Yikes!
I'm envious of your time(s), but the size does seem enormous.
Well, I'm giving 3.11-rc1 another shot.
First try didn't last for 30 seconds before hard-locking. I misspelled "enabled" (left the 'd' off the end)
Second try has lasted 15 minutes, so far, after disabling Zswap in the kernel boot parameters.
See what happens...
EDIT
Okay, that's it. Lasted 49 minutes, this time.
I figured out a way to crash 3.11-rc1 every time, on this machine -- goto ->FB and play a Zynga flash game in Firefox. BooM! Repeatable time-after-after. LoL!
Patiently awaiting rc2...