linux-kernel - lockdep warning on rt_mutex

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Date:	Fri, 17 Aug 2012 18:06:35 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: lockdep warning on rt_mutex_lock()

Greetings,

FYI, a lockdep warning:

[  293.123508] CPA self-test:
[  293.156399]  4k 3069 large 61 gb 0 x 3130[c0000000-cfffc000] miss 0
[  321.719166]  4k 65533 large 0 gb 0 x 65533[c0000000-cfffc000] miss 0
[  326.089755] ------------[ cut here ]------------
[  326.089755] WARNING: at /c/kernel-tests/src/linux/kernel/lockdep.c:3493 check_flags+0xaa/0x190()
[  326.089755] Hardware name: Bochs
[  326.089755] Pid: 8, comm: rcu_kthread Not tainted 3.6.0-rc1 #3
[  326.089755] Call Trace:
[  326.089755]  [<c102e02a>] warn_slowpath_common+0x7a/0xa0
[  326.089755]  [<c10732aa>] ? check_flags+0xaa/0x190
[  326.089755]  [<c10732aa>] ? check_flags+0xaa/0x190
[  326.089755]  [<c102e0ed>] warn_slowpath_null+0x1d/0x20
[  326.089755]  [<c10732aa>] check_flags+0xaa/0x190
[  326.089755]  [<c10743f4>] lock_is_held+0x34/0xb0
[  326.089755]  [<c105ebc1>] __might_sleep+0x31/0x1a0
[  326.089755]  [<c107c0fa>] ? debug_rt_mutex_init+0x1a/0x30
[  326.089755]  [<c1637f0a>] rt_mutex_lock+0x1a/0x40
[  326.089755]  [<c108e62a>] rcu_kthread+0xea/0x1a0
[  326.089755]  [<c108e540>] ? __rcu_process_callbacks+0xd0/0xd0
[  326.089755]  [<c104f7b7>] kthread+0x67/0x70
[  326.089755]  [<c104f750>] ? insert_kthread_work+0x80/0x80
[  326.089755]  [<c163999a>] kernel_thread_helper+0x6/0xd
[  326.089755] ---[ end trace c73785c318dc0a8f ]---
[  326.089755] possible reason: unannotated irqs-on.
[  326.089755] irq event stamp: 440724
[  326.089755] hardirqs last  enabled at (440723): [<c1638e76>] restore_all_notrace+0x0/0x18
[  326.089755] hardirqs last disabled at (440724): [<c1076b75>] debug_check_no_locks_freed+0x35/0x160
[  326.089755] softirqs last  enabled at (440722): [<c10367c7>] __do_softirq+0x2b7/0x370
[  326.089755] softirqs last disabled at (440715): [<c1003b14>] do_softirq+0x64/0xd0
[  327.331183]  4k 65533 large 0 gb 0 x 65533[c0000000-cfffc000] miss 0
[  327.339297] ok.                                                     

Thanks,
Fengguang

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