[CentOS] Cause for kernel panic

Hi ! On an 8-node cluster, one of the node did a kernel panic.

The only bit of information I have is on a ssh console I had open, which 
said :


Message from syslogd at node108 at Dec 14 19:00:15 ...
  kernel:------------[ cut here ]------------

Message from syslogd at node108 at Dec 14 19:00:15 ...
  kernel:invalid opcode: 0000 [#1] SMP

Message from syslogd at node108 at Dec 14 19:00:15 ...
  kernel:last sysfs file: 
/sys/devices/system/cpu/cpu15/cache/index2/shared_cpu_map

Message from syslogd at node108 at Dec 14 19:00:15 ...
  kernel:Stack:

Message from syslogd at node108 at Dec 14 19:00:15 ...
  kernel:Call Trace:

Message from syslogd at node108 at Dec 14 19:00:15 ...
  kernel:Code: 01 00 00 e8 26 8a cd e0 85 c0 0f 85 0e ff ff ff 48 89 df 
e8 76 f8 ff ff e9 01 ff ff ff 31 d2 eb d4 48 89 de 31 ff e8 c3 e3 ff ff 
<0f> 0b eb fe 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 55 48

Message from syslogd at node108 at Dec 14 19:00:15 ...
  kernel:Kernel panic - not syncing: Fatal exception


 From this, is there a way to determine the cause ? kdump is not 
confirgured nor used, since the fencing of the node renders kdump useless.

This is the second time in a few weeks it happens.