First, please accept my apologies for the poor bug report. I'm calling it a poor bug report because I've been unable to find a simple recipe that easily reproduces the behavior I'm seeing. The behavior itself is easy to describe: while providing keyboard input, sometimes point jumps to a (seemingly) random place in the buffer. Some examples - while holding the UP arrow to slowly scroll upwards in the current buffer, point suddenly `jumps' up, over several screenfuls of text - while typing (ordinary alphanumeric text), point jumps to a line near the top of the file. I've noticed this most often when using emacs to write java code. I'll be typing away in the body of a method, and point will jump to a position in the file header comment, several hundred lines earlier. This doesn't happen very often. Perhaps 3--4 times during a work day. I have not found a way to make it happen on demand. I've experienced this behavior in 25.0.90 and 25.0.91, but not in earlier versions. I typically see this behavior in java-mode and org-mode. That said, the vast majority of my emacs usage involves java-mode and org-mode. I've seen this behavior on two different x86_64 GNU/Linux systems. One system runs Redhat 6.4, and the other runs OpenSUSE 13.2. Both systems have `standard' USB keyboards, and optical mice. If I'm able to find a nice set of steps to reproduce, I'll add them to this bug report. If there are suggestions for gathering/providing more information, please let me know, and I'll gladly try them. In GNU Emacs 25.0.91.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.14.15) of 2016-02-16 built on sunny Windowing system distributor 'The X.Org Foundation', version 11.0.11601000 System Description: openSUSE 13.2 (Harlequin) (x86_64) Configured using: 'configure --prefix=/usr/local/emacs-25.0.91' Configured features: XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS NOTIFY ACL GNUTLS LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 Important settings: value of $LC_COLLATE: C value of $LANG: en_US.UTF-8 value of $XMODIFIERS: @im=ibus locale-coding-system: utf-8-unix Major mode: Lisp Interaction Minor modes in effect: tooltip-mode: t global-eldoc-mode: t electric-indent-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 messages: For information about GNU Emacs and the GNU system, type C-h C-a. Load-path shadows: None found. Features: (shadow sort mail-extr emacsbug message dired format-spec rfc822 mml mml-sec epg epg-config gnus-util mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util help-fns help-mode easymenu cl-loaddefs pcase cl-lib mail-prsvr mail-utils time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese charscript case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer cl-preloaded nadvice loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote dbusbind inotify dynamic-setting system-font-setting font-render-setting move-toolbar gtk x-toolkit x multi-tty make-network-process emacs) Memory information: ((conses 16 87179 5415) (symbols 48 19682 0) (miscs 40 38 110) (strings 32 14733 4487) (string-bytes 1 422301) (vectors 16 12267) (vector-slots 8 425290 4370) (floats 8 166 37) (intervals 56 198 0) (buffers 976 11) (heap 1024 44093 1008))
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