Hi,
I started getting the following complaints from lockdep when resuming
plugged into a docking station (2.6.33-rc*):
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.441766] ACPI: Waking up from system sleep state S3
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464717]
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464719] =======================================================
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464720] [ INFO: possible circular locking dependency detected ]
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464723] 2.6.33-rc1 #145
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464724] -------------------------------------------------------
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464726] kacpi_hotplug/23 is trying to acquire lock:
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464728] (kacpid){+.+.+.}, at: [<ffffffff81067130>] flush_workqueue+0x0/0xc0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464736]
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464737] but task is already holding lock:
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464739] ((&dpc->work)){+.+.+.}, at: [<ffffffff81066c7b>] run_workqueue+0xdb/0x2a0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464744]
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464744] which lock already depends on the new lock.
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464745]
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464747]
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464747] the existing dependency chain (in reverse order) is:
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464749]
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464749] -> #1 ((&dpc->work)){+.+.+.}:
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464753] [<ffffffff81080b32>] check_prev_add+0x242/0x570
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464757] [<ffffffff810814b9>] validate_chain+0x659/0x750
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464761] [<ffffffff810818c7>] __lock_acquire+0x317/0x4b0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464764] [<ffffffff81081af9>] lock_acquire+0x99/0x140
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464767] [<ffffffff81066cc6>] run_workqueue+0x126/0x2a0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464770] [<ffffffff81066ed6>] worker_thread+0x96/0xf0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464773] [<ffffffff8106b55e>] kthread+0x8e/0xa0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464777] [<ffffffff81003d94>] kernel_thread_helper+0x4/0x10
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464781]
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464782] -> #0 (kacpid){+.+.+.}:
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464785] [<ffffffff81080e2e>] check_prev_add+0x53e/0x570
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464788] [<ffffffff810814b9>] validate_chain+0x659/0x750
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464791] [<ffffffff810818c7>] __lock_acquire+0x317/0x4b0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464795] [<ffffffff81081af9>] lock_acquire+0x99/0x140
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464798] [<ffffffff8106718c>] flush_workqueue+0x5c/0xc0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464801] [<ffffffff81261ea4>] acpi_os_wait_events_complete+0x10/0x1e
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464805] [<ffffffff81261ecf>] acpi_os_execute_deferred+0x1d/0x31
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464808] [<ffffffff81066ccc>] run_workqueue+0x12c/0x2a0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464811] [<ffffffff81066ed6>] worker_thread+0x96/0xf0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464814] [<ffffffff8106b55e>] kthread+0x8e/0xa0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464818] [<ffffffff81003d94>] kernel_thread_helper+0x4/0x10
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464821]
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464821] other info that might help us debug this:
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464822]
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464824] 2 locks held by kacpi_hotplug/23:
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464826] #0: (kacpi_hotplug){+.+...}, at: [<ffffffff81066c7b>] run_workqueue+0xdb/0x2a0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464831] #1: ((&dpc->work)){+.+.+.}, at: [<ffffffff81066c7b>] run_workqueue+0xdb/0x2a0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464836]
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464836] stack backtrace:
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464839] Pid: 23, comm: kacpi_hotplug Tainted: P 2.6.33-rc1 #145
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464841] Call Trace:
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464845] [<ffffffff8107f199>] print_circular_bug+0xe9/0xf0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464849] [<ffffffff81080e2e>] check_prev_add+0x53e/0x570
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464852] [<ffffffff8107dabf>] ? save_trace+0x3f/0xc0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464856] [<ffffffff81066c7b>] ? run_workqueue+0xdb/0x2a0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464859] [<ffffffff810814b9>] validate_chain+0x659/0x750
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464863] [<ffffffff810818c7>] __lock_acquire+0x317/0x4b0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464866] [<ffffffff81081269>] ? validate_chain+0x409/0x750
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464870] [<ffffffff81081af9>] lock_acquire+0x99/0x140
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464873] [<ffffffff81067130>] ? flush_workqueue+0x0/0xc0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464876] [<ffffffff81261eb2>] ? acpi_os_execute_deferred+0x0/0x31
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464879] [<ffffffff8106718c>] flush_workqueue+0x5c/0xc0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464882] [<ffffffff81067130>] ? flush_workqueue+0x0/0xc0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464885] [<ffffffff81066c7b>] ? run_workqueue+0xdb/0x2a0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464889] [<ffffffff81261ea4>] acpi_os_wait_events_complete+0x10/0x1e
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464892] [<ffffffff81261ecf>] acpi_os_execute_deferred+0x1d/0x31
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464895] [<ffffffff81066ccc>] run_workqueue+0x12c/0x2a0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464898] [<ffffffff81066c7b>] ? run_workqueue+0xdb/0x2a0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464902] [<ffffffff81066ed6>] worker_thread+0x96/0xf0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464905] [<ffffffff8106ba70>] ? autoremove_wake_function+0x0/0x40
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464908] [<ffffffff81066e40>] ? worker_thread+0x0/0xf0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464911] [<ffffffff8106b55e>] kthread+0x8e/0xa0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464915] [<ffffffff81003d94>] kernel_thread_helper+0x4/0x10
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464920] [<ffffffff8143a9c0>] ? restore_args+0x0/0x30
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464923] [<ffffffff8106b4d0>] ? kthread+0x0/0xa0
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464926] [<ffffffff81003d90>] ? kernel_thread_helper+0x0/0x10
Dec 21 08:50:29 dtor-d630 kernel: [ 8018.464932] ACPI: \_SB_.PCI0.PCIE.GDCK - docking
They weren't here with 2.6.32.
Thanks.
--
Dmitry
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