Emacs crashes while scrolling

[Stephen Berman]

Symptoms:


Since I updated from CVS on February 23, Emacs has crashed several
times while I was scrolling (both with the mouse wheel and with the
down arrow).  The last two times I caught with the debugger.  The
first backtrace looks bad but not very helpful to me:

Program received signal SIGSEGV, Segmentation fault.
handle_async_input () at keyboard.c:6765
6765    }
(gdb) backtrace
#0  handle_async_input () at keyboard.c:6765
Cannot access memory at address 0x4
(gdb) s
0x4064d9ff in __libc_sigaction () from /lib/i686/libc.so.6
(gdb) s
Single stepping until exit from function __libc_sigaction,
which has no line number information.
0x4064daea in sigaction () from /lib/i686/libc.so.6
(gdb) n
Single stepping until exit from function sigaction,
which has no line number information.
sys_signal (signal_number=11, action=0) at sysdep.c:2797
2797      return (old_action.sa_handler);
(gdb) c
Continuing.
Fatal error (11)
Program received signal SIGSEGV, Segmentation fault.
0x4064db71 in kill () from /lib/i686/libc.so.6

The second backtrace has a lot more information, maybe it's useful:

Program received signal SIGABRT, Aborted.
0x4064db71 in kill () from /lib/i686/libc.so.6
(gdb) backtrace
#0  0x4064db71 in kill () from /lib/i686/libc.so.6
#1  0x0811c0a6 in abort () at emacs.c:424
#2  0x080f7f16 in handle_one_xevent (dpyinfo=0x289b, eventp=0xbfffacf0,
    bufp_r=0xbfffaf24, numcharsp=0xbfffaf28, finish=0x83ca258) at xterm.c:6595
#3  0x080f6b14 in event_handler_gdk (gxev=0xbfffacf0, ev=0x86a9220, data=0x0)
    at xterm.c:5754
#4  0x402baa48 in gdk_event_get_graphics_expose ()
   from /opt/gnome/lib/libgdk-x11-2.0.so.0
#5  0x402bb343 in gdk_add_client_message_filter ()
   from /opt/gnome/lib/libgdk-x11-2.0.so.0
#6  0x402bca8f in gdk_add_client_message_filter ()
   from /opt/gnome/lib/libgdk-x11-2.0.so.0
#7  0x402bcc99 in gdk_add_client_message_filter ()
   from /opt/gnome/lib/libgdk-x11-2.0.so.0
#8  0x40400148 in g_main_dispatch () from /opt/gnome/lib/libglib-2.0.so.0
#9  0x404011a8 in g_main_context_dispatch ()
   from /opt/gnome/lib/libglib-2.0.so.0
#10 0x404015a8 in g_main_context_iterate ()
   from /opt/gnome/lib/libglib-2.0.so.0
#11 0x404016fc in g_main_context_iteration ()
   from /opt/gnome/lib/libglib-2.0.so.0
#12 0x400fe99e in gtk_main_iteration () from /opt/gnome/lib/libgtk-x11-2.0.so.0
#13 0x080f83c6 in XTread_socket (sd=0, bufp=0xbfffc0b4, numchars=1, expected=1)
#14 0x081261ca in read_avail_input (expected=1) at keyboard.c:6598
#15 0x0812643a in handle_async_input () at keyboard.c:6754
#16 0x0816a5c4 in Fgarbage_collect () at alloc.c:4595
#17 0x0817edf8 in Feval (form=-1458786600) at eval.c:1979
#18 0x0817eed3 in Feval (form=-1472138336) at eval.c:2136
#19 0x0817c874 in Fprogn (args=65364) at eval.c:408
#20 0x0817fe52 in funcall_lambda (fun=144338888, nargs=1,
    arg_vector=0xbfffc3f4) at eval.c:2908
#21 0x0817f875 in Ffuncall (nargs=2, args=0xbfffc3f0) at eval.c:2785
#22 0x0817efdc in Feval (form=138174868) at eval.c:2090
#23 0x0817ef4e in Feval (form=-2009314032) at eval.c:2065
#24 0x0817c9c0 in Fsetq (args=0) at eval.c:510
#25 0x0817f0a5 in Feval (form=-2009309428) at eval.c:2027
#26 0x0817c874 in Fprogn (args=65364) at eval.c:408
#27 0x0817fe52 in funcall_lambda (fun=145814200, nargs=1,
    arg_vector=0xbfffc764) at eval.c:2908
#28 0x0817f875 in Ffuncall (nargs=2, args=0xbfffc760) at eval.c:2785
#29 0x0817f628 in call1 (fn=-1464798536, arg1=682377128) at eval.c:2522
#30 0x08197291 in map_obarray (obarray=-2001761304, fn=0x81972a0 <mapatoms_1>,
    arg=-1464798536) at lread.c:3330
#31 0x081972eb in Fmapatoms (function=-1464798536, obarray=0) at lread.c:3354
#32 0x0817efdc in Feval (form=138178528) at eval.c:2090
#33 0x0817c874 in Fprogn (args=65364) at eval.c:408
#34 0x0817d535 in Flet (args=-1464798464) at eval.c:936
#35 0x0817f0a5 in Feval (form=-2009309164) at eval.c:2027
#36 0x0817eed3 in Feval (form=-1465295008) at eval.c:2136
#37 0x0817ef4e in Feval (form=-2009306784) at eval.c:2065
#38 0x0817c874 in Fprogn (args=65364) at eval.c:408
#39 0x0817fe52 in funcall_lambda (fun=144327432, nargs=1,
    arg_vector=0xbfffcbd0) at eval.c:2908
#40 0x0817fb21 in apply_lambda (fun=-1466285304, args=-1464500952, eval_flag=1)
    at eval.c:2837
#41 0x0817edca in Feval (form=-1466285304) at eval.c:2138
#42 0x0817c874 in Fprogn (args=65364) at eval.c:408
#43 0x0817d535 in Flet (args=-1466286216) at eval.c:936
#44 0x0817f0a5 in Feval (form=-2009309164) at eval.c:2027
#45 0x0817c874 in Fprogn (args=65364) at eval.c:408
#46 0x0817fe52 in funcall_lambda (fun=144411512, nargs=0,
    arg_vector=0xbfffcee0) at eval.c:2908
#47 0x0817fb21 in apply_lambda (fun=-1466201224, args=675323896, eval_flag=1)
    at eval.c:2837
#48 0x0817edca in Feval (form=-1466201224) at eval.c:2138
#49 0x0817d569 in Flet (args=-1466202720) at eval.c:920
#50 0x0817f0a5 in Feval (form=-2009309164) at eval.c:2027
#51 0x0817c874 in Fprogn (args=65364) at eval.c:408
#52 0x0817fe52 in funcall_lambda (fun=144409080, nargs=0,
    arg_vector=0xbfffd214) at eval.c:2908
#53 0x0817f875 in Ffuncall (nargs=1, args=0xbfffd210) at eval.c:2785
#54 0x0817efdc in Feval (form=138174868) at eval.c:2090
#55 0x0817c9c0 in Fsetq (args=0) at eval.c:510
#56 0x0817f0a5 in Feval (form=-2009309428) at eval.c:2027
#57 0x0817c874 in Fprogn (args=65364) at eval.c:408
#58 0x0817f0a5 in Feval (form=-2009309500) at eval.c:2027
#59 0x0817c79c in Fif (args=-1457696000) at eval.c:356
#60 0x0817f0a5 in Feval (form=-2009309548) at eval.c:2027
#61 0x0817eed3 in Feval (form=-1472138616) at eval.c:2136
#62 0x0817c874 in Fprogn (args=65364) at eval.c:408
#63 0x0817fe52 in funcall_lambda (fun=145368560, nargs=1,
    arg_vector=0xbfffd6e0) at eval.c:2908
#64 0x0817fb21 in apply_lambda (fun=-1465244176, args=675323944, eval_flag=1)
    at eval.c:2837
#65 0x0817edca in Feval (form=-1465244176) at eval.c:2138
#66 0x0817d569 in Flet (args=-1465226160) at eval.c:920
#67 0x0817f0a5 in Feval (form=-2009309164) at eval.c:2027
#68 0x0817c874 in Fprogn (args=65364) at eval.c:408
#69 0x0817c7ba in Fif (args=-1465224224) at eval.c:357
#70 0x0817f0a5 in Feval (form=-2009309548) at eval.c:2027
#71 0x0817c874 in Fprogn (args=65364) at eval.c:408
#72 0x0817fe52 in funcall_lambda (fun=145386648, nargs=0,
    arg_vector=0xbfffdae0) at eval.c:2908
#73 0x0817fb21 in apply_lambda (fun=-1465226088, args=675323896, eval_flag=1)
    at eval.c:2837
#74 0x0817edca in Feval (form=-1465226088) at eval.c:2138
#75 0x0817ddf4 in internal_condition_case_1 (bfun=0x817ebb0 <Feval>,
    arg=-1465229312, handlers=675323944, hfun=0x80942f0 <safe_eval_handler>)
    at eval.c:1374
#76 0x0809437c in safe_eval (sexpr=-1465229312) at xdisp.c:1831
#77 0x080aa573 in display_mode_element (it=0xbfffddd0, depth=1, field_width=0,
    precision=0, elt=-1465227296, props=675323896, risky=0) at xdisp.c:15231
#78 0x080a9e2e in display_mode_line (w=0x8f4b820, face_id=HEADER_LINE_FACE_ID,
    format=-1465227296) at xdisp.c:14894
#79 0x080a9d87 in display_mode_lines (w=0x8f4b820) at xdisp.c:14858
#80 0x080a39d8 in redisplay_window (window=-1997228000, just_this_one_p=1)
    at xdisp.c:11817
#81 0x080a081d in redisplay_window_1 (window=-1997228000) at xdisp.c:10363
#82 0x0817ddf4 in internal_condition_case_1 (
    bfun=0x80a07f0 <redisplay_window_1>, arg=-1997228000,
    handlers=-1472132872, hfun=0x80a0790 <redisplay_window_error>)
    at eval.c:1374
#83 0x0809facb in redisplay_internal (preserve_echo_area=0) at xdisp.c:9982
#84 0x0809ea5d in redisplay () at xdisp.c:9292
#85 0x0812102b in read_char (commandflag=1, nmaps=2, maps=0xbfffeb50,
    prev_event=675323896, used_mouse_menu=0xbfffeb88) at keyboard.c:2467
#86 0x08128995 in read_key_sequence (keybuf=0xbfffecb0, bufsize=30,
    prompt=675323896, dont_downcase_last=0, can_return_switch_frame=1,
    fix_current_buffer=1) at keyboard.c:8757
#87 0x0811ed97 in command_loop_1 () at keyboard.c:1476
#88 0x0817dced in internal_condition_case (bfun=0x811ec00 <command_loop_1>,
    handlers=675384768, hfun=0x811e7c0 <cmd_error>) at eval.c:1333
#89 0x0811eaab in command_loop_2 () at keyboard.c:1264
#90 0x0817d84a in internal_catch (tag=0, func=0x811ea90 <command_loop_2>,
    arg=675323896) at eval.c:1094
#91 0x0811ea61 in command_loop () at keyboard.c:1243
#92 0x0811e522 in recursive_edit_1 () at keyboard.c:959
#93 0x0811e65f in Frecursive_edit () at keyboard.c:1015
#94 0x0811cde3 in main (argc=1, argv=0xbffff294) at emacs.c:1682
(gdb) c
Continuing.
Fatal error (6)
Program exited with code 01.


In GNU Emacs 21.3.50.2 (i686-pc-linux-gnu, GTK+ Version 2.2.3)
 of 2004-02-25 on feldmann
configured using `configure '--with-x-toolkit=gtk''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  gnus-topic-mode: t
  gnus-undo-mode: t
  show-paren-mode: t
  tabbar-mode: t
  auto-compression-mode: t
  display-time-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  unify-8859-on-encoding-mode: t
  column-number-mode: t
  line-number-mode: t

Recent input:
<help-echo> M-x g u <return> M-x r e p o <tab> r <tab> 
<return>

Recent messages:
Opening nndoc server on /home/steve/Mail/Dad...done
Opening nndoc server on /home/steve/Mail/Chris...done
Opening nndoc server on /home/steve/Bewerbung/cvmail...done
Opening nndoc server on /home/steve/Mail/Annie...done
Opening nndoc server on /home/steve/Mail/Arline...done
Checking new news...done
Loading gnus-topic...done
Making completion list...
Loading eieio-opt...done
Loading emacsbug...done