Hi,

Since I upgraded my ubuntu machine to 8.04, 
/usr/local/bin/qemu-system-x86_64 segfaults when starting with -net 
tap,ifname=tap0 flags. Of course, it's been recompiled.

$ sudo /usr/local/bin/qemu-system-x86_64 /data/virt/netbsd.img -net 
nic,macaddr=00:56:01:02:03:04 -net tap,ifname=tap0,script=/etc/qemu-ifup
Segmentation fault

I see the same behaviour with any NIC, and for kvm from -62 to -67 (I 
tested each version). 
Downgrading to kvm-61 fixes the problem. It seems like there's a similar 
bug report here: 
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=476469

The VM also start correctly with qemu.

$ modinfo kvm-intel
filename:       /lib/modules/2.6.24-16-generic/extra/kvm-intel.ko
license:        GPL
author:         Qumranet
version:        kvm-67
srcversion:     2E2C88C6F09E216FDAA6797
depends:        kvm
vermagic:       2.6.24-16-generic SMP mod_unload 586
parm:           bypass_guest_pf:bool
parm:           enable_vpid:bool
parm:           flexpriority_enabled:bool

$ uname -a
Linux tatooine 2.6.24-16-generic #1 SMP Thu Apr 10 13:23:42 UTC 2008 i686 
GNU/Linux

$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Core(TM)2 CPU          6300  @ 1.86GHz
stepping        : 6
cpu MHz         : 1596.000
cache size      : 2048 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm 
constant_tsc arch_perfmon pebs bts pni monitor ds_cpl vmx est tm2 ssse3 
cx16 xtpr lahf_lm
bogomips        : 3736.56
clflush size    : 64

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Core(TM)2 CPU          6300  @ 1.86GHz
stepping        : 6
cpu MHz         : 1596.000
cache size      : 2048 KB
physical id     : 0
siblings        : 2
core id         : 1
cpu cores       : 2
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm 
constant_tsc arch_perfmon pebs bts pni monitor ds_cpl vmx est tm2 ssse3 
cx16 xtpr lahf_lm
bogomips        : 3733.37
clflush size    : 64

Interesting packages

ii  bridge-utils                                 1.2-2
ii  iproute                                      20071016-2ubuntu1
ii  libc6                                        2.7-10ubuntu3

Hope this helps,

regards

----------------------------------------
Emile "iMil" Heitor <[EMAIL PROTECTED]>                                  _
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