SIGSEGV in faces customisation 21.2-b15 "Sakuragawa"

Installation is attached. With debug-on-error and debug-on-signal set t, attempts to access either of the menu items Options > Customize > Face... or Options > Edit Faces... followed by the selection of the default `all' results in the generation of the customise buffer, and the message Creating customization buffer... done at which point stillness descends. I can go away for a cup of tea, and when I move the mouse, xemacs dumps core - no backtrace. The core is no more helpful. When I run gdb -c core xemacs-beta I am informed that the program terminated with a SEGV. `where' gives me #0 0x0 in ?? () I know nothing about gdb, as may be obvious, but I was under the impression that `where' would tell me something about, well, where. Is there any way I can extract more information about this thing? xemacs-beta is a link to src/xemacs, as compiled on June 9, from a cvs update of a day or two before. (I have since done another update without a compile, so I can't say just when.) Yours faithfully, -- __ /__ Peter B. West p.west(a)uq.net.au / http://www.uq.net.au/~zzpwest / "Lord, to whom shall we go?" uname -a: Linux zzpwest.dialin.uq.net.au 2.2.5-15 #4 Thu May 27 22:38:41 EST 1999 i586 unknown ./configure '--cflags=-g -O3 -DENABLE_COMPOSITE_CHARS' '--with-mule' '--with-png=yes' '--debug' '--memory-usage-stats' '--rel-alloc' XEmacs 21.2-b15 "Sakuragawa" configured for `i586-pc-linux'. Where should the build process find the source code? /opt3/src/xemacs/xemacs-21.2 What installation prefix should install use? /usr/local What operating system and machine description files should XEmacs use? `s/linux.h' and `m/intel386.h' What compiler should XEmacs be built with? gcc -g -O3 -DENABLE_COMPOSITE_CHARS Should XEmacs use the GNU version of malloc? yes (Using Doug Lea's new malloc from the GNU C Library.) Should XEmacs use the relocating allocator for buffers? yes What window system should XEmacs use? x11 Where do we find X Windows header files? /usr/X11/include Where do we find X Windows libraries? /usr/X11/lib Compiling in support for XAUTH. Compiling in support for XPM images. Compiling in support for PNG image handling. Compiling in support for (builtin) GIF image handling. Compiling in support for JPEG image handling. Compiling in support for TIFF image handling. Compiling in support for X-Face message headers. Compiling in native sound support. Compiling in support for Berkeley DB. Compiling in support for GNU DBM. Compiling in support for ncurses. Compiling in support for GPM (General Purpose Mouse). Compiling in Mule (multi-lingual) support. Compiling in XIM (X11R5+ I18N input method) support. Using raw Xlib to provide XIM support. Compiling in support for proper WM_COMMAND handling. Using Lucid menubars. Using Lucid scrollbars. Using Motif dialog boxes. Compiling in DLL support. movemail will use "dot-locking" for locking mail spool files. Compiling in extra code for debugging. WARNING: --------------------------------------------------------- WARNING: Compiling in support for runtime error checking. WARNING: XEmacs will run noticeably more slowly as a result. WARNING: Error checking is on by default for XEmacs beta releases. WARNING: ---------------------------------------------------------