linux-kernel - Re: bug in tag handling in blk-mq?

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Message-ID: <f04636df-3f97-6c16-f37b-d407e062b9e5@kernel.dk>
Date:   Tue, 8 May 2018 15:19:23 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Mike Galbraith <efault@....de>,
        Paolo Valente <paolo.valente@...aro.org>
Cc:     Christoph Hellwig <hch@....de>,
        linux-block <linux-block@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Oleksandr Natalenko <oleksandr@...alenko.name>
Subject: Re: bug in tag handling in blk-mq?

On 5/8/18 2:37 PM, Jens Axboe wrote:
> 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?

No luck so far. Out of the patches you referenced, I can only find the
shallow depth change, since that's in the parent of this email. Can
you send those as well?

Perhaps also expand a bit on exactly what you are running. File system,
mount options, etc.

-- 
Jens Axboe