[LU-4359] 1.8.9 clients has endless bulk IO timeouts with 2.4.1 servers

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Affects Version/s: Lustre 2.4.1
• Environment: RHEL6.4/distro OFED/1.8.9 clients/2.4.1 servers
• Severity: 3
• Assignee: Niu Yawei (Inactive)
• Reporter: Blake Caldwell

Description

We have 2 separate 1.8.9 clients that have processes hung in the D state with the clients endlessly looping from FULL to DISCONN and then reestablishing connectivity. One appears to be looping on a Bulk IO write to a stale file handle (10.36.202.142@o2ib) and the other appears to be a BULK IO read from a kiblnd failure (10.36.202.138@o2ib). The timeouts affect filesystem availability, but other activities proceed in between these disconnections.

Just yesterday we identified 2 bad IB cables with high symbol error rates in our fabric that have since been disconnected. They were likely the cause for at least one of the issues.

server logs relevant to 10.36.202.138@o2ib issue:
Dec 8 12:11:52 atlas-oss3b4 kernel: [1032387.863173] Lustre: atlas2-OST009b: Client 3b57a9ed-bec6-9b0d-7da8-04d696e1a7f2 (at 10.36.202.138@o2ib) refused reconnection, still busy with 1 active RPCs
Dec 8 12:11:52 atlas-oss3b4 kernel: [1032387.919690] LustreError: 11590:0:(ldlm_lib.c:2711:target_bulk_io()) @@@ Reconnect on bulk PUT req@ffff880761cd2800 x1453425689933409/t0(0) o3->3b57a9ed-bec6-9b0d-7da8-04d696e1a7f2@10.36.202.138@o2ib:0/0 lens 448/432 e 0 to 0 dl 1386523292 ref 1 fl Interpret:/2/0 rc 0/0
Dec 8 12:11:52 atlas-oss3b4 kernel: [1032388.030434] Lustre: atlas2-OST009b: Bulk IO read error with 3b57a9ed-bec6-9b0d-7da8-04d696e1a7f2 (at 10.36.202.138@o2ib), client will retry: rc -110

client log on 10.36.202.138@o2ib:
Dec 8 12:11:51 dtn04.ccs.ornl.gov kernel: LustreError: 24615:0:(events.c:199:client_bulk_callback()) event type 1, status -103, desc ffff880499288000
Dec 8 12:11:52 dtn04.ccs.ornl.gov kernel: Lustre: 24622:0:(client.c:1529:ptlrpc_expire_one_request()) @@@ Request x1453425689933409 sent from atlas2-OST009b-osc-ffff880c392f9400 to NID 10.36.225.185@o2ib 19s ago has failed due to network error (567s prior to deadline).
Dec 8 12:11:52 dtn04.ccs.ornl.gov kernel: Lustre: 24622:0:(client.c:1529:ptlrpc_expire_one_request()) Skipped 7 previous similar messages
Dec 8 12:11:52 dtn04.ccs.ornl.gov kernel: Lustre: atlas2-OST009b-osc-ffff880c392f9400: Connection to service atlas2-OST009b via nid 10.36.225.185@o2ib was lost; in progress operations using this service will wait for recovery to complete.
Dec 8 12:11:52 dtn04.ccs.ornl.gov kernel: Lustre: Skipped 7 previous similar messages
Dec 8 12:11:52 dtn04.ccs.ornl.gov kernel: LustreError: 11-0: an error occurred while communicating with 10.36.225.185@o2ib. The ost_connect operation failed with -16

lctl dk output:
00000100:00080000:9:1386522391.428708:0:24622:0:(client.c:1392:ptlrpc_check_set()) resend bulk old x1453425689698153 new x1453425689814678
00000100:02000400:4:1386522391.428708:0:24623:0:(import.c:1016:ptlrpc_connect_interpret()) Server atlas2-OST009b_UUID version (2.4.1.0) is much newer than client version (1.8.9)
00000800:00000100:8:1386522411.140346:0:1644:0:(o2iblnd_cb.c:1813:kiblnd_close_conn_locked()) Closing conn to 10.36.225.185@o2ib: error 0(waiting)
00000100:00020000:6:1386522411.140744:0:24615:0:(events.c:199:client_bulk_callback()) event type 1, status -103, desc ffff880499288000
00000100:00000400:3:1386522411.151303:0:24622:0:(client.c:1529:ptlrpc_expire_one_request()) @@@ Request x1453425689814678 sent from atlas2-OST009b-osc-ffff880c392f9400 to NID 10.36.225.185@o2ib 20s ago has failed due to network error (567s prior to deadline).

server logs relevant to 10.36.202.142@o2ib issue:
Dec 8 09:27:15 atlas-oss4h1 kernel: [1022525.123761] LustreError: 113676:0:(ldlm_lib.c:2722:target_bulk_io()) @@@ network error on bulk GET 0(1048576) req@ffff880ff253d000 x145343054
1439222/t0(0) o4->10c57078-ce10-72c6-b97d-e7c9a32a240c@10.36.202.142@o2ib:0/0 lens 448/448 e 0 to 0 dl 1386513410 ref 1 fl Interpret:/2/0 rc 0/0
Dec 8 09:27:15 atlas-oss4h1 kernel: [1022525.123900] Lustre: atlas2-OST03e0: Bulk IO write error with 10c57078-ce10-72c6-b97d-e7c9a32a240c (at 10.36.202.142@o2ib), client will retry:
rc -110

client logs from 10.36.202.142@o2ib:
Dec 8 09:26:50 dtn-sch01.ccs.ornl.gov kernel: Lustre: atlas2-OST03e0-osc-ffff881039813c00: Connection to service atlas2-OST03e0 via nid 10.36.226.48@o2ib was lost; in progress operati
ons using this service will wait for recovery to complete.
Dec 8 09:26:50 dtn-sch01.ccs.ornl.gov kernel: Lustre: Skipped 39 previous similar messages
Dec 8 09:26:50 dtn-sch01.ccs.ornl.gov kernel: Lustre: atlas2-OST03e0-osc-ffff881039813c00: Connection restored to service atlas2-OST03e0 using nid 10.36.226.48@o2ib.
Dec 8 09:26:50 dtn-sch01.ccs.ornl.gov kernel: Lustre: Skipped 41 previous similar messages

The lctl dk output is less revealing for this case, but I will attach it. What flags are desirable for getting more relevant information?

From the OS, if I try to kill the process or stat the inode, I see:
00000080:00020000:3:1386519720.291103:0:16284:0:(file.c:3348:ll_inode_revalidate_fini()) failure -116 inode 144117425485470173

[root@dtn-sch01 ~]# fuser -k -m /lustre/atlas2
Cannot stat file /proc/975/fd/25: Stale file handle
[root@dtn-sch01 ~]# ls -l /proc/975/fd/25
l-wx------ 1 cfuson ccsstaff 64 Dec 7 22:46 /proc/975/fd/25 -> /lustre/atlas1/stf007/scratch/cfuson/TestDir/SubDir2/13G-3.tar
[root@dtn-sch01 ~]#

Issue Links

• is related to: LU-793 Reconnections should not be refused when there is a request in progress from this client.