Can someone please fix this ?
From: Li Zefan
Date: Fri May 17 2013 - 03:31:41 EST
I've been seeing this since 3.8-rcX. It's very annoying...
[ 634.543378] ======================================================
[ 634.543378] [ INFO: possible circular locking dependency detected ]
[ 634.543380] 3.10.0-rc1-0.7-default+ #8 Not tainted
[ 634.543381] -------------------------------------------------------
[ 634.543382] kworker/3:1/66 is trying to acquire lock:
[ 634.543392] (&fb_info->lock){+.+.+.}, at: [<ffffffff81293107>] lock_fb_info+0x27/0x60
[ 634.543393]
[ 634.543393] but task is already holding lock:
[ 634.543401] (console_lock){+.+.+.}, at: [<ffffffff8131bc13>] console_callback+0x13/0x130
[ 634.543401]
[ 634.543401] which lock already depends on the new lock.
[ 634.543401]
[ 634.543402]
[ 634.543402] the existing dependency chain (in reverse order) is:
[ 634.543404]
[ 634.543404] -> #1 (console_lock){+.+.+.}:
[ 634.543409] [<ffffffff810aa50c>] lock_acquire+0xdc/0x110
[ 634.543413] [<ffffffff8104101f>] console_lock+0x5f/0x70
[ 634.543416] [<ffffffff81294092>] register_framebuffer+0x262/0x350
[ 634.543422] [<ffffffff81ad477c>] vesafb_probe+0x654/0x928
[ 634.543427] [<ffffffff8133c69d>] platform_drv_probe+0x3d/0x70
[ 634.543430] [<ffffffff8133a601>] driver_probe_device+0xc1/0x3e0
[ 634.543433] [<ffffffff8133a9bb>] __driver_attach+0x9b/0xa0
[ 634.543435] [<ffffffff81338718>] bus_for_each_dev+0x98/0xc0
[ 634.543437] [<ffffffff8133a351>] driver_attach+0x21/0x30
[ 634.543440] [<ffffffff81339c81>] bus_add_driver+0x111/0x270
[ 634.543442] [<ffffffff8133b088>] driver_register+0x68/0x150
[ 634.543444] [<ffffffff8133c516>] platform_driver_register+0x46/0x50
[ 634.543447] [<ffffffff8133c53b>] platform_driver_probe+0x1b/0xb0
[ 634.543449] [<ffffffff81ad3fcf>] vesafb_init+0xff/0x258
[ 634.543455] [<ffffffff8100032a>] do_one_initcall+0x15a/0x1c0
[ 634.543459] [<ffffffff81aa28e1>] kernel_init_freeable+0x15d/0x1f3
[ 634.543464] [<ffffffff81484e8e>] kernel_init+0xe/0x180
[ 634.543470] [<ffffffff814a665c>] ret_from_fork+0x7c/0xb0
[ 634.543472]
[ 634.543472] -> #0 (&fb_info->lock){+.+.+.}:
[ 634.543474] [<ffffffff810aa06d>] __lock_acquire+0x14dd/0x18a0
[ 634.543476] [<ffffffff810aa50c>] lock_acquire+0xdc/0x110
[ 634.543479] [<ffffffff81498d90>] mutex_lock_nested+0x40/0x390
[ 634.543481] [<ffffffff81293107>] lock_fb_info+0x27/0x60
[ 634.543484] [<ffffffff812a00d9>] fbcon_blank+0x289/0x2d0
[ 634.543486] [<ffffffff8131bb63>] do_blank_screen+0x1c3/0x260
[ 634.543488] [<ffffffff8131bc9c>] console_callback+0x9c/0x130
[ 634.543494] [<ffffffff81061fb5>] process_one_work+0x205/0x570
[ 634.543496] [<ffffffff81064bb3>] worker_thread+0x133/0x420
[ 634.543499] [<ffffffff8106b31e>] kthread+0xde/0xf0
[ 634.543502] [<ffffffff814a665c>] ret_from_fork+0x7c/0xb0
[ 634.543502]
[ 634.543502] other info that might help us debug this:
[ 634.543502]
[ 634.543503] Possible unsafe locking scenario:
[ 634.543503]
[ 634.543503] CPU0 CPU1
[ 634.543504] ---- ----
[ 634.543505] lock(console_lock);
[ 634.543507] lock(&fb_info->lock);
[ 634.543508] lock(console_lock);
[ 634.543509] lock(&fb_info->lock);
[ 634.543510]
[ 634.543510] *** DEADLOCK ***
[ 634.543510]
[ 634.543511] 3 locks held by kworker/3:1/66:
[ 634.543516] #0: (events){.+.+.+}, at: [<ffffffff81061f1e>] process_one_work+0x16e/0x570
[ 634.543520] #1: (console_work){+.+...}, at: [<ffffffff81061f1e>] process_one_work+0x16e/0x570
[ 634.543523] #2: (console_lock){+.+.+.}, at: [<ffffffff8131bc13>] console_callback+0x13/0x130
[ 634.543524]
[ 634.543524] stack backtrace:
[ 634.543526] CPU: 3 PID: 66 Comm: kworker/3:1 Not tainted 3.10.0-rc1-0.7-default+ #8
[ 634.543527] Hardware name: Huawei Technologies Co., Ltd. Tecal RH2285 /BC11BTSA , BIOS CTSAV036 04/27/2011
[ 634.543530] Workqueue: events console_callback
[ 634.543534] ffffffff81e498a0 ffff880bf910f9f8 ffffffff814984cc ffff880bf910fa38
[ 634.543536] ffffffff810a71f3 0000000000000003 0000000000000050 0000000000000003
[ 634.543539] 0000000000000000 ffff880bf91426d0 0000878a84046138 ffff880bf910fb18
[ 634.543540] Call Trace:
[ 634.543543] [<ffffffff814984cc>] dump_stack+0x19/0x1d
[ 634.543545] [<ffffffff810a71f3>] print_circular_bug+0x223/0x330
[ 634.543547] [<ffffffff810aa06d>] __lock_acquire+0x14dd/0x18a0
[ 634.543552] [<ffffffff812a9802>] ? bitfill_aligned+0xe2/0x140
[ 634.543554] [<ffffffff810aa50c>] lock_acquire+0xdc/0x110
[ 634.543556] [<ffffffff81293107>] ? lock_fb_info+0x27/0x60
[ 634.543559] [<ffffffff81498d90>] mutex_lock_nested+0x40/0x390
[ 634.543561] [<ffffffff81293107>] ? lock_fb_info+0x27/0x60
[ 634.543563] [<ffffffff812a3d39>] ? bit_clear+0xd9/0xf0
[ 634.543567] [<ffffffff810718b6>] ? blocking_notifier_call_chain+0x16/0x20
[ 634.543570] [<ffffffff8129d22c>] ? fbcon_clear+0x12c/0x1e0
[ 634.543572] [<ffffffff81293107>] lock_fb_info+0x27/0x60
[ 634.543575] [<ffffffff812a00d9>] fbcon_blank+0x289/0x2d0
[ 634.543578] [<ffffffff8149d414>] ? _raw_spin_unlock_irqrestore+0x44/0x70
[ 634.543580] [<ffffffff810a882d>] ? trace_hardirqs_on_caller+0x14d/0x1f0
[ 634.543582] [<ffffffff810a88dd>] ? trace_hardirqs_on+0xd/0x10
[ 634.543587] [<ffffffff8105069b>] ? try_to_del_timer_sync+0x5b/0x70
[ 634.543589] [<ffffffff810a882d>] ? trace_hardirqs_on_caller+0x14d/0x1f0
[ 634.543592] [<ffffffff8131bb63>] do_blank_screen+0x1c3/0x260
[ 634.543594] [<ffffffff8131bc9c>] console_callback+0x9c/0x130
[ 634.543597] [<ffffffff81061fb5>] process_one_work+0x205/0x570
[ 634.543599] [<ffffffff81061f1e>] ? process_one_work+0x16e/0x570
[ 634.543601] [<ffffffff81064bb3>] worker_thread+0x133/0x420
[ 634.543603] [<ffffffff810a88dd>] ? trace_hardirqs_on+0xd/0x10
[ 634.543605] [<ffffffff81064a80>] ? manage_workers+0x320/0x320
[ 634.543607] [<ffffffff8106b31e>] kthread+0xde/0xf0
[ 634.543610] [<ffffffff8106b240>] ? __init_kthread_worker+0x70/0x70
[ 634.543613] [<ffffffff814a665c>] ret_from_fork+0x7c/0xb0
[ 634.543615] [<ffffffff8106b240>] ? __init_kthread_worker+0x70/0x70
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