**System Information**
Win8.1 64bit | GTX680
**Blender Version**
Broken: 2.72.2 5604a3d
**Short description of error**
When using Join tool (shortcut J) in the attached case, Blender can easily crash or just become slow.
**Exact steps for others to reproduce the error**
Open attached file, switch to Edit mode of either objects in the scene, then Press J.
{F123122}
Thanks for checking.