another stinkin' crash :-/

this is with andy's gutter/gc patch from this past weekend. i was composing an email from vm, when I saw the tabs disappear. i.e, not tabs, just a solid motif-blue background where the tabs would have been. XEmacs hung, thrashed awhile, then died. no lisp backtrace, i think i had killed off the xterm I started that session from. here is the gdb backtrace #0 0x403cc4e1 in __kill () from /lib/libc.so.6 #1 0x8080991 in fatal_error_signal (sig=11) at emacs.c:272 #2 0x403cc408 in __restore () at ../sysdeps/unix/sysv/linux/i386/sigaction.c:127 #3 0x809c3be in x_update_scrollbar_instance_status (w=0x88d5b10, active=1, size=0, instance=0x8abcf40) at scrollbar-x.c:250 #4 0x8095d0b in update_window_scrollbars (w=0x88d5b10, mirror=0x8b53dc0, active=1, horiz_only=0) at scrollbar.c:314 #5 0x813300d in redisplay_output_window (w=0x88d5b10) at redisplay-output.c:2251 #6 0x812833a in redisplay_window (window=143481616, skip_selected=0) at redisplay.c:6196 #7 0x812875c in redisplay_frame (f=0x8b5d2b0, preemption_check=0) at redisplay.c:6412 #8 0x8128938 in redisplay_device (d=0x84e4200, automatic=1) at redisplay.c:6490 #9 0x8128c79 in redisplay_without_hooks () at redisplay.c:6579 #10 0x812eddc in redisplay () at redisplay.c:6636 #11 0x80b1bb4 in Fsit_for (seconds=1, nodisplay=136572516) at event-stream.c:2780 #12 0x8085020 in Ffuncall (nargs=2, args=0xbfffeac0) at eval.c:3196 #13 0x8060544 in execute_optimized_program ( program=0x89656f0 "\b«\035\t«\032\tÂa«\004ê\023ÄÅÆ\t\"\tÇa«\004Ȫ\002ÉQª\002Ê\026\013\b«'\016\f¬\bÊËD\026\fª\034\016\f;«\t\016\fËD\026\fª\017Ë\016\fs¬\tÍ\016\fËC\"\026\f\212Î q\210)ÏÐ !\210ÑÂ!\207", stack_depth=4, constants_data=0x8552338) at bytecode.c:747 #14 0x80601a9 in funcall_compiled_function (fun=140000228, nargs=1, args=0xbfffebc0) at bytecode.c:519 #15 0x808506f in Ffuncall (nargs=2, args=0xbfffebbc) at eval.c:3210 #16 0x8060544 in execute_optimized_program ( program=0x89655d0 "\b\205\005\001Á\032à \034Å\f8\036\006\fA＠\036\a\016\006È_\016\a\\\211\036\t\016\nU\036\013\016\n\016\tV\036\f\016\t\026\n\016\f«\005ÍÎ!\210\b\203Ë", stack_depth=5, constants_data=0x8552c80) at bytecode.c:747 #17 0x80601a9 in funcall_compiled_function (fun=140000340, nargs=0,