linux-kernel - Re: [PATCH v3 3/5] x86: fix list corruption on CPU hotplug

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Message-ID: <20140414100457.GD731@gmail.com>
Date:	Mon, 14 Apr 2014 12:04:57 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Igor Mammedov <imammedo@...hat.com>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org, bp@...e.de,
	paul.gortmaker@...driver.com, JBeulich@...e.com, prarit@...hat.com,
	drjones@...hat.com, toshi.kani@...com, riel@...hat.com,
	gong.chen@...ux.intel.com, andi@...stfloor.org, lenb@...nel.org,
	rjw@...ysocki.net, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v3 3/5] x86: fix list corruption on CPU hotplug


* Igor Mammedov <imammedo@...hat.com> wrote:

> On Mon, 14 Apr 2014 11:19:54 +0200
> Ingo Molnar <mingo@...nel.org> wrote:
> 
> > 
> > * Igor Mammedov <imammedo@...hat.com> wrote:
> > 
> > > currently if AP wake up is failed, master CPU marks AP as not present
> > > in do_boot_cpu() by calling set_cpu_present(cpu, false).
> > > That leads to following list corruption on the next physical CPU
> > > hotplug:
> > 
> > Shouldn't this fix precede the main change to the smp bootup logic?
> > 
> > Can this bug trigger with current upstream kernels?
> That's not impossible, tests showed that with current kernel there will
> be other problems due wild AP running around.
> 
> I'll reorder patch anyway.

So, could you please first make sure that with only the fixes applied 
there's no problems left?

Only then should we apply the patch that adds/tweaks the timeout/etc.

Thanks,

	Ingo
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