linux-kernel - Re: tracing ring_buffer

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Date:	Thu, 24 May 2012 16:33:06 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dave Jones <davej@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kbuild@...r.kernel.org
Subject: Re: tracing ring_buffer_resize oops.

On Thu, 2012-05-24 at 16:18 -0400, Steven Rostedt wrote:
> On Thu, 2012-05-24 at 16:05 -0400, Dave Jones wrote:
> > On Thu, May 24, 2012 at 03:24:55PM -0400, Steven Rostedt wrote:
> >  > On Thu, 2012-05-24 at 15:11 -0400, Dave Jones wrote:
> >  > 
> >  > >  > Also, how reproducible is it? When it triggered for me, it was constant.
> >  > >  > Every boot and test failed. But after I did the make mrproper, I have
> >  > >  > not been able to trigger it again. This is why I put it down as a bad
> >  > >  > build.
> >  > > 
> >  > > happens every time for me so far.
> >  > 
> >  > Did you also do a make mrproper and try again?
> > 
> > ok, that's nasty.  Works fine after a make clean.
> > 
> 
> Thanks for verifying. I'm thinking this is a build bug. Something's not
> cleaning up properly. It may be with the recordmcount code. Perhaps
> objects needed to change where the mcount calls are and did not?
> 
> I'll try other things to see if I can trigger this again. Then I'll save
> off the build tree, do a make clean, rebuild, and compare what's
> different.
> 

I'm kicking off the ktest that initially caused this issue hoping that
it reproduces the bad tree again.

BTW, did you happen to upgrade gcc or anything? The ktest I run does
test against different gcc's and I don't think I had it do a make clean
between the switch. That may be the cause of this problem too :-?

-- Steve


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