linux-kernel - Re: [tip: sched/core] sched/core: Initialize the idle task with preemption disabled

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Date:   Wed, 7 Jul 2021 08:31:02 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Valentin Schneider <valentin.schneider@....com>
Cc:     Alexey Kardashevskiy <aik@...abs.ru>,
        Frederic Weisbecker <frederic@...nel.org>,
        linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org
Subject: Re: [tip: sched/core] sched/core: Initialize the idle task with
 preemption disabled

On Wed, Jul 07, 2021 at 03:57:17PM +0100, Valentin Schneider wrote:
> On 08/07/21 00:35, Alexey Kardashevskiy wrote:
> > On 08/07/2021 00:14, Guenter Roeck wrote:
> >>
> >> Can you reproduce the problem with a powerpc qemu emulation ?
> >> If so, how do you reproduce it there ? Reason for asking is that I don't
> >> see
> >> the problem with any of my powerpc emulations, and I would like to add test
> >> case(s) if possible.
> >
> > I can reproduce the problem on powerpc easily - qemu with "-smp 2" does it.
> >
> 
> So on powerpc I'm chasing a slightly different problem, reported at
> [1]. I couldn't get it to trigger on qemu for powerpc64, and I'm still
> struggling with powerpc. Could you please share you qemu invocation &
> kernel .config? Thanks.
> 
Same here. Actually, worse: All 32-bit ppc emulations I tried to
run with more than 1 CPU crash when bringing up the 2nd CPU,
and that even happens with 5.13.

So, yes, please share your qemu command line and the kernel
configuration.

Thanks,
Guenter