I believe I have just run into this bug. I figured now that 9.04 has
entered RC status I would upgrade a test server to figure out what
problems I would run into if and when upgrading. All of my domains only
had 1 VPCU so I don't think that is an issue. The problem is frequency
scaling. When frequency scaling was enabled my domains were crashing
randomly. Once disabled everything has been stable (at least so far).
This is clearly a regression from 8.10 and it would be good to either
fix it or make sure that people considering upgrading are aware of the
problem. I know those running servers will probably be more cautious in
upgrading but I suspect desktop and laptop users might be bitten by this
and complain. It would be good to try and isolate this issue and to
what degree hardware, kvm, and linux kernel contribute or interact to
cause it. It would also be good to determine if there are any other
workarounds such as using different kernel timers or options that would
enable users to continue to use cpu frequency scaling.
kvm 1:84+dfsg-0ubuntu10
linux-image-2.6.28-11-server 2.6.28-11.41
Here's my cpu data:
# lshw -class cpu
*-cpu
description: CPU
product: AMD Athlon(tm) 64 X2 Dual Core Processor 4600+
vendor: Advanced Micro Devices [AMD]
physical id: 4
bus info: c...@0
version: AMD Athlon(tm) 64 X2 Dual Core Processor 4600+
slot: Socket AM2
size: 2400MHz
capacity: 3800MHz
width: 64 bits
clock: 200MHz
capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic
sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext
fxsr_opt rdtscp x86-64 3dnowext 3dnow rep_good pni cx16 lahf_lm cmp_legacy svm
extapic cr8_legacy cpufreq
# cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 75
model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4600+
stepping : 2
cpu MHz : 2400.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm
3dnowext 3dnow rep_good pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy
bogomips : 4799.56
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc
processor : 1
vendor_id : AuthenticAMD
cpu family : 15
model : 75
model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4600+
stepping : 2
cpu MHz : 2400.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm
3dnowext 3dnow rep_good pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy
bogomips : 4799.56
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc
--
cpu frequency scaling causes multiple vcpu guests to panic
https://bugs.launchpad.net/bugs/246175
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