Ubuntu
emacs21 package

emacs21 aborts while typing

Bug #85146 reported by czapszys
2
Affects Status Importance Assigned to Milestone
emacs21 (Ubuntu)
Confirmed
Medium
Unassigned

Bug Description

Binary package hint: emacs21

A few times per day, when I'm typing or scrolling with the keyboard, emacs aborts and dumps core.
I rebuilt a not-stripped emacs21 on to get a stack trace. Here it is:

(gdb) bt
#0 0xffffe410 in __kernel_vsyscall ()
#1 0xb7b7aba6 in kill () from /lib/tls/i686/cmov/libc.so.6
#2 0x080de909 in fatal_error_signal (sig=6)
    at /home/czapszys/tmp/src/emacs21-21.4a/src/emacs.c:354
#3 <signal handler called>
#4 0xffffe410 in __kernel_vsyscall ()
#5 0xb7b7aba6 in kill () from /lib/tls/i686/cmov/libc.so.6
#6 0x080dd13b in abort () at /home/czapszys/tmp/src/emacs21-21.4a/src/emacs.c:387
#7 0x0806c559 in try_window_id (w=0x84d1ae8)
    at /home/czapszys/tmp/src/emacs21-21.4a/src/xdisp.c:12026
#8 0x080712db in redisplay_window (window=1213012712, just_this_one_p=1)
    at /home/czapszys/tmp/src/emacs21-21.4a/src/xdisp.c:10260
#9 0x0807370b in redisplay_internal (preserve_echo_area=<value optimized out>)
    at /home/czapszys/tmp/src/emacs21-21.4a/src/xdisp.c:8910
#10 0x080e8506 in read_char (commandflag=1, nmaps=2, maps=0xbfdfc680, prev_event=405320748,
    used_mouse_menu=0xbfdfc70c) at /home/czapszys/tmp/src/emacs21-21.4a/src/keyboard.c:2299
#11 0x080e9c2d in read_key_sequence (keybuf=0xbfdfc7c8, bufsize=30, prompt=405320748,
    dont_downcase_last=0, can_return_switch_frame=1, fix_current_buffer=1)
    at /home/czapszys/tmp/src/emacs21-21.4a/src/keyboard.c:8221
#12 0x080ebb5d in command_loop_1 () at /home/czapszys/tmp/src/emacs21-21.4a/src/keyboard.c:1451
#13 0x08139b7d in internal_condition_case (bfun=0x80eb970 <command_loop_1>,
    handlers=405417092, hfun=0x80e5c00 <cmd_error>)
    at /home/czapszys/tmp/src/emacs21-21.4a/src/eval.c:1267
#14 0x080e57b3 in command_loop_2 () at /home/czapszys/tmp/src/emacs21-21.4a/src/keyboard.c:1245
#15 0x08139c32 in internal_catch (tag=405378676, func=0x80e5790 <command_loop_2>,
    arg=405320748) at /home/czapszys/tmp/src/emacs21-21.4a/src/eval.c:1030
#16 0x080e58f7 in command_loop () at /home/czapszys/tmp/src/emacs21-21.4a/src/keyboard.c:1224
#17 0x080e599e in recursive_edit_1 ()
    at /home/czapszys/tmp/src/emacs21-21.4a/src/keyboard.c:950
#18 0x080e5abb in Frecursive_edit ()
    at /home/czapszys/tmp/src/emacs21-21.4a/src/keyboard.c:1006
#19 0x080ddc65 in main (argc=2, argv=0xbfdfcf04, envp=Cannot access memory at address 0xe
)
    at /home/czapszys/tmp/src/emacs21-21.4a/src/emacs.c:1547

The failure seems to be in frame 7.

Micah Cowan (micahcowan)
Changed in emacs21:
importance: Undecided → Medium
status: Unconfirmed → Confirmed
Revision history for this message
Micah Cowan (micahcowan) wrote :

Notes from the backtrace: The crash is due to a call to abort() at xdisp.c:12026 (which emacs then catches and rethrows, in fatal_error_signal() in emacs). It is a deliberate abortion (fall-through assertion) in try_window_id, at the final else clause of:

if (first_unchanged_at_end_row
      && first_unchanged_at_end_row->y < it.last_visible_y
      && !last_text_row_at_end)
 ...
else if (last_text_row_at_end)
 ...
else if (last_text_row)
 ...
else if (first_unchanged_at_end_row == NULL
    && last_text_row == NULL
    && last_text_row_at_end == NULL)
 ...
else
  abort(); // <<=============

try_window_id() has been passed the value "selected_window"; so there must be something wrong with that value or the state of the currently selected window (I'd guess the latter).

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