Comment 8 for bug 754711

Do you get any kind of panic message or anything else when the system freezes after you increase vmalloc? Try running pm-suspend from within vt1 to see if anything shows up on the screen. You might also try using magic sysrq when it's frozen, try alt-sysrq-p to get a dump of the current task's state.

The freeze may well be a different problem.