Re: Another RCU trace. (3.10-rc5)

From: Dave Jones
Date: Mon Jun 10 2013 - 17:54:37 EST


On Mon, Jun 10, 2013 at 05:37:36PM -0400, Steven Rostedt wrote:
> On Mon, 2013-06-10 at 14:18 -0700, Paul E. McKenney wrote:
> > On Mon, Jun 10, 2013 at 05:01:23PM -0400, Dave Jones wrote:
> > > On Mon, Jun 10, 2013 at 01:33:55PM -0700, Paul E. McKenney wrote:
> > >
> > > > > I saw some of Steven's patches get merged on Friday, is there anything else
> > > > > outstanding that didn't make it in yet that I could test ?
> > > > > Or is this another new bug ?
> > > >
> > > > I have three fixes queued up at:
> > > >
> > > > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/urgent
> > > >
> > > > Kind of hard to tell whether they are relevant given the interleaved
> > > > stack traces, but can't hurt to try them out.
> > >
> > > Here's another. Looks different.
> >
> > I bet that commit d6284099 (trace: Allow idle-safe tracepoints to be
> > called from irq) from the above git archive fixes this one. Just don't
> > ask how much I am willing to bet. ;-)
>
> Don't bet much ;-) This has nothing to do with tracepoints. It's due to
> the function tracer.

dammit, 20 minutes after I finally cloned the repo.
Can we go back to posting diffs instead of hashes please ?

So while updating my list of bugs I've found this cycle, I noticed
I'd already posted this one a month ago on -rc2.
https://lkml.org/lkml/2013/5/21/327
which led us to this patch https://lkml.org/lkml/2013/5/24/379
After which I hit a bunch of what seem to be other RCU related bugs.

So maybe that patch was a winner after all and got dropped ?

Dave

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