System Info Attached
Broken: 2.77a, 2.78a
Three crash reports attached.
Saving the file without changing the name causes a segfault - this is repeatable on my system with the attached .blend most of the time, however it does not occur with other files (for example I can save over the startup file without issue)
I have older versions of this file which do not seem to cause the issue, however after reverting to one and working for a while the issue seems to reappear.
The mesh and armature are created with ManuelBastioniLab.
Exact steps for others to reproduce the error
Attempt to save the .blend without changing the name.