From: Thomas Gleixner <tglx@linutronix.de>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Peter Zijlstra <peterz@infradead.org>,
x86@kernel.org, Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, Borislav Petkov <bp@alien8.de>
Subject: Re: sched: Unexpected reschedule of offline CPU#2!
Date: Sat, 17 Aug 2019 22:21:48 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.21.1908172219470.1923@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20190816193208.GA29478@roeck-us.net>
On Fri, 16 Aug 2019, Guenter Roeck wrote:
> On Fri, Aug 16, 2019 at 12:22:22PM +0200, Thomas Gleixner wrote:
> > diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
> > index 75fea0d48c0e..625627b1457c 100644
> > --- a/arch/x86/kernel/process.c
> > +++ b/arch/x86/kernel/process.c
> > @@ -601,6 +601,7 @@ void stop_this_cpu(void *dummy)
> > /*
> > * Remove this CPU:
> > */
> > + set_cpu_active(smp_processor_id(), false);
> > set_cpu_online(smp_processor_id(), false);
> > disable_local_APIC();
> > mcheck_cpu_clear(this_cpu_ptr(&cpu_info));
> >
> No luck. The problem is still seen with this patch applied on top of
> the mainline kernel (commit a69e90512d9def6).
Yeah, was a bit too naive ....
We actually need to do the full cpuhotplug dance for a regular reboot. In
the panic case, there is nothing we can do about. I'll have a look tomorrow.
Thanks,
tglx
next prev parent reply other threads:[~2019-08-17 20:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-27 16:44 sched: Unexpected reschedule of offline CPU#2! Guenter Roeck
2019-07-29 9:35 ` Peter Zijlstra
2019-07-29 9:58 ` Thomas Gleixner
2019-07-29 10:13 ` Peter Zijlstra
2019-07-29 10:38 ` Thomas Gleixner
2019-07-29 10:47 ` Peter Zijlstra
2019-07-29 20:50 ` Guenter Roeck
2019-08-16 10:22 ` Thomas Gleixner
2019-08-16 19:32 ` Guenter Roeck
2019-08-17 20:21 ` Thomas Gleixner [this message]
2021-07-27 8:00 ` Henning Schild
2021-07-27 8:46 ` Jan Kiszka
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