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emacs 21.1 crashed on w2k while doing ediff in *cvs* buffer


From: Richard Y. Kim
Subject: emacs 21.1 crashed on w2k while doing ediff in *cvs* buffer
Date: Fri, 26 Oct 2001 10:32:20 -0700 (PDT)

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In GNU Emacs 21.1.1 (i386-msvc-nt5.0.2195)
 of 2001-10-24 on W-RICHARDK
configured using `configure --with-msvc (12.00) --no-opt'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  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: ENU
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:


I was doing lots of "M-x cvs-examine" within a directory with 20 files
or so, then hitting "d e" keystroke to invoke ediff.
After over an hour and dozens of cvs-examine and ediff operations,
emacs crashed with "unreadable memory".

The problem seemed to be that the "row" pointer within
note_mode_line_highlight() function had an invalid value of 0xece2ae1c
as indicated by the fact the debugger signalled error with
"CXX0030: Error: expression cannot be evaluated".

The stack trace from MS Visual C++ is:

  note_mode_line_highlight(window * 0x021fd800, int 4, int 1) line 6364 + 3 
bytes
  note_mouse_highlight(frame * 0x021fdc00, int 4, int 6) line 6485 + 23 bytes
  note_mouse_movement() line 6219 + 41 bytes
  w32_read_socket() line 8246 + 13 bytes
  read_avail_input(int 0) line 6133 + 29 bytes
  gobble_input(int 0) line 6061 + 9 bytes
  get_input_pending(int * 0x011b55b8, int 1) line 6030 + 7 bytes
  detect_input_pending_run_timers(int 0) line 9444 + 12 bytes
  read_char(int 1, int 4, int * 0x0082faa8, int 288302084, int * 0x0082fbd8) 
line 2263 + 16 bytes
  read_key_sequence(int * 0x0082fd4c, int 30, int 288302084, int 0, int 1, int 
1) line 8182 + 44 bytes
  command_loop_1() line 1441 + 27 bytes
  internal_condition_case(int (void)* 0x0100a0b7 command_loop_1(void), int 
288415988, int (void)* 0x01009caa cmd_error(void)) line 1267 + 3 bytes
  command_loop_2() line 1245 + 21 bytes
  internal_catch(int 288372436, int (void)* 0x01009f7f command_loop_2(void), 
int 288302084) line 1030 + 7 bytes
  command_loop() line 1224 + 23 bytes
  recursive_edit_1() line 950 + 5 bytes
  Frecursive_edit() line 1007
  main() line 1549
  EMACS! mainCRTStartup + 180 bytes
  _start() line 136




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