[Xci-devel] qemu-dm segfault at pv guest system

[Kornelius Prell <kornelius.prell@xxxxxxxxxxxxxx>]

Hello,

I set the vnc option in a pv domain config file (Ubuntu 9.04 32 bit with XCI kernel/initrd) to test qemu-dm and its framebuffer support (see below for full config file).
Unfortunately it runs into a segmentation fault as soon as I try to access it via a vnc viewer (dom0 dmesg):


[  156.326275] qemu-dm[1500]: segfault at 494 ip 080c2f7a sp bff11b40 error 4 in qemu-dm[8048000+10d000]

Debugging with gdb shows the cause of the error in the function xenfb_update in /xenclient-ioemu/hw/xenfb.c 


The parameter passed to the function is 0, but as it should be a pointer to the xenfb device it results later in a segmentation fault (as the height and the width of it are tested to be not 0).

Hower using xenconsole to connect to the domain reveals that xenbus tries to connect to the vfb device during the boot process, but fails (domU console):


[    5.678469] XENBUS: Waiting for devices to initialise: 295s...290s...285s...(...)...0s...
[  300.588592] XENBUS: Timeout connecting to device: device/vfb/0 (local state 3, remote state 1)

Looking at /proc/fb however shows its existence:


cat /proc/fb
0 VGA16 VGA
1 xen

pv dom config file:
uuid = 01000000-0000-0000-0000-102130000004
hvm = false
memory = 1024
debug = true
kernel = /boot/vmlinuz-xci
initrd = /boot/initrd.img-xci


cmdline = root=/dev/sda1 video=xenfb
disk = /dev/sda:file:sda:w:disk
vif = bridge=xenbr0
serial = /dev/tty2
extra-hvm = dom0-input=1
extra-hvm = intel=
extra-hvm = std-vga=

Am I missing essential parameters?

Thanks for the help!

regards,
Kornelius
_______________________________________________
Xci-devel mailing list
Xci-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/mailman/listinfo/xci-devel