Re: WARNING: CPU: 1 PID: 23668 at drivers/net/wireless/intel/iwlwifi/mvm/sta.c:1539 iwl_mvm_rm_sta+0x3ce/0x450

[Jens Axboe <axboe@kernel.dk>]

On 03/10/2017 05:01 AM, Luca Coelho wrote:
> Hi Jens,
> 
> On Thu, 2017-03-09 at 21:41 -0700, Jens Axboe wrote:
>> On 03/01/2017 09:10 PM, Jens Axboe wrote:
>>> On 03/01/2017 08:33 PM, Luca Coelho wrote:
>>>> Hi Jens,
>>>>
>>>> On Mar 1, 2017 20:25, Jens Axboe <axboe@kernel.dk> wrote:
>>>>
>>>>     Not that folks have been jumping all over this, but in case someone is
>>>>     curious, it triggered twice here today. For those two times, the value
>>>>     of mvm->pending_frames[sta_id] was 80 and 39, respectively.
>>>>
>>>> Sorry for the delay, I'm on vacation now with limited internet access.
>>>> But we'll take a look into this early next week at the latest.
>>>>
>>>> Thanks a lot for the detailed report!
>>>
>>> No worries, thanks for responding. I just wanted to ensure this wasn't
>>> dropped on the floor.
>>>
>>> BTW, a few more values of ->pending_frames[sta_id]:
>>>
>>> $ dmesg | grep "ret="
>>> [ 2334.308254] ret=39
>>> [ 7915.311828] ret=80
>>> [31602.317204] ret=41
>>> [32139.510993] ret=54
>>> [33292.917759] ret=96
>>>
>>> it seems to often happen around resume.
>>
>> This is still happening all the time in current -git.
> 
> Could you collect traces with trace-cmd, as explained in our wiki[1]?
> This will probably help point out the problem.  I know it's a bit
> difficult because it appears to happen randomly for you, but it's worth
> trying.

Sure I can, but honestly I'm a little puzzled that nobody else can
reproduce this, it happens every time I resume of switch access points.
Is anyone trying to reproduce this?

I'll have to recompile with iwlwifi tracing enabled, then I'll send a trace
when it happens.

-- 
Jens Axboe