[LU-5259] request gets stuck in UNREGISTERING phase

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.6.0
• Labels: HB patch
• Severity: 3
• Assignee: Jodi Levi (Inactive)
• Reporter: Andriy Skulysh

Description

After landing LU-5073 request can get stuck in following state
crash> ptlrpc_request.rq_receiving_reply,rq_req_unlink,rq_reply_unlink,rq_net_err,rq_timedout,rq_status,rq_bulk,rq_waiting,rq_resend,rq_xid,rq_phase 0xffff8807d68e7c00
rq_receiving_reply = 0
rq_req_unlink = 0
rq_reply_unlink = 0
rq_net_err = 0
rq_timedout = 0
rq_status = -11
rq_bulk = 0xffff881035e32000
rq_waiting = 0
rq_resend = 1
rq_xid = 1471081167901408
rq_phase = RQ_PHASE_UNREGISTERING

It is needed to call ptlrpc_unregister_bulk() to become ptlrpc_client_bulk_active() equal to 0

Issue Links

• is duplicated by: LU-2522 conf-sanity test_23b timed out during mount: RPCs in "Unregistering" phase found
• is related to: LU-5341 Intermittent hangs waiting for RPCs in unregistering phase to timeout
• is related to: LU-5267 Document ptlrpc state machine
• is related to: LU-5073 lustre don't able to unload modules in conf-sanity 31.