Messages in this thread |  | | From | Ming Lei <> | Subject | [PATCH 0/2] blk-mq: fix oops caused by CPU hotplug | Date | Sun, 19 Apr 2015 23:32:44 +0800 |
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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
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