On 11/29/2011 09:18 PM, Mike Snitzer wrote:
> On Tue, Nov 29 2011 at 7:00am -0500,
> Heiko Carstens <heiko.carstens@xxxxxxxxxx> wrote:
>
>>>>> Hmm. Just to be on the safe side, could you try this one:
>>>>>
>>>>> diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
>>>>> index 5e0090e..e6fad46 100644
>>>>> --- a/drivers/md/dm-mpath.c
>>>>> +++ b/drivers/md/dm-mpath.c
>>>>> @@ -920,8 +920,10 @@ static int multipath_map(struct dm_target *ti,
>>>>> struct reque
>>>>> st *clone,
>>>>> map_context->ptr = mpio;
>>>>> clone->cmd_flags |= REQ_FAILFAST_TRANSPORT;
>>>>> r = map_io(m, clone, mpio, 0);
>>>>> - if (r < 0 || r == DM_MAPIO_REQUEUE)
>>>>> + if (r < 0 || r == DM_MAPIO_REQUEUE) {
>>>>> mempool_free(mpio, m->mpio_pool);
>>>>> + map_context->ptr = NULL;
>>>>> + }
>>>>>
>>>>> return r;
>>>>> }
>>>>
>>>> With your patch we haven't been able to reproduce the kernel crash until now.
>>>> Now we "only" run into I/O stalls, which before your patch we also did. But
>>>> repeatedly rebooting and retrying and ignoring the I/O stalls always lead to
>>>> a crash.
>>>> Gonzalo will run a couple of extra rounds so we can have a feeling if at least
>>>> one of the bugs could be fixed with your patch ;)
>>>
>>> Hi,
>>>
>>> Any update after further testing with Hannes' patch?
>>
>> Sorry for the late update, our internal IBM IMAP servers have been down
>> for nearly a week :/
>>
>> So, we were unable to reproduce the original bug with the patch applied
>> during various runs.
>
> OK, so it seems to be a benenficial change (and obviously correct to
> me). Hannes, care to formally post your fix to dm-devel so we can get
> it in 3.2-rc?
>
Yep, will do.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@xxxxxxx +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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