[Lustre-discuss] Question about sleeping processes

[Michael Schwartzkopff]

Hi,

my system load shows that quite a number of processes are waiting. ps shows me 
the same number of processes in state D (uniterruptable sleep). All processes 
are ll_mdt_NN, where NN is a decimal number.

In the logs I find the entry ( see log below).

My questions are:
What causes the problem?
Can I kill the "hanging" processes?

System: Luste 1.8.1 on RHEL5.3

thanks for any hints.

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Oct  5 10:28:03 sosmds2 kernel: Lustre: 0:0:(watchdog.c:181:lcw_cb()) Watchdog 
triggered for pid 28402: it was inactive for 200.00s
Oct  5 10:28:03 sosmds2 kernel: ll_mdt_35     D ffff81000100c980     0 28402      
1         28403 28388 (L-TLB)
Oct  5 10:28:03 sosmds2 kernel:  ffff81041c723810 0000000000000046 
0000000000000000 7fffffffffffffff
Oct  5 10:28:03 sosmds2 kernel:  ffff81041c7237d0 0000000000000001 
ffff81022f3e60c0 ffff81022f12e080
Oct  5 10:28:03 sosmds2 kernel:  000177b2feff847c 00000000000014df 
ffff81022f3e62a8 000000010000028f
Oct  5 10:28:03 sosmds2 kernel: Call Trace:
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff8008a3ef>] 
default_wake_function+0x0/0xe
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff885b1b26>] 
:libcfs:lbug_with_loc+0xc6/0xd0
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff885b9c70>] 
:libcfs:tracefile_init+0x0/0x110
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff88712218>] 
:ptlrpc:lustre_shrink_reply_v2+0xa8/0x240
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff889ec529>] 
:mds:mds_getattr_lock+0xc59/0xce0
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff88710ea4>] 
:ptlrpc:lustre_msg_add_version+0x34/0x110
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff88602923>] :lnet:lnet_ni_send+0x93/0xd0
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff88604d23>] :lnet:lnet_send+0x973/0x9a0
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff889e6fca>] 
:mds:fixup_handle_for_resent_req+0x5a/0x2c0
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff889f2a76>] 
:mds:mds_intent_policy+0x636/0xc10
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff886d36f6>] 
:ptlrpc:ldlm_resource_putref+0x1b6/0x3a0
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff886d0d46>] 
:ptlrpc:ldlm_lock_enqueue+0x186/0xb30
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff886ecacf>] 
:ptlrpc:ldlm_export_lock_get+0x6f/0xe0
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff8864fe48>] 
:obdclass:lustre_hash_add+0x218/0x2e0
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff886f5530>] 
:ptlrpc:ldlm_server_blocking_ast+0x0/0x83d
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff886f3669>] 
:ptlrpc:ldlm_handle_enqueue+0xc19/0x1210
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff889f0630>] 
:mds:mds_handle+0x4080/0x4cb0
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff885e0047>] 
:lvfs:lprocfs_counter_sub+0x57/0x90
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff80148d4f>] __next_cpu+0x19/0x28
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff88715a15>] 
:ptlrpc:lustre_msg_get_conn_cnt+0x35/0xf0
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff80089d89>] enqueue_task+0x41/0x56
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff8871a72d>] 
:ptlrpc:ptlrpc_check_req+0x1d/0x110
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff8871ce67>] 
:ptlrpc:ptlrpc_server_handle_request+0xa97/0x1160
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff8003dc3f>] lock_timer_base+0x1b/0x3c
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff80088819>] __wake_up_common+0x3e/0x68
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff88720908>] 
:ptlrpc:ptlrpc_main+0x1218/0x13e0
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff8008a3ef>] 
default_wake_function+0x0/0xe
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff800b48dd>] 
audit_syscall_exit+0x327/0x342
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff8005dfb1>] child_rip+0xa/0x11
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff8871f6f0>] 
:ptlrpc:ptlrpc_main+0x0/0x13e0
Oct  5 10:28:03 sosmds2 kernel:  [<ffffffff8005dfa7>] child_rip+0x0/0x11


-- 
Dr. Michael Schwartzkopff
MultiNET Services GmbH
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