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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Date:	Sat, 3 Dec 2011 10:37:54 -0500
From:	Miles Lane <miles.lane@...il.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.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):

Thanks!  The patch worked perfectly.

        Miles

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
>>
>
>
> Regards,
> Srivatsa S. Bhat
> IBM Linux Technology Center
>
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