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From: "Pavel Dovgalyuk" <dovgaluk@ispras.ru>
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Date: Wed, 11 Jan 2017 10:10:59 +0300
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Subject: Re: [Qemu-devel] qemu-2.8-rc4 is broken
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To: 'Stefan Hajnoczi' <stefanha@gmail.com>
Cc: 'qemu-devel' <qemu-devel@nongnu.org>, 'Paolo Bonzini' <pbonzini@redhat.com>, 'Pavel Dovgalyuk' <pavel.dovgaluk@ispras.ru>, 'Peter Maydell' <peter.maydell@linaro.org>, =?UTF-8?Q?'Alex_Benn=C3=A9e'?= <alex.bennee@linaro.org>

> From: Stefan Hajnoczi [mailto:stefanha@gmail.com]
> On Wed, Dec 21, 2016 at 5:57 AM, Pavel Dovgalyuk <dovgaluk@ispras.ru> wrote:
> >> -----Original Message-----
> >> From: Stefan Hajnoczi [mailto:stefanha@gmail.com]
> >> On Tue, Dec 20, 2016 at 11:10 AM, Pavel Dovgalyuk <dovgaluk@ispras.ru> wrote:
> >> >> From: Stefan Hajnoczi [mailto:stefanha@gmail.com]
> >> >> On Tue, Dec 20, 2016 at 10:45:44AM +0300, Pavel Dovgalyuk wrote:
> >> >> > It also fails much earlier when I enable logs with "-d int -D log".
> >> >> >
> >> >> Looks like a heap corruption bug since free() is failing.
> >> >
> >> > Seems to be a race condition.
> >> > When I add logs into invalidate_page_bitmap, the bug disappears.
> >> > It seems that someone tries to free the same page bitmap twice and simultaneously.
> >>
> >> Does the following workaround prevent the crashes?
> >>
> >> -global apic-common.vapic=off
> >
> > Yes, this option helps.
> > Thank you.
> 
> Good news.  This can be fixed in 2.8.1 once someone finds a solution.

It seems that something still goes wrong.
I'm using this workaround, but there is a kind of deadlock in translation.
call_rcu_thread hangs at some moment in qemu_event_wait.

As far as I understand, it is used by QHT in translate-all.c.
I can't get more information yet, because logging makes everything too slow.

Pavel Dovgalyuk