linux-kernel - Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected)

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Date:	Tue, 20 Jan 2009 15:04:56 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Kevin Shanahan <kmshanah@...b.org.au>
CC:	Ingo Molnar <mingo@...e.hu>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Kevin Shanahan <kmshanah@...xo.wumi.org.au>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected)

Kevin Shanahan wrote:
> On Tue, 2009-01-20 at 12:35 +0100, Ingo Molnar wrote:
>   
>> * Kevin Shanahan <kmshanah@...b.org.au> wrote:
>>
>>     
>>> On Mon, 2009-01-19 at 22:45 +0100, Rafael J. Wysocki wrote:
>>>       
>>>> This message has been generated automatically as a part of a report
>>>> of regressions introduced between 2.6.27 and 2.6.28.
>>>>
>>>> The following bug entry is on the current list of known regressions
>>>> introduced between 2.6.27 and 2.6.28.  Please verify if it still should
>>>> be listed and let me know (either way).
>>>>
>>>>
>>>> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12465
>>>> Subject		: KVM guests stalling on 2.6.28 (bisected)
>>>> Submitter	: Kevin Shanahan <kmshanah@...b.org.au>
>>>> Date		: 2009-01-17 03:37 (3 days old)
>>>>         
>>> Yes, please keep this on the list.
>>>       
>> This only seems to occur under KVM, right? I.e. you tested it with -no-kvm 
>> and the problem went away, correct?
>>     
>
> Well, the I couldn't make the test conditions identical, but it the
> problem didn't occur with the test I was able to do:
>
>   http://marc.info/?l=linux-kernel&m=123228728416498&w=2
>
>   

Can you also try with -no-kvm-irqchip?

You will need to comment out the lines

    /* ISA IRQs map to GSI 1-1 except for IRQ0 which maps
     * to GSI 2.  GSI maps to ioapic 1-1.  This is not
     * the cleanest way of doing it but it should work. */

    if (vector == 0)
        vector = 2;

in qemu/hw/apic.c (should also fix -no-kvm smp).  This will change kvm 
wakeups to use signals rather than the in-kernel code, which may be buggy.

-- 
error compiling committee.c: too many arguments to function

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