[Bug 333201] Re: Virtual machine soft lockup - CPU gets stuck for XX seconds

[Marcus Bointon]

Sorry I didn't see your question earlier.
I'm now running the release version of 10.04:
Linux 2.6.32-21-server #32-Ubuntu SMP Fri Apr 16 09:17:34 UTC 2010 x86_64 GNU/Linux
This particular machine isn't very high powered, but it should be at least usable. It has a single quad-core L5320 Xeon (with vmx), 10Gb RAM, SATA soft raid-1, no other major processes (not even apache), load average < 0.1. FWIW the host OS reboots in under a minute.

Here's CPUinfo on one core:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU           L5320  @ 1.86GHz
stepping        : 7
cpu MHz         : 1866.966
cache size      : 4096 KB
physical id     : 1
siblings        : 4
core id         : 0
cpu cores       : 4
apicid          : 4
initial apicid  : 4
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 syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx tm2 ssse3 cx16 xtpr pdcm dca lahf_lm tpr_shadow
bogomips        : 3733.93
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

I've attached a screenshot of the kind of thing it's doing. It takes
about 20 minutes to even get as far as this screen though! It's
completely unusable - after 50 mins it reached a login prompt, but typed
input eitehr doesn't work or is too slow to tell.

This is the command I gave to vmbuilder (which can't get much more
vanilla!)

vmbuilder kvm ubuntu \
--suite lucid \
--flavour virtual \
--arch amd64 \
--libvirt qemu:///system \
--hostname vm1 \
--user user \
--name user \
--pass default \
--ip 192.168.0.100 \
--dest /root/vm1

and kvm is run from its generated run.sh file with this:

exec kvm -m 128 -smp 1 -drive file=tmpkJv9OP.qcow2 "$@"

I don't know if this problem is because vmbuilder built a bad image, the
config is bad, or because kvm isn't working right.

** Attachment added: "kvm failing to run"
   http://launchpadlibrarian.net/47820425/Screen%20shot%202010-05-04%20at%2022.07.24.png

-- 
Virtual machine soft lockup - CPU gets stuck for XX seconds
https://bugs.launchpad.net/bugs/333201
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