Okay,

Finally I was able to reproduce the problem using:

#!/bin/bash

while true; do

        crm node standby clustertrusty01
        sleep 7
        crm node online clustertrusty01
        sleep 7

        crm node standby clustertrusty02
        sleep 7
        crm node online clustertrusty02
        sleep 7

        crm node standby clustertrusty03
        sleep 7
        crm node online clustertrusty03
        sleep 7

done

And the attached CIB (cib.xml).

 could generate the following crashes:

root@clustertrusty01:/var/crash# ls -lah -1 | grep usr 
-rw-r----- 1 root root 257K Oct 30 01:18 _usr_lib_pacemaker_lrmd.0.crash 
-rw-r----- 1 root root 434K Oct 30 01:18 _usr_lib_pacemaker_stonithd.0.crash 

root@clustertrusty02:/var/crash# ls -lah -1 | grep usr 
-rw-r----- 1 root root 257K Oct 30 01:20 _usr_lib_pacemaker_lrmd.0.crash 
-rw-r----- 1 root root 441K Oct 30 01:21 _usr_lib_pacemaker_stonithd.0.crash 

root@clustertrusty03:/var/crash# ls -lah -1 | grep usr 
-rw-r----- 1 root root 258K Oct 30 01:21 _usr_lib_pacemaker_lrmd.0.crash 
-rw-r----- 1 root root 434K Oct 30 01:18 _usr_lib_pacemaker_stonithd.0.crash 

root@clustertrusty04:/var/crash# ls -lah -1 | grep usr 
-rw-r----- 1 root root 443K Oct 30 01:21 _usr_lib_pacemaker_stonithd.0.crash 


** Changed in: pacemaker (Ubuntu)
     Assignee: (unassigned) => Rafael David Tinoco (inaddy)

** Attachment added: "cib.xml"
   
https://bugs.launchpad.net/ubuntu/+source/pacemaker/+bug/1368737/+attachment/4249543/+files/cib.xml

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https://bugs.launchpad.net/bugs/1368737

Title:
  Pacemaker can seg fault on crm node online/standy

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