[LU-4408] parallel-scale test statahead hung

• Type: Bug
• Resolution: Duplicate
• Priority: Minor
• Affects Version/s: Lustre 2.4.2
• Labels: yuc2 zfs
• Environment: Lustre build: http://build.whamcloud.com/job/lustre-b2_4/69/ (2.4.2 RC1); Distro/Arch: RHEL6.4/x86_64; FSTYPE=zfs
• Severity: 3
• Assignee: WC Triage
• Reporter: Jian Yu

Description

parallel-scale test statahead hung as follows:

21:40:04:Lustre: DEBUG MARKER: == parallel-scale test statahead: statahead test, multiple clients == 20:42:53 (1387514573)
21:40:04:INFO: task mdsrate:29927 blocked for more than 120 seconds.
21:40:04:"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
21:40:04:mdsrate       D 0000000000000001     0 29927  29924 0x00000080
21:40:04: ffff880037011dc8 0000000000000082 ffff880037011d58 ffffffff81065c75
21:40:04: 0000001037011d48 ffff880037478aa0 ffff880037478aa0 ffff880037478aa0
21:40:04: ffff880037479058 ffff880037011fd8 000000000000fb88 ffff880037479058
21:40:04:Call Trace:
21:40:04: [<ffffffff81065c75>] ? enqueue_entity+0x125/0x410
21:40:04: [<ffffffff811a2100>] ? mntput_no_expire+0x30/0x110
21:40:04: [<ffffffff8150f81e>] __mutex_lock_slowpath+0x13e/0x180
21:40:04: [<ffffffff8150f6bb>] mutex_lock+0x2b/0x50
21:40:04: [<ffffffff8118ebe0>] lookup_create+0x30/0xd0
21:40:04: [<ffffffff81192639>] sys_mknodat+0x89/0x2a0
21:40:04: [<ffffffff810dc937>] ? audit_syscall_entry+0x1d7/0x200
21:40:04: [<ffffffff8119286a>] sys_mknod+0x1a/0x20
21:40:04: [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b

Maloo report:
https://maloo.whamcloud.com/test_sets/af2a5632-6981-11e3-aabe-52540035b04c

Issue Links

• duplicates: LU-4427 performance-sanity test_6: mdsrate hung (sys_mknod)