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Date: Fri, 27 Mar 2009 00:07:33 -0500
From: Larry Finger <Larry.Finger@...inger.net>
To: LKML <linux-kernel@...r.kernel.org>
Subject: Possible IRQ lock inversion from 2.6.29-Linus-03321-gbe0ea69 (2.6.29-git)
On my x86_64 dual core system, I get the following messages logged.
=========================================================
[ INFO: possible irq lock inversion dependency detected ]
2.6.29-Linus-03321-gbe0ea69 #55
---------------------------------------------------------
swapper/0 just changed the state of lock:
(fasync_lock){..+.}, at: [<ffffffff802c7073>] kill_fasync+0x2c/0x4e
but this lock took another, hard-irq-unsafe lock in the past:
(&f->f_lock){--..}
and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
4 locks held by swapper/0:
#0: (&serio->lock){+...}, at: [<ffffffff803c47a4>] serio_interrupt+0x2b/0x83
#1: (&dev->event_lock){+...}, at: [<ffffffff803c8bd3>] input_event+0x40/0x7d
#2: (rcu_read_lock){..--}, at: [<ffffffff803c7541>] input_pass_event+0x0/0xcc
#3: (rcu_read_lock){..--}, at: [<ffffffff803cbad3>] evdev_event+0x0/0xfd
the first lock's dependencies:
-> (fasync_lock){..+.} ops: 0 {
initial-use at:
[<ffffffff80262870>] __lock_acquire+0x79e/0x1697
[<ffffffff802637be>] lock_acquire+0x55/0x71
[<ffffffff804642bf>] _write_lock_irq+0x37/0x43
[<ffffffff802c6bf5>] fasync_helper+0x57/0x110
[<ffffffff802ea28c>] locks_delete_lock+0x50/0x9f
[<ffffffff802ea819>] __posix_lock_file+0x326/0x549
[<ffffffff802eaa8c>] vfs_lock_file+0x38/0x3a
[<ffffffff802eab1f>] locks_remove_posix+0x91/0xb2
[<ffffffff802b9634>] filp_close+0x56/0x68
[<ffffffff802b96f0>] sys_close+0xaa/0xe9
[<ffffffff8020c2cb>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
in-hardirq-R at:
[<ffffffffffffffff>] 0xffffffffffffffff
}
... key at: [<ffffffff805f7db8>] fasync_lock+0x18/0x30
-> (&f->f_lock){--..} ops: 0 {
initial-use at:
[<ffffffff80262870>] __lock_acquire+0x79e/0x1697
[<ffffffff802637be>] lock_acquire+0x55/0x71
[<ffffffff80464126>] _spin_lock+0x31/0x3d
[<ffffffff802c6c74>] fasync_helper+0xd6/0x110
[<ffffffff802ea28c>] locks_delete_lock+0x50/0x9f
[<ffffffff802ea819>] __posix_lock_file+0x326/0x549
[<ffffffff802eaa8c>] vfs_lock_file+0x38/0x3a
[<ffffffff802eab1f>] locks_remove_posix+0x91/0xb2
[<ffffffff802b9634>] filp_close+0x56/0x68
[<ffffffff802b96f0>] sys_close+0xaa/0xe9
[<ffffffff8020c2cb>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
softirq-on-W at:
[<ffffffff80262857>] __lock_acquire+0x785/0x1697
[<ffffffff802637be>] lock_acquire+0x55/0x71
[<ffffffff80464126>] _spin_lock+0x31/0x3d
[<ffffffff802c7505>] sys_fcntl+0x2aa/0x36c
[<ffffffff8020c2cb>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
hardirq-on-W at:
[<ffffffff8026282e>] __lock_acquire+0x75c/0x1697
[<ffffffff802637be>] lock_acquire+0x55/0x71
[<ffffffff80464126>] _spin_lock+0x31/0x3d
[<ffffffff802c7505>] sys_fcntl+0x2aa/0x36c
[<ffffffff8020c2cb>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
}
... key at: [<ffffffff81096e08>] __key.20386+0x0/0x8
... acquired at:
[<ffffffff80263404>] __lock_acquire+0x1332/0x1697
[<ffffffff802637be>] lock_acquire+0x55/0x71
[<ffffffff80464126>] _spin_lock+0x31/0x3d
[<ffffffff802c6c74>] fasync_helper+0xd6/0x110
[<ffffffff802ea28c>] locks_delete_lock+0x50/0x9f
[<ffffffff802ea819>] __posix_lock_file+0x326/0x549
[<ffffffff802eaa8c>] vfs_lock_file+0x38/0x3a
[<ffffffff802eab1f>] locks_remove_posix+0x91/0xb2
[<ffffffff802b9634>] filp_close+0x56/0x68
[<ffffffff802b96f0>] sys_close+0xaa/0xe9
[<ffffffff8020c2cb>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
the second lock's dependencies:
-> (&f->f_lock){--..} ops: 0 {
initial-use at:
[<ffffffff80262870>] __lock_acquire+0x79e/0x1697
[<ffffffff802637be>] lock_acquire+0x55/0x71
[<ffffffff80464126>] _spin_lock+0x31/0x3d
[<ffffffff802c6c74>] fasync_helper+0xd6/0x110
[<ffffffff802ea28c>] locks_delete_lock+0x50/0x9f
[<ffffffff802ea819>] __posix_lock_file+0x326/0x549
[<ffffffff802eaa8c>] vfs_lock_file+0x38/0x3a
[<ffffffff802eab1f>] locks_remove_posix+0x91/0xb2
[<ffffffff802b9634>] filp_close+0x56/0x68
[<ffffffff802b96f0>] sys_close+0xaa/0xe9
[<ffffffff8020c2cb>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
softirq-on-W at:
[<ffffffff80262857>] __lock_acquire+0x785/0x1697
[<ffffffff802637be>] lock_acquire+0x55/0x71
[<ffffffff80464126>] _spin_lock+0x31/0x3d
[<ffffffff802c7505>] sys_fcntl+0x2aa/0x36c
[<ffffffff8020c2cb>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
hardirq-on-W at:
[<ffffffff8026282e>] __lock_acquire+0x75c/0x1697
[<ffffffff802637be>] lock_acquire+0x55/0x71
[<ffffffff80464126>] _spin_lock+0x31/0x3d
[<ffffffff802c7505>] sys_fcntl+0x2aa/0x36c
[<ffffffff8020c2cb>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
}
... key at: [<ffffffff81096e08>] __key.20386+0x0/0x8
stack backtrace:
Pid: 0, comm: swapper Not tainted 2.6.29-Linus-03321-gbe0ea69 #55
Call Trace:
<IRQ> [<ffffffff80260a11>] print_irq_inversion_bug+0x175/0x184
[<ffffffff80260ab8>] check_usage_forwards+0x98/0xa1
[<ffffffff8026113b>] mark_lock+0x5dd/0xa2b
[<ffffffff80262748>] __lock_acquire+0x676/0x1697
[<ffffffff80262870>] ? __lock_acquire+0x79e/0x1697
[<ffffffff802637be>] lock_acquire+0x55/0x71
[<ffffffff802c7073>] ? kill_fasync+0x2c/0x4e
[<ffffffff8046442b>] _read_lock+0x34/0x41
[<ffffffff802c7073>] ? kill_fasync+0x2c/0x4e
[<ffffffff802c7073>] kill_fasync+0x2c/0x4e
[<ffffffff803cb7bd>] evdev_pass_event+0x6e/0x77
[<ffffffff803cbb47>] evdev_event+0x74/0xfd
[<ffffffff803cbad3>] ? evdev_event+0x0/0xfd
[<ffffffff803c75a5>] input_pass_event+0x64/0xcc
[<ffffffff803c7541>] ? input_pass_event+0x0/0xcc
[<ffffffff803c7cdf>] input_handle_event+0x339/0x345
[<ffffffff803c8bf6>] input_event+0x63/0x7d
[<ffffffff803d1275>] alps_process_packet+0x3b7/0x4cc
[<ffffffff803d13e5>] alps_process_byte+0x5b/0x6e
[<ffffffff803ce797>] psmouse_handle_byte+0x17/0x10d
[<ffffffff803cf766>] psmouse_interrupt+0x277/0x285
[<ffffffff803c47a4>] ? serio_interrupt+0x2b/0x83
[<ffffffff803c47c0>] serio_interrupt+0x47/0x83
[<ffffffff803c58b7>] i8042_interrupt+0x200/0x215
[<ffffffff8027b277>] handle_IRQ_event+0x6b/0xa1
[<ffffffff8027c55c>] handle_edge_irq+0xeb/0x131
[<ffffffff80464a25>] __irqentry_text_start+0x6d/0xd8
[<ffffffff8020cd13>] ret_from_intr+0x0/0xf
<EOI> [<ffffffff8025d068>] ? tick_broadcast_oneshot_control+0x1f/0x102
[<ffffffff802130e6>] ? default_idle+0x35/0x4f
[<ffffffff802130e4>] ? default_idle+0x33/0x4f
[<ffffffff802131ed>] ? c1e_idle+0xda/0x101
[<ffffffff8025713e>] ? atomic_notifier_call_chain+0xf/0x11
[<ffffffff8020b1f6>] ? cpu_idle+0x5c/0x9d
[<ffffffff80451797>] ? rest_init+0x6b/0x6d
--
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