linux-kernel - Re: [PATCH 3/3] blk-mq: Fix the queue freezing mechanism

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Message-ID: <20150924225619.GA27791@htj.duckdns.org>
Date:	Thu, 24 Sep 2015 18:56:19 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Bart Van Assche <bart.vanassche@...disk.com>
Cc:	Ming Lei <tom.leiming@...il.com>, Jens Axboe <axboe@...com>,
	Christoph Hellwig <hch@....de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Akinobu Mita <akinobu.mita@...il.com>
Subject: Re: [PATCH 3/3] blk-mq: Fix the queue freezing mechanism

Hello, Bart.

On Thu, Sep 24, 2015 at 03:54:18PM -0700, Bart Van Assche wrote:
> Sorry that I had not yet made this clear but I agreed with the analysis in
> your two most recent e-mails. I think I have found the cause of the loop:
> for one or another reason the scsi_dh_alua driver was not loaded
> automatically. I think that caused the SCSI core to return a retryable error
> code for reads and writes sent over paths in the SCSI ALUA state "standby"
> instead of a non-retryable error code and that that caused the dm-mpath
> driver to enter an infinite loop. Loading the scsi_dh_alua driver resolved
> the infinite loop. Anyway, thank you for the feedback.

Great!  I think we still probably wanna fix the kill/reinit race tho.

Thanks.

-- 
tejun
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