Recurring set-window-configuration crashes

This happens to me about 3 times a day with last weekend's CVS, in various contexts. This is pdump on FreeBSD 4.0. #0 0x284ba030 in kill () from /usr/lib/libc.so.4 #1 0x80b0c57 in fatal_error_signal (sig=6) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/emacs.c:514 #2 0xbfbfffac in ?? () #3 0x80b3c99 in assert_failed ( file=0x825bc00 "/afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/glyphs.c", line=590, expr=0x825bd04 "DOMAIN_LIVE_P (instance)") at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/emacs.c:3115 #4 0x811d294 in check_image_instance_structure (instance=143221632) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/glyphs.c:590 #5 0x8125165 in unmap_subwindow (subwindow=143221632) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/glyphs.c:4416 #6 0x8124cf8 in reset_frame_subwindow_instance_cache (f=0x84a5e00) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/glyphs.c:4184 #7 0x81c197c in Fset_window_configuration (configuration=146339840) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/window.c:5222 #8 0x80b8e83 in Ffuncall (nargs=2, args=0xbfbfe164) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/eval.c:3214 #9 0x8090f53 in execute_optimized_program ( program=0xbfbfe1c0 "\bq\210Á\b!\210Â\023Ä \210\r«\023Æ\016\a!«\r\016\bÉ a«\006Ê\016\a!\210\r«\005Ë\r!\210Ë\016\f!\207\217\013\b\001", stack_depth=2, constants_data=0x2860a1f8) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/bytecode.c:747 #10 0x809379e in Fbyte_code (instructions=676498368, constants=677421544, stack_depth=5) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/bytecode.c:2406 #11 0x80b8451 in Feval (form=677165336) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/eval.c:3014 #12 0x80be4d1 in Fprogn (args=677165348) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/eval.c:768 #13 0x80bb90f in unbind_to_hairy (count=22) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/eval.c:4654 #14 0x8090ff9 in execute_optimized_program ( program=0x8795010 "\b¬\022Á ÂV«\fÃ Ä a«\005ÅÆ!\210\016\a«\021\016\aÂV«\013Á \016\aY«\004È \210\016\t«\"\016\t9«\017Ê\016\t!¬\027ÅË\016\t\"\210ª\017Ê\016\t＠!¬\bÅË\016\t＠\"\210Ì «\tÍÎÏ\016\020!\"\210\016\021\036\022à \036\023Ô \036\025Ä \036\026Á Âa«\a×\016\026!ª\bØÙÚÁ \"!\036\eÜ\016\026!\211\036\035Ô a?­\005Þ\016\035!\036\037Þ \036 \016\t\036!\016\"\036#ä\216å\016\e!q\210\016\022\026\021æç!\210è\026'æé!\210æê!\210æë!\210ì\026)í\026*\016.«\025æï"..., stack_depth=6, constants_data=0x28622318) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/bytecode.c:760 #15 0x8090bad in funcall_compiled_function (fun=677646608, nargs=7, args=0xbfbfe548) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/bytecode.c:519 #16 0x80b901f in Ffuncall (nargs=8, args=0xbfbfe544) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/eval.c:3249 #17 0x8090f53 in execute_optimized_program ( program=0x83ae910 "\b\t\nÃa?­\002ÃÄ\211\035\036\006\036\a\036\b\036\tÊ\016\013\016\f\n¬\005\016\rª\003\016\016Ä\016\017Ä\016\020&\a\211\025Ñ\230«\t\016\020«\005\016\020ª\002\r-\207", stack_depth=9, constants_data=0x28622528) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/bytecode.c:747 #18 0x8090bad in funcall_compiled_function (fun=677646748, nargs=2, args=0xbfbfe6a8) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/bytecode.c:519 #19 0x80b901f in Ffuncall (nargs=3, args=0xbfbfe6a4) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/eval.c:3249 #20 0x8090f53 in execute_optimized_program ( program=0x88e1710 "ÀÁ «\004ê\002\fÅQÆ \"\211\036\aGÈU«\n «\006Ã\026\aª\020\016\aGÈU«\006\f\026\aª\004\016\a\024É\016\aÆ \"\211\036\n¬\aË\016\aC!\210\016\f«\aÍ\016\a!ª\005Î\016\a!*\207", stack_depth=5, constants_data=0x8786090) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/bytecode.c:747 #21 0x8090bad in funcall_compiled_function (fun=142437448, nargs=1, args=0xbfbfe804) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/bytecode.c:519 #22 0x80b901f in Ffuncall (nargs=2, args=0xbfbfe800) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/eval.c:3249 #23 0x809599b in Fcall_interactively (function=142455340, record_flag=676864912, keys=676864912) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/callint.c:946 #24 0x80b7728 in Fcommand_execute (cmd=142455340, record=676864912, keys=676864912) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/eval.c:2652 #25 0x80eb851 in execute_command_event (command_builder=0x83f5900, event=145637960) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/event-stream.c:3836 #26 0x80ec241 in Fdispatch_event (event=145637960) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/event-stream.c:4203 #27 0x809a236 in Fcommand_loop_1 () at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/cmdloop.c:579 #28 0x809a4c9 in command_loop_1 (dummy=676864912) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/cmdloop.c:494 #29 0x80be219 in condition_case_1 (handlers=676864720, bfun=0x809a48c <command_loop_1>, barg=676864912, hfun=0x809a538 <cmd_error>, harg=676864912) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/eval.c:1640 #30 0x809a627 in command_loop_2 (dummy=676864912) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/cmdloop.c:256 #31 0x80be11c in internal_catch (tag=676697080, func=0x809a5ec <command_loop_2>, arg=676864912, threw=0x0) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/eval.c:1306 #32 0x8099b6f in initial_command_loop (load_me=676864912) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/cmdloop.c:305 #33 0x80b203f in xemacs_21_2_b33_i386_unknown_freebsdelf4_0 (argc=1, argv=0xbfbfed3c, envp=0xbfbfed44, restart=0) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/emacs.c:2147 #34 0x80b3e16 in main (argc=1, argv=0xbfbfed3c, envp=0xbfbfed44) at /afs/informatik.uni-tuebingen.de/home/sperber/build/xemacs-21.2/src/emacs.c:2514 #35 0x8080111 in _start () -- Cheers =8-} Mike Friede, Völkerverständigung und überhaupt blabla