linux-kernel - Re: block: WARN_ON_ONCE(ev->block <= 0) triggered in __disk_unblock

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Message-ID: <20120103183741.GE31746@google.com>
Date:	Tue, 3 Jan 2012 10:37:41 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Bart Van Assche <bvanassche@....org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Jens Axboe <jaxboe@...ionio.com>
Subject: Re: block: WARN_ON_ONCE(ev->block <= 0) triggered in
 __disk_unblock_events()

Hello,

On Sun, Jan 01, 2012 at 05:22:58PM +0000, Bart Van Assche wrote:
> In a workload that involves a lot of scsi_remove_hosts() calls (srp-ha
> patch set stress test) I get the call stack below after about 30 to 50
> iterations. Is this a known issue ? Does this indicate a race
> condition in the block layer ? I can trigger this issue not only with
> 3.2-rc7 but also with 3.1.6. I haven't tried any other kernel versions
> yet.
>
> ------------[ cut here ]------------
> WARNING: at block/genhd.c:1466 __disk_unblock_events+0xf5/0x110()

It's indicating that there were more disk_unblock_events() than
disk_block_events().  Hmmm... weird.  I'll prep a debug patch.

Thanks.

-- 
tejun
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