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From: Gerd Hoffmann <kraxel@redhat.com>
Date: Wed, 13 Jan 2016 17:13:46 +0100
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Subject: Re: [Qemu-devel] usb-storage assertions
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To: "Daniel P. Berrange" <berrange@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, hdegoede@redhat.com, Andrey Korolyov <andrey@xdel.ru>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

On Di, 2016-01-12 at 14:56 +0000, Daniel P. Berrange wrote:
> On Tue, Jan 12, 2016 at 03:36:40PM +0100, Kevin Wolf wrote:
> > Am 12.01.2016 um 15:17 hat Gerd Hoffmann geschrieben:
> > > On Sa, 2016-01-09 at 20:34 +0300, Andrey Korolyov wrote:
> > > > Hello,
> > > >=20
> > > > during regular operations within linux guest with USB EHCI frontend=
 I
> > > > am seeing process crashes with an assert during regular operations
> > > > like dpkg install:
> > > >=20
> > > > hw/usb/dev-storage.c:334: usb_msd_handle_reset: Assertion `s->req =
=3D=3D
> > > > ((void *)0)' failed.

> >       <iotune>
> >         <total_bytes_sec>10000000</total_bytes_sec>
> >         <read_iops_sec>400000</read_iops_sec>
> >         <write_iops_sec>100000</write_iops_sec>
> >       </iotune>

> Yes, that works with QEMU and will map through to the -drive I/O
> tuning parameters.

Works, successfully slowing down things to the point that a git clone of
a linux kernel source tree from another machine in the same lan takes
hours instead of minutes.

That doesn't seem to be enough to trigger the asserts though :(
Things are very slow but rock solid ...

cheers,
  Gerd