in all distributions after Lucid
+ with the applicable kernel versions patched in bug 963685 above since
+ the drbd kernel module is mainlined in those more recent kernel versions
+ ****
  
  To replicate:
  
  Have fencing enabled in drbd config:
  In handlers section: fence-peer "/usr/lib/drbd/crm-fence-peer.sh"
  In the disk section:  fencing resource-only;
  
  Have both drbd nodes uptodate with one primary one secondary
  Make the fence-peer get executed.  I did this by:
  Having drbd under pacemaker control. Both pacemaker nodes were online and in-sync. Drbd in primary on node 1.  Put node 1 in standby. Fence-peer will get executed.
  Fence handler will report fence-peer exited with 0 (broken) - such as this:
  
  May 15 09:45:17 kernel: [56645.420714] block drbd0: helper command: /sbin/drbdadm fence-peer minor-0
  May 15 09:45:17 kernel: [56645.420920] block drbd0: helper command: /sbin/drbdadm fence-peer minor-0 exit code 0 (0x0)
  May 15 09:45:17 kernel: [56645.420925] block drbd0: fence-peer helper broken, returned 0
  
  If you log debug output of fence-peer script (crm-fence-peer.sh) when
  executed it exits 4 not the kernel reported 0.
  
- 
  This commit in drbd git should fix this behavior:
  
  http://git.drbd.org/gitweb.cgi?p=drbd-8.3.git;a=commitdiff;h=e6cbc43
  
- 
- This will cause complete failure of a drbd setup using fencing to auto-recover or continue without manual intervention and repair.
+ This will cause complete failure of a drbd setup using fencing to auto-
+ recover or continue without manual intervention and repair.

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https://bugs.launchpad.net/bugs/1000355

Title:
  drbd fence-peer breaks when using kernel 2.6.32-41

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