linux-kernel - Re: bfq/ext4 disk IO hangs forever on resume

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Message-ID: <6c2bd97a-455e-8078-9441-cb53a7f7fa60@kernel.dk>
Date:   Tue, 25 Jul 2017 08:47:43 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Jan Kara <jack@...e.cz>, Alex Xu <alex_y_xu@...oo.ca>
Cc:     linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
        Paolo Valente <paolo.valente@...aro.org>,
        linux-block@...r.kernel.org
Subject: Re: bfq/ext4 disk IO hangs forever on resume

On 07/25/2017 02:51 AM, Jan Kara wrote:
> Hello,
> 
> On Sun 25-06-17 23:07:56, Alex Xu wrote:
>> I get hangs when resuming when using bfq-mq with ext4 on 4.12-rc6+
>> (currently a4fd8b3accf43d407472e34403d4b0a4df5c0e71).
>>
>> Steps to reproduce:
>> 1. boot computer
>> 2. systemctl suspend
>> 3. wait few seconds
>> 4. press power button
>> 5. type "ls" into console or SSH or do anything that does disk IO
>>
>> Expected results:
>> Command is executed.
>>
>> Actual results:
>> Command hangs.
>>
>> lockdep has no comments, but sysrq-d shows that i_mutex_dir_key and
>> jbd2_handle are held by multiple processes, leading me to suspect that
>> ext4 is at least partially involved. [0]
> 
> Can you still reproduce this?

Can you try with this patch added:

http://git.kernel.dk/cgit/linux-block/commit/?h=for-linus&id=765e40b675a9566459ddcb8358ad16f3b8344bbe

-- 
Jens Axboe