On Wed, Oct 10, 2018 at 07:19:00PM +0900, Tetsuo Handa wrote:

On 2018/10/10 19:04, Jan Kara wrote:

quoted

Hi,

this patch series fixes oops and possible deadlocks as reported by syzbot [1]
[2]. The second patch in the series (from Tetsuo) fixes the oops, the remaining
patches are cleaning up the locking in the loop driver so that we can in the
end reasonably easily switch to rereading partitions without holding mutex
protecting the loop device.

I have lightly tested the patches by creating, deleting, and modifying loop
devices but if there's some more comprehensive loopback device testsuite, I
can try running it. Review is welcome!

Testing on linux-next by syzbot will be the most comprehensive. ;-)

Apart from that blktests has a loop category and I think it could also be
worthwhile to add the C reproducer from syzkaller to blktests.

Byte,
	Johannes
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Johannes Thumshirn                                        SUSE Labs 
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