7f63b888c7
Previously, the aiotx task relied on the aio jobs in the queue to hold a reference on the socket. However, when the last job is completed, there is nothing left to hold a reference to the socket buffer lock used to check if the queue is empty. In addition, if the last job on the queue is cancelled, the task can run with no queued jobs holding a reference to the socket buffer lock the task uses to notice the queue is empty. Fix these races by holding an explicit reference on the socket when the task is queued and dropping that reference when the task completes. Reviewed by: np MFC after: 1 week Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D20539
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