> Is this a real buffer corruption, or just the display corruption? It is a real buffer corruption. I made the second gist by C-x h, M-w and pasting it to the browser. If I change the size of the frame or the window configuration, I still have a corrupted buffer. > Also, how do you invoke Emacs to reproduce the problem? By evaluating the code in the first gist. I use emacs-jedi (https://github.com/tkf/emacs-jedi). So does the original reporter. Since the problem occurs frequently, I can find strings file-content1 and file-content2 in the first gist. As for the function my/add-to-after-change-functions, I looked into the source of emacs-jedi and wrote a similar code. > Finally, does the problem go away if you set your locale to something > else, like en_US.UTF-8? No. I can also reproduce it in the live session of Xubuntu 14.04, where LANG=en_US.UTF-8. Here is the output of M-x report-emacs-bug in Emacs 24.3 in the live session. ---------------------------------------------------------------------- From: Live session user To: bug-gnu-emacs@gnu.org Subject: 24.3; revert-buffer --text follows this line-- This bug report will be sent to the Bug-GNU-Emacs mailing list and the GNU bug tracker at debbugs.gnu.org. Please check that the From: line contains a valid email address. After a delay of up to one day, you should receive an acknowledgment at that address. Please write in English if possible, as the Emacs maintainers usually do not have translators for other languages. Please describe exactly what actions triggered the bug, and the precise symptoms of the bug. If you can, give a recipe starting from `emacs -Q': If Emacs crashed, and you have the Emacs process in the gdb debugger, please include the output from the following gdb commands: `bt full' and `xbacktrace'. For information about debugging Emacs, please read the file /usr/share/emacs/24.3/etc/DEBUG. In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.10.7) of 2014-03-07 on lamiak, modified by Debian Windowing system distributor `The X.Org Foundation', version 11.0.11600000 System Description: Ubuntu 14.04.2 LTS Configured using: `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp' '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes' '--with-x-toolkit=gtk3' '--with-toolkit-scroll-bars' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2'' Important settings: value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix default enable-multibyte-characters: t Major mode: Python Minor modes in effect: tooltip-mode: t mouse-wheel-mode: t tool-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: t Recent input: C-y M-x e v a l - b u M-x r e p o r t - e m a c s - b u < return> Recent messages: For information about GNU Emacs and the GNU system, type C-h C-a. Mark set Can't guess python-indent-offset, using defaults: 4 [2 times] or: Assertion failed: (string= (buffer-string) file-content2) Load-path shadows: None found. Features: (shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils python rx easymenu comint ring ansi-color cl-macs gv cl-lib time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote make-network-process dbusbind dynamic-setting system-font-setting font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs) ----------------------------------------------------------------------