Operating system and graphics card
Kubuntu 14.10 64bits
Broken: (hash 2cacb22 - march 3 buildbot)
Worked: (Feb 27 buildbot)
The problem seems only so occur in the Gooseberry Branch.
If you press the "apply" button in any modifier of the Deform or Modify category, Blender crashes. Note that modifiers such as Armature and Mesh Deform, must have their target assigned in order to crash.
Just add a Cube and assign a smooth modifier, press apply and it crashes. Apply as shape seems to be working fine though.