Re: [Qemu-devel] Qemu 2.0 regression with xen: qemu crash on any domUs S.O. start

[Fabio Fantoni <fabio.fantoni@m2r.biz>]

Il 02/04/2014 18:05, Anthony PERARD ha scritto:
> On Tue, Apr 01, 2014 at 05:01:18PM +0200, Fabio Fantoni wrote:
>> Today I tried latest qemu 2.0 compiled from git (commit
>> 63678e17cf399ff81b93417fe7bee8d6ef6b6b1b) on this dom0:
>> Debian 7 (Wheezy) 64 bit with kernel from package linux-image-3.2.0-4-amd64
>> version 3.2.54-2 and all dependency packages for xen, spice and usb
>> redirection.
>> Seabios 1.7.3-3, spice 0.12.4-0nocelt2 and usbredir 0.6-2 compiled from
>> debian unstable sources.
>> The xen-unstable upstream commit is
>> 4787f667bcee205c56a27da59b766a53e1e929eb, plus these patches not upstream:
>> tools: various things just to build test
>> tools: Improve make debball
>> libxl: Add qxl vga interface support for upstream qemu
>> libxl: add basic spice support for pv domUs
> Have you try without your last two patches? Or even any patch at all?

I did some thing with same build and qemu 1.6 the day before and all was 
working, the problem start with change of qemu with 2.0.
I also tried disabling all things of my patches.

>
>> Qemu crashes always on domU S.O. start, on both pv and hvm domUs.
>>
>> Same dom0 with qemu 1.6 from xen-unstable repository used for some tests
>> yesterday and was full working.
>> I also update seabios to 1.7.4-4 compiled from debian unstable sources but
>> the problem persists.
>>
>> I looked on dom0 logs, qemu logs and xl dmesg and I found only a qemu
>> segfault related on each domU in dom0 syslog, for example the latest:
>> [  844.273170] qemu-system-i38[3545]: segfault at 8 ip 00007fa905dcc4c1 sp
>> 00007fff41220810 error 4 in qemu-system-i386[7fa905ad5000+598000]
>>
>> If you need more informations, tests and/or logs tell me and I'll post them.
> What is in your guest config files?
>

The cfg of test with full backtrace on other my mail:
> name='wheezy'
> memory=1024
> vcpus=2
> device_model_override="/usr/lib/xen/bin/qemu-gdb"
> disk=['/mnt/vm/disks/wheezy.disk1.xm,raw,xvda,rw']
> vif=['bridge=xenbr0']
> vfb=['vnc=1,vncunused=1,vnclisten=0.0.0.0,keymap=it']
> #vfb=['vnc=0']
> #vnc=0
> #vncunused=1
> #keymap="it"
> #vnclisten=0.0.0.0
> #spice=1
> #spicehost="0.0.0.0"
> #spiceport=6002
> #spicepasswd="test"
> #bootloader='pygrub'
> # Only for installation
> #kernel = "/boot/domu/wheezy/vmlinuz"
> kernel = "/mnt/vm/pvgrub2/grub/pvgrub2.xen"
> #ramdisk = "/boot/domu/wheezy/initrd.gz"
> #extra = "debian-installer/exit/always_halt=true -- quiet console=tty0"