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Pressing J with specific topology crashes blender
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System Information

Blender Version
Broken: 2.72b, from

Short description of error

Attempting to join two vertices with J as shown here causes blender to freeze and memory usage to spike until blender is killed.

Exact steps for others to reproduce the error

  1. Open the blend file from this SE post:
  2. Delete the existing edge between the vertices selected in the above screenshot
  3. With those vertices selected, press J



Event Timeline

Ellwood Zwovic (gandalf3) raised the priority of this task from to Needs Triage by Developer.
Ellwood Zwovic (gandalf3) updated the task description. (Show Details)
Ellwood Zwovic (gandalf3) set Type to Bug.

@Campbell Barton (campbellbarton), if following the method two in my answer here, J also crashes blender with the lastest build after the commit. Would you please confirm this, too?

@Leon Cheung (leon_cheung), please make a new bug report with steps & blend file. (or reference this reports blend is fine too)