[LU-1336] OSS GPF at ptlrpc_send_reply+0x470

• Type: Bug
• Resolution: Duplicate
• Priority: Critical
• Affects Version/s: Lustre 2.1.0
• Environment: https://github.com/chaos/lustre/commits/2.1.0-24chaos
• Severity: 3
• Assignee: Zhenyu Xu
• Reporter: Ned Bass (Inactive)

Description

Back trace looks like this:

machine_kexec
crash_kexec
oops_end
die
do_general_protection
general_protection
[exception RIP: ptlrpc_send_replay+1136]
ptlrpc_send_error
target_send_replay_msg
target_send_reply
ost_handle
ptlrpc_main
kernel_thread

That RIP resolves to lustre/ptlrpc/niobuf.c:436 which in our tree is here:

434         /* There may be no rq_export during failover */
435 
436         if (unlikely(req->rq_export && req->rq_export->exp_obd &&
437                      req->rq_export->exp_obd->obd_fail)) { 
438                 /* Failed obd's only send ENODEV */
439                 req->rq_type = PTL_RPC_MSG_ERR;
440                 req->rq_status = -ENODEV;
441                 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
442                        req->rq_export->exp_obd->obd_minor);
443         }

Server was handling many client reconnects, under similar conditions as reported in LU-1085, LU-1092, LU-1093, and LU-1094.