linux-kernel - Re: [PATCH 0/6] ftrace: port to the new ring

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Message-ID: <alpine.DEB.1.10.0809300804390.30533@gandalf.stny.rr.com>
Date:	Tue, 30 Sep 2008 08:04:56 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>
Subject: Re: [PATCH 0/6] ftrace: port to the new ring_buffer


On Tue, 30 Sep 2008, Ingo Molnar wrote:

> 
> > -tip testing found that tip/tracing/ring-buffer causes a new lockdep 
> > splat:
> 
> FYI, triggered on a number of 32-bit test-systems as well - see the log 
> below.
> 
> 	Ingo
> 
> [    0.564008] calling  tracer_alloc_buffers+0x0/0x16b @ 1
> [    0.574504] ------------[ cut here ]------------
> [    0.576002] WARNING: at kernel/lockdep.c:2880 check_flags+0x5a/0x155()
> [    0.576002] Modules linked in:
> [    0.576002] Pid: 1, comm: swapper Not tainted 2.6.27-rc8-tip-00915-g8cb18a9-dirty #37502
> [    0.576002]  [<c01536c4>] warn_on_slowpath+0x46/0x6a
> [    0.576002]  [<c0170b14>] ? trace_hardirqs_off+0xb/0xd
> [    0.576002]  [<c0173294>] ? __lock_acquire+0xa91/0xaad
> [    0.576002]  [<c01a6470>] ? get_page_from_freelist+0x37b/0x455
> [    0.576002]  [<c0170044>] ? __raw_spin_is_locked+0x15/0x18
> [    0.576002]  [<c0171cf8>] ? find_usage_backwards+0x21/0xe1
> [    0.576002]  [<c019f852>] ? time_hardirqs_off+0xe/0x1f
> [    0.576002]  [<c0170a66>] ? trace_hardirqs_off_caller+0x15/0xb8
> [    0.576002]  [<c0170b14>] ? trace_hardirqs_off+0xb/0xd

Again, I think this is the same issue with the raws?

-- Steve

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