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

[Luca Coelho <luca@coelho.fi>]

On Fri, 2017-03-10 at 08:23 -0700, Jens Axboe wrote:
> 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.

Are you using 4.11-rc1? Or linus' master? Or...?

--
Luca.