linux-kernel - Re: smp_call_function

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Date:	Mon, 23 Feb 2015 11:01:09 -0300
From:	Rafael David Tinoco <inaddy@...ntu.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jens Axboe <axboe@...nel.dk>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Gema Gomez <gema.gomez-solano@...onical.com>,
	chris.j.arges@...onical.com
Subject: Re: smp_call_function_single lockups

On Thu, Feb 19, 2015 at 2:14 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:

>
> Hmm. Still just the stack trace for the CPU that is blocked (CPU0), if
> you can get the core-file to work and figure out where the other CPU
> is, that would be good.
>

This is v3.19 + your patch (smp acquire/release)
- (nested kvm with 2 vcpus on top of proliant with x2apic cluster mode
and acpi_idle)

* http://people.canonical.com/~inaddy/lp1413540/STACK_TRACE.txt
http://people.canonical.com/~inaddy/lp1413540/BACKTRACES.txt
http://people.canonical.com/~inaddy/lp1413540/FOREACH_BT.txt

* It looks like we got locked because of reentrant flush_tlb_* through
smp_call_*
but I'll leave it to you. let me know if you need any more info..

-
Rafael Tinoco
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