Re: bug in tag handling in blk-mq?

[Jens Axboe]

On 5/8/18 10:42 AM, Mike Galbraith wrote:
> On Tue, 2018-05-08 at 08:55 -0600, Jens Axboe wrote:
>>
>> All the block debug files are empty...
> 
> Sigh.  Take 2, this time cat debug files, having turned block tracing
> off before doing anything else (so trace bits in dmesg.txt should end
> AT the stall).

OK, that's better. What I see from the traces:

- You have regular IO and some non-fs IO (from scsi_execute()). This mix
  may be key.

- sdd has nothing pending, yet has 6 active waitqueues.

I'm going to see if I can reproduce this. Paolo, what kind of attempts
to reproduce this have you done?

-- 
Jens Axboe