[LU-15885] o2iblnd: RDMA_CM_EVENT_UNREACHABLE may be received after conn clean-up

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Labels: o2iblnd
• Severity: 3
• Assignee: Serguei Smirnov
• Reporter: Serguei Smirnov

Description

There's a scenario when IB port going down triggers the following assertion:

  case RDMA_CM_EVENT_UNREACHABLE:
                conn = cmid->context;
                LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
                        conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);

Because connection is already disconnected due to an earlier "RDMA Timeout".

Since it appears to be possible to get RDMA_CM_EVENT_UNREACHABLE after having decided to close the connection, this code should be changed.