From: "Paul E. McKenney" <paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Cc: menage-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
balbir-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org
Subject: Lockdep splat in cpuset code acquiring alloc_lock
Date: Wed, 14 Apr 2010 13:23:47 -0700 [thread overview]
Message-ID: <20100414202347.GA26791__1392.15136082402$1271276845$gmane$org@linux.vnet.ibm.com> (raw)
Hello!
I hit the following lockdep splat on one of many runs. Thoughts?
Thanx, Paul
------------------------------------------------------------------------
=================================
[ INFO: inconsistent lock state ]
2.6.34-rc3-autokern1 #1
---------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
swapper/0 [HC0[0]:SC1[1]:HE0:SE0] takes:
(&(&p->alloc_lock)->rlock){+.?...}, at: [<c0000000000affd4>] .cpuset_cpus_allowed_locked+0x2c/0xbc
{SOFTIRQ-ON-W} state was registered at:
[<c000000000097ca8>] .lock_acquire+0x5c/0x88
[<c000000000570270>] ._raw_spin_lock+0x48/0x70
[<c000000000126cec>] .set_task_comm+0x34/0x9c
[<c0000000000802f0>] .kthreadd+0x30/0x160
[<c000000000026c90>] .kernel_thread+0x54/0x70
irq event stamp: 782497
hardirqs last enabled at (782496): [<c000000000570ebc>] ._raw_spin_unlock_irq+0x38/0x80
hardirqs last disabled at (782497): [<c000000000050fb4>] .task_rq_lock+0x74/0x130
softirqs last enabled at (782478): [<c000000000026acc>] .call_do_softirq+0x14/0x24
softirqs last disabled at (782493): [<c000000000026acc>] .call_do_softirq+0x14/0x24
other info that might help us debug this:
2 locks held by swapper/0:
#0: (&timer){+.-.-.}, at: [<c0000000000712a0>] .run_timer_softirq+0x138/0x298
#1: (rcu_read_lock){.+.+..}, at: [<c000000000054180>] .select_fallback_rq+0xe8/0x1c4
stack backtrace:
Call Trace:
[c00000000ffff740] [c000000000010168] .show_stack+0x70/0x184 (unreliable)
[c00000000ffff7f0] [c0000000000933b8] .print_usage_bug+0x1d4/0x208
[c00000000ffff8b0] [c000000000093778] .mark_lock+0x38c/0x6f4
[c00000000ffff960] [c00000000009696c] .__lock_acquire+0x6ac/0x96c
[c00000000ffffa60] [c000000000097ca8] .lock_acquire+0x5c/0x88
[c00000000ffffb00] [c000000000570270] ._raw_spin_lock+0x48/0x70
[c00000000ffffb90] [c0000000000affd4] .cpuset_cpus_allowed_locked+0x2c/0xbc
[c00000000ffffc20] [c0000000000541bc] .select_fallback_rq+0x124/0x1c4
[c00000000ffffcd0] [c00000000005ee44] .try_to_wake_up+0x1ac/0x3b4
[c00000000ffffd80] [c000000000071910] .process_timeout+0x10/0x24
[c00000000ffffdf0] [c000000000071348] .run_timer_softirq+0x1e0/0x298
[c00000000ffffed0] [c00000000006a440] .__do_softirq+0x158/0x254
[c00000000fffff90] [c000000000026acc] .call_do_softirq+0x14/0x24
[c00000000095b8f0] [c00000000000cd34] .do_softirq+0xb0/0x138
[c00000000095b990] [c00000000006a680] .irq_exit+0x88/0x100
[c00000000095ba20] [c0000000000243a8] .timer_interrupt+0x150/0x19c
[c00000000095bad0] [c000000000003704] decrementer_common+0x104/0x180
--- Exception: 901 at .raw_local_irq_restore+0x6c/0x80
LR = .cpu_idle+0x138/0x20c
[c00000000095bdc0] [0000000000253400] 0x253400 (unreliable)
[c00000000095be40] [c0000000000129e8] .cpu_idle+0x138/0x20c
[c00000000095bed0] [c00000000057a844] .start_secondary+0x3c4/0x404
[c00000000095bf90] [c000000000008264] .start_secondary_prolog+0x10/0x14
next reply other threads:[~2010-04-14 20:23 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-14 20:23 Paul E. McKenney [this message]
-- strict thread matches above, loose matches on Subject: below --
2010-04-14 20:23 Lockdep splat in cpuset code acquiring alloc_lock Paul E. McKenney
2010-04-14 20:23 ` Paul E. McKenney
[not found] ` <20100414202347.GA26791-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2010-04-14 21:10 ` Paul Menage
2010-04-14 21:10 ` Paul Menage
2010-04-14 21:10 ` Paul Menage
[not found] ` <z2m6599ad831004141410tdc40feb0h529dabe4a39d67d5-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-04-15 6:39 ` Miao Xie
2010-04-15 6:39 ` Miao Xie
2010-04-15 6:39 ` Miao Xie
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