[LU-1433] thread hangs on __d_lookup()

• Type: Bug
• Resolution: Cannot Reproduce
• Priority: Minor
• Affects Version/s: Lustre 1.8.6
• Severity: 3
• Assignee: Hongchao Zhang
• Reporter: Shuichi Ihara (Inactive)

Description

at the our customer site, we saw a thread hangs on MDS with the normal operation.

May 21 12:58:00 ALPL506 kernel: Call Trace:
May 21 12:58:00 ALPL506 kernel:  [<ffffffff80009852>] __d_lookup+0xb0/0xff
May 21 12:58:00 ALPL506 kernel:  [<ffffffff80063c4f>] __mutex_lock_slowpath+0x60/0x9b
May 21 12:58:00 ALPL506 kernel:  [<ffffffff80063c99>] .text.lock.mutex+0xf/0x14
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88c9ffd7>] :mds:mds_get_md+0x47/0x1c0
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88ca03ee>] :mds:mds_pack_md+0x29e/0x370
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88ca06df>] :mds:mds_getattr_internal+0x21f/0x840
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88ca3ad5>] :mds:mds_getattr_lock+0xab5/0xc90
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88c9edda>] :mds:fixup_handle_for_resent_req+0x5a/0x2c0
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88ca9d83>] :mds:mds_intent_policy+0x623/0xc20
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88944270>] :ptlrpc:ldlm_resource_putref_internal+0x230/0x460
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88941eb6>] :ptlrpc:ldlm_lock_enqueue+0x186/0xb20
May 21 12:58:00 ALPL506 kernel:  [<ffffffff8893e7fd>] :ptlrpc:ldlm_lock_create+0x9bd/0x9f0
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88966870>] :ptlrpc:ldlm_server_blocking_ast+0x0/0x83d
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88963b39>] :ptlrpc:ldlm_handle_enqueue+0xc09/0x1210
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88ca8b30>] :mds:mds_handle+0x40e0/0x4d10
May 21 12:58:00 ALPL506 kernel:  [<ffffffff800774ed>] smp_send_reschedule+0x4e/0x53
May 21 12:58:00 ALPL506 kernel:  [<ffffffff8008ddcd>] enqueue_task+0x41/0x56
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88987d55>] :ptlrpc:lustre_msg_get_conn_cnt+0x35/0xf0
May 21 12:58:00 ALPL506 kernel:  [<ffffffff889916d9>] :ptlrpc:ptlrpc_server_handle_request+0x989/0xe00
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88991e35>] :ptlrpc:ptlrpc_wait_event+0x2e5/0x310
May 21 12:58:00 ALPL506 kernel:  [<ffffffff8008c85d>] __wake_up_common+0x3e/0x68
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88992dc6>] :ptlrpc:ptlrpc_main+0xf66/0x1120
May 21 12:58:00 ALPL506 kernel:  [<ffffffff8005dfb1>] child_rip+0xa/0x11
May 21 12:58:00 ALPL506 kernel:  [<ffffffff88991e60>] :ptlrpc:ptlrpc_main+0x0/0x1120
May 21 12:58:00 ALPL506 kernel:  [<ffffffff8005dfa7>] child_rip+0x0/0x11

Issue Links

• Trackbacks: Lustre 1.8.x known issues tracker While testing against Lustre b18 branch, we would hit known bugs which were already reported in Lustre Bugzilla https://bugzilla.lustre.org/. In order to move away from relying on Bugzilla, we would create a JIRA