[Lustre-discuss] LBUG on lustre 1.8.0

Kevin Van Maren kevin.van.maren at oracle.com
Sun Nov 21 20:18:52 PST 2010


Larry wrote:
> We add the "options libcfs libcfs_panic_on_lbug=1" in modprobe.conf to
> make the server kernel panic ASAP the LBUG happened. Is there some way
> to make the server dead a few seconds after the LBUG? We are also
> puzzled with the message lost during the LBUG happened.
>   

The messages should have gone to the console just fine (hopefully you 
are logging a serial console).
If you are talking about /var/log/messages, then yes, it will be missing 
the final output as the
messages don't have time to get written to disk on a kernel panic.

Kevin


> On Mon, Nov 22, 2010 at 10:42 AM, Kevin Van Maren
> <Kevin.Van.Maren at oracle.com> wrote:
>   
>> Sure, but I think for engineering to make progress on this bug, they are
>> going to want a crash dump.  If you can enable crash dumps and panic on lbug
>> (and if HA, increase dead timeout so it can complete the dump before being
>> shot in the head) it would provide more info for the bug report.
>>
>> That being said, there are quite a few other bugs that have been fixed since
>> 1.8.0, so you really should upgrade ASAP to 1.8.4.
>>
>> Kevin
>>
>>
>> On Nov 21, 2010, at 6:59 PM, Larry <tsrjzq at gmail.com> wrote:
>>
>>     
>>> We had a LBUG several days ago on our lustre 1.8.0. One OSS reported
>>>
>>> kernel: LustreError:
>>> 24669:0:(service.c:1311:ptlrpc_server_handle_request())
>>> ASSERTION(atomic_read(&(export)->exp_refcount) < 0x5a5a5a) failed
>>> kernel: LustreError:
>>> 24669:0:(service.c:1311:ptlrpc_server_handle_request()) LBUG
>>> kernel: Lustre: 24669:0:(linux-debug.c:222:libcfs_debug_dumpstack())
>>> showing stack for process 24669
>>> ......
>>>
>>> I google for this, and find little information about it. It seems to
>>> be a race condition on OSS, right? Should I open a bugzilla for this
>>> LBUG?
>>> Thanks.
>>> _______________________________________________
>>> Lustre-discuss mailing list
>>> Lustre-discuss at lists.lustre.org
>>> http://lists.lustre.org/mailman/listinfo/lustre-discuss
>>>       
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