[Lustre-discuss] odd kernel crash after a heartbeat failover

[John White]

Hello Folks,
	We just had a very odd crash after a heartbeat failover that may or may not be related to each other.  I'm not specifically sure if this was an IO error on the disk (I see no actual EIO, just the journal commit crash).  Any ideas?  The FS went through recovery just fine and doesn't appear to have any corruption:
[...]
Apr 15 11:49:32 n0007.lustre heartbeat: [10940]: info: mach_down takeover complete. 
Apr 15 12:09:55 n0007.lustre kernel: Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:  
Apr 15 12:09:55 n0007.lustre kernel:  [<ffffffff88abc375>] :jbd:journal_commit_transaction+0xc33/0x132e 
Apr 15 12:09:55 n0007.lustre kernel: Oops: 0002 [1] SMP  
Apr 15 12:09:55 n0007.lustre kernel: Oops: 0002 [1] SMP  
Apr 15 12:09:55 n0007.lustre kernel: last sysfs file: /block/dm-3/dev 
Apr 15 12:09:55 n0007.lustre kernel: RIP  [<ffffffff88abc375>] :jbd:journal_commit_transaction+0xc33/0x132e 
Apr 15 12:09:55 n0007.lustre kernel: CR2: 0000000000000000 
Apr 15 12:09:55 n0007.lustre kernel: CR2: 0000000000000000 
Apr 15 12:13:25 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358805.4890 
Apr 15 12:13:25 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358805.3719 
Apr 15 12:13:25 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358805.3719 
Apr 15 12:13:25 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358805.4807 
Apr 15 12:13:26 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358806.3725 
Apr 15 12:13:30 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358810.3714 
Apr 15 12:13:30 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358810.4796 
Apr 15 12:13:30 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358810.3740 
Apr 15 12:13:30 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358810.4991 
Apr 15 12:13:39 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358819.3727 
Apr 15 12:13:39 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358819.5109 
Apr 15 12:13:39 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358819.5072 
Apr 15 12:13:39 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358819.4812 
Apr 15 12:13:40 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358820.3720 
Apr 15 12:13:41 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358821.3732 
Apr 15 12:13:41 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358821.5047 
Apr 15 12:13:41 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271358821.4862 
Apr 15 12:24:09 n0006.lustre kernel: LustreError: dumping log to /tmp/lustre-log.1271359449.3725


logs available upon request.
----------------
John White
High Performance Computing Services (HPCS)
(510) 486-7307
One Cyclotron Rd, MS: 50B-3209C
Lawrence Berkeley National Lab
Berkeley, CA 94720