Re: [BUG] rbtree bug with mmotm 2009-04-14-17-24

[Jens Axboe]

On Wed, Apr 22 2009, Steve Wise wrote:
>
>>>
>>> No there are a few patches applied that are heading upstream, but one 
>>> is in the NFS RDMA server which isn't loaded yet and the rest are in  
>>> iw_cxgb3 (iwarp driver) which also hasn't loaded at the time we  
>>> crash. NOTE:  Out of 4 power cycles, one booted up ok, 3 hit the 
>>> crash.
>>>
>>>
>>>
>>
>> By the way, this one looks different from the last one I saw.  So its  
>> not consistently crashing in the same spot.  The one I hit yesterday  
>> (which I don't have the OOPs dump for was in rb_erase().
>>
>> Steve.
>
> I'll start bisecting to isolate this.

Don't bother, I see what the bug is now. It's caused by commit
a36e71f996e25d6213f57951f7ae1874086ec57e and it's due to ->ioprio being
changed without the prio rb root being adjusted.

I'll provide a fix shortly.

-- 
Jens Axboe

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/