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Message-ID: <c4e36d110907310357s1a143522h6fd1b5fc6f43eff9@mail.gmail.com>
Date: Fri, 31 Jul 2009 12:57:27 +0200
From: Zdenek Kabelac <zdenek.kabelac@...il.com>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc: willy@...ux.intel.com
Subject: INFO: possible circular locking dependency detected kacpi_hotplug
Hello
I've noticed this INFO trace in my message log - happened during
undocking T61 C2D 4GB
Zdenek
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.31-rc4-00001-gec938c6 #74
-------------------------------------------------------
/113 is trying to acquire lock:
(kacpid){+.+.+.}, at: [<ffffffff81062ca0>] flush_workqueue+0x0/0xc0
but task is already holding lock:
(&dpc->work){+.+.+.}, at: [<ffffffff81061286>] worker_thread+0x196/0x3a0
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&dpc->work){+.+.+.}:
[<ffffffff8107be6c>] __lock_acquire+0xc5c/0x1090
[<ffffffff8107c338>] lock_acquire+0x98/0x140
[<ffffffff810612d2>] worker_thread+0x1e2/0x3a0
[<ffffffff8106687e>] kthread+0x9e/0xb0
[<ffffffff8100d1da>] child_rip+0xa/0x20
[<ffffffffffffffff>] 0xffffffffffffffff
-> #0 (kacpid){+.+.+.}:
[<ffffffff8107bf3f>] __lock_acquire+0xd2f/0x1090
[<ffffffff8107c338>] lock_acquire+0x98/0x140
[<ffffffff81062d02>] flush_workqueue+0x62/0xc0
[<ffffffff8120bbd0>] acpi_os_wait_events_complete+0x15/0x23
[<ffffffff8120bc0d>] acpi_os_execute_hp_deferred+0x2f/0x43
[<ffffffff810612d8>] worker_thread+0x1e8/0x3a0
[<ffffffff8106687e>] kthread+0x9e/0xb0
[<ffffffff8100d1da>] child_rip+0xa/0x20
[<ffffffffffffffff>] 0xffffffffffffffff
other info that might help us debug this:
2 locks held by kacpi_hotplug/113:
#0: (kacpi_hotplug){+.+...}, at: [<ffffffff81061286>]
worker_thread+0x196/0x3a0
#1: (&dpc->work){+.+.+.}, at: [<ffffffff81061286>] worker_thread+0x196/0x3a0
stack backtrace:
Pid: 113, comm: kacpi_hotplug Not tainted 2.6.31-rc4-00001-gec938c6 #74
Call Trace:
[<ffffffff81079e65>] print_circular_bug_tail+0xa5/0xf0
[<ffffffff8107bf3f>] __lock_acquire+0xd2f/0x1090
[<ffffffff8107857f>] ? save_trace+0x3f/0xb0
[<ffffffff8107c338>] lock_acquire+0x98/0x140
[<ffffffff81062ca0>] ? flush_workqueue+0x0/0xc0
[<ffffffff8120bbde>] ? acpi_os_execute_hp_deferred+0x0/0x43
[<ffffffff81062d02>] flush_workqueue+0x62/0xc0
[<ffffffff81062ca0>] ? flush_workqueue+0x0/0xc0
[<ffffffff81061286>] ? worker_thread+0x196/0x3a0
[<ffffffff8120bbd0>] acpi_os_wait_events_complete+0x15/0x23
[<ffffffff8120bc0d>] acpi_os_execute_hp_deferred+0x2f/0x43
[<ffffffff810612d8>] worker_thread+0x1e8/0x3a0
[<ffffffff81061286>] ? worker_thread+0x196/0x3a0
[<ffffffff81378c5b>] ? thread_return+0x3e/0x703
[<ffffffff81066c60>] ? autoremove_wake_function+0x0/0x40
[<ffffffff810610f0>] ? worker_thread+0x0/0x3a0
[<ffffffff8106687e>] kthread+0x9e/0xb0
[<ffffffff8100d1da>] child_rip+0xa/0x20
[<ffffffff8100cb7c>] ? restore_args+0x0/0x30
[<ffffffff810667e0>] ? kthread+0x0/0xb0
[<ffffffff8100d1d0>] ? child_rip+0x0/0x20
ACPI: \_SB_.GDCK - undocking
usb 1-4: USB disconnect, address 4
usb 1-4.3: USB disconnect, address 5
usb 1-4.4: USB disconnect, address 6
e1000e: eth0 NIC Link is Down
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