Comment 5 for bug 1431473

Reproduced with latest upstream kernel from:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.0-rc4-vivid/
linux-image-4.0.0-040000rc4-generic 4.0.0-040000rc4.201503152135
Linux vivid-test 4.0.0-040000rc4-generic #201503152135 SMP Mon Mar 16 01:36:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Does not reproduce (what I want) with:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.11.11-trusty/
linux-image-3.13.11-03131111-generic 3.13.11-03131111.201411111336
Linux vivid-test 3.13.11-03131111-generic #201411111336 SMP Tue Nov 11 18:37:52 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

All on Vivid, using cloud image daily build on amd64 serial 20150314.1. Canonical engineers: it seems you can reproduce on lcy01.

$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Duo CPU T7700 @ 2.40GHz
stepping : 11
microcode : 0x1
cpu MHz : 2400.084
cache size : 4096 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
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 mmx fxsr sse sse2 ss syscall nx rdtscp lm constant_tsc rep_good nopl pni vmx ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm
bogomips : 4800.16
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Duo CPU T7700 @ 2.40GHz
stepping : 11
microcode : 0x1
cpu MHz : 2400.084
cache size : 4096 KB
physical id : 1
siblings : 1
core id : 0
cpu cores : 1
apicid : 1
initial apicid : 1
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 mmx fxsr sse sse2 ss syscall nx rdtscp lm constant_tsc rep_good nopl pni vmx ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm
bogomips : 4800.16
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: