linux-kernel - Re: DEBUG_LOCKS_WARN_ON() within lockdep trace_hardirqs_on

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Date:	Mon, 25 Jul 2011 09:42:26 -0400
From:	Dave Jones <davej@...hat.com>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: DEBUG_LOCKS_WARN_ON() within lockdep trace_hardirqs_on_caller()

On Mon, Jul 25, 2011 at 03:05:14PM +0300, Sergey Senozhatsky wrote:
 > Hello,
 > 
 > Current 3.1.0-git3 (03873-g2c9c838), x86_64, has triggered an DEBUG_LOCKS_WARN_ON()
 > within trace_hardirqs_on_caller()
 > 
 > [ 4364.656167] ------------[ cut here ]------------
 > [ 4364.656186] WARNING: at kernel/lockdep.c:2532 trace_hardirqs_on_caller+0x6d/0x166()
 > [ 4364.656191] Hardware name: Aspire 5741G    
 > [ 4364.656264] Pid: 26796, comm: conftest Not tainted 3.1.0-dbg-03873-g2c9c838-dirty #652
 > [ 4364.656269] Call Trace:
 > [ 4364.656279]  [<ffffffff8103e970>] warn_slowpath_common+0x7e/0x96
 > [ 4364.656289]  [<ffffffff81477056>] ? __bad_area_nosemaphore+0x35/0x1b9
 > [ 4364.656296]  [<ffffffff8103e99d>] warn_slowpath_null+0x15/0x17
 > [ 4364.656303]  [<ffffffff81072770>] trace_hardirqs_on_caller+0x6d/0x166
 > [ 4364.656310]  [<ffffffff81072876>] trace_hardirqs_on+0xd/0xf
 > [ 4364.656317]  [<ffffffff81477056>] __bad_area_nosemaphore+0x35/0x1b9
 > [ 4364.656324]  [<ffffffff8147722f>] bad_area+0x45/0x4c
 > [ 4364.656333]  [<ffffffff814850f9>] do_page_fault+0x2da/0x48a
 > [ 4364.656343]  [<ffffffff810ec2d0>] ? do_brk+0x24e/0x2a2
 > [ 4364.656352]  [<ffffffff8124642d>] ? trace_hardirqs_off_thunk+0x3a/0x3c
 > [ 4364.656360]  [<ffffffff81482975>] page_fault+0x25/0x30
 > [ 4364.656366] ---[ end trace 9870b4ffc9ea6750 ]---

I hit this a few days ago too. http://lkml.org/lkml/2011/7/23/167
It started happening as soon as the x86 merge hit Linus tree (3.0 was fine).

	Dave

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