[LU-14594] reply to the original RPC can land to the resent RPC reply buffer

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.15.0
• Severity: 3
• Assignee: Vitaly Fertman
• Reporter: Vitaly Fertman

Description

whereas the server is able to filter by the connection ID, and drop late coming RPCs of previous connections, it does not work for replies. At the same time, this is a problem in some cases and we have to invent another fix each time.
one of the last cases was a late came enqueue resent which was handled as a new req (original lock was already cancelled) and was sent back with AST_SENT flag, as client does not wait for this reply anymore (the reply on the original RPC matched), it led to the eviction.