linux-kernel - Re: [PATCHSET v5] blk-mq: reimplement timeout handling

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Date:   Sun, 14 Jan 2018 23:45:04 +0800
From:   Ming Lei <tom.leiming@...il.com>
To:     "jianchao.wang" <jianchao.w.wang@...cle.com>
Cc:     Bart Van Assche <Bart.VanAssche@....com>,
        "jbacik@...com" <jbacik@...com>, "tj@...nel.org" <tj@...nel.org>,
        "jack@...e.cz" <jack@...e.cz>, "clm@...com" <clm@...com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "kernel-team@...com" <kernel-team@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>
Subject: Re: [PATCHSET v5] blk-mq: reimplement timeout handling

On Sun, Jan 14, 2018 at 11:12 PM, jianchao.wang
<jianchao.w.wang@...cle.com> wrote:
>
>
> On 01/13/2018 05:19 AM, Bart Van Assche wrote:
>> Sorry but I only retrieved the blk-mq debugfs several minutes after the hang
>> started so I'm not sure the state information is relevant. Anyway, I have attached
>> it to this e-mail. The most remarkable part is the following:
>>
>> ./000000009ddfa913/requeue_list:000000009646711c {.op=READ, .state=idle, gen=0x1
>> 18, abort_gen=0x0, .cmd_flags=, .rq_flags=SORTED|1|SOFTBARRIER|IO_STAT, complete
>> =0, .tag=-1, .internal_tag=217}
>>
>> The hexadecimal number at the start is the request_queue pointer (I modified the
>> blk-mq-debugfs code such that queues are registered with there address just after
>> creation and until a name is assigned). This is a dm-mpath queue.
>
> There seems to be something wrong in hctx->nr_active.

Then looks it is same with the issue I saw during starting multipathd, and the
following patch should fix that, if there isn't other issue.

        https://marc.info/?l=linux-block&m=151586577400558&w=2

-- 
Ming Lei