Description of problem:

gnome-shell was killed by SIGABRT in freetype lib.

Backtrace below indicates that it aborted at gray_find_cell().

  {   "signal": 6
  ,   "executable": "/usr/bin/gnome-shell"
  ,   "stacktrace":
        [ {   "crash_thread": true
          ,   "frames":
                [ {   "address": 140275056607703
                  ,   "build_id": "4ec510505f71aeacdf5a4035bec5b39afbb65538"
                  ,   "build_id_offset": 217559
                  ,   "function_name": "raise"
                  ,   "file_name": "/lib64/libc.so.6"
                  }
                , {   "address": 140275056613576
                  ,   "build_id": "4ec510505f71aeacdf5a4035bec5b39afbb65538"
                  ,   "build_id_offset": 223432
                  ,   "function_name": "abort"
                  ,   "file_name": "/lib64/libc.so.6"
                  }
                , {   "address": 140275056869127
                  ,   "build_id": "4ec510505f71aeacdf5a4035bec5b39afbb65538"
                  ,   "build_id_offset": 478983
                  ,   "function_name": "__libc_message"
                  ,   "file_name": "/lib64/libc.so.6"
                  }
                , {   "address": 140275057500231
                  ,   "build_id": "4ec510505f71aeacdf5a4035bec5b39afbb65538"
                  ,   "build_id_offset": 1110087
                  ,   "function_name": "__fortify_fail"
                  ,   "file_name": "/lib64/libc.so.6"
                  }
                , {   "address": 140275057500013
                  ,   "build_id": "4ec510505f71aeacdf5a4035bec5b39afbb65538"
                  ,   "build_id_offset": 1109869
                  ,   "function_name": "____longjmp_chk"
                  ,   "file_name": "/lib64/libc.so.6"
                  }
                , {   "address": 140275057499849
                  ,   "build_id": "4ec510505f71aeacdf5a4035bec5b39afbb65538"
                  ,   "build_id_offset": 1109705
                  ,   "function_name": "__longjmp_chk"
                  ,   "file_name": "/lib64/libc.so.6"
                  }
                , {   "address": 140274942676126
                  ,   "build_id": "960cd6657a06ba484bfb434a7b398d27a2634244"
                  ,   "build_id_offset": 380062
                  ,   "file_name": "/lib64/libfreetype.so.6"
                  }
                , {   "address": 140274942676266
                  ,   "build_id": "960cd6657a06ba484bfb434a7b398d27a2634244"
                  ,   "build_id_offset": 380202
                  ,   "function_name": "gray_set_cell"
                  ,   "file_name": "/lib64/libfreetype.so.6"
                  }
                , {   "address": 140274942677166
                  ,   "build_id": "960cd6657a06ba484bfb434a7b398d27a2634244"
                  ,   "build_id_offset": 381102
                  ,   "function_name": "gray_render_line"
                  ,   "file_name": "/lib64/libfreetype.so.6"
                  }
                , {   "address": 140274942679197
                  ,   "build_id": "960cd6657a06ba484bfb434a7b398d27a2634244"
                  ,   "build_id_offset": 383133
                  ,   "function_name": "gray_conic_to"
                  ,   "file_name": "/lib64/libfreetype.so.6"
                  }
                , {   "address": 140274942374630
                  ,   "build_id": "960cd6657a06ba484bfb434a7b398d27a2634244"
                  ,   "build_id_offset": 78566
                  ,   "function_name": "FT_Outline_Decompose"
                  ,   "file_name": "/lib64/libfreetype.so.6"
  (..snip..)



Version-Release number of selected component (if applicable):

- gnome-shell-3.14.4-53.el7
- gnome-session-3.14.0-5.el7.x86_64
- gdm-3.14.2-19.el7.x86_64
- glib2-2.46.2-4.el7.x86_64
- freetype-2.4.11-12.el7.x86_64

How reproducible:

- Sometimes

Steps to Reproduce:

- I cannot find the reproducer.


Expected results:

- It doesn't occur.

Additional info:

- I found similar issues:

  https://bugzilla.redhat.com/show_bug.cgi?id=956269