[LU-8765] dead loop in ptlrpc_replay_next()

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.10.0
• Severity: 3
• Assignee: Niu Yawei (Inactive)
• Reporter: Niu Yawei (Inactive)

Description

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;