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From: Bart Van Assche <bart.vanassche@sandisk.com>
To: Junichi Nomura <j-nomura@ce.jp.nec.com>,
	Mike Snitzer <snitzer@redhat.com>
Cc: device-mapper development <dm-devel@redhat.com>
Subject: Re: v4.3-rc2 dm-mq bug
Date: Fri, 25 Sep 2015 08:37:26 -0700	[thread overview]
Message-ID: <56056A36.8060900@sandisk.com> (raw)
In-Reply-To: <20150925003755.GA5984@xzibit.linux.bs1.fc.nec.co.jp>

On 09/24/2015 05:42 PM, Junichi Nomura wrote:
> Since __dm_destroy() depends on monotonic decrease of md->holders,
> assertion check of !DMF_FREEING in dm_get() is a valid protection
> from use-after-free.  If we are to remove the check, __dm_destroy()
> should be changed to cope with the situation.
>
> I'm curious why there were pending I/Os after DMF_FEEING set.
> Can this problem be reproducible with non dm-mq setup or older kernels?
> How did you remove the dm device in your testing?

Hello Junichi,

Thanks for stepping in.

Sorry but I do not know whether or not this problem is reproducible 
without dm-mq or with older kernels.

The dm device was removed via the command "dmsetup remove_all".

Bart.

  parent reply	other threads:[~2015-09-25 15:37 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-24 19:09 v4.3-rc2 dm-mq bug Bart Van Assche
2015-09-24 21:18 ` Mike Snitzer
2015-09-24 21:27   ` Bart Van Assche
2015-09-24 23:01     ` Mike Snitzer
2015-09-25 15:34       ` Bart Van Assche
2015-09-25 18:49         ` Mike Snitzer
2015-09-25  0:37   ` Junichi Nomura
2015-09-25  2:13     ` Mike Snitzer
2015-09-25 15:37     ` Bart Van Assche [this message]
2015-09-30  0:42       ` Junichi Nomura
2015-09-30  2:54         ` Bart Van Assche

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