[LU-7794] tgt_clients_data_init()) soaked-MDT0001: duplicate export for client generation 1

• Type: Bug
• Resolution: Duplicate
• Priority: Critical
• Affects Version/s: Lustre 2.8.0
• Labels: soak
• Severity: 3
• Assignee: Gregoire Pichon
• Reporter: Di Wang

Description

We saw this during DNE failover soak-test.

Lustre: 4374:0:(client.c:2063:ptlrpc_expire_one_request()) @@@ Request sent has timed out for slow reply: [sent 1455822992/real 1455822992]  req@ffff8807bba3b980 x1526529651962748/t0(0) o250->MGC192.168.1.108@o2ib10@0@lo:26/25 lens 520/544 e 0 to 1 dl 1455823038 ref 1 fl Rpc:XN/0/ffffffff rc 0/-1
Lustre: 4374:0:(client.c:2063:ptlrpc_expire_one_request()) Skipped 37 previous similar messages
LustreError: 8115:0:(tgt_lastrcvd.c:1464:tgt_clients_data_init()) soaked-MDT0001: duplicate export for client generation 3
LustreError: 8115:0:(obd_config.c:578:class_setup()) setup soaked-MDT0001 failed (-114)
LustreError: 8115:0:(obd_config.c:1666:class_config_llog_handler()) MGC192.168.1.108@o2ib10: cfg command failed: rc = -114
Lustre:    cmd=cf003 0:soaked-MDT0001  1:soaked-MDT0001_UUID  2:1  3:soaked-MDT0001-mdtlov  4:f  

And it cause the failover MDT can not be mounted on the new MDS. Similar as LU-7430, but no panic this time.

Issue Links

• duplicates: LU-15935 MDT mount fails with "duplicate generation for client export" during failover
• is related to: LU-7430 General protection fault: 0000 upon mounting MDT