Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f7690f45aab in malloc_consolidate () from /lib64/libc.so.6
(gdb) bt
#0  0x00007f7690f45aab in malloc_consolidate () from /lib64/libc.so.6
#1  0x00007f7690f465f1 in _int_free () from /lib64/libc.so.6
#2  0x00007f768f8db204 in ?? () from /usr/lib64/libXft.so.2
#3  0x00007f768f8d70a7 in ?? () from /usr/lib64/libXft.so.2
#4  0x00007f768f3761a2 in XCloseDisplay () from /usr/lib64/libX11.so.6
#5  0x00007f768fc2558c in TkpCloseDisplay (dispPtr=0x8ba7a0)
    at /home/sbron/src/tk8.6.3/unix/../unix/tkUnixEvent.c:224
#6  0x00007f768fb5c6b3 in TkCloseDisplay (dispPtr=0x8ba7a0)
    at /home/sbron/src/tk8.6.3/unix/../generic/tkWindow.c:305
#7  0x00007f768fb5fdb8 in DeleteWindowsExitProc (clientData=0x86ae40)
    at /home/sbron/src/tk8.6.3/unix/../generic/tkWindow.c:2839
#8  0x00007f768fb353a4 in TkFinalizeThread (clientData=0x0)
    at /home/sbron/src/tk8.6.3/unix/../generic/tkEvent.c:2104
#9  0x00007f7691cce336 in Tcl_FinalizeThread ()
    at /home/sbron/src/tcl8.6.3/generic/tclEvent.c:1294
#10 0x00007f7691cce126 in Tcl_Exit (status=0)
    at /home/sbron/src/tcl8.6.3/generic/tclEvent.c:986
#11 0x00007f7691c0fb18 in Tcl_ExitObjCmd (dummy=0x0, interp=0x7bfde0, objc=2, 
    objv=0x7ce078) at /home/sbron/src/tcl8.6.3/generic/tclCmdAH.c:833
#12 0x00007f7691bfecfc in Dispatch (data=0x19b1718, interp=0x7bfde0, result=0)
    at /home/sbron/src/tcl8.6.3/generic/tclBasic.c:4359
#13 0x00007f7691bfed8a in TclNRRunCallbacks (interp=0x7bfde0, result=0, 
    rootPtr=0x91e130) at /home/sbron/src/tcl8.6.3/generic/tclBasic.c:4392
#14 0x00007f7691bfe4ea in Tcl_EvalObjv (interp=0x7bfde0, objc=1, 
    objv=0x7cdb00, flags=2097168)
    at /home/sbron/src/tcl8.6.3/generic/tclBasic.c:4123
#15 0x00007f7691c00c89 in TclEvalEx (interp=0x7bfde0, 
    script=0x150c0e8 "hvexit", numBytes=6, flags=131072, line=1, 
    clNextOuter=0x0, outerScript=0x150c0e8 "hvexit")
    at /home/sbron/src/tcl8.6.3/generic/tclBasic.c:5261
#16 0x00007f7691c00031 in Tcl_EvalEx (interp=0x7bfde0, 
    script=0x150c0e8 "hvexit", numBytes=-1, flags=131072)
    at /home/sbron/src/tcl8.6.3/generic/tclBasic.c:4926
#17 0x00007f768fc401b4 in TkWmProtocolEventProc (winPtr=0xb98240, 
    eventPtr=0x22b0ad0) at /home/sbron/src/tk8.6.3/unix/../unix/tkUnixWm.c:6278
#18 0x00007f768fb346f9 in Tk_HandleEvent (eventPtr=0x22b0ad0)
    at /home/sbron/src/tk8.6.3/unix/../generic/tkEvent.c:1331
#19 0x00007f768fb34db5 in WindowEventProc (evPtr=0x22b0ac0, flags=-3)
    at /home/sbron/src/tk8.6.3/unix/../generic/tkEvent.c:1753
#20 0x00007f7691d27262 in Tcl_ServiceEvent (flags=-3)
    at /home/sbron/src/tcl8.6.3/generic/tclNotify.c:670
#21 0x00007f7691d2755a in Tcl_DoOneEvent (flags=-3)
    at /home/sbron/src/tcl8.6.3/generic/tclNotify.c:903
#22 0x00007f7691cce454 in Tcl_VwaitObjCmd (clientData=0x0, interp=0x7bfde0, 
    objc=2, objv=0x7cd6e0) at /home/sbron/src/tcl8.6.3/generic/tclEvent.c:1405
#23 0x00007f7691bfecfc in Dispatch (data=0xcd19f8, interp=0x7bfde0, result=0)
    at /home/sbron/src/tcl8.6.3/generic/tclBasic.c:4359
#24 0x00007f7691bfed8a in TclNRRunCallbacks (interp=0x7bfde0, result=0, 
    rootPtr=0x0) at /home/sbron/src/tcl8.6.3/generic/tclBasic.c:4392
#25 0x00007f7691bfe4ea in Tcl_EvalObjv (interp=0x7bfde0, objc=2, 
    objv=0x7cd6e0, flags=2097168)
    at /home/sbron/src/tcl8.6.3/generic/tclBasic.c:4123
#26 0x00007f7691c00c89 in TclEvalEx (interp=0x7bfde0, 
    script=0x843050 "#!/usr/bin/tclkit8.6\n# -*- tcl -*-\n\nset dir [file dirname [file join [pwd] [info script]]]\nsource [file join $dir version]\n\n# Find a reasonable temp directory\nforeach n {TMPDIR TEMP TMP} {\n\tif {[info "..., 
    numBytes=23985, flags=0, line=1108, clNextOuter=0x0, 
    outerScript=0x843050 "#!/usr/bin/tclkit8.6\n# -*- tcl -*-\n\nset dir [file dirname [file join [pwd] [info script]]]\nsource [file join $dir version]\n\n# Find a reasonable temp directory\nforeach n {TMPDIR TEMP TMP} {\n\tif {[info "...) at /home/sbron/src/tcl8.6.3/generic/tclBasic.c:5261
#27 0x00007f7691d159df in Tcl_FSEvalFileEx (interp=0x7bfde0, pathPtr=0x7fb1e0, 
    encodingName=0x0) at /home/sbron/src/tcl8.6.3/generic/tclIOUtil.c:1815
#28 0x00007f7691d1fa05 in Tcl_MainEx (argc=-1, argv=0x7fff05e93998, 
    appInitProc=0x400a16 <Tcl_AppInit>, interp=0x7bfde0)
    at /home/sbron/src/tcl8.6.3/generic/tclMain.c:417
#29 0x0000000000400a0f in main (argc=2, argv=0x7fff05e93988)
    at /home/sbron/src/tcl8.6.3/unix/tclAppInit.c:84