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Message-ID: <52F4F01C.1070800@linux.vnet.ibm.com>
Date: Fri, 07 Feb 2014 09:39:24 -0500
From: "Jason J. Herne" <jjherne@...ux.vnet.ibm.com>
To: tj@...nel.org, linux-kernel@...r.kernel.org
Subject: Subject: Warning in workqueue.c
I've been able to reproduce the following warning using several kernel
versions on the S390 platform, including the latest master: 3.14-rc1
(38dbfb59d1175ef458d006556061adeaa8751b72).
[28718.212810] ------------[ cut here ]------------
[28718.212819] WARNING: at kernel/workqueue.c:2156
[28718.212822] Modules linked in: ipt_MASQUERADE iptable_nat nf_nat_ipv4
nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack
xt_CHECKSUM iptable_mangle bridge stp llc ip6table_filter ip6_tables
ebtable_nat ebtables iscsi_tcp libiscsi_tcp libiscsi
scsi_transport_iscsi tape_3590 qeth_l2 tape tape_class vhost_net tun
vhost macvtap macvlan lcs dasd_eckd_mod dasd_mod qeth ccwgroup zfcp
scsi_transport_fc scsi_tgt qdio dm_multipath [last unloaded: kvm]
[28718.212857] CPU: 2 PID: 20 Comm: kworker/3:0 Not tainted 3.14.0-rc1 #1
[28718.212862] task: 00000000f7b23260 ti: 00000000f7b2c000 task.ti:
00000000f7b2c000
[28718.212874] Krnl PSW : 0404c00180000000 000000000015b0be
(process_one_work+0x2e6/0x4c0)
[28718.212881] R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:0
PM:0 EA:3
Krnl GPRS: 0000000001727790 0000000000bc2a52 00000000f7f21900
0000000000b92500
[28718.212883] 0000000000b92500 0000000000105b24
0000000000000000 0000000000bc2a4e
[28718.212887] 0000000000000000 0000000084a2b500
0000000084a27000 0000000084a27018
[28718.212888] 00000000f7f21900 0000000000b92500
00000000f7b2fdd0 00000000f7b2fd70
[28718.212907] Krnl Code: 000000000015b0b2: 95001000 cli 0(%r1),0
000000000015b0b6: a774fece brc 7,15ae52
#000000000015b0ba: a7f40001 brc 15,15b0bc
>000000000015b0be: 92011000 mvi 0(%r1),1
000000000015b0c2: a7f4fec8 brc 15,15ae52
000000000015b0c6: e31003180004 lg %r1,792
000000000015b0cc: 58301024 l %r3,36(%r1)
000000000015b0d0: a73a0001 ahi %r3,1
[28718.212937] Call Trace:
[28718.212940] ([<000000000015b08c>] process_one_work+0x2b4/0x4c0)
[28718.212944] [<000000000015b858>] worker_thread+0x178/0x39c
[28718.212949] [<0000000000164652>] kthread+0x10e/0x128
[28718.212956] [<0000000000728c66>] kernel_thread_starter+0x6/0xc
[28718.212960] [<0000000000728c60>] kernel_thread_starter+0x0/0xc
[28718.212962] Last Breaking-Event-Address:
[28718.212965] [<000000000015b0ba>] process_one_work+0x2e2/0x4c0
[28718.212968] ---[ end trace 6d115577307998c2 ]---
The workload is:
2 processes onlining random cpus in a tight loop by using 'echo 1 >
/sys/bus/cpu.../online'
2 processes offlining random cpus in a tight loop by using 'echo 0 >
/sys/bus/cpu.../online'
Otherwise, fairly idle system. load average: 5.82, 6.27, 6.27
The machine has 10 processors.
The warning message some times hits within a few minutes on starting the
workload. Other times it takes several hours.
The particular spot in the code is:
/*
* Ensure we're on the correct CPU. DISASSOCIATED test is
* necessary to avoid spurious warnings from rescuers servicing the
* unbound or a disassociated pool.
*/
WARN_ON_ONCE(!(worker->flags & WORKER_UNBOUND) &&
!(pool->flags & POOL_DISASSOCIATED) &&
raw_smp_processor_id() != pool->cpu);
I'm not familiar with scheduling or work queuing internals so I'm not
sure how to further debug.
I would be happy to run tests and/or collect debugging data.
--
-- Jason J. Herne (jjherne@...ux.vnet.ibm.com)
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