[PATCH 0/1] nbd: fix dangling requests bug

[paul . clements]

This patch fixes a serious, but uncommon bug in nbd. This should probably
be considered for backport to one or more stable branches.

The bug occurs when there is heavy I/O going to the nbd device while, at the
same time, a failure (server, network) or manual disconnect of the nbd
connection occurs.

There is a small window between the time that the nbd_thread is stopped and the
socket is shutdown where requests can continue to be queued to nbd's
internal waiting_queue. When this happens, those requests are never completed
or freed.

The fix is to clear the waiting_queue on shutdown of the nbd device, in
the same way that the nbd request queue (queue_head) is already being cleared.

--
Paul
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