[LU-1908] Test failure on test suite racer: mount busy, vfscount=18

• Type: Bug
• Resolution: Cannot Reproduce
• Priority: Minor
• Affects Version/s: Lustre 2.3.0
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Maloo

Description

This issue was created by maloo for yujian <[e-mail]>

This issue relates to the following test suite run: https://maloo.whamcloud.com/test_sets/7944d89e-fcb3-11e1-b09c-52540035b04c.

Lustre Build: http://build.whamcloud.com/job/lustre-b2_3/17

After racer test_1 passed, the whole test hung at the cleanup phase:

Stopping /mnt/ost3 (opts:-f) on client-21
CMD: client-21 umount -d -f /mnt/ost3

Console log on client-21:

11:56:44:Lustre: DEBUG MARKER: grep -c /mnt/ost3' ' /proc/mounts
11:56:44:Lustre: DEBUG MARKER: umount -d -f /mnt/ost3
11:56:44:LustreError: 13768:0:(obd_mount.c:257:server_put_mount()) lustre-OST0002: mount busy, vfscount=18!
11:57:15:Lustre: 13784:0:(client.c:1917:ptlrpc_expire_one_request()) @@@ Request  sent has timed out for slow reply: [sent 1347389810/real 1347389810]  req@ffff88032a38e800 x1412838553052287/t0(0) o250->MGC10.10.4.20@tcp@10.10.4.20@tcp:26/25 lens 400/544 e 0 to 1 dl 1347389826 ref 1 fl Rpc:XN/0/ffffffff rc 0/-1
11:57:15:Lustre: 13784:0:(client.c:1917:ptlrpc_expire_one_request()) Skipped 2 previous similar messages
11:57:15:Lustre: Mount still busy with 18 refs after 30 secs.
11:57:46:Lustre: Mount still busy with 18 refs after 60 secs.
11:58:18:Lustre: Mount still busy with 18 refs after 90 secs.