I managed to get core file and I attached the output of gdb fvwm2 core and where below. It seems something related to ewmh. Any help would be very appreciated. ingo
GNU gdb 6.6-debian Copyright (C) 2006 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "x86_64-linux-gnu"... Using host libthread_db library "/lib/libthread_db.so.1". Reading symbols from /usr/lib/libXft.so.2...done. Loaded symbols for /usr/lib/libXft.so.2 Reading symbols from /usr/lib/libX11.so.6...done. Loaded symbols for /usr/lib/libX11.so.6 Reading symbols from /usr/lib/libfreetype.so.6...done. Loaded symbols for /usr/lib/libfreetype.so.6 Reading symbols from /usr/lib/libz.so.1...done. Loaded symbols for /usr/lib/libz.so.1 Reading symbols from /usr/lib/libfontconfig.so.1...done. Loaded symbols for /usr/lib/libfontconfig.so.1 Reading symbols from /usr/lib/libXrender.so.1...done. Loaded symbols for /usr/lib/libXrender.so.1 Reading symbols from /usr/lib/libXpm.so.4...done. Loaded symbols for /usr/lib/libXpm.so.4 Reading symbols from /usr/lib/libstroke.so.0...done. Loaded symbols for /usr/lib/libstroke.so.0 Reading symbols from /usr/lib/libSM.so.6...done. Loaded symbols for /usr/lib/libSM.so.6 Reading symbols from /usr/lib/libICE.so.6...done. Loaded symbols for /usr/lib/libICE.so.6 Reading symbols from /usr/lib/libXinerama.so.1...done. Loaded symbols for /usr/lib/libXinerama.so.1 Reading symbols from /usr/lib/libXext.so.6...done. Loaded symbols for /usr/lib/libXext.so.6 Reading symbols from /lib/libm.so.6...done. Loaded symbols for /lib/libm.so.6 Reading symbols from /usr/lib/libXcursor.so.1...done. Loaded symbols for /usr/lib/libXcursor.so.1 Reading symbols from /usr/lib/libfribidi.so.0...done. Loaded symbols for /usr/lib/libfribidi.so.0 Reading symbols from /usr/lib/libpng12.so.0...done. Loaded symbols for /usr/lib/libpng12.so.0 Reading symbols from /usr/lib/librsvg-2.so.2...done. Loaded symbols for /usr/lib/librsvg-2.so.2 Reading symbols from /usr/lib/libgdk_pixbuf-2.0.so.0...Reading symbols from /usr/lib/debug/usr/lib/libgdk_pixbuf-2.0.so.0.1000.11...done. done. Loaded symbols for /usr/lib/libgdk_pixbuf-2.0.so.0 Reading symbols from /usr/lib/libgobject-2.0.so.0...Reading symbols from /usr/lib/debug/usr/lib/libgobject-2.0.so.0.1200.11...done. done. Loaded symbols for /usr/lib/libgobject-2.0.so.0 Reading symbols from /usr/lib/libgmodule-2.0.so.0...Reading symbols from /usr/lib/debug/usr/lib/libgmodule-2.0.so.0.1200.11...done. done. Loaded symbols for /usr/lib/libgmodule-2.0.so.0 Reading symbols from /lib/libdl.so.2...done. Loaded symbols for /lib/libdl.so.2 Reading symbols from /usr/lib/libglib-2.0.so.0...Reading symbols from /usr/lib/debug/usr/lib/libglib-2.0.so.0.1200.11...done. done. Loaded symbols for /usr/lib/libglib-2.0.so.0 Reading symbols from /usr/lib/libcairo.so.2...done. Loaded symbols for /usr/lib/libcairo.so.2 Reading symbols from /lib/libc.so.6...done. Loaded symbols for /lib/libc.so.6 Reading symbols from /usr/lib/libXau.so.6...done. Loaded symbols for /usr/lib/libXau.so.6 Reading symbols from /usr/lib/libXdmcp.so.6...done. Loaded symbols for /usr/lib/libXdmcp.so.6 Reading symbols from /usr/lib/libexpat.so.1...done. Loaded symbols for /usr/lib/libexpat.so.1 Reading symbols from /usr/lib/libXfixes.so.3...done. Loaded symbols for /usr/lib/libXfixes.so.3 Reading symbols from /usr/lib/libgsf-1.so.114...done. Loaded symbols for /usr/lib/libgsf-1.so.114 Reading symbols from /usr/lib/libcroco-0.6.so.3...done. Loaded symbols for /usr/lib/libcroco-0.6.so.3 Reading symbols from /usr/lib/libxml2.so.2...done. Loaded symbols for /usr/lib/libxml2.so.2 Reading symbols from /usr/lib/libpangoft2-1.0.so.0...done. Loaded symbols for /usr/lib/libpangoft2-1.0.so.0 Reading symbols from /usr/lib/libpangocairo-1.0.so.0...done. Loaded symbols for /usr/lib/libpangocairo-1.0.so.0 Reading symbols from /usr/lib/libpango-1.0.so.0...done. Loaded symbols for /usr/lib/libpango-1.0.so.0 Reading symbols from /lib/ld-linux-x86-64.so.2...done. Loaded symbols for /lib64/ld-linux-x86-64.so.2 Reading symbols from /lib/libpthread.so.0...done. Loaded symbols for /lib/libpthread.so.0 Reading symbols from /lib/libbz2.so.1.0...done. Loaded symbols for /lib/libbz2.so.1.0 Reading symbols from /usr/lib/gconv/ISO8859-1.so...done. Loaded symbols for /usr/lib/gconv/ISO8859-1.so Core was generated by `fvwm2'. Program terminated with signal 11, Segmentation fault. #0 ewmh_MoveResizeWindow (fw=0x0, ev=0x6cb9e0, style=0x0, any=0) at ewmh_events.c:194 194 if ( (gdb) where #0 ewmh_MoveResizeWindow (fw=0x0, ev=0x6cb9e0, style=0x0, any=0) at ewmh_events.c:194 #1 0x0000000000466f4f in EWMH_ProcessClientMessage ( exc=<value optimized out>) at ewmh_events.c:1485 #2 0x000000000042c43f in HandleClientMessage (ea=0x7fff275af0d0) at events.c:1796 #3 0x0000000000428f33 in dispatch_event (e=0x7fff275af100) at events.c:3948 #4 0x000000000042965a in HandleEvents () at events.c:3989 #5 0x000000000044a02a in main (argc=<value optimized out>, argv=<value optimized out>) at fvwm.c:2603 (gdb)