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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/
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