that one happened with the keyed physics type... weird, i cant quite reproduce it

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 47384740702592 (LWP 15401)]
0x00000000009e6142 in psys_cache_paths (ob=0x1aff0b0, psys=0x173b7a0, cfra=0)
    at source/blender/blenkernel/intern/particle.c:1840
1840    source/blender/blenkernel/intern/particle.c: No such file or directory.
        in source/blender/blenkernel/intern/particle.c
(gdb) where
#0  0x00000000009e6142 in psys_cache_paths (ob=0x1aff0b0, psys=0x173b7a0, 
    cfra=0) at source/blender/blenkernel/intern/particle.c:1840
#1  0x0000000000a88c45 in psys_update_path_cache (ob=0x1aff0b0, 
    psmd=0x173b950, psys=0x173b7a0, cfra=0)
    at source/blender/blenkernel/intern/particle_system.c:3850
#2  0x0000000000a89a5a in system_step (ob=0x1aff0b0, psys=0x173b7a0, 
    psmd=0x173b950, cfra=0)
    at source/blender/blenkernel/intern/particle_system.c:4105
#3  0x0000000000a89da6 in particle_system_update (ob=0x1aff0b0, psys=0x173b7a0)
    at source/blender/blenkernel/intern/particle_system.c:4208
#4  0x00000000009b71e8 in particleSystemModifier_deformVerts (md=0x173b950, 
    ob=0x1aff0b0, derivedData=0x0, vertexCos=0x17f0030, numVerts=4)
    at source/blender/blenkernel/intern/modifier.c:5099
#5  0x0000000000a1c8b1 in mesh_calc_modifiers (ob=0x1aff0b0, 
    inputVertexCos=0x0, deform_r=0x1aff4b0, final_r=0x1aff4b8, 
    useRenderParams=0, useDeform=1, needMapping=0, dataMask=153)
    at source/blender/blenkernel/intern/DerivedMesh.c:1889
#6  0x0000000000a1da65 in mesh_build_data (ob=0x1aff0b0, dataMask=25)
    at source/blender/blenkernel/intern/DerivedMesh.c:2365
#7  0x0000000000a1dd07 in makeDerivedMesh (ob=0x1aff0b0, dataMask=25)
    at source/blender/blenkernel/intern/DerivedMesh.c:2423
#8  0x00000000009a9689 in object_handle_update (ob=0x1aff0b0)
    at source/blender/blenkernel/intern/object.c:2135
---Type <return> to continue, or q <return> to quit---
#9  0x0000000000613cb5 in drawview3dspace (sa=0x150ff60, spacedata=0x1510310)
    at source/blender/src/drawview.c:2783
#10 0x0000000000778c6e in scrarea_do_windraw (area=0x150ff60)
    at source/blender/src/spacetypes.c:128
#11 0x000000000052d8cf in scrarea_dispatch_events (sa=0x150ff60)
    at source/blender/src/editscreen.c:614
#12 0x000000000052f2d4 in screen_dispatch_events ()
    at source/blender/src/editscreen.c:1231
#13 0x000000000052fd3f in screenmain () at source/blender/src/editscreen.c:1510
#14 0x000000000052c4f5 in main (argc=1, argv=0x7fff1162aff8)
    at source/creator/creator.c:707


trying to scale in particle edit mode:

#0  0x00000000007489b2 in ElementResize (t=0x10a8e40, td=0x2c0d84a0, 
    mat=0x7fffe7d32f80) at source/blender/src/transform.c:1736
#1  0x0000000000748edb in Resize (t=0x10a8e40, mval=0x7fffe7d330c0)
    at source/blender/src/transform.c:1817
#2  0x0000000000746261 in Transform () at source/blender/src/transform.c:1046
#3  0x00000000006d57d0 in winqreadview3dspace (sa=0x40f3090, 
    spacedata=0x1852530, evt=0x7fffe7d33250) at source/blender/src/space.c:2380
#4  0x0000000000778e0c in scrarea_do_winhandle (area=0x40f3090, 
    evt=0x7fffe7d33250) at source/blender/src/spacetypes.c:159
#5  0x000000000052d828 in scrarea_dispatch_events (sa=0x40f3090)
    at source/blender/src/editscreen.c:599
#6  0x000000000052f2d4 in screen_dispatch_events ()
    at source/blender/src/editscreen.c:1231
#7  0x000000000052fd3f in screenmain () at source/blender/src/editscreen.c:1510
#8  0x000000000052c4f5 in main (argc=1, argv=0x7fffe7d33708)
    at source/creator/creator.c:707