[LU-8765] dead loop in ptlrpc_replay_next()

Related — Mon, 3 Sep 2018 08:11:59 +0000

I see there is a defect about imp_replay_cursor which can lead to ptlrpc_replay_next() run into a dead loop:

During replay, imp_replay_cursor moves to an open request A;
Client close the file, so that rq_replay of the A open request is cleared;
ptlrpc_replay_next() is called to continue replay, it calls ptlrpc_free_committed() to remove committed/closed request from replay/committed list, request A is removed from committed list; (The open request is still being held by the pending close request, so it's not freed);
ptlrpc_replay_next() then try to move imp_replay_cursor to next, but the next is itself now, dead loop;

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