Re: Issue #5876 : assertion failure in rbd_img_obj_callback()

[Alex Elder <elder@ieee.org>]

On 03/25/2014 04:04 AM, Ilya Dryomov wrote:
> On Tue, Mar 25, 2014 at 10:39 AM, Olivier Bonvalet <ceph.list@daevel.fr> wrote:
>> Hi,
>>
>> what can/should I do to help fix that problem ?
>>
>> for now, RBD kernel client hang on :
>>         Assertion failure in rbd_img_obj_callback() at line 2131:
>>            rbd_assert(which >= img_request->next_completion);

If you can build your own kernel as Ilya says I'd like to
see the values of which and img_request->next_completion
here.

If you can't, is there anything interesting about your
workload that might help reproduce the problem?

Thanks.

					-Alex

>>
>> or on :
>>         Assertion failure in rbd_img_obj_callback() at line 2127:
>>             rbd_assert(img_request != NULL);
>>
>>
>> I have both case at least once per week, on latest 3.13.5 kernels.
>>
>> It seems that the problem occurs only on more loaded servers (I have 4
>> near same servers, and crash occurs on two of them. If I move the VM,
>> crash follows...).
> 
> Hi,
> 
> I'm looking into this, but it doesn't reproduce on my boxes.  This must
> be some sort of race and the fact that there is nothing else in the
> dmesg right before the splats doesn't help.
> 
> Can you send me your 3.13.5 rbd.ko and libceph.ko?  Also, just so
> I know, can you build your own kernel?
> 
> Thanks,
> 
>                 Ilya
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