On 08/25/2010 08:19 AM, Avi Kivity wrote:
On 08/25/2010 04:15 PM, Boris Dolgov wrote:
Hello!
I try to use KVM on slackware host and centos5 guest with SMP.
When the server is idle, I get following errors in /var/log/messages:
http://pastebin.com/4RrMVuXq
Guest:
[root@centos-5-x64 ~]# uname -a
Linux centos-5-x64.slave 2.6.18-194.11.1.el5 #1 SMP Tue Aug 10
19:05:06 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
Start command: /usr/local/qemu/bin/qemu-system-x86_64 -name
centos-5-x64 -m 384 -smp 2 -cdrom
/root/CentOS-5.5-x86_64-netinstall.iso -drive
index=0,media=disk,if=virtio,file=/dev/mapper/vgvm-centos5x64,boot=on
-vnc 0.0.0.0:1 -net nic,macaddr=fe:e1:de:ad:57:22 -net
tap,script=/usr/local/qemu/bin/qemu-ifup -monitor stdio -usb
-usbdevice tablet -enable-kvm
Host:
root@superserver:~# uname -a
Linux superserver 2.6.35.3 #4 SMP Mon Aug 23 12:17:01 MSD 2010 x86_64
Intel(R) Xeon(R) CPU X3460 @ 2.80GHz GenuineIntel GNU/Linux
root@superserver:~# /usr/local/qemu/bin/qemu-system-x86_64 -version
QEMU PC emulator version 0.12.5 (qemu-kvm-0.12.5), Copyright (c)
2003-2008 Fabrice Bellard
What does it mean?
Looks like a bug in our USB emulation. Copying qemu-devel to see if
anyone has a clue.
USB tablet emulation would not do anything that causes QEMU to block so
it seems unlikely to me.
What's more likely is that since USB is polling based, statistically
speaking it's more likely that a VCPU is executing that call when the
soft lockup is detected.
Regards,
Anthony Liguori
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