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Date: Thu, 4 Sep 2014 13:38:00 -0300
From: Marcelo Tosatti <mtosatti@redhat.com>
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Subject: Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration
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To: Andrey Korolyov <andrey@xdel.ru>
Cc: Amit Shah <amit.shah@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Marcin =?utf-8?Q?Gibu=C5=82a?= <m.gibula@beyond.pl>, Fam Zheng <famz@redhat.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

On Sun, Aug 24, 2014 at 10:51:38PM +0400, Andrey Korolyov wrote:
> On Sun, Aug 24, 2014 at 8:57 PM, Andrey Korolyov <andrey@xdel.ru> wrote:
> > On Sun, Aug 24, 2014 at 8:35 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
> >> Il 24/08/2014 18:19, Andrey Korolyov ha scritto:
> >>> Sorry, I was a bit inaccurate in my thoughts at Fri about necessary
> >>> amount of work, patch lays perfectly on 3.10 with bit of monkey
> >>> rewrites. The attached one fixed problem for me - it represents
> >>> 0b10a1c87a2b0fb459baaefba9cb163dbb8d3344,
> >>> 0bc830b05c667218d703f2026ec866c49df974fc,
> >>> 44847dea79751e95665a439f8c63a65e51da8e1f and
> >>> 673f7b4257a1fe7b181e1a1182ecc2b6b2b795f1.
> >>
> >> So, with these changes, Marcelo's patch does not hang up your guest anymore?
> >>
> >> Paolo
> >>
> >
> > If I may reword, Marcelo`s proposed states sync with revert-revert of
> > agraf`s patch, does not break anything for Windows (migration works
> > well for any variant of emulator with modified kernel modules). Let me
> > check if initially reported issue (lost I/O interrupts) is gone for
> > the current situation (patched kernel plus Marcelo` patch).
> 
> 
> patched kernel + any 2.1 variant + Windows = works
> patched kernel + patched 2.1 + Linux + disk workload = works fine

Andrey,

What patch is this again ?

> bare kernel + any 2.1 variant + Windows = disk stale
> bare kernel + proposed patch from Marcelo + Linux + disk workload =
> works fine (bare kernel + 2.1 release works at this point as tested
> earlier)
> 
> Also guest 3.10.52 caused literally a rain of WTFs crashing emulator
> with an emulation error in every case tested with live migration...
> 3.10.11 works fine. There will be another report soon I suppose though
> it is nearly impossible to do a proper bisection in a sane time.