linux-kernel - Re: frequent lockups in 3.18rc4

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Date:	Sat, 15 Nov 2014 01:36:41 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dave Jones <davej@...hat.com>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: frequent lockups in 3.18rc4

On Fri, 14 Nov 2014, Dave Jones wrote:

> On Fri, Nov 14, 2014 at 11:55:30PM +0100, Thomas Gleixner wrote:
>  
>  > So this looks more like a smp function call fuckup.
>  > 
>  > I assume Dave is running that stuff on KVM. So it might be worth while
>  > to look at the IPI magic there.
> 
> no, bare metal.

Ok, but that does not change the fact that we are stuck in
smp_function_call land.

Enabling softlockup_all_cpu_backtrace will probably not help much as
we will end up waiting for csd_lock again :(

Is the machine still accesible when this happens? If yes, we might
enable a few trace points and functions and read out the trace
buffer. If not, we could just panic the machine and dump the trace
buffer over serial.

Sigh

	tglx
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