Dunno if this is like the other crashes reported recently.
Latest CVS. I move the mouse around in and out of the xemacs window.
I believe this particular buffer was the About buffer.
I have been unable to reproduce this in -vanilla.
Here's the backtrace.
#0 0x402891a1 in kill () from /lib/libc.so.6
#1 0x80b6a4d in fatal_error_signal (sig=6) at /usr/local/src/xemacs-21.2-2000-03-25/src/emacs.c:293
#2 0x402890c8 in sigaction () from /lib/libc.so.6
#3 0x4028a5d7 in abort () from /lib/libc.so.6
#4 0x80b6994 in assert_failed () at /usr/local/src/xemacs-21.2-2000-03-25/src/emacs.c:2749
#5 0x812cab9 in image_instantiate (specifier=137423088, matchspec=136688652, domain=142456416,
instantiator=141648280, depth=3) at /usr/local/src/xemacs-21.2-2000-03-25/src/glyphs.c:2917
#6 0x80b97f1 in call_with_suspended_errors_1 (opaque_arg=139029616)
at /usr/local/src/xemacs-21.2-2000-03-25/src/eval.c:2108
#7 0x80b8853 in internal_catch (tag=137383368, func=0x80b96c0 <call_with_suspended_errors_1>,
arg=139029616, threw=0xbffff484) at /usr/local/src/xemacs-21.2-2000-03-25/src/eval.c:1309
#8 0x80b9ad2 in call_with_suspended_errors (fun=0x812c390 <image_instantiate>, retval=136688652,
class=137313972, errb={really_unlikely_name_to_have_accidentally_in_a_non_errb_structure = 42},
nargs=5) at /usr/local/src/xemacs-21.2-2000-03-25/src/eval.c:2200
#9 0x819bf05 in specifier_instance_from_inst_list (specifier=137423088, matchspec=136688652,
domain=142456416, inst_list=141126504, errb={
really_unlikely_name_to_have_accidentally_in_a_non_errb_structure = 42}, no_quit=1, depth=3)
at /usr/local/src/xemacs-21.2-2000-03-25/src/specifier.c:2457
#10 0x819c23e in specifier_instance (specifier=137423088, matchspec=136688652, domain=142456416, errb={
really_unlikely_name_to_have_accidentally_in_a_non_errb_structure = 42}, no_quit=1,
no_fallback=1, depth=1) at /usr/local/src/xemacs-21.2-2000-03-25/src/specifier.c:2566
#11 0x8105667 in update_face_cachel_data (cachel=0xbffff660, domain=142456416, face=137422720)
at /usr/local/src/xemacs-21.2-2000-03-25/src/faces.c:1194
#12 0x8105f1e in get_builtin_face_cache_index (w=0x87db660, face=137422720)
at /usr/local/src/xemacs-21.2-2000-03-25/src/faces.c:1330
#13 0x81080fe in reset_face_cachels (w=0x87db660)
at /usr/local/src/xemacs-21.2-2000-03-25/src/faces.c:1380
#14 0x8179983 in redisplay_window (window=142456416, skip_selected=0)
at /usr/local/src/xemacs-21.2-2000-03-25/src/redisplay.c:5939
#15 0x817a689 in redisplay_frame (f=0x87db508, preemption_check=0)
at /usr/local/src/xemacs-21.2-2000-03-25/src/redisplay.c:6409
#16 0x817a980 in redisplay_device (d=0x8347a30, automatic=1)
at /usr/local/src/xemacs-21.2-2000-03-25/src/redisplay.c:6517
#17 0x817ac09 in redisplay_without_hooks ()
at /usr/local/src/xemacs-21.2-2000-03-25/src/redisplay.c:6576
#18 0x81817d1 in redisplay () at /usr/local/src/xemacs-21.2-2000-03-25/src/redisplay.c:6633
#19 0x80ee81f in Fnext_event (event=141753388, prompt=137192852)
at /usr/local/src/xemacs-21.2-2000-03-25/src/event-stream.c:2180
#20 0x809aec7 in Fcommand_loop_1 () at /usr/local/src/xemacs-21.2-2000-03-25/src/cmdloop.c:565
---Type <return> to continue, or q <return> to quit---
#21 0x809b193 in command_loop_1 (dummy=137192852)
at /usr/local/src/xemacs-21.2-2000-03-25/src/cmdloop.c:490
#22 0x80b8b44 in condition_case_1 (handlers=137192948, bfun=0x809b150 <command_loop_1>, barg=137192852,
hfun=0x809a320 <cmd_error>, harg=137192852) at /usr/local/src/xemacs-21.2-2000-03-25/src/eval.c:1644
#23 0x809b2c4 in command_loop_2 (dummy=137192852)
at /usr/local/src/xemacs-21.2-2000-03-25/src/cmdloop.c:252
#24 0x80b8853 in internal_catch (tag=137264660, func=0x809b280 <command_loop_2>, arg=137192852,
threw=0x0) at /usr/local/src/xemacs-21.2-2000-03-25/src/eval.c:1309
#25 0x809a71a in initial_command_loop (load_me=137192852)
at /usr/local/src/xemacs-21.2-2000-03-25/src/cmdloop.c:301
#26 0x80b4be4 in xemacs_21_2_b32_i686_pc_linux ()
at /usr/local/src/xemacs-21.2-2000-03-25/src/emacs.c:1873
#27 0x80b545f in main () at /usr/local/src/xemacs-21.2-2000-03-25/src/emacs.c:2292
#28 0x40281bf3 in __libc_start_main () from /lib/libc.so.6