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0e1f616
(Get the code!)
I had the same issues this bug describes: Freeze on low load; Runs fine on heavy load. I even ran stress -c 16 when I had to keep the system up for long periods of low load.
I tried pretty much everything in this list including compiling a mainline kernel with CONFIG_RCU_NOCB_CPU enabled and the respective GRUB changes without success.
I noticed a problem in /var/log/syslog involving the ath9k driver.
I disabled the driver (rmmod ath9k) and the problems went away.
I had a PCIe wireless card I swapped in from an earlier Intel Core i5 build that used that driver. After disabling ath9k, all MY problems went away. I replaced it with a different PCIe wireless adapter that has an Intel chipset and my system has been stable ever since. I changed back all the settings that I had altered (except C6) and everything works.
The old Ath9k PCIe card is stable in the Intel system I moved it back to.
I'm only posting here because my bug had the exact symptoms as the ones in this thread but a completely different cause/solution.