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

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Date:   Fri, 12 Jan 2018 21:19:44 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "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>
CC:     "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>,
        "jianchao.w.wang@...cle.com" <jianchao.w.wang@...cle.com>
Subject: Re: [PATCHSET v5] blk-mq: reimplement timeout handling

On Fri, 2018-01-12 at 14:07 -0700, Jens Axboe wrote:
> You're really not making it easy for folks to run this :-)

My hope is that the ib_srp and ib_srpt patches will be accepted upstream soon.
As long as these are not upstream, anyone who wants to retrieve these patches
is welcome to clone https://github.com/bvanassche/linux/tree/block-scsi-for-next,
a kernel tree with all my pending patches.

> Do you have the matching blk-mq debugfs output for the device?

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.

Bart.
View attachment "blk-state" of type "text/plain" (46000 bytes)