linux-kernel - Re: 3.2.0-rc4+ (Linus GIT af968e29acd91ebeb4224e899202c46c93171ecd) -- Freezing of tasks failed after 20.01 seconds (1 tasks refusing to freeze, wq

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Message-ID: <4EDA4C62.6050507@linux.vnet.ibm.com>
Date:	Sat, 03 Dec 2011 21:50:50 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Miles Lane <miles.lane@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Tejun Heo <tj@...nel.org>,
	Linux PM mailing list <linux-pm@...r.kernel.org>
Subject: Re: 3.2.0-rc4+ (Linus GIT af968e29acd91ebeb4224e899202c46c93171ecd)
 -- Freezing of tasks failed after 20.01 seconds (1 tasks refusing to freeze,
 wq_busy=0):

On 12/03/2011 09:07 PM, Miles Lane wrote:

> Thanks!  The patch worked perfectly.
> 
>         Miles


Thanks a lot for testing Miles!

Regards,
Srivatsa S. Bhat

> 
> On Sat, Dec 3, 2011 at 1:55 AM, Srivatsa S. Bhat
> <srivatsa.bhat@...ux.vnet.ibm.com> wrote:
>> On 12/03/2011 09:22 AM, Miles Lane wrote:
>>
>>> While reading a file in sysfs, I suspended tried to suspend the machine and got:
>>>
>>> [ 1058.644957] PM: Syncing filesystems ... done.
>>> [ 1059.670167] Freezing user space processes ...
>>> [ 1079.681175] Freezing of tasks failed after 20.01 seconds (1 tasks
>>> refusing to freeze, wq_busy=0):
>>> [ 1079.682077] head            D ffff88013a753680  5328  9761   9402 0x00800004
>>> [ 1079.682086]  ffff88011b15fd28 0000000000000046 0000000000000006
>>> ffffffff8160d020
>>> [ 1079.682095]  ffff880100000000 ffff88013a7532d0 ffff88011b15ffd8
>>> ffff88011b15ffd8
>>> [ 1079.682102]  0000000000010bc0 ffff88013a7532d0 ffffffff81372d96
>>> 000000013a7532d0
>>> [ 1079.682110] Call Trace:
>>> [ 1079.682120]  [<ffffffff81372d96>] ? __mutex_lock_common+0x26e/0x41e
>>> [ 1079.682126]  [<ffffffff8137241a>] schedule+0x55/0x57
>>> [ 1079.682131]  [<ffffffff81372dbf>] __mutex_lock_common+0x297/0x41e
>>> [ 1079.682137]  [<ffffffff810c675d>] ? lock_memory_hotplug+0x20/0x22
>>> [ 1079.682142]  [<ffffffff810c675d>] ? lock_memory_hotplug+0x20/0x22
>>> [ 1079.682149]  [<ffffffff8137302d>] mutex_lock_nested+0x36/0x3b
>>> [ 1079.682153]  [<ffffffff810c675d>] lock_memory_hotplug+0x20/0x22
>>
>>
>>                                        ^^^^^^^^^^^^^^^^^^
>> Wow! There, Tejun, did you see that? That is just what we fixed in
>> https://lkml.org/lkml/2011/11/21/334 !! :-)
>>
>> But since Rafael kept it for the next merge window, we hit this failure
>> in 3.2-rc4.
>>
>> Well, atleast for once I am feeling extremely happy that we *actually*
>> fixed a problem _before_ hitting it! :-)
>>
>> Miles, thanks for the report. Can you please try the patch given in the
>> above link?
>>
>>> [ 1079.682160]  [<ffffffff810c53e7>] show_slab_objects+0xfc/0x1e5
>>> [ 1079.682166]  [<ffffffff810c550e>] partial_show+0xe/0x10
>>> [ 1079.682171]  [<ffffffff810c23b7>] slab_attr_show+0x1d/0x21
>>> [ 1079.682177]  [<ffffffff811235c9>] sysfs_read_file+0xb7/0x13c
>>> [ 1079.682183]  [<ffffffff810ccdd3>] vfs_read+0xa0/0xc7
>>> [ 1079.682188]  [<ffffffff810ce0d3>] ? fget_light+0x35/0x97
>>> [ 1079.682194]  [<ffffffff810cce3f>] sys_read+0x45/0x69
>>> [ 1079.682199]  [<ffffffff81378d3b>] system_call_fastpath+0x16/0x1b
>>>
>>
>>


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