[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <1429457566-15113-1-git-send-email-ming.lei@canonical.com>
Date: Sun, 19 Apr 2015 23:32:44 +0800
From: Ming Lei <ming.lei@...onical.com>
To: Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org
Cc: Christoph Hellwig <hch@....de>,
Dongsu Park <dongsu.park@...fitbricks.com>
Subject: [PATCH 0/2] blk-mq: fix oops caused by CPU hotplug
Hi Guys,
Dongsu Park reported[1] that kernel oops can be triggered easily by
CPU plug when there is pending I/O on virtio-scsi.
Turns out two problems exist and both can trigger oops by CPU plug:
- timeout handling vs CPU hotplug, especially unmapped hw queue tags
is still touched by timeout handler
- in case of shared tags, there is one bug about setting and checking
hctx->tags during CPU hotplug
The two patches fix the two problem, and in my virtio-scsi test
oops does disapper with the change.
[1], http://marc.info/?t=142926389200008&r=1&w=2
Thanks,
Ming Lei
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists