From: Ming Lei <ming.lei@redhat.com>
To: Alban Browaeys <alban.browaeys@gmail.com>
Cc: Jens Axboe <axboe@fb.com>, linux-block@vger.kernel.org
Subject: Re: blk-mq + bfq: udevd hang on usb2 storages
Date: Sat, 2 Dec 2017 01:29:59 +0800 [thread overview]
Message-ID: <20171201172958.GA22528@ming.t460p> (raw)
In-Reply-To: <1512147869.8698.21.camel@gmail.com>
On Fri, Dec 01, 2017 at 06:04:29PM +0100, Alban Browaeys wrote:
> I initially reported as https://bugzilla.kernel.org/show_bug.cgi?id=198
> 023 .
>
> I have now bisected this issue to commit a6a252e6491443c1c1 "blk-mq-
> sched: decide how to handle flush rq via RQF_FLUSH_SEQ".
>
> This is with an USB stick Sandisk Cruzer (USB Version: 2.10) I
> regressed with.
> systemctl restart systemd-udevd restores sanity.
>From my investigation, looks the issue is in BFQ:
https://marc.info/?l=linux-block&m=151214241518562&w=2
Could you apply the attached debug patch, run your test and provide us the log?
Thanks,
Ming
next prev parent reply other threads:[~2017-12-01 17:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-01 17:04 blk-mq + bfq: udevd hang on usb2 storages Alban Browaeys
2017-12-01 17:29 ` Ming Lei [this message]
2017-12-04 10:57 ` Ming Lei
2017-12-07 18:04 ` Paolo Valente
2017-12-08 1:28 ` Ming Lei
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