From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bart Van Assche <bart.vanassche@sandisk.com>
Subject: Re: dm + blk-mq soft lockup complaint
Date: Thu, 15 Jan 2015 16:55:11 +0100
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To: Mike Snitzer <snitzer@redhat.com>
Cc: Keith Busch <keith.busch@intel.com>, Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@infradead.org>, device-mapper development <dm-devel@redhat.com>, Jun'ichi Nomura <j-nomura@ce.jp.nec.com>, linux-scsi@vger.kernel.org
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On 01/15/15 16:44, Mike Snitzer wrote:
> How easily could you reproduce your SRP hang?  Did it happen every run
> or did it take multiple runs to see it?

Hello Mike,

This complaint was easy to trigger. It took less than one minute before
the soft lockup complaint appeared. The system did not hang after that
complaint appeared. Maybe this complaint means that a cond_resched()
call was missing from a loop ?

Bart.