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

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 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.

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