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Another crash in scrolling.

From: David Kastrup
Subject: Another crash in scrolling.
Date: Sun, 20 Feb 2005 15:30:23 +0100
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list.

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

Ok, this time I have a screenshot.  Oh, RATS.  It is a screenshot of
the debugger window.  Ok, so I don't have one.  But there was a large
image with the cursor on it at the bottom of the window in question,
and I pressed the Page-Down key (bound to scroll-up).  Quite likely
lower in the file were more images.

Here is at least the dump, "it" does not seem set to any useful
value.  Probably I should set the breakpoint on abort in order to get
a useful backtrace.

Breakpoint 1, abort () at /home/tmp/emacs/src/emacs.c:456
456       kill (getpid (), SIGABRT);
(gdb) bt
#0  abort () at /home/tmp/emacs/src/emacs.c:456
#1  0x080997b0 in move_it_vertically_backward (it=0xe6c, dy=0)
    at /home/tmp/emacs/src/xdisp.c:6370
#2  0x080be7c0 in window_scroll (window=139571676, n=1, whole=1, noerror=0)
    at /home/tmp/emacs/src/window.c:4570
#3  0x080be95d in scroll_command (n=137490449, direction=1)
    at /home/tmp/emacs/src/window.c:4999
#4  0x080be9b7 in Fscroll_up (arg=3353) at /home/tmp/emacs/src/window.c:5015
#5  0x08171c25 in Ffuncall (nargs=2, args=0xbfe60574)
    at /home/tmp/emacs/src/eval.c:2783
#6  0x0816e938 in Fcall_interactively (function=137687969, 
    record_flag=137490449, keys=137547324) at /home/tmp/emacs/src/callint.c:877
#7  0x081194cf in Fcommand_execute (cmd=137687969, record_flag=137490449, 
    keys=137490449, special=137490449) at /home/tmp/emacs/src/keyboard.c:9697
#8  0x08120155 in command_loop_1 () at /home/tmp/emacs/src/keyboard.c:1792
#9  0x0816ff52 in internal_condition_case (bfun=0x811fdfc <command_loop_1>, 
    handlers=137551441, hfun=0x8119ddc <cmd_error>)
    at /home/tmp/emacs/src/eval.c:1385
#10 0x08114886 in command_loop_2 () at /home/tmp/emacs/src/keyboard.c:1319
#11 0x0816fe61 in internal_catch (tag=3353, func=0x8114868 <command_loop_2>, 
    arg=137490449) at /home/tmp/emacs/src/eval.c:1144
#12 0x08114695 in command_loop () at /home/tmp/emacs/src/keyboard.c:1298
#13 0x0811472f in recursive_edit_1 () at /home/tmp/emacs/src/keyboard.c:991
#14 0x0811482a in Frecursive_edit () at /home/tmp/emacs/src/keyboard.c:1052
#15 0x08113bb1 in main (argc=3, argv=0xbfe60d84)
    at /home/tmp/emacs/src/emacs.c:1766
(gdb) xbacktrace

In GNU Emacs (i686-pc-linux-gnu, GTK+ Version 2.6.2)
 of 2005-02-20 on lola.goethe.zz
Distributor `The X.Org Foundation', version 11.0.60802000
configured using `configure '--prefix=/usr/local/emacs-21' '--with-gtk' 

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: en_US
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  gnus-undo-mode: t
  TeX-PDF-mode: t
  auto-compression-mode: t
  desktop-save-mode: t
  file-name-shadow-mode: t
  iswitchb-mode: t
  minibuffer-electric-default-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  line-number-mode: t

Recent input:
M-x g n u <tab> <return> n n 3 <return> SPC E q M-x 
r e p o r t - e m a c s - b u <tab> <return>

Recent messages:
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David Kastrup, Kriemhildstr. 15, 44793 Bochum

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