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Date:	Fri, 22 Jan 2010 11:24:42 +0800
From:	Xiaotian Feng <xtfeng@...il.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, Greg KH <gregkh@...e.de>
Subject: Re: [2.6.33-rc4] sysfs lockdep warnings on cpu hotplug

On Thu, Jan 21, 2010 at 11:53 PM, Heiko Carstens
<heiko.carstens@...ibm.com> wrote:
> Hi Eric,
>
> rumours are that you could be responsible for the following lockdep message:
>
> Happens on cpu hotplug on s390:

I can see the same warnings on x86_64

>
> =============================================
> [ INFO: possible recursive locking detected ]
> 2.6.33-rc4-00399-g24bc734 #1
> ---------------------------------------------
> bash/2576 is trying to acquire lock:
>  (s_active){++++.+}, at: [<000000000016c506>] sysfs_addrm_finish+0x5a/0xa8
>
> but task is already holding lock:
>  (s_active){++++.+}, at: [<000000000016c90c>] sysfs_get_active_two+0x64/0x88
>
> other info that might help us debug this:
> 5 locks held by bash/2576:
>  #0:  (&buffer->mutex){+.+.+.}, at: [<000000000016a912>] sysfs_write_file+0x4a/0x1a8
>  #1:  (s_active){++++.+}, at: [<000000000016c90c>] sysfs_get_active_two+0x64/0x88
>  #2:  (s_active){++++.+}, at: [<000000000016c8e6>] sysfs_get_active_two+0x3e/0x88
>  #3:  (cpu_add_remove_lock){+.+.+.}, at: [<00000000003dd318>] cpu_down+0x44/0x88
>  #4:  (cpu_hotplug.lock){+.+.+.}, at: [<0000000000056eee>] cpu_hotplug_begin+0x3e/0x74
>
> stack backtrace:
> CPU: 1 Not tainted 2.6.33-rc4-00399-g24bc734 #1
> Process bash (pid: 2576, task: 000000003f0e25d0, ksp: 000000003d9339d8)
> 000000003d9338b0 000000003d933830 0000000000000002 0000000000000000
>       000000003d9338d0 000000003d933848 000000003d933848 00000000003e4996
>       0000000000000000 0000000000000000 000000003f0e2cb8 0000000000835208
>       000000000000000d 000000000000000c 000000003d933898 0000000000000000
>       0000000000000000 00000000000172aa 000000003d933830 000000003d933870
> Call Trace:
> ([<00000000000171b2>] show_trace+0xee/0x144)
>  [<000000000008a1a0>] validate_chain+0xa2c/0x1100
>  [<000000000008ad84>] __lock_acquire+0x510/0xbfc
>  [<000000000008b51c>] lock_acquire+0xac/0xd4
>  [<000000000016bba8>] sysfs_deactivate+0x94/0x108
>  [<000000000016c506>] sysfs_addrm_finish+0x5a/0xa8
>  [<0000000000169f38>] sysfs_hash_and_remove+0x64/0x9c
>  [<000000000016dbae>] sysfs_remove_group+0x76/0x12c
>  [<00000000003dfaae>] smp_cpu_notify+0xae/0xc8
>  [<00000000003eb652>] notifier_call_chain+0x56/0x98
>  [<000000000007a1b2>] raw_notifier_call_chain+0x2a/0x3c
>  [<00000000003dd132>] _cpu_down+0x1aa/0x34c
>  [<00000000003dd356>] cpu_down+0x82/0x88
>  [<00000000003ddac0>] store_online+0x5c/0xc8
>  [<000000000016a9be>] sysfs_write_file+0xf6/0x1a8
>  [<00000000000ffd5c>] vfs_write+0xac/0x178
>  [<00000000000fff24>] SyS_write+0x58/0xa8
>  [<00000000000295b6>] sysc_noemu+0x10/0x16
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