On Wed, Nov 26, 2014 at 8:04 AM, Miao Xie <miaox@xxxxxxxxxxxxxx> wrote:
The increase/decrease of bio counter is on the I/O path, so we should use io_schedule() instead of schedule(), or the deadlock might be triggered by the pending I/O in the plug list. io_schedule() can help us because it will flush all the pending I/O before the task is going to sleep.
Can you please describe this deadlock in more detail? schedule() also triggers a flush of the plug list, and if that's no longer sufficient we can run into other problems (especially with preemption on).
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