Hi! I was trying to remove a region in gnus when seeing this "behaviour": "XEmacs 21.2 (beta44) \"Thalia\" [Lucid] (i386-unknown-freebsd3.3, Mule) of Tue Feb 20 2001 on lamia.LF.net" This includes Matt's recent patches. Lisp-Trace call-interactively(kill-region) # (condition-case ... . error) # (catch top-level ...) Abort trap (core dumped) C-Trace #0 0x185653d0 in kill () from /usr/lib/libc.so.3 (gdb) where #0 0x185653d0 in kill () from /usr/lib/libc.so.3 #1 0x80c77c3 in fatal_error_signal (sig=6) at emacs.c:535 #2 0xbfbfdfdc in ?? () #3 0x80cabda in assert_failed (file=0x830cd06 "lisp.h", line=1397, expr=0x830ce60 "RECORD_TYPEP (obj, lrecord_type_marker)") at emacs.c:3214 #4 0x81abcd7 in marker_position (marker={gu = {type = Lisp_Type_Int_Even, val = 35564375}, s = {bits = 1, val = 71128750}, u = {bits = 1, val = 71128750}, ui = 142257501, i = 142257501, v = 0x87aad5d, cv = 0x87aad5d}) at lisp.h:1397 #5 0x80a49e4 in Fcall_interactively (function={gu = {type = Lisp_Type_Record, val = 102227456}, s = {bits = 0, val = 204454912}, u = {bits = 0, val = 204454912}, ui = 408909824, i = 408909824, v = 0x185f7800, cv = 0x185f7800}, record_flag={gu = {type = Lisp_Type_Record, val = 102242654}, s = {bits = 0, val = 204485308}, u = {bits = 0, val = 204485308}, ui = 408970616, i = 408970616, v = 0x18606578, cv = 0x18606578}, keys={gu = {type = Lisp_Type_Record, val = 102242654}, s = {bits = 0, val = 204485308}, u = {bits = 0, val = 204485308}, ui = 408970616, i = 408970616, v = 0x18606578, cv = 0x18606578}) at callint.c:936 #6 0x80cfabd in Fcommand_execute (cmd={gu = {type = Lisp_Type_Record, val = 102227456}, s = {bits = 0, val = 204454912}, u = {bits = 0, val = 204454912}, ui = 408909824, i = 408909824, v = 0x185f7800, cv = 0x185f7800}, record_flag={gu = {type = Lisp_Type_Record, val = 102242654}, s = {bits = 0, val = 204485308}, u = {bits = 0, val = 204485308}, ui = 408970616, i = 408970616, v = 0x18606578, cv = 0x18606578}, keys={gu = {type = Lisp_Type_Record, val = 102242654}, s = {bits = 0, val = 204485308}, u = {bits = 0, val = 204485308}, ui = 408970616, i = 408970616, v = 0x18606578, cv = 0x18606578}) at eval.c:2970 #7 0x812de09 in execute_command_event (command_builder=0x84cd440, event={ gu = {type = Lisp_Type_Record, val = 34886918}, s = {bits = 0, val = 69773836}, u = {bits = 0, val = 69773836}, ui = 139547672, i = 139547672, v = 0x8515418, cv = 0x8515418}) at event-stream.c:3834 #8 0x812ea2d in Fdispatch_event (event={gu = {type = Lisp_Type_Record, val = 34886918}, s = {bits = 0, val = 69773836}, u = {bits = 0, val = 69773836}, ui = 139547672, i = 139547672, v = 0x8515418, cv = 0x8515418}) at event-stream.c:4165 #9 0x80ae6fd in Fcommand_loop_1 () at cmdloop.c:583 #10 0x80ae9a2 in command_loop_1 (dummy={gu = {type = Lisp_Type_Record, val = 102242654}, s = {bits = 0, val = 204485308}, u = {bits = 0, val = 204485308}, ui = 408970616, i = 408970616, v = 0x18606578, cv = 0x18606578}) at cmdloop.c:494 #11 0x80d6efa in condition_case_1 (handlers={gu = {type = Lisp_Type_Record, val = 102242558}, s = {bits = 0, val = 204485116}, u = {bits = 0, val = 204485116}, ui = 408970232, i = 408970232, v = 0x186063f8, cv = 0x186063f8}, bfun=0x80ae964 <command_loop_1>, barg={gu = { type = Lisp_Type_Record, val = 102242654}, s = {bits = 0, val = 204485308}, u = {bits = 0, val = 204485308}, ui = 408970616, i = 408970616, v = 0x18606578, cv = 0x18606578}, hfun=0x80aea14 <cmd_error>, harg={gu = {type = Lisp_Type_Record, val = 102242654}, s = {bits = 0, val = 204485308}, u = {bits = 0, val = 204485308}, ui = 408970616, i = 408970616, v = 0x18606578, cv = 0x18606578}) at eval.c:1651 #12 0x80aeb0f in command_loop_2 (dummy={gu = {type = Lisp_Type_Record, val = 102242654}, s = {bits = 0, val = 204485308}, u = {bits = 0, val = 204485308}, ui = 408970616, i = 408970616, v = 0x18606578, cv = 0x18606578}) at cmdloop.c:256 #13 0x80d6dfc in internal_catch (tag={gu = {type = Lisp_Type_Record, val = 102194036}, s = {bits = 0, val = 204388072}, u = {bits = 0, val = 204388072}, ui = 408776144, i = 408776144, v = 0x185d6dd0, cv = 0x185d6dd0}, func=0x80aead0 <command_loop_2>, arg={gu = { type = Lisp_Type_Record, val = 102242654}, s = {bits = 0, val = 204485308}, u = {bits = 0, val = 204485308}, ui = 408970616, i = 408970616, v = 0x18606578, cv = 0x18606578}, threw=0x0) at eval.c:1317 #14 0x80adf67 in initial_command_loop (load_me={gu = {type = Lisp_Type_Record, val = 102242654}, s = {bits = 0, val = 204485308}, u = {bits = 0, val = 204485308}, ui = 408970616, i = 408970616, v = 0x18606578, cv = 0x18606578}) at cmdloop.c:305 #15 0x80c8d21 in xemacs_21_2_b44_i386_unknown_freebsd3_3 (argc=4, argv=0xbfbfd680, envp=0xbfbfd694, restart=0) at emacs.c:2253 #16 0x80cadfe in main (argc=4, argv=0xbfbfd680, envp=0xbfbfd694) at emacs.c:2620 norbert.