Re: [Qemu-devel] usb-storage assertions

[Andrey Korolyov]

On Wed, Jan 13, 2016 at 7:13 PM, Gerd Hoffmann <address@hidden> wrote:
> 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,
>> > > >
>> > > > during regular operations within linux guest with USB EHCI frontend I
>> > > > am seeing process crashes with an assert during regular operations
>> > > > like dpkg install:
>> > > >
>> > > > hw/usb/dev-storage.c:334: usb_msd_handle_reset: Assertion `s->req ==
>> > > > ((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
>

Gerd, could you please check against NetBSD/FreeBSD guest? Both of
them are complaining about interrupt storm upon last cleanups/syncs
before reboot when using USB frontend as a disk and second assert is
triggered very frequently. I`ll re-try with 2.5 in a couple of days
for both cases.