linux-kernel - Re: [PATCH 0/6] A few cpuidle vs rcu fixes

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Date:   Wed, 25 Jan 2023 09:36:08 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, will@...nel.org, boqun.feng@...il.com,
        tglx@...utronix.de, bp@...en8.de, dave.hansen@...ux.intel.com,
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Subject: Re: [PATCH 0/6] A few cpuidle vs rcu fixes

On Wed, Jan 25, 2023 at 10:31:41AM +0100, Peter Zijlstra wrote:
> On Tue, Jan 24, 2023 at 04:34:23PM +0000, Mark Rutland wrote:
> > Hi Peter,
> > 
> > On Mon, Jan 23, 2023 at 09:50:09PM +0100, Peter Zijlstra wrote:
> > > 0-day robot reported graph-tracing made the cpuidle-vs-rcu rework go splat.
> > 
> > Do you have a link toe the splat somewhere?
> > 
> > I'm assuming that this is partially generic, and I'd like to make sure I test
> > the right thing on arm64. I'll throw my usual lockdep options at the ftrace
> > selftests...
> 
> 0-day triggered this by running tools/testing/selftests/ftrace/ftracetest,
> which is what I've been using to reproduce.
> 
> If that don't work for you I can try and dig out the 0day email to see
> if it has more details on.

I had a go running those on arm64, but got different splats (as per my other
replies), so I just wanted to see the backtraces and/or config to check I
wasn't missing something due to CONFIG_* or arch differences.

If you have the email to hand, that'd be great, but don't worry too much about
it!

Thanks,
Mark.