linux-kernel - Re: scheduler problems in -next (was: Re: [PATCH 6.4 000/227] 6.4.7-rc1 review)

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Message-ID: <20230731145232.GM29590@hirez.programming.kicks-ass.net>
Date:   Mon, 31 Jul 2023 16:52:32 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Joel Fernandes <joel@...lfernandes.org>, paulmck@...nel.org,
        Pavel Machek <pavel@...x.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, patches@...ts.linux.dev,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        akpm@...ux-foundation.org, shuah@...nel.org, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, jonathanh@...dia.com,
        f.fainelli@...il.com, sudipm.mukherjee@...il.com,
        srw@...dewatkins.net, rwarsow@....de, conor@...nel.org,
        rcu@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: scheduler problems in -next (was: Re: [PATCH 6.4 000/227]
 6.4.7-rc1 review)

On Mon, Jul 31, 2023 at 07:48:19AM -0700, Guenter Roeck wrote:

> > I've taken your config above, and the rootfs.ext2 and run-sh from x86/.
> > I've then modified run-sh to use:
> > 
> >    qemu-system-x86_64 -enable-kvm -cpu host
> > 
> > What I'm seeing is that some boots get stuck at:
> > 
> > [    0.608230] Running RCU-tasks wait API self tests
> > 
> > Is this the right 'problem' ?
> > 
> 
> 
> Yes, exactly.

Excellent! Let me prod that with something sharp, see what comes
creeping out.