linux-kernel - Re: 2.6.33-rc3 -- INFO: possible recursive locking -- (s_active){++++.+}, at: [<c10d2941>] sysfs_hash_and

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Date:	Wed, 13 Jan 2010 21:47:11 -0500
From:	Miles Lane <miles.lane@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Américo Wang <xiyou.wangcong@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Arjan van de Ven <arjan@...radead.org>,
	Tejun Heo <tj@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: 2.6.33-rc3 -- INFO: possible recursive locking -- 
	(s_active){++++.+}, at: [<c10d2941>] sysfs_hash_and_remove+0x3d/0x4f

Hmm.  I tried your patch applied to a clean 2.6.33-rc4 tree, and used
the same .config file.  This time the INFO looks a lot like my
original bug report.  Weird.  Maybe I am doing something wrong!

[  291.124830] =============================================
[  291.124837] [ INFO: possible recursive locking detected ]
[  291.124846] 2.6.33-rc4 #3
[  291.124851] ---------------------------------------------
[  291.124858] pm-suspend/4725 is trying to acquire lock:
[  291.124865]  (s_active){++++.+}, at: [<c10f6115>]
sysfs_hash_and_remove+0x3d/0x4f
[  291.124888]
[  291.124890] but task is already holding lock:
[  291.124896]  (s_active){++++.+}, at: [<c10f792d>]
sysfs_get_active_two+0x16/0x34
[  291.124914]
[  291.124917] other info that might help us debug this:
[  291.124925] 6 locks held by pm-suspend/4725:
[  291.124930]  #0:  (&buffer->mutex){+.+.+.}, at: [<c10f68d0>]
sysfs_write_file+0x25/0xeb
[  291.124949]  #1:  (s_active){++++.+}, at: [<c10f792d>]
sysfs_get_active_two+0x16/0x34
[  291.124968]  #2:  (s_active/1){.+.+.+}, at: [<c10f7938>]
sysfs_get_active_two+0x21/0x34
[  291.124990]  #3:  (pm_mutex){+.+.+.}, at: [<c1066f92>] enter_state+0x26/0x114
[  291.125010]  #4:  (cpu_add_remove_lock){+.+.+.}, at: [<c10359dc>]
cpu_maps_update_begin+0xf/0x11
[  291.125030]  #5:  (cpu_hotplug.lock){+.+.+.}, at: [<c1035a0a>]
cpu_hotplug_begin+0x1d/0x40
[  291.125049]
[  291.125051] stack backtrace:
[  291.125060] Pid: 4725, comm: pm-suspend Not tainted 2.6.33-rc4 #3
[  291.125067] Call Trace:
[  291.125081]  [<c12f458f>] ? printk+0xf/0x18
[  291.125094]  [<c105c00d>] __lock_acquire+0x811/0xb67
[  291.125108]  [<c105ae18>] ? mark_held_locks+0x43/0x5b
[  291.125121]  [<c105b1f6>] ? debug_check_no_locks_freed+0x108/0x126
[  291.125134]  [<c105b0b9>] ? trace_hardirqs_on_caller+0x119/0x141
[  291.125147]  [<c10f6115>] ? sysfs_hash_and_remove+0x3d/0x4f
[  291.125160]  [<c105c406>] lock_acquire+0xa3/0xcd
[  291.125172]  [<c10f6115>] ? sysfs_hash_and_remove+0x3d/0x4f
[  291.125186]  [<c10f77c2>] sysfs_addrm_finish+0xa6/0x10a
[  291.125198]  [<c10f6115>] ? sysfs_hash_and_remove+0x3d/0x4f
[  291.125214]  [<c10f6115>] sysfs_hash_and_remove+0x3d/0x4f
[  291.125227]  [<c10f867d>] sysfs_remove_group+0x52/0x81
[  291.125240]  [<c12f2b05>] mc_cpu_callback+0x73/0x9a
[  291.125253]  [<c104fa68>] notifier_call_chain+0x51/0x78
[  291.125266]  [<c104faf4>] __raw_notifier_call_chain+0xe/0x10
[  291.125278]  [<c12e6cad>] _cpu_down+0x7a/0x235
[  291.125291]  [<c1035a85>] disable_nonboot_cpus+0x58/0xe0
[  291.125305]  [<c1066e90>] suspend_devices_and_enter+0xc1/0x19d
[  291.125318]  [<c1067034>] enter_state+0xc8/0x114
[  291.125330]  [<c1066899>] state_store+0x93/0xa7
[  291.125342]  [<c1066806>] ? state_store+0x0/0xa7
[  291.125355]  [<c1165ad5>] kobj_attr_store+0x16/0x22
[  291.125368]  [<c10f696b>] sysfs_write_file+0xc0/0xeb
[  291.125381]  [<c10f68ab>] ? sysfs_write_file+0x0/0xeb
[  291.125394]  [<c10b749e>] vfs_write+0x80/0xdf
[  291.125407]  [<c10b7591>] sys_write+0x3b/0x5d
[  291.125420]  [<c10031e3>] sysenter_do_call+0x12/0x3c
[  291.228068] CPU 1 is now offline
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