Re: [Bug: 21.5-b11] assertion failed

>>> "SJT" == Stephen J Turnbull <stephen(a)xemacs.org&gt; writes: >>>>>> "Pete" == Pete Siemsen <siemsen(a)ucar.edu&gt; writes: SJT> Thanks for the report. I don't know what is causing these, but I SJT> just saw one, too. I sent in a bug report about this one sometime last week. I can still see these crashes. SJT> I don't think Perl has anything to do with it, it's native widgets, I SJT> think (I see them sporadically in customize buffers and a local SJT> library I have that uses native widgets via widget.el, always when SJT> clicking on something). SJT> [4 uninteresting frames elided] Pete> #5 0x9c5a4 in zero_out_command_line_status_vars () at emacs.c:4283 SJT> You only got 5 frames of backtrace? Urk. Does this help? Program received signal SIGABRT, Aborted. 0x28624b64 in kill () from /usr/lib/libc.so.4 (gdb) bt #0 0x28624b64 in kill () from /usr/lib/libc.so.4 #1 0x2866610a in abort () from /usr/lib/libc.so.4 #2 0x80c5eaf in really_abort () at emacs.c:4394 #3 0x80c5c07 in assert_failed (file=0x82e948c "gui-x.c", line=284, expr=0x82e82c0 "RECORD_TYPEP (obj, lrecord_type_cons)") at emacs.c:3728 #4 0x82271ff in popup_selection_callback (widget=0x8d86200, ignored_id=65544, client_data=0x8d508dc) at lisp.h:1700 #5 0x8249b75 in xlw_tab_control_callback (w=0x8d86200, client_data=0x8a95b60, call_data=0x8d86200) at lwlib-Xlw.c:363 #6 0x28432db9 in XtCallCallbackList () from /usr/X11R6/lib/libXt.so.6 #7 0x824de0d in XawTabsSetTop (w=0x8d86200, callCallbacks=1) at

#8 0x824ee9c in TabsSelect (w=0x8cdde00, event=0xbfbff440, params=0x0, num_params=0x2846f0b4) at xlwtabs.c:1079 #9 0x2845fa82 in HandleActions () from /usr/X11R6/lib/libXt.so.6 #10 0x2845ff03 in HandleSimpleState () from /usr/X11R6/lib/libXt.so.6 #11 0x28460441 in _XtTranslateEvent () from /usr/X11R6/lib/libXt.so.6 #12 0x2843dd6d in XtDispatchEventToWidget () from /usr/X11R6/lib/libXt.so.6 #13 0x2843e701 in _XtDefaultDispatcher () from /usr/X11R6/lib/libXt.so.6 #14 0x2843e94e in XtDispatchEvent () from /usr/X11R6/lib/libXt.so.6 #15 0x284494c5 in XtAppProcessEvent () from /usr/X11R6/lib/libXt.so.6 #16 0x820c80e in emacs_Xt_next_event (emacs_event=0x84cf48c) at

#17 0x80dc377 in event_stream_next_event (event=0x84cf48c) at event-stream.c:2078 #18 0x80dc6bb in next_event_internal (target_event=139261068, allow_queued=1) at event-stream.c:2142 #19 0x80dcd9a in Fnext_event (event=139261068, prompt=678174468) at event-stream.c:2367 #20 0x80a2afc in Fcommand_loop_1 () at cmdloop.c:568 #21 0x80a2dca in command_loop_1 (dummy=678174468) at cmdloop.c:488 #22 0x80c83c7 in condition_case_1 (handlers=678172356, bfun=0x80a2d8c <command_loop_1>, barg=678174468, hfun=0x80a2e3c <cmd_error>, harg=678174468) at eval.c:1917 #23 0x80a2f33 in command_loop_2 (dummy=678174468) at cmdloop.c:251 #24 0x80d109c in internal_catch (tag=677963412, func=0x80a2ef0 <command_loop_2>, arg=678174468, threw=0x0, thrown_tag=0x0) at eval.c:1527 #25 0x80a27ac in initial_command_loop (load_me=678174468) at cmdloop.c:300 #26 0x80c3e83 in xemacs_21_5_b11_i386_unknown_freebsd4_7 (argc=1, argv=0xbfbff98c, envp=0xbfbff994, restart=0) at emacs.c:2400 #27 0x80c5fa0 in main (argc=1, argv=0xbfbff98c, envp=0xbfbff994) at emacs.c:2830 SJT> If you go up a few frames (gdb command is "up" oddly enough ;-), and SJT> do SJT> (gdb) print * (struct lrecord_header *) client_data SJT> $5 = {type = 63, mark = 0, c_readonly = 1, lisp_readonly = 1, unused =

SJT> (gdb) print (enum lrecord_type) lrecord_type_free + 0 SJT> $11 = 63 SJT> Suspicious, huh? SJT> I'd be interested to know what the type member is in your crash. The SJT> fact that I got "free" suggests uninitialized data somewhere, but if SJT> your stack was smashed (as the small number of frames suggests), then SJT> that could just be a random number. If you get a different number, SJT> you can just report it, but if you're curious the list of types is in SJT> enum lrecord_type in src/lrecord.h. I assume in the crash above it would be in frame 5. I get the following: (gdb) fr 5 #5 0x8249b75 in xlw_tab_control_callback (w=0x8d86200, client_data=0x8a95b60, call_data=0x8d86200) at lwlib-Xlw.c:363 363 instance->info->selection_cb (w, id, widget_arg); (gdb) p *(struct lrecord_header*)client_data $1 = {type = 0, mark = 0, c_readonly = 1, lisp_readonly = 1, unused = 72123} Actually I am quite interested in debugging this crash and I have been trying to read the Internals info doc. Its been a little slow though, there is so much to learn. Someday soon... Kaarthik