linux-kernel - WARNING at lockdep.c:956 _

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Date:	Tue, 11 Sep 2012 14:30:00 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: WARNING at lockdep.c:956 __bfs()

Greetings,

An one-shot warning that's rather hard to reproduce..

[   40.522075] ------------[ cut here ]------------
[   40.522796] WARNING: at /c/kernel-tests/src/i386/kernel/lockdep.c:956 __bfs+0x1a8/0x1d0()
[   40.523584] Modules linked in:
[   40.523584] Pid: 1, comm: init Not tainted 3.6.0-rc4-00155-gcaa631e #190
[   40.523584] Call Trace:
[   40.523584]  [<c1029fb4>] warn_slowpath_common+0x64/0x80
[   40.523584]  [<c107d2a8>] ? __bfs+0x1a8/0x1d0
[   40.523584]  [<c107d2a8>] ? __bfs+0x1a8/0x1d0
[   40.523584]  [<c1029ff2>] warn_slowpath_null+0x22/0x30
[   40.523584]  [<c107d2a8>] __bfs+0x1a8/0x1d0
[   40.523584]  [<c107d020>] ? noop_count+0x10/0x10
[   40.523584]  [<c107f063>] check_usage_backwards+0x63/0xe0
[   40.523584]  [<c100e8b0>] ? save_stack_trace+0x30/0x50
[   40.523584]  [<c107f000>] ? check_usage_forwards+0xe0/0xe0
[   40.523584]  [<c107f7f9>] mark_lock+0x139/0x260
[   40.523584]  [<c107f000>] ? check_usage_forwards+0xe0/0xe0
[   40.523584]  [<c107fe50>] __lock_acquire+0x530/0x15f0
[   40.523584]  [<c1128e10>] ? shrink_dcache_parent+0x60/0x2d0
[   40.523584]  [<c11b8fde>] ? do_raw_spin_lock+0x16e/0x190
[   40.523584]  [<c1081470>] lock_acquire+0x80/0x190
[   40.523584]  [<c112850d>] ? d_drop+0x1d/0x40
[   40.523584]  [<c129f263>] _raw_spin_lock+0x43/0x50
[   40.523584]  [<c112850d>] ? d_drop+0x1d/0x40
[   40.523584]  [<c112850d>] d_drop+0x1d/0x40
[   40.523584]  [<c116718f>] proc_flush_task+0x8f/0x190
[   40.523584]  [<c102e444>] ? release_task+0x94/0x590
[   40.523584]  [<c102e46a>] release_task+0xba/0x590
[   40.523584]  [<c102e3c0>] ? release_task+0x10/0x590
[   40.523584]  [<c10eff51>] ? might_fault+0x91/0xa0
[   40.523584]  [<c102f6d7>] wait_consider_task.part.24+0xd97/0xed0
[   40.523584]  [<c102f008>] ? wait_consider_task.part.24+0x6c8/0xed0
[   40.523584]  [<c102f8f0>] do_wait+0xe0/0x300
[   40.523584]  [<c110eec0>] ? do_sync_write+0xd0/0xd0
[   40.523584]  [<c1030de0>] sys_waitid+0x70/0x170
[   40.523584]  [<c102dd80>] ? task_stopped_code+0x50/0x50
[   40.523584]  [<c12a74c3>] sysenter_do_call+0x12/0x3c

Thanks,
Fengguang

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