I can reproduce this core in both 21.2.38 and 21.2.39. Pretty simple to reproduce on my system: C-x C-c :-( This is RedHat 6.2+OpenMotif+XFree86 4.0.1... #0 0x40499d21 in __kill () from /lib/libc.so.6 #1 0x80be43e in fatal_error_signal (sig=11) at emacs.c:535 #2 <signal handler called> #3 0x40280335 in XtIsSubclass () from /usr/X11R6/lib/libXt.so.6 #4 0x4028109a in XtDisplayOfObject () from /usr/X11R6/lib/libXt.so.6 #5 0x40128694 in unset_current_xic () from /usr/local/lib/libXm.so.2 #6 0x40125ea3 in _XmImFreeShellData () from /usr/local/lib/libXm.so.2 #7 0x4012e0c3 in Destroy () from /usr/local/lib/libXm.so.2 #8 0x40276fb1 in Phase2Destroy () from /usr/X11R6/lib/libXt.so.6 #9 0x40276e17 in Recursive () from /usr/X11R6/lib/libXt.so.6 #10 0x402772df in XtPhase2Destroy () from /usr/X11R6/lib/libXt.so.6 #11 0x402773d0 in _XtDoPhase2Destroy () from /usr/X11R6/lib/libXt.so.6 #12 0x40277556 in XtDestroyWidget () from /usr/X11R6/lib/libXt.so.6 #13 0x81eee64 in x_delete_frame (f=0x85d8c18) at frame-x.c:2685 #14 0x813ef87 in delete_frame_internal (f=0x85d8c18, force=1, called_from_delete_device=1, from_io_error=0) at frame.c:1533 #15 0x80ae563 in delete_device_internal (d=0x8631cb0, force=1, called_from_delete_console=1, from_io_error=0) at device.c:790 #16 0x80a6f3b in delete_console_internal (con=0x8631918, force=1, called_from_kill_emacs=1, from_io_error=0) at console.c:684 #17 0x80bcff8 in Fkill_emacs (arg=137284412) at emacs.c:2757 #18 0x80c33f4 in Ffuncall (nargs=1, args=0xbffff2c4) at eval.c:3528 #19 0x8096359 in execute_optimized_program ( program=0x881c658 "Ä\bÅ\"\210ÅÆÇÈ \"s«\006ÉÊ!­?ËÌ!«3Ì Í\032\211\e« Î\013＠!Ïs«\022Ð\013＠!\031Ð\013＠\t\"\210\t)«\003Å\022\013A\211\023¬â\n?®\005\212Ñ\213)*­\bÒÓ!­\003Ô \207", stack_depth=5, constants_data=0x84c5258) at bytecode.c:746 #20 0x8095f9b in funcall_compiled_function (fun=139217460, nargs=1, args=0xbffff3d4) at bytecode.c:518 #21 0x80c356f in Ffuncall (nargs=2, args=0xbffff3d0) at eval.c:3563 #22 0x809badc in Fcall_interactively (function=137382924, record_flag=137284412, keys=137284412) at callint.c:940 #23 0x80c1f26 in Fcommand_execute (cmd=137382924, record_flag=137284412, keys=137284412) at eval.c:2970 #24 0x8111f6a in execute_command_event (command_builder=0x8631988, event=141457148) at event-stream.c:3833 #25 0x8112a4c in Fdispatch_event (event=141457148) at event-stream.c:4116 #26 0x80a4beb in Fcommand_loop_1 () at cmdloop.c:583 #27 0x80a4e20 in command_loop_1 (dummy=137284412) at cmdloop.c:494 #28 0x80c7c7a in condition_case_1 (handlers=137284508, bfun=0x80a4de8 <command_loop_1>, barg=137284412, hfun=0x80a4130 <cmd_error>, harg=137284412) at eval.c:1651 #29 0x80a4efc in command_loop_2 (dummy=137284412) at cmdloop.c:256 #30 0x80c7b4f in internal_catch (tag=137360796, func=0x80a4ec8 <command_loop_2>, arg=137284412, threw=0x0) at eval.c:1317 #31 0x80a44da in initial_command_loop (load_me=137284412) at cmdloop.c:305 #32 0x80bc8cd in xemacs_21_2_b39_i686_pc_linux () at emacs.c:2253 #33 0x80be627 in main () at emacs.c:2682 #34 0x404939cb in __libc_start_main (main=0x80be530 <main>, argc=1, argv=0xbffff934, init=0x80827a8 <_init>, fini=0x8229cc8 <_fini>, rtld_fini=0x4000ae60 <_dl_fini>, stack_end=0xbffff92c) at ../sysdeps/generic/libc-start.c:92 uname -a: Linux yitzchak 2.2.14-5.0 #1 Tue Mar 7 21:07:39 EST 2000 i686 unknown ./configure '--extra-verbose' '--site-includes=/usr/include/gdbm' '-debug' '--cache-file=/dev/null' XEmacs 21.2-b39 "Millennium" configured for `i686-pc-linux'. Compilation / Installation: Source code location: /home/ysh/xemacs-21.2.39 Installation prefix: /usr/local Additional header files: /usr/include/gdbm Operating system description file: `s/linux.h' Machine description file: `m/intel386.h' Compiler: gcc -g -O3 -Wall -Wno-switch -Wpointer-arith -Winline -Wmissing-prototypes -Wshadow Relocating allocator for buffers: no GNU version of malloc: yes - Using Doug Lea's new malloc from the GNU C Library. Window System: Compiling in support for the X window system: Compiling in support for the X window system: - X Windows headers location: /usr/X11R6/include - X Windows libraries location: /usr/X11R6/lib - Handling WM_COMMAND properly. Using Lucid menubars. Using Lucid scrollbars. Using Motif dialog boxes. Using Motif native widgets. TTY: Compiling in support for ncurses. Compiling in support for GPM (General Purpose Mouse). Images: Compiling in support for GIF images (builtin). Compiling in support for XPM images. Compiling in support for PNG images. Compiling in support for JPEG images. Compiling in support for TIFF images. Sound: Compiling in support for sound (native). Compiling in support for ESD (Enlightened Sound Daemon). Databases: Compiling in support for Berkeley database. Compiling in support for GNU DBM. Compiling in support for LDAP. Internationalization: Mail: Compiling in support for "dot-locking" mail spool file locking method. Other Features: Compiling in support for dynamic shared object modules. Compiling in support for extra debugging code. 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: ---------------------------------------------------------