[Bug 1759] New: XtVaGetValues core dump on x86_64

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https://freedesktop.org/bugzilla/show_bug.cgi?id=1759        
   
           Summary: XtVaGetValues core dump on x86_64
           Product: xorg
           Version: 6.7.0
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: critical
          Priority: P2
         Component: Lib/Xt
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: cjnygard at fast.net


I'm having curious problems with XtVaGetValues (and also by extension
XtVaCreatePopupShell) on x86_64, it keeps core dumping.  Here's a stacktrace:

(gdb) where#0  0x00000037c3f48c43 in _XtCountVaList () from
/usr/X11R6/lib64/libXt.so.6#1  0x00000037c3f48746 in XtVaGetValues () from
/usr/X11R6/lib64/libXt.so.6#2  0x0000000000400dd4 in main (argc=1,
argv=0x7fbffff768) at motifbug.cxx:26
(gdb)

packages come from Fedora Core2:
[mwsadm at fims64 hdfloader]$ rpm -qa "xorg*"
xorg-x11-tools-6.7.0-2
xorg-x11-xauth-6.7.0-2
xorg-x11-75dpi-fonts-6.7.0-2
xorg-x11-Mesa-libGL-6.7.0-2
xorg-x11-font-utils-6.7.0-2
xorg-x11-base-fonts-6.7.0-2
xorg-x11-libs-6.7.0-2
xorg-x11-Mesa-libGL-6.7.0-2
xorg-x11-xfs-6.7.0-2
xorg-x11-6.7.0-2
xorg-x11-libs-data-6.7.0-2
xorg-x11-libs-6.7.0-2
xorg-x11-100dpi-fonts-6.7.0-2
xorg-x11-Mesa-libGLU-6.7.0-2
xorg-x11-twm-6.7.0-2
xorg-x11-devel-6.7.0-2
xorg-x11-Mesa-libGLU-6.7.0-2

Attached is the code to reproduce the bug in a simple pure-X/Motif test code,
compiled via:

g++ -g -o motifbug motifbug.cxx -L /usr/X11R6/lib64 -lXm -lXt

This generates an X warning.  Whatever.  Add -DDUMP to the cmd line and it will
coredump on the XtVaGetValues function.  What gives?  #ifdef'ing a function that
comes *after* the location of the core matters?  I know X is asynchronous but
that seems to indicate a compiler problem???

I don't rule out user error, like improper compiler flags, but the example is
really simple, so I don't see how.        
   
   
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