better stacktrace

#0  0xb7d5ada3 in strlen () from /lib/libc.so.6
#1  0xb76beb2b in Tcl_ScanCountedElement (string=<value optimized out>, length=16, flagPtr=0xb7215b4c) at /home/manveru/pkgbuilds/tcl/src/tcl8.5.8/unix/../generic/tclUtil.c:710
#2  0xb76bec8c in Tcl_ScanElement (string=0x10 <Address 0x10 out of bounds>, flagPtr=0xb7215b4c) at /home/manveru/pkgbuilds/tcl/src/tcl8.5.8/unix/../generic/tclUtil.c:627
#3  0xb76aa941 in Tcl_AppendElement (interp=0x8487678, element=0x10 <Address 0x10 out of bounds>) at /home/manveru/pkgbuilds/tcl/src/tcl8.5.8/unix/../generic/tclResult.c:722
#4  0xb757a148 in DumpSegment (textPtr=<value optimized out>, interp=<value optimized out>, key=0xb75dbe28 "mark", value=0x10 <Address 0x10 out of bounds>, command=0x0, index=0xb7215c60, what=31)
    at /home/manveru/pkgbuilds/tk/src/tk8.5.8/unix/../generic/tkText.c:4830
#5  0xb757a571 in DumpLine (interp=<value optimized out>, textPtr=<value optimized out>, what=31, linePtr=0x89eea20, startByte=0, endByte=32000000, lineno=10, command=0x0)
    at /home/manveru/pkgbuilds/tk/src/tk8.5.8/unix/../generic/tkText.c:4738
#6  0xb757cfbd in TextDumpCmd (clientData=0x8bdfb48, interp=0x8487678, objc=<value optimized out>, objv=0x8cb6248) at /home/manveru/pkgbuilds/tk/src/tk8.5.8/unix/../generic/tkText.c:4559
#7  TextWidgetObjCmd (clientData=0x8bdfb48, interp=0x8487678, objc=<value optimized out>, objv=0x8cb6248) at /home/manveru/pkgbuilds/tk/src/tk8.5.8/unix/../generic/tkText.c:1229
#8  0xb76143d9 in TclEvalObjvInternal (interp=0x8487678, objc=5, objv=0x8cb6248, command=0x912f8e0 "\".frame0.toplevel0.frame1.text3\" \"dump\" -all \"1.0\" \"end\"", length=56, flags=0)
    at /home/manveru/pkgbuilds/tcl/src/tcl8.5.8/unix/../generic/tclBasic.c:3689
#9  0xb7614a56 in TclEvalEx (interp=0x8487678, script=0x912f8e0 "\".frame0.toplevel0.frame1.text3\" \"dump\" -all \"1.0\" \"end\"", numBytes=56, flags=262144, line=1, clNextOuter=0x0, 
    outerScript=0x912f8e0 "\".frame0.toplevel0.frame1.text3\" \"dump\" -all \"1.0\" \"end\"") at /home/manveru/pkgbuilds/tcl/src/tcl8.5.8/unix/../generic/tclBasic.c:4386
#10 0xb76150ba in Tcl_EvalEx (interp=0x8487678, script=0x912f8e0 "\".frame0.toplevel0.frame1.text3\" \"dump\" -all \"1.0\" \"end\"", numBytes=56, flags=262144)
    at /home/manveru/pkgbuilds/tcl/src/tcl8.5.8/unix/../generic/tclBasic.c:4043