when added a inverse kinematics to a bone it causes a crash.
windows 7 ultimate x86
processor: amd phenon 9500 quadcore 2.21GH
nvidia geforce 6050SE nforce 430
blender 2.78a hash e8299c8
the bug not is happening in previous versions.
open blender, delete defaut cube and add a single bone, go to edit mode, extrude the bone tree times and duplicate the last bone, unparent it, go to pose mode and add a inferse kinematic constraint setup, uncheck use tail opition, and it will crash blender.
or simply enable auto IK and try editing the pose.
this file crashed blender all times:
console screenshot on exact moment of crash:
sory my bad english.