Date:	Thu, 13 Feb 2014 11:02:34 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	jjherne@...ux.vnet.ibm.com
CC:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: Subject: Warning in workqueue.c

On 02/12/2014 11:18 PM, Jason J. Herne wrote:
> On 02/10/2014 06:17 PM, Tejun Heo wrote:
>> Hello,
>>
>> On Mon, Feb 10, 2014 at 10:32:11AM -0500, Jason J. Herne wrote:
>>> [  950.778485] XXX: worker->flags=0x1 pool->flags=0x0 cpu=6
>>> pool->cpu=2 rescue_wq=          (null)
>>> [  950.778488] XXX: last_unbind=-7 last_rebind=0
>>> last_rebound_clear=0 nr_exected_after_rebound_clear=0
>>> [  950.778492] XXX: cpus_allowed=2
>>> [  950.778495] XXX: cpus_allowed_after_rebinding=2
>>
>> So, everything looks kosher from workqueue side.  Weird.  cpus_allowed
>> is properly set and everything.  The worker just isn't running on the
>> cpu it's supposed to be on.  Can you please try the following?
> 
> 
> Thanks for the fast responses. Here is the output from the last patch:

I can't hit the bug. Could you give me more information to help me to reproduce the bug?
I think we need to use "git-bisect" to address the suspicious patch.

Thanks,
Lai

> 
> 
> [34437.173991] WARNING: at kernel/workqueue.c:2156
> [34437.173993] 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 qeth_l2 tape_3590 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]
> [34437.174030] CPU: 2 PID: 12 Comm: kworker/1:0 Not tainted 3.14.0-rc1 #1
> [34437.174034] task: 00000000f7c9e4c0 ti: 00000000f7cbc000 task.ti: 00000000f7cbc000
> [34437.174046] Krnl PSW : 0404c00180000000 000000000015b406 (process_one_work+0x61a/0x640)
> [34437.174051]            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: 000000007c325b00 0000000000bc2a52 00000000f7f52780 0000000000000001
> [34437.174057]            0000000000000000 0000000000000002 0000000000000001 0000000000bc2a4e
> [34437.174061]            0000000000000000 0000000084a13500 0000000084a0f000 0000000084a0f018
> [34437.174065]            00000000f7f52780 0000000000735d18 00000000f7cbfdd0 00000000f7cbfd58
> [34437.174085] Krnl Code: 000000000015b3fa: 92013000        mvi    0(%r3),1
>            000000000015b3fe: a7f4ff31        brc    15,15b260
>           #000000000015b402: a7f40001        brc    15,15b404
>           >000000000015b406: 92011000        mvi    0(%r1),1
>            000000000015b40a: a7f4fe84        brc    15,15b112
>            000000000015b40e: 41102018        la    %r1,24(%r2)
>            000000000015b412: e31020180020    cg    %r1,24(%r2)
>            000000000015b418: a784ff59        brc    8,15b2ca
> [34437.174115] Call Trace:
> [34437.174118] ([<000000000015b0e0>] process_one_work+0x2f4/0x640)
> [34437.174122]  [<000000000015ba0e>] worker_thread+0x19a/0x3c0
> [34437.174126]  [<0000000000164842>] kthread+0x10e/0x128
> [34437.174132]  [<0000000000728e56>] kernel_thread_starter+0x6/0xc
> [34437.174136]  [<0000000000728e50>] kernel_thread_starter+0x0/0xc
> [34437.174138] Last Breaking-Event-Address:
> [34437.174141]  [<000000000015b402>] process_one_work+0x616/0x640
> [34437.174144] ---[ end trace 52d8ee96597a2415 ]---
> [34437.174148] XXX: worker->flags=0x1 pool->flags=0x0 cpu=2 pool->cpu=1(1) rescue_wq=          (null)
> [34437.174152] XXX: last_unbind=-34 last_rebind=0 last_rebound_clear=0 nr_exected_after_rebound_clear=0
> [34437.174156] XXX: cpus_allowed=1
> [34437.174158] XXX: cpus_allowed_after_rebinding=1
> [34437.174161] BUG: scheduling while atomic: kworker/1:0/12/0x00000002
> [34437.174164] 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 qeth_l2 tape_3590 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]
> [34437.174194] CPU: 2 PID: 12 Comm: kworker/1:0 Tainted: G        W 3.14.0-rc1 #1
> [34437.174197]        00000000f7cbfb80 00000000f7cbfb90 0000000000000002 0000000000000000
>        00000000f7cbfc20 00000000f7cbfb98 00000000f7cbfb98 0000000000115f6a
>        0000000000000003 0000000000c4da00 000000000000000a 000000000000000a
>        00000000f7cbfbe0 00000000f7cbfb80 0000000000000000 0000000000000000
>        0000000000000000 0000000000115f6a 00000000f7cbfb80 00000000f7cbfbd0
> [34437.174273] Call Trace:
> [34437.174279] ([<0000000000115e5c>] show_trace+0x100/0x148)
> [34437.174282]  [<0000000000115f18>] show_stack+0x74/0xf4
> [34437.174288]  [<0000000000720a9c>] dump_stack+0x88/0xb8
> [34437.174291]  [<000000000071aa40>] __schedule_bug+0x78/0x90
> [34437.174295]  [<00000000007237e4>] __schedule+0xb8c/0xbac
> [34437.174299]  [<000000000015b21e>] process_one_work+0x432/0x640
> [34437.174302]  [<000000000015ba0e>] worker_thread+0x19a/0x3c0
> [34437.174306]  [<0000000000164842>] kthread+0x10e/0x128
> [34437.174309]  [<0000000000728e56>] kernel_thread_starter+0x6/0xc
> [34437.174313]  [<0000000000728e50>] kernel_thread_starter+0x0/0xc
> [34437.174317] XXX: after schedule(), cpu=2
> 
> 
> 
> 

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