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

[Olivier Bonvalet <ceph.list@daevel.fr>]

Le mardi 25 mars 2014 à 22:18 +0200, Ilya Dryomov a écrit :
> On Tue, Mar 25, 2014 at 9:03 PM, Alex Elder <elder@ieee.org> wrote:
> > On 03/25/2014 01:53 PM, Olivier Bonvalet wrote:
> >> Le mardi 25 mars 2014 à 12:43 -0500, Alex Elder a écrit :
> >>> Please try applying this, on top of the previous patch.
> >>> If you can then reproduce the problem we'll have a bunch
> >>> of new information about the particular request that's
> >>> leading to the failure.  That might tell us what more we
> >>> can do to find the root cause.  Thank you.
> >>>
> >>>                                      -Alex
> >>>
> >>> PS  I hope my mailer doesn't botch the long lines.  It might.
> >>>
> >>
> >> Here the execution will continue, no more kernel panic after this
> >> debugging display. Is it wanted ?
> >
> >
> > I guess it should panic.  I'm glad you mentioned this.
> 
> Just in case, if you haven't done it already: stick rbd_assert(0);
> after the last printk in that if statement, so it looks like this:
> 
> if (which != img_request->next_completion) {
>         printk("%s: bad image object request information:\n", __func__);
>         printk("obj_request %p\n", obj_request);
>         printk("    ->object_name <%s>\n", obj_request->object_name);
>         ...
> 
>         printk("img_request %p\n", img_request);
>         printk("    ->snap 0x%016llx\n", img_request->snap_id);
>         ...
>         printk("    ->result %d\n", img_request->result);
> 
>         rbd_assert(0);
> }
> 
> Thanks,
> 
>                 Ilya
> 

Without the rbd_assert(0), I add this hang :


Mar 25 21:17:58 murmillia kernel: [ 2205.255933] rbd_img_obj_callback: bad image object request information:
Mar 25 21:17:58 murmillia kernel: [ 2205.255938] obj_request ffff88025a2b3c48
Mar 25 21:17:58 murmillia kernel: [ 2205.255940]     ->object_name <rb.0.1536881.238e1f29.000000000439>
Mar 25 21:17:58 murmillia kernel: [ 2205.255941]     ->offset 0
Mar 25 21:17:58 murmillia kernel: [ 2205.255943]     ->length 28672
Mar 25 21:17:58 murmillia kernel: [ 2205.255944]     ->type 0x1
Mar 25 21:17:58 murmillia kernel: [ 2205.255945]     ->flags 0x3
Mar 25 21:17:58 murmillia kernel: [ 2205.255946]     ->which 1
Mar 25 21:17:58 murmillia kernel: [ 2205.255948]     ->xferred 28672
Mar 25 21:17:58 murmillia kernel: [ 2205.255949]     ->result 0
Mar 25 21:17:58 murmillia kernel: [ 2205.255950] img_request ffff8802536c4a60
Mar 25 21:17:58 murmillia kernel: [ 2205.255952]     ->snap 0xffff880257f85ec0
Mar 25 21:17:58 murmillia kernel: [ 2205.255953]     ->offset 4534026240
Mar 25 21:17:58 murmillia kernel: [ 2205.255954]     ->length 45056
Mar 25 21:17:58 murmillia kernel: [ 2205.255955]     ->flags 0x1
Mar 25 21:17:58 murmillia kernel: [ 2205.255957]     ->obj_request_count 1
Mar 25 21:17:58 murmillia kernel: [ 2205.255958]     ->next_completion 2
Mar 25 21:17:58 murmillia kernel: [ 2205.255959]     ->xferred 45056
Mar 25 21:17:58 murmillia kernel: [ 2205.255960]     ->result 0
Mar 25 21:17:58 murmillia kernel: [ 2205.255962] 
Mar 25 21:17:58 murmillia kernel: [ 2205.255962] Assertion failure in rbd_img_obj_callback() at line 2162:
Mar 25 21:17:58 murmillia kernel: [ 2205.255962] 
Mar 25 21:17:58 murmillia kernel: [ 2205.255962] 	rbd_assert(which < img_request->obj_request_count);
Mar 25 21:17:58 murmillia kernel: [ 2205.255962] 
Mar 25 21:17:58 murmillia kernel: [ 2205.256141] ------------[ cut here ]------------
Mar 25 21:17:58 murmillia kernel: [ 2205.256178] kernel BUG at drivers/block/rbd.c:2162!


--
To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html