linux-kernel - Re: [RFC][PATCH 12/12] perf: Collapse and fix event_function

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Message-ID: <20160218074620.GP6357@twins.programming.kicks-ass.net>
Date:	Thu, 18 Feb 2016 08:46:20 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	mingo@...nel.org, alexander.shishkin@...ux.intel.com,
	eranian@...gle.com, linux-kernel@...r.kernel.org, vince@...ter.net,
	dvyukov@...gle.com, andi@...stfloor.org, jolsa@...hat.com
Subject: Re: [RFC][PATCH 12/12] perf: Collapse and fix event_function_call()
 users

On Wed, Feb 17, 2016 at 05:38:43PM -0500, Sasha Levin wrote:
> Hey Peter,
> 
> I seem to be hitting a warning added by this patch:
> 
> [  258.890172] WARNING: CPU: 5 PID: 14801 at kernel/events/core.c:226 event_function+0x3a7/0x550()

Yes, I've been chasing this one for the past few days.

I have a bunch of traces that make absolutely no sense what so ever, and
a patch that appears to make it go away, but I'm not confident.

I'll cleanup and share what I have.