I has video card NVIDIA® GeForce® 8600GT installed. After upgrading of an operating system from version 11.1-RELEASE to version 11.2-RELEASE and updating of all installed packages I have faced a problem. When Xorg starting there is an kernel panic in 100% of cases. Also i has the laptop with video card NVIDIA 240M installed. After upgrading of an system to version 11.2-RELEASE on the laptop there was a similar problem. When xorg starts this process utilizes 100% of resources of the CPU. At this time the Xorg doesn't loading. Process without reset it is impossible to kill.
gzipped core dump: https://goo.gl/ahYRp2
*** This bug has been marked as a duplicate of bug 228536 ***