[Qemu-devel] Re: BUG: soft lockup - CPU#0 stuck for 13s! [swapper:0]

[Avi Kivity <avi@redhat.com>]

  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.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.