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Subject2.6.32-rc5-mmotm1101 - lockdep whinge during early boot
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Am seeing this at boot:

[ 0.344028] Switching to clocksource hpet
[ 0.344114]
[ 0.344115] =======================================================
[ 0.344125] [ INFO: possible circular locking dependency detected ]
[ 0.344133] 2.6.32-rc5-mmotm1101 #2
[ 0.344139] -------------------------------------------------------
[ 0.344147] swapper/1 is trying to acquire lock:
[ 0.344154] (cpu_add_remove_lock){+.+.+.}, at: [<ffffffff8103c222>] cpu_maps_update_begin+0x12/0x14
[ 0.344174]
[ 0.344175] but task is already holding lock:
[ 0.344183] (setup_lock){+.+.+.}, at: [<ffffffff81078755>] stop_machine_create+0x12/0x9b
[ 0.344200]
[ 0.344201] which lock already depends on the new lock.
[ 0.344202]
[ 0.344212]
[ 0.344213] the existing dependency chain (in reverse order) is:
[ 0.344222]
[ 0.344223] -> #3 (setup_lock){+.+.+.}:
[ 0.344235] [<ffffffff81067898>] __lock_acquire+0xb31/0xcd9
[ 0.344246] [<ffffffff81067b0b>] lock_acquire+0xcb/0xe8
[ 0.344255] [<ffffffff814bbf41>] __mutex_lock_common+0x5c/0x5aa
[ 0.344268] [<ffffffff814bc535>] mutex_lock_nested+0x34/0x39
[ 0.344278] [<ffffffff81078755>] stop_machine_create+0x12/0x9b
[ 0.344289] [<ffffffff810787f9>] stop_machine+0x1b/0x4e
[ 0.344298] [<ffffffff8105e312>] timekeeping_notify+0x1e/0x25
[ 0.344310] [<ffffffff8105f40f>] clocksource_select+0xbd/0xc5
[ 0.344320] [<ffffffff81b1f403>] clocksource_done_booting+0x28/0x38
[ 0.344333] [<ffffffff810001f7>] do_one_initcall+0x59/0x14e
[ 0.344344] [<ffffffff81b0c66c>] kernel_init+0x15f/0x1b5
[ 0.344355] [<ffffffff8100337a>] child_rip+0xa/0x20
[ 0.344366]
[ 0.344366] -> #2 (clocksource_mutex){+.+.+.}:
[ 0.344378] [<ffffffff81067898>] __lock_acquire+0xb31/0xcd9
[ 0.344388] [<ffffffff81067b0b>] lock_acquire+0xcb/0xe8
[ 0.344398] [<ffffffff814bbf41>] __mutex_lock_common+0x5c/0x5aa
[ 0.344408] [<ffffffff814bc535>] mutex_lock_nested+0x34/0x39
[ 0.344419] [<ffffffff8105f608>] clocksource_change_rating+0x1b/0x37
[ 0.344430] [<ffffffff81008449>] mark_tsc_unstable+0x3f/0x4d
[ 0.344440] [<ffffffff814b7135>] check_tsc_sync_source+0xc8/0x10d
[ 0.344451] [<ffffffff814b6e50>] native_cpu_up+0xfb/0x13e
[ 0.344461] [<ffffffff814b82ff>] _cpu_up+0xa8/0x14a
[ 0.344471] [<ffffffff814b83fc>] cpu_up+0x5b/0x68
[ 0.344480] [<ffffffff81b0c5d2>] kernel_init+0xc5/0x1b5
[ 0.344490] [<ffffffff8100337a>] child_rip+0xa/0x20
[ 0.344499]
[ 0.344500] -> #1 (cpu_hotplug.lock){+.+.+.}:
[ 0.344512] [<ffffffff81067898>] __lock_acquire+0xb31/0xcd9
[ 0.344522] [<ffffffff81067b0b>] lock_acquire+0xcb/0xe8
[ 0.344531] [<ffffffff814bbf41>] __mutex_lock_common+0x5c/0x5aa
[ 0.344542] [<ffffffff814bc535>] mutex_lock_nested+0x34/0x39
[ 0.344552] [<ffffffff8103c25d>] cpu_hotplug_begin+0x27/0x68
[ 0.344562] [<ffffffff814b82af>] _cpu_up+0x58/0x14a
[ 0.344572] [<ffffffff814b83fc>] cpu_up+0x5b/0x68
[ 0.344581] [<ffffffff81b0c5d2>] kernel_init+0xc5/0x1b5
[ 0.344591] [<ffffffff8100337a>] child_rip+0xa/0x20
[ 0.344600]
[ 0.344601] -> #0 (cpu_add_remove_lock){+.+.+.}:
[ 0.344613] [<ffffffff81067742>] __lock_acquire+0x9db/0xcd9
[ 0.344623] [<ffffffff81067b0b>] lock_acquire+0xcb/0xe8
[ 0.344632] [<ffffffff814bbf41>] __mutex_lock_common+0x5c/0x5aa
[ 0.344643] [<ffffffff814bc535>] mutex_lock_nested+0x34/0x39
[ 0.344653] [<ffffffff8103c222>] cpu_maps_update_begin+0x12/0x14
[ 0.344664] [<ffffffff81052461>] __create_workqueue_key+0x146/0x1f4
[ 0.344675] [<ffffffff8107877d>] stop_machine_create+0x3a/0x9b
[ 0.344686] [<ffffffff810787f9>] stop_machine+0x1b/0x4e
[ 0.344696] [<ffffffff8105e312>] timekeeping_notify+0x1e/0x25
[ 0.344706] [<ffffffff8105f40f>] clocksource_select+0xbd/0xc5
[ 0.344716] [<ffffffff81b1f403>] clocksource_done_booting+0x28/0x38
[ 0.344727] [<ffffffff810001f7>] do_one_initcall+0x59/0x14e
[ 0.344737] [<ffffffff81b0c66c>] kernel_init+0x15f/0x1b5
[ 0.344747] [<ffffffff8100337a>] child_rip+0xa/0x20
[ 0.344756]
[ 0.344757] other info that might help us debug this:
[ 0.344758]
[ 0.344769] 2 locks held by swapper/1:
[ 0.344774] #0: (clocksource_mutex){+.+.+.}, at: [<ffffffff81b1f3fe>] clocksource_done_booting+0x23/0x38
[ 0.344792] #1: (setup_lock){+.+.+.}, at: [<ffffffff81078755>] stop_machine_create+0x12/0x9b
[ 0.344809]
[ 0.344810] stack backtrace:
[ 0.344820] Pid: 1, comm: swapper Not tainted 2.6.32-rc5-mmotm1101 #2
[ 0.344829] Call Trace:
[ 0.344837] [<ffffffff81066944>] print_circular_bug+0xa8/0xb7
[ 0.344847] [<ffffffff81067742>] __lock_acquire+0x9db/0xcd9
[ 0.344857] [<ffffffff8103c222>] ? cpu_maps_update_begin+0x12/0x14
[ 0.344867] [<ffffffff81067b0b>] lock_acquire+0xcb/0xe8
[ 0.344876] [<ffffffff8103c222>] ? cpu_maps_update_begin+0x12/0x14
[ 0.344887] [<ffffffff814bbf41>] __mutex_lock_common+0x5c/0x5aa
[ 0.344896] [<ffffffff8103c222>] ? cpu_maps_update_begin+0x12/0x14
[ 0.344906] [<ffffffff814bbcea>] ? mutex_unlock+0x9/0xb
[ 0.344916] [<ffffffff810d743d>] ? pcpu_alloc+0x80c/0x826
[ 0.344926] [<ffffffff8103c222>] ? cpu_maps_update_begin+0x12/0x14
[ 0.344936] [<ffffffff810d4fda>] ? kmem_cache_alloc+0xbb/0x183
[ 0.344946] [<ffffffff81066295>] ? trace_hardirqs_on_caller+0x118/0x13c
[ 0.344956] [<ffffffff814bc535>] mutex_lock_nested+0x34/0x39
[ 0.344966] [<ffffffff8103c222>] cpu_maps_update_begin+0x12/0x14
[ 0.344976] [<ffffffff81052461>] __create_workqueue_key+0x146/0x1f4
[ 0.344986] [<ffffffff8105dbc4>] ? change_clocksource+0x0/0x5b
[ 0.344996] [<ffffffff8107877d>] stop_machine_create+0x3a/0x9b
[ 0.344999] [<ffffffff810787f9>] stop_machine+0x1b/0x4e
[ 0.344999] [<ffffffff8105e312>] timekeeping_notify+0x1e/0x25
[ 0.344999] [<ffffffff8105f40f>] clocksource_select+0xbd/0xc5
[ 0.344999] [<ffffffff81b1f3db>] ? clocksource_done_booting+0x0/0x38
[ 0.344999] [<ffffffff81b1f403>] clocksource_done_booting+0x28/0x38
[ 0.344999] [<ffffffff810001f7>] do_one_initcall+0x59/0x14e
[ 0.344999] [<ffffffff81b0c66c>] kernel_init+0x15f/0x1b5
[ 0.344999] [<ffffffff8100337a>] child_rip+0xa/0x20
[ 0.344999] [<ffffffff814be2c0>] ? restore_args+0x0/0x30
[ 0.344999] [<ffffffff81b0c50d>] ? kernel_init+0x0/0x1b5
[ 0.344999] [<ffffffff81003370>] ? child_rip+0x0/0x20
[ 0.345393] Warning: could not register annotated branches stats
[ 0.349818] pnp: PnP ACPI init
[ 0.349843] ACPI: bus type pnp registered
[unhandled content-type:application/pgp-signature]
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