linux-kernel - Re: [PATCH v1] blk-mq: free hctx->ctxs in queue's release handler

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Message-ID: <CACVXFVPCfjFzX=g5M-=6N0qAYYgTV0FP_sT_7DWaAse9gkYv5A@mail.gmail.com>
Date:	Tue, 9 Jun 2015 17:28:44 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Christoph Hellwig <hch@...radead.org>, NeilBrown <neilb@...e.de>,
	Stefan Seyfried <stefan.seyfried@...glemail.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] blk-mq: free hctx->ctxs in queue's release handler

Hi Jens,

Could you consider this patch for v4.1?

     http://marc.info/?l=linux-kernel&m=143342792910832&w=2

The issue is one obvious use-after-free and can be reproduced easily
via 'sudo modprobe loop;sleep 1;sudo rmmod loop' on linus tree:

      http://kernel.ubuntu.com/~ming/block/bug/4.1-rc7-blk-mq-oops.txt


Thanks,
Ming Lei
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