Re: [Qemu-devel] QEMU 2.0 RC with Spice

[Rick Vernam]

On Wednesday 16 April 2014 10:44:36 Rick Vernam wrote:
> On Wednesday 16 April 2014 07:12:16 Richard Vernam wrote:
> > On Apr 16, 2014 3:07 AM, "Dr. David Alan Gilbert" <address@hidden>
> > 
> > wrote:
> > > * Rick Vernam (address@hidden) wrote:
> > > > On Tuesday 15 April 2014 19:25:22 Rick Vernam wrote:
> > > > > Looks like it's in Spice:
> > > <snip old backtrace without symbols>
> > > 
> > > > > I'll see if I can build spice with debugging symbols and what not
> > > > > and
> > 
> > write
> > 
> > > > > back with findings. Are others have problems with Qemu 2.0 RCs &
> > 
> > Spice?
> > 
> > > > > Here is how I started qemu with gdb:
> > > > > 
> > > > > QEMU_AUDIO_DRV=spice
> > > > > TMPDIR=/home/rick/qemu/hds gdb --args
> > 
> > /usr/local/bin/qemu-system-x86_64 -cpu
> > 
> > > > > host -enable-kvm \ -m 1536 -name Win7Pro64 -localtime -no-fd-bootchk
> > 
> > -smp
> > 
> > > > > cores=4 \
> > > > > -pidfile /home/rick/qemu/hds/win7pro64.pid \
> > > > > -drive
> > 
> > file=/home/rick/qemu/hds/win7pro64.qed,if=virtio,index=0,snapshot=on
> > 
> > > > > \ -vga qxl \
> > > > > -net nic,model=virtio -net user \
> > > > > -device
> > 
> > virtio-serial-pci,id=virtio-serial0,max_ports=16,bus=pci.0,addr=0x5
> > 
> > > > > \ -chardev spicevmc,name=vdagent,id=vdagent \
> > > > > -device
> > 
> > virtserialport,nr=1,bus=virtio-serial0.0,chardev=vdagent,name=com.redhat.s
> > p
> > 
> > > > > ice.0 \ -spice port=1247,disable-ticketing \
> > > > > -monitor telnet:localhost:12471,server,nowait \
> > > > > -drive if=none,id=cd,file=/dev/sg1 \
> > > > > -device virtio-scsi-pci,id=scsi \
> > > > > -device scsi-generic,drive=cd \
> > > > > -balloon virtio \
> > > > > -soundhw hda \
> > > > > -device usb-ehci
> > > > > 
> > > > > 
> > > > > Thanks,
> > > > > -Rick
> > > > > 
> > > > > On Tuesday 15 April 2014 15:22:04 Dr. David Alan Gilbert wrote:
> > > > > > * Rick Vernam (address@hidden) wrote:
> > > > > > > I have been trying out the 2.0 RCs, and I've noticed that when I
> > 
> > use
> > 
> > > > > > > spice
> > > > > > > qemu aborts when I reboot the VM.  This occurs on Win XP guest,
> > 
> > Win 7
> > 
> > > > > > > (64-bit) guest and Win 8 (64-bit) guest.
> > > > > > > Is this something that anybody else experiences?
> > > > > > > I don't care to divert anybody's energy if this a spice thing -
> > 
> > how best
> > 
> > > > > > > to
> > > > > > > determine this?
> > > > > > 
> > > > > > You say qemu aborts; can you get a backtrace and the abort
> > > > > > message?
> > > > > > 
> > > > > > Dave
> > > > > > --
> > > > > > Dr. David Alan Gilbert / address@hidden / Manchester, UK
> > > > 
> > > > sorry, for top posting my last response.  and also sorry for not
> > 
> > noticing that I had let the binaries get stripped previously.
> > 
> > > > Here with qemu-system-x86_64 not stripped, and spice lib not stripped:
> > > > 
> > > > Program received signal SIGSEGV, Segmentation fault.
> > > > 0x00007ffff211eae5 in spice_char_device_write_to_device
> > 
> > (dev=0x55555687bcf0) at char_device.c:443
> > 
> > > > 443         sif = SPICE_CONTAINEROF(dev->sin->base.sif,
> > 
> > SpiceCharDeviceInterface, base);
> > 
> > > > (gdb) bt
> > > > #0  0x00007ffff211eae5 in spice_char_device_write_to_device
> > 
> > (dev=0x55555687bcf0) at char_device.c:443
> > 
> > > > #1  0x00007ffff211fd81 in spice_char_device_start (dev=0x55555687bcf0)
> > 
> > at char_device.c:798
> > 
> > > > #2  0x00007ffff2171f95 in spice_server_vm_start (s=0x5555561d4360) at
> > 
> > reds.c:4520
> > 
> > > > #3  0x00005555556a1119 in qdev_reset_one (dev=<optimized out>,
> > 
> > opaque=<optimized out>) at hw/core/qdev.c:240
> > 
> > > > #4  0x00005555556a0958 in qbus_walk_children (bus=0x5555567576a0,
> > 
> > pre_devfn=0x0, pre_busfn=0x0, post_devfn=0x5555556a1100 <qdev_reset_one>,
> > post_busfn=0x55555569f060 <qbus_reset_one>, opaque=0x0) at
> > hw/core/qdev.c:369
> > 
> > > > #5  0x00005555556a0878 in qdev_walk_children (dev=0x55555677c0b0,
> > 
> > pre_devfn=0x0, pre_busfn=0x0, post_devfn=0x5555556a1100 <qdev_reset_one>,
> > post_busfn=0x55555569f060 <qbus_reset_one>, opaque=0x0) at
> > hw/core/qdev.c:403
> > 
> > > > #6  0x00005555556a0958 in qbus_walk_children (bus=0x5555567459c0,
> > 
> > pre_devfn=0x0, pre_busfn=0x0, post_devfn=0x5555556a1100 <qdev_reset_one>,
> > post_busfn=0x55555569f060 <qbus_reset_one>, opaque=0x0) at
> > hw/core/qdev.c:369
> > 
> > > > #7  0x00005555557d717a in qemu_devices_reset () at vl.c:1867
> > > > #8  qemu_system_reset (address@hidden) at vl.c:1880
> > > > #9  0x00005555555f9e2f in main_loop_should_exit () at vl.c:2015
> > > > #10 main_loop () at vl.c:2055
> > > > #11 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized
> > 
> > out>) at vl.c:4507
> > 
> > > > Thanks, and what can I do to provide more info?
> > > 
> > > I don't know much about spice; I've added address@hidden to cc who
> > 
> > knows spice.
> > 
> > > Can you clarify a bit more about which spice version you're using and
> > 
> > anything else
> > 
> > > about your setup that might be relevant.
> > > 
> > > Dave
> > > --
> > > Dr. David Alan Gilbert / address@hidden / Manchester, UK
> > 
> > Spice is 0.12.4 via Gentoo, which makes me wonder if gentoo is applying
> > any
> > patches over vanilla spice.  If they are, I'll grab vanilla spice.
> > 
> > This happens during reboot, seemingly right at the transition between
> > shutting down and starting back up; and so I wonder if it crashes during
> > shutdown too, and I just didn't notice since I was shutting down anyway.
> > I'll check on this as well.
> 
> I grabbed spice from spice-space, configured like so (copied verbatim from
> how gentoo was running configure): ./configure --prefix=/usr
> --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
> --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share
> --sysconfdir=/etc --localstatedir=/var/lib --libdir=/usr/lib64
> --disable-silent-rules --disable-dependency-tracking --disable-static
> --disable-tunnel --enable-client --without-sasl --disable-smartcard
> --disable-gui --disable-static-linkage
> 
> I only influenced the CFLAGS by adding a -g3 & -march=native, which is first
> gen i7. Crash is the same...
> This only happens on guest system reboot - qemu exits normally on guest
> system shutdown.

I wrote a trivial patch to fix the crash.  I know extremely little about the 
innards of both QEmu & spice, so I haven't a clue what the consequences of 
this patch is, except that I don't crash anymore.
For the record, here is the post to the spice list with the patch:
http://lists.freedesktop.org/archives/spice-devel/2014-April/016652.html