Mironenkov: Your freeze is different from Arie's; Arie's failure looks SATA 
related and only then does he see RCU messages, your failure complaining of RCU 
stalls without any apparent cause.
Mironenkov: Please file a separate bug, and state the rcu message in the title.


Arie: Can you please run:

apport-collect 855684     to collect logs for this bug, it'll include
information about your hardware.

Please also use the disk utility on the install CD or smartctl -a to do
a smart check of your drives; that error looks like a timeout of some
form (not necessarily a bad/failing drive).

Dave


** Summary changed:

- The machine locks up hard on heavy load
+ The machine locks up hard on heavy load [SATA errors]

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https://bugs.launchpad.net/bugs/855684

Title:
  The machine locks up hard on heavy load [SATA errors]

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