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Date: Fri, 09 Oct 2009 19:58:45 -0400
From: Valdis.Kletnieks@...edu
To: Andrew Morton <akpm@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel@...r.kernel.org
Subject: 2.6.32-rc3-mmotm1009 - lockdep warning during very early boot...
Found this in dmesg. It's reproducible, I've hit it on 3 out of 3 boots so far.
Will bisect if nobody fesses up before Monday, but I'm guessing one of these
as they poke at the clocksource code:
commit 66b1a72ceaa7da811db025855f19482f0a38e815
Author: Ingo Molnar <mingo@...e.hu>
Date: Thu Sep 10 19:39:52 2009 +0200
Revert "clocksource: Resolve cpu hotplug dead lock with TSC unstable"
This reverts commit 7285dd7fd375763bfb8ab1ac9cf3f1206f503c16.
causes crashes.
Signed-off-by: Ingo Molnar <mingo@...e.hu>
commit 6fcf67b4c2a4ac4beda87acc7b6e78d9e26b2047
Author: Ingo Molnar <mingo@...e.hu>
Date: Thu Sep 3 19:50:16 2009 +0200
Revert "x86: Make tsc=reliable override boot time stability checks"
This reverts commit d3b8f889a220aed825accc28eb64ce283a0d51ac.
[ 0.330445] hpet0: 3 comparators, 64-bit 14.318180 MHz counter
[ 0.333157] Switching to clocksource hpet
[ 0.333157]
[ 0.333157] =======================================================
[ 0.333157] [ INFO: possible circular locking dependency detected ]
[ 0.333157] 2.6.32-rc3-mmotm1009 #1
[ 0.333157] -------------------------------------------------------
[ 0.333157] swapper/1 is trying to acquire lock:
[ 0.333157] (cpu_add_remove_lock){+.+.+.}, at: [<ffffffff810443a2>] cpu_maps_update_begin+0x12/0x14
[ 0.333157]
[ 0.333157] but task is already holding lock:
[ 0.333157] (setup_lock){+.+.+.}, at: [<ffffffff810803a5>] stop_machine_create+0x12/0x9b
[ 0.333172]
[ 0.333173] which lock already depends on the new lock.
[ 0.333174]
[ 0.333183]
[ 0.333183] the existing dependency chain (in reverse order) is:
[ 0.333192]
[ 0.333192] -> #3 (setup_lock){+.+.+.}:
[ 0.333203] [<ffffffff8106f6f4>] __lock_acquire+0xb35/0xcdd
[ 0.333213] [<ffffffff8106f967>] lock_acquire+0xcb/0xe8
[ 0.333222] [<ffffffff814ba993>] __mutex_lock_common+0x59/0x583
[ 0.333234] [<ffffffff814baf63>] mutex_lock_nested+0x34/0x39
[ 0.333243] [<ffffffff810803a5>] stop_machine_create+0x12/0x9b
[ 0.333253] [<ffffffff81080449>] stop_machine+0x1b/0x4e
[ 0.333263] [<ffffffff810660de>] timekeeping_notify+0x1e/0x25
[ 0.333275] [<ffffffff81067253>] clocksource_select+0xbd/0xc5
[ 0.333285] [<ffffffff818563d1>] clocksource_done_booting+0x28/0x38
[ 0.333298] [<ffffffff8100905f>] do_one_initcall+0x59/0x14e
[ 0.333309] [<ffffffff81843659>] kernel_init+0x14c/0x1a2
[ 0.333320] [<ffffffff8100c35a>] child_rip+0xa/0x20
[ 0.333331]
[ 0.333331] -> #2 (clocksource_mutex){+.+.+.}:
[ 0.333343] [<ffffffff8106f6f4>] __lock_acquire+0xb35/0xcdd
[ 0.333353] [<ffffffff8106f967>] lock_acquire+0xcb/0xe8
[ 0.333363] [<ffffffff814ba993>] __mutex_lock_common+0x59/0x583
[ 0.333373] [<ffffffff814baf63>] mutex_lock_nested+0x34/0x39
[ 0.333383] [<ffffffff8106744c>] clocksource_change_rating+0x1b/0x37
[ 0.333394] [<ffffffff810113fd>] mark_tsc_unstable+0x3f/0x4d
[ 0.333405] [<ffffffff814b5bc6>] check_tsc_sync_source+0xc8/0x10d
[ 0.333417] [<ffffffff814b58e1>] native_cpu_up+0xfb/0x13e
[ 0.333427] [<ffffffff814b6d90>] _cpu_up+0xa8/0x14a
[ 0.333437] [<ffffffff814b6e8d>] cpu_up+0x5b/0x68
[ 0.333447] [<ffffffff818435bf>] kernel_init+0xb2/0x1a2
[ 0.333457] [<ffffffff8100c35a>] child_rip+0xa/0x20
[ 0.333466]
[ 0.333467] -> #1 (cpu_hotplug.lock){+.+.+.}:
[ 0.333478] [<ffffffff8106f6f4>] __lock_acquire+0xb35/0xcdd
[ 0.333489] [<ffffffff8106f967>] lock_acquire+0xcb/0xe8
[ 0.333498] [<ffffffff814ba993>] __mutex_lock_common+0x59/0x583
[ 0.333509] [<ffffffff814baf63>] mutex_lock_nested+0x34/0x39
[ 0.333519] [<ffffffff810443dd>] cpu_hotplug_begin+0x27/0x68
[ 0.333529] [<ffffffff814b6d40>] _cpu_up+0x58/0x14a
[ 0.333538] [<ffffffff814b6e8d>] cpu_up+0x5b/0x68
[ 0.333548] [<ffffffff818435bf>] kernel_init+0xb2/0x1a2
[ 0.333558] [<ffffffff8100c35a>] child_rip+0xa/0x20
[ 0.333567]
[ 0.333568] -> #0 (cpu_add_remove_lock){+.+.+.}:
[ 0.333580] [<ffffffff8106f59e>] __lock_acquire+0x9df/0xcdd
[ 0.333590] [<ffffffff8106f967>] lock_acquire+0xcb/0xe8
[ 0.333600] [<ffffffff814ba993>] __mutex_lock_common+0x59/0x583
[ 0.333610] [<ffffffff814baf63>] mutex_lock_nested+0x34/0x39
[ 0.333620] [<ffffffff810443a2>] cpu_maps_update_begin+0x12/0x14
[ 0.333631] [<ffffffff8105a36a>] __create_workqueue_key+0x146/0x1f4
[ 0.333643] [<ffffffff810803cd>] stop_machine_create+0x3a/0x9b
[ 0.333653] [<ffffffff81080449>] stop_machine+0x1b/0x4e
[ 0.333663] [<ffffffff810660de>] timekeeping_notify+0x1e/0x25
[ 0.333673] [<ffffffff81067253>] clocksource_select+0xbd/0xc5
[ 0.333683] [<ffffffff818563d1>] clocksource_done_booting+0x28/0x38
[ 0.333694] [<ffffffff8100905f>] do_one_initcall+0x59/0x14e
[ 0.333705] [<ffffffff81843659>] kernel_init+0x14c/0x1a2
[ 0.333715] [<ffffffff8100c35a>] child_rip+0xa/0x20
[ 0.333724]
[ 0.333725] other info that might help us debug this:
[ 0.333727]
[ 0.333737] 2 locks held by swapper/1:
[ 0.333743] #0: (clocksource_mutex){+.+.+.}, at: [<ffffffff818563cc>] clocksource_done_booting+0x23/0x38
[ 0.333761] #1: (setup_lock){+.+.+.}, at: [<ffffffff810803a5>] stop_machine_create+0x12/0x9b
[ 0.333778]
[ 0.333779] stack backtrace:
[ 0.333787] Pid: 1, comm: swapper Not tainted 2.6.32-rc3-mmotm1009 #1
[ 0.333795] Call Trace:
[ 0.333802] [<ffffffff8106e79c>] print_circular_bug+0xa8/0xb7
[ 0.333812] [<ffffffff8106f59e>] __lock_acquire+0x9df/0xcdd
[ 0.333822] [<ffffffff814bae20>] ? __mutex_lock_common+0x4e6/0x583
[ 0.333832] [<ffffffff810443a2>] ? cpu_maps_update_begin+0x12/0x14
[ 0.333842] [<ffffffff8106f967>] lock_acquire+0xcb/0xe8
[ 0.333851] [<ffffffff810443a2>] ? cpu_maps_update_begin+0x12/0x14
[ 0.333861] [<ffffffff814ba993>] __mutex_lock_common+0x59/0x583
[ 0.333871] [<ffffffff810443a2>] ? cpu_maps_update_begin+0x12/0x14
[ 0.333881] [<ffffffff814ba74d>] ? mutex_unlock+0x9/0xb
[ 0.333891] [<ffffffff810de209>] ? pcpu_alloc+0x7c6/0x7e0
[ 0.333901] [<ffffffff8106de88>] ? mark_held_locks+0x52/0x70
[ 0.333910] [<ffffffff810443a2>] ? cpu_maps_update_begin+0x12/0x14
[ 0.333920] [<ffffffff8106e0ed>] ? trace_hardirqs_on_caller+0x118/0x13c
[ 0.333930] [<ffffffff814baf63>] mutex_lock_nested+0x34/0x39
[ 0.333940] [<ffffffff810443a2>] cpu_maps_update_begin+0x12/0x14
[ 0.333950] [<ffffffff8105a36a>] __create_workqueue_key+0x146/0x1f4
[ 0.333960] [<ffffffff810659c8>] ? change_clocksource+0x0/0x5b
[ 0.333970] [<ffffffff810803cd>] stop_machine_create+0x3a/0x9b
[ 0.333980] [<ffffffff81080449>] stop_machine+0x1b/0x4e
[ 0.333990] [<ffffffff810660de>] timekeeping_notify+0x1e/0x25
[ 0.333999] [<ffffffff81067253>] clocksource_select+0xbd/0xc5
[ 0.333999] [<ffffffff818563a9>] ? clocksource_done_booting+0x0/0x38
[ 0.333999] [<ffffffff818563d1>] clocksource_done_booting+0x28/0x38
[ 0.333999] [<ffffffff8100905f>] do_one_initcall+0x59/0x14e
[ 0.333999] [<ffffffff81843659>] kernel_init+0x14c/0x1a2
[ 0.333999] [<ffffffff8100c35a>] child_rip+0xa/0x20
[ 0.333999] [<ffffffff8100bcc0>] ? restore_args+0x0/0x30
[ 0.333999] [<ffffffff8184350d>] ? kernel_init+0x0/0x1a2
[ 0.333999] [<ffffffff8100c350>] ? child_rip+0x0/0x20
[ 0.336435] Warning: could not register annotated branches stats
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