I forgot to say that I tried different kernels: 3.2, 3.4 and 3.7. The
kernel panic bug (from this thread:
http://ubuntuforums.org/showthread.php?p=12430893#post12430893):

Bug with 3.2, ffmpeg and one core deactivated:
[    7.250095] SP5100 TCO timer: mmio address 0xbafe00 already in use
[   23.216775] SP5100 TCO timer: mmio address 0xbafe00 already in use
[   21.184130] SP5100 TCO timer: mmio address 0xbafe00 already in use
[ 1583.874892] [Hardware Error]: CPU 0: Machine Check Exception: 4 Bank 0: 
b600000000010015
[ 1583.876014] [Hardware Error]: TSC 252f65ae0c8 ADDR b671d000 
[ 1583.876014] [Hardware Error]: PROCESSOR 2:500f10 TIME 1356285230 SOCKET 0 
APIC 0 microcode 5000028
[ 1583.876014] [Hardware Error]: Run the above through 'mcelog --ascii'
[ 1583.876014] [Hardware Error]: Machine check: Processor context corrupt
[ 1583.876014] Kernel panic - not syncing: Fatal machine check on current CPU
[ 1583.876014] Pid: 3234, comm: ffmpeg Tainted: G   M       O 3.2.0-35-generic 
#55-Ubuntu
[ 1583.876014] Call Trace:
[ 1583.876014]  [<c1560f2c>] ? printk+0x2d/0x2f
[ 1583.876014]  [<c1560dfa>] panic+0x5c/0x161
[ 1583.876014]  [<c1015a0f>] mce_panic.part.14+0x13f/0x170
[ 1583.876014]  [<c1015a92>] mce_panic+0x52/0x90
[ 1583.876014]  [<c1016526>] do_machine_check+0x356/0x4f0
[ 1583.876014]  [<c10161d0>] ? mce_log+0x120/0x120
[ 1583.876014]  [<c15769a7>] error_code+0x67/0x6c
[   24.773952] SP5100 TCO timer: mmio address 0xbafe00 already in use
[   24.118978] SP5100 TCO timer: mmio address 0xbafe00 already in use

Bug with 3.7
[  765.772789] i2c /dev entries driver
[ 1327.785334] mce: [Hardware Error]: CPU 1: Machine Check Exception: 4 Bank 0: 
f600000000010015
[ 1327.789344] mce: [Hardware Error]: TSC 1f357ac28c4 ADDR b1be8000 
[ 1327.793361] mce: [Hardware Error]: PROCESSOR 2:500f10 TIME 1356277176 SOCKET 
0 APIC 1 microcode 5000026
[ 1327.797362] mce: [Hardware Error]: Run the above through 'mcelog --ascii'
[ 1327.801339] mce: [Hardware Error]: Machine check: Invalid
[ 1327.805255] Kernel panic - not syncing: Fatal machine check on current CPU

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https://bugs.launchpad.net/bugs/1094904

Title:
  irq 16: nobody cared usb_hcd_irq

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