Please, excuse my fault about lack of information and misclassification, also for my mistakes with English. This is my first bug report! I marked it as serious because I understood that would be a problem that could affect a lot of users, making their VM's not loadable.

I installed a month ago lenny from CD and then I did a dist-upgrade to squeeze. Since then, I use to do system upgrades once a week. I did the last upgrade just today and then I could not boot any of my KVM virtual machines.

before failure, KVM was version 1:0.12.5+dfsg-4
right now, KVM version is 1:0.12.5+dfsg-5

The guest OS are:

CentOS 5.5
Debian Lenny
FreeBSD 8.1
Windows XP


Well, I didn't use command line, but the AQEMU launcher. AQEMU executes following commands:

For CentOS 5.5:

/usr/bin/kvm -soundhw es1370 -k es -m 2047 -localtime -cdrom "/home/user/iso/CentOS-5.5-x86_64-bin-DVD/CentOS-5.5-x86_64-bin-DVD-1of2.iso" -hda "/home/user/Maquinas Virtuales/Discos/CENTOS" -boot c -net nic,vlan=0,macaddr=00:f6:14:b9:77:fe -net tap,vlan=0,ifname=tap0,script=no $*

For Debian Lenny:

/usr/bin/kvm -soundhw es1370 -k es -m 512 -localtime -cdrom "/home/user/Downloads/debian-506-i386-DVD-1.iso" -hda "/home/user/Maquinas Virtuales/Discos/DebianDisk" -boot c -net nic,vlan=0 -net tap,vlan=0,ifname=tap1,script=no $*

For FreeBSD 8.1:

/usr/bin/kvm -soundhw es1370 -k es -m 512 -localtime -cdrom "/home/user/iso/8.1-RELEASE-i386-all/FreeBSD-8.1-RELEASE-i386-dvd1.iso" -hda "/home/user/Maquinas Virtuales/Discos/FreeBSD" -boot c -net nic,vlan=0,macaddr=00:87:6f:63:23:69 -net tap,vlan=0,ifname=tap1,script=no $*

For Windows XP:

/usr/bin/kvm -k es -m 1024 -localtime -cdrom "/home/user/iso/windowsXPsp3.iso" -hda "/home/user/Maquinas Virtuales/Discos/XPsp3" -boot d -net nic,vlan=0 -net tap,vlan=0,ifname=tap2,script=no $*

Trying each of the above command in console, the error "segmentation fault" always appears and the guest virtual machines do not start. Dmesg gives:

[15103.291193] kvm[4093]: segfault at ffffff8c ip 00000000f71c6047 sp 00000000f675818c error 6 in libc-2.11.2.so[f7102000+140000] [15105.099445] kvm[4101]: segfault at ffffff8c ip 00000000f71ab047 sp 00000000f673d18c error 6 in libc-2.11.2.so[f70e7000+140000] [15106.803113] kvm[4109]: segfault at ffffff8c ip 00000000f7294047 sp 00000000f682618c error 6 in libc-2.11.2.so[f71d0000+140000] [15109.070782] kvm[4115]: segfault at ffffff8c ip 00000000f727c047 sp 00000000f680e18c error 6 in libc-2.11.2.so[f71b8000+140000]

regards!



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