I'll just post a kernel changelog of the current CM11 Build;
- Added timer slack controller
- Added dynamic fsync
- Added proportional rate reduction for TCP
- Added opensource camera driver (mt9p012)
- Added syspanic driver for panic_daemon
- Added sync framework (together with ION its part of androids graphical "project butter")
- Switched to SLUB allocator
- Enabled ram console Support
- Synced binder to mainline version (~3.10)
- Fixed reboot while incoming or outcoming call (fix proximity sensor in general)
- Many small performance patches and fixes for better android support all over the place
RAM console is a pretty big change, it allows much better debugging. So whenever you encounter any random reboot,
boot into android and run
cat /proc/last_kmsg. This will give you a dmesg-output which contains your crash