http://bugzilla.kernel.org/show_bug.cgi?id=14553
Summary: INFO: possible circular locking dependency detected
Product: ACPI
Version: 2.5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
AssignedTo: acpi_ot...@kernel-bugs.osdl.org
ReportedBy: dari...@forouher.de
Regression: No
Created an attachment (id=23688)
--> (http://bugzilla.kernel.org/attachment.cgi?id=23688)
kernel config
Got this lockdep warning while putting my Dell Latitude D630 into the docking
station (while it was running):
No idea if this is really ACPI-related, bugzilla just asked me to put a label
on it.
cheers
Dariush
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.32-rc6-00035-g8b17a4f #1
-------------------------------------------------------
kacpi_hotplug/246 is trying to acquire lock:
(kacpid){+.+.+.}, at: [<ffffffff8105bbd0>] flush_workqueue+0x0/0xb0
but task is already holding lock:
(&dpc->work){+.+.+.}, at: [<ffffffff8105abe9>] worker_thread+0x189/0x310
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&dpc->work){+.+.+.}:
[<ffffffff8107382e>] __lock_acquire+0x135e/0x1ce0
[<ffffffff8107420c>] lock_acquire+0x5c/0x80
[<ffffffff8105ac35>] worker_thread+0x1d5/0x310
[<ffffffff8105f3a6>] kthread+0x96/0xa0
[<ffffffff8100c39a>] child_rip+0xa/0x20
-> #0 (kacpid){+.+.+.}:
[<ffffffff8107415d>] __lock_acquire+0x1c8d/0x1ce0
[<ffffffff8107420c>] lock_acquire+0x5c/0x80
[<ffffffff8105bc1e>] flush_workqueue+0x4e/0xb0
[<ffffffff812dfe59>] acpi_os_wait_events_complete+0x10/0x1e
[<ffffffff812dfe84>] acpi_os_execute_deferred+0x1d/0x31
[<ffffffff8105ac3b>] worker_thread+0x1db/0x310
[<ffffffff8105f3a6>] kthread+0x96/0xa0
[<ffffffff8100c39a>] child_rip+0xa/0x20
other info that might help us debug this:
2 locks held by kacpi_hotplug/246:
#0: (kacpi_hotplug){+.+...}, at: [<ffffffff8105abe9>]
worker_thread+0x189/0x310
#1: (&dpc->work){+.+.+.}, at: [<ffffffff8105abe9>] worker_thread+0x189/0x310
stack backtrace:
Pid: 246, comm: kacpi_hotplug Not tainted 2.6.32-rc6-00035-g8b17a4f #1
Call Trace:
[<ffffffff81071e60>] print_circular_bug+0x100/0x110
[<ffffffff8107415d>] __lock_acquire+0x1c8d/0x1ce0
[<ffffffff810701bb>] ? add_lock_to_list+0x5b/0xe0
[<ffffffff810738ca>] ? __lock_acquire+0x13fa/0x1ce0
[<ffffffff810715ed>] ? trace_hardirqs_on_caller+0x14d/0x1a0
[<ffffffff810410df>] ? finish_task_switch+0x6f/0x100
[<ffffffff812dfe67>] ? acpi_os_execute_deferred+0x0/0x31
[<ffffffff8107420c>] lock_acquire+0x5c/0x80
[<ffffffff8105bbd0>] ? flush_workqueue+0x0/0xb0
[<ffffffff8105bc1e>] flush_workqueue+0x4e/0xb0
[<ffffffff8105bbd0>] ? flush_workqueue+0x0/0xb0
[<ffffffff812dfe59>] acpi_os_wait_events_complete+0x10/0x1e
[<ffffffff812dfe84>] acpi_os_execute_deferred+0x1d/0x31
[<ffffffff8105ac3b>] worker_thread+0x1db/0x310
[<ffffffff8105abe9>] ? worker_thread+0x189/0x310
[<ffffffff8104396f>] ? try_to_wake_up+0xaf/0x220
[<ffffffff8105f720>] ? autoremove_wake_function+0x0/0x40
[<ffffffff8107164d>] ? trace_hardirqs_on+0xd/0x10
[<ffffffff8105aa60>] ? worker_thread+0x0/0x310
[<ffffffff8105f3a6>] kthread+0x96/0xa0
[<ffffffff8100c39a>] child_rip+0xa/0x20
[<ffffffff8100bd3c>] ? restore_args+0x0/0x30
[<ffffffff8105f310>] ? kthread+0x0/0xa0
[<ffffffff8100c390>] ? child_rip+0x0/0x20
ACPI: \_SB_.PCI0.PCIE.GDCK - docking
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