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Message-ID: <CAM_iQpUpzJpcS215b14613nGAtgHViGHG9UC2We1Z+jJYDRruw@mail.gmail.com>
Date: Fri, 14 Dec 2012 13:31:05 +0800
From: Cong Wang <xiyou.wangcong@...il.com>
To: Alan Cox <alan@...ux.intel.com>
Cc: Jiri Slaby <jslaby@...e.cz>, LKML <linux-kernel@...r.kernel.org>,
Florian Tobias Schandinat <FlorianSchandinat@....de>
Subject: [console] INFO: possible circular locking dependency detected
[ 601.058431] ======================================================
[ 601.058433] [ INFO: possible circular locking dependency detected ]
[ 601.058439] 3.7.0+ #431 Not tainted
[ 601.058441] -------------------------------------------------------
[ 601.058445] kworker/0:1/17 is trying to acquire lock:
[ 601.058572] ((fb_notifier_list).rwsem){.+.+.+}, at:
[<ffffffff81077e33>] __blocking_notifier_call_chain+0x58/0x8d
[ 601.058575]
[ 601.058575] but task is already holding lock:
[ 601.058633] (console_lock){+.+.+.}, at: [<ffffffff814f75f6>]
console_callback+0x11/0xfe
[ 601.058636]
[ 601.058636] which lock already depends on the new lock.
[ 601.058636]
[ 601.058638]
[ 601.058638] the existing dependency chain (in reverse order) is:
[ 601.058646]
[ 601.058646] -> #1 (console_lock){+.+.+.}:
[ 601.058666] [<ffffffff810a1c5e>] check_prevs_add+0x8b/0x104
[ 601.058674] [<ffffffff810a201e>] validate_chain+0x347/0x383
[ 601.058680] [<ffffffff810a272a>] __lock_acquire+0x3ab/0x424
[ 601.058687] [<ffffffff810a2cfb>] lock_acquire+0xfa/0x145
[ 601.058727] [<ffffffff810508c2>] console_lock+0x71/0x73
[ 601.058736] [<ffffffff814f460a>] register_con_driver+0x3d/0x12a
[ 601.058742] [<ffffffff814f5de3>] take_over_console+0x23/0x4a
[ 601.058809] [<ffffffff8148d713>] fbcon_takeover+0x5c/0x96
[ 601.058817] [<ffffffff81490276>] fbcon_event_notify+0x19a/0x310
[ 601.058847] [<ffffffff8195b274>] notifier_call_chain+0x96/0xcd
[ 601.058856] [<ffffffff81077e4b>]
__blocking_notifier_call_chain+0x70/0x8d
[ 601.058862] [<ffffffff81077e7c>]
blocking_notifier_call_chain+0x14/0x16
[ 601.058871] [<ffffffff8148307f>] fb_notifier_call_chain+0x1b/0x1d
[ 601.058878] [<ffffffff814844dc>] do_register_framebuffer+0x247/0x25e
[ 601.058885] [<ffffffff8148451a>] register_framebuffer+0x27/0x40
[ 601.058893] [<ffffffff81498334>] vga16fb_probe+0x1b6/0x226
[ 601.058913] [<ffffffff8151f5e4>] platform_drv_probe+0x3c/0x68
[ 601.058922] [<ffffffff8151db49>] really_probe+0x99/0x196
[ 601.058930] [<ffffffff8151dd64>] driver_probe_device+0x34/0x4c
[ 601.058938] [<ffffffff8151de38>] __device_attach+0x3a/0x3f
[ 601.058945] [<ffffffff8151c3a6>] bus_for_each_drv+0x59/0x8f
[ 601.058951] [<ffffffff8151dcee>] device_attach+0x79/0x9a
[ 601.058958] [<ffffffff8151d135>] bus_probe_device+0x35/0xae
[ 601.058965] [<ffffffff8151b8cd>] device_add+0x254/0x3d1
[ 601.058972] [<ffffffff8151f338>] platform_device_add+0x14e/0x1b4
[ 601.059045] [<ffffffff823496db>] vga16fb_init+0x88/0xb3
[ 601.059065] [<ffffffff81000256>] do_one_initcall+0x7f/0x13d
[ 601.059092] [<ffffffff8231dbf1>] do_basic_setup+0x96/0xb4
[ 601.059099] [<ffffffff8231dcc5>] kernel_init_freeable+0xb6/0x12b
[ 601.059135] [<ffffffff819218fa>] kernel_init+0xe/0xf2
[ 601.059153] [<ffffffff8195f16c>] ret_from_fork+0x7c/0xb0
[ 601.059161]
[ 601.059161] -> #0 ((fb_notifier_list).rwsem){.+.+.+}:
[ 601.059168] [<ffffffff810a1a34>] check_prev_add+0x68/0x207
[ 601.059175] [<ffffffff810a1c5e>] check_prevs_add+0x8b/0x104
[ 601.059181] [<ffffffff810a201e>] validate_chain+0x347/0x383
[ 601.059187] [<ffffffff810a272a>] __lock_acquire+0x3ab/0x424
[ 601.059194] [<ffffffff810a2cfb>] lock_acquire+0xfa/0x145
[ 601.059212] [<ffffffff81955614>] down_read+0x51/0x84
[ 601.059221] [<ffffffff81077e33>]
__blocking_notifier_call_chain+0x58/0x8d
[ 601.059227] [<ffffffff81077e7c>]
blocking_notifier_call_chain+0x14/0x16
[ 601.059234] [<ffffffff8148307f>] fb_notifier_call_chain+0x1b/0x1d
[ 601.059241] [<ffffffff8148375a>] fb_blank+0x3b/0x8a
[ 601.059248] [<ffffffff8148de15>] fbcon_blank+0xfb/0x1ee
[ 601.059254] [<ffffffff814f50be>] do_blank_screen+0x150/0x1cf
[ 601.059261] [<ffffffff814f76b8>] console_callback+0xd3/0xfe
[ 601.059277] [<ffffffff81069955>] process_one_work+0x249/0x3ff
[ 601.059306] [<ffffffff8106a909>] worker_thread+0x140/0x1d7
[ 601.059314] [<ffffffff81071d29>] kthread+0xb1/0xb9
[ 601.059321] [<ffffffff8195f16c>] ret_from_fork+0x7c/0xb0
[ 601.059323]
[ 601.059323] other info that might help us debug this:
[ 601.059323]
[ 601.059325] Possible unsafe locking scenario:
[ 601.059325]
[ 601.059327] CPU0 CPU1
[ 601.059329] ---- ----
[ 601.059334] lock(console_lock);
[ 601.059339] lock((fb_notifier_list).rwsem);
[ 601.059343] lock(console_lock);
[ 601.059348] lock((fb_notifier_list).rwsem);
[ 601.059350]
[ 601.059350] *** DEADLOCK ***
[ 601.059350]
[ 601.059353] 3 locks held by kworker/0:1/17:
[ 601.059365] #0: (events){.+.+.+}, at: [<ffffffff81069895>]
process_one_work+0x189/0x3ff
[ 601.059376] #1: (console_work){+.+...}, at: [<ffffffff81069895>]
process_one_work+0x189/0x3ff
[ 601.059388] #2: (console_lock){+.+.+.}, at: [<ffffffff814f75f6>]
console_callback+0x11/0xfe
[ 601.059389]
[ 601.059389] stack backtrace:
[ 601.059395] Pid: 17, comm: kworker/0:1 Not tainted 3.7.0+ #431
[ 601.059397] Call Trace:
[ 601.059409] [<ffffffff819366e6>] print_circular_bug+0xc8/0xd9
[ 601.059417] [<ffffffff810a1a34>] check_prev_add+0x68/0x207
[ 601.059438] [<ffffffff810b0019>] ? is_module_text_address+0x23/0x30
[ 601.059447] [<ffffffff810aceff>] ? __module_text_address+0x14/0x5e
[ 601.059456] [<ffffffff81029d4d>] ? pvclock_clocksource_read+0x48/0xb4
[ 601.059463] [<ffffffff810a1c5e>] check_prevs_add+0x8b/0x104
[ 601.059470] [<ffffffff810a201e>] validate_chain+0x347/0x383
[ 601.059477] [<ffffffff810a272a>] __lock_acquire+0x3ab/0x424
[ 601.059486] [<ffffffff81077e33>] ? __blocking_notifier_call_chain+0x58/0x8d
[ 601.059492] [<ffffffff810a2cfb>] lock_acquire+0xfa/0x145
[ 601.059500] [<ffffffff81077e33>] ? __blocking_notifier_call_chain+0x58/0x8d
[ 601.059506] [<ffffffff8109f925>] ? lock_is_held+0x56/0x62
[ 601.059515] [<ffffffff81955614>] down_read+0x51/0x84
[ 601.059522] [<ffffffff81077e33>] ? __blocking_notifier_call_chain+0x58/0x8d
[ 601.059530] [<ffffffff81077c8f>] ? rcu_read_lock_held+0x34/0x3c
[ 601.059537] [<ffffffff81077e33>] __blocking_notifier_call_chain+0x58/0x8d
[ 601.059544] [<ffffffff81077e7c>] blocking_notifier_call_chain+0x14/0x16
[ 601.059551] [<ffffffff8148307f>] fb_notifier_call_chain+0x1b/0x1d
[ 601.059558] [<ffffffff8148375a>] fb_blank+0x3b/0x8a
[ 601.059565] [<ffffffff8148de15>] fbcon_blank+0xfb/0x1ee
[ 601.059573] [<ffffffff81957547>] ? _raw_spin_unlock_irqrestore+0x45/0x61
[ 601.059580] [<ffffffff810a3211>] ? trace_hardirqs_on_caller+0x12d/0x164
[ 601.059588] [<ffffffff8195754f>] ? _raw_spin_unlock_irqrestore+0x4d/0x61
[ 601.059598] [<ffffffff8105dd22>] ? try_to_del_timer_sync+0x5f/0x6b
[ 601.059605] [<ffffffff8105dde9>] ? del_timer_sync+0xbb/0xce
[ 601.059612] [<ffffffff8105dd33>] ? del_timer_sync+0x5/0xce
[ 601.059619] [<ffffffff814f50be>] do_blank_screen+0x150/0x1cf
[ 601.059625] [<ffffffff814f76b8>] console_callback+0xd3/0xfe
[ 601.059631] [<ffffffff81069955>] process_one_work+0x249/0x3ff
[ 601.059637] [<ffffffff81069895>] ? process_one_work+0x189/0x3ff
[ 601.059644] [<ffffffff814f75e5>] ? poke_blanked_console+0xc8/0xc8
[ 601.059651] [<ffffffff8106a909>] worker_thread+0x140/0x1d7
[ 601.059658] [<ffffffff8106a7c9>] ? manage_workers+0xee/0xee
[ 601.059663] [<ffffffff81071d29>] kthread+0xb1/0xb9
[ 601.059671] [<ffffffff81071c78>] ? __init_kthread_worker+0x59/0x59
[ 601.059678] [<ffffffff8195f16c>] ret_from_fork+0x7c/0xb0
[ 601.059684] [<ffffffff81071c78>] ? __init_kthread_worker+0x59/0x59
--
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