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 emacs-pretest-bug@gnu.org mailing list. Please describe exactly what actions triggered the bug and the precise symptoms of the bug: I have a problem with following elisp snippet: (let ((coding-system-for-read 'utf-16-le-dos) (coding-system-for-write 'utf-16-le-dos)) (start-process "ucs" "ucs" "cat" "utf-16-studie.txt")) File utf-16-studie.txt contains some umlauts and a unicode character --- utf-16-studie.txt content --- äöüß┰ --- utf-16-studie.txt content --- and is saved with utf-16-le-dos coding system. After evaluation of the let form above the buffer "ucs" looks like this: --- ucs buffer content --- 氨瑥⠠挨摯湩ⵧ祳瑳浥昭牯爭慥⁤✠瑵ⵦ㘱氭ⵥ潤⥳ ††⠠潣楤杮猭獹整⵭潦⵲牷瑩⁥甧晴ㄭⴶ敬搭獯⤩ ⠠瑳牡⵴牰捯獥⁳∠捵≳∠捵≳∠慣≴∠瑵ⵦ㘱猭畴楤⹥汥⤢਩ Process ucs finished --- ucs buffer content --- C-u C-x h on the first glyph in ucs buffer generate following output: character: 氨 (27688, #o66050, #x6c28) preferred charset: unicode (Unicode (ISO10646)) code point: 0x6C28 syntax: w which means: word category: .:Base, C:2-byte han, c:Chinese, j:Japanese, |:line breakable buffer code: #xE6 #xB0 #xA8 file code: #xE6 #xB0 #xA8 (encoded by coding system nil) display: by this font (glyph code) x:-isas-song ti-medium-r-normal--16-160-72-72-c-160-gb2312.1980-0 (#x3031) Character code properties: customize what to show name: CJK IDEOGRAPH-6C28 general-category: Lo (Letter, Other) Also i observe the same behaviour under 22.3.1. 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'. If you would like to further debug the crash, please read the file /home/ew/Software/share/emacs/23.1.50/etc/DEBUG for instructions. In GNU Emacs 23.1.50.3 (i386-unknown-freebsd7.2, GTK+ Version 2.16.2) of 2009-10-15 on nirvana.pusto.de Windowing system distributor `The X.Org Foundation', version 11.0.10601000 configured using `configure '--prefix=/home/ew/Software'' Important settings: value of $LC_ALL: C 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: de_DE.ISO8859-1 value of $XMODIFIERS: nil locale-coding-system: nil default enable-multibyte-characters: t Major mode: Lisp Interaction Minor modes in effect: eldoc-mode: t display-time-mode: t icomplete-mode: t show-paren-mode: t partial-completion-mode: t tooltip-mode: t mouse-wheel-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t global-auto-composition-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t column-number-mode: t line-number-mode: t transient-mark-mode: t abbrev-mode: t Recent input: M-x r e p - e m - b u C-x k y e s C-x 1 M-x Recent messages: Checking 57 files in /home/ew/Software/share/emacs/23.1.50/lisp/eshell... Checking 70 files in /home/ew/Software/share/emacs/23.1.50/lisp/erc... Checking 52 files in /home/ew/Software/share/emacs/23.1.50/lisp/emulation... Checking 144 files in /home/ew/Software/share/emacs/23.1.50/lisp/emacs-lisp... Checking 24 files in /home/ew/Software/share/emacs/23.1.50/lisp/cedet... Checking 57 files in /home/ew/Software/share/emacs/23.1.50/lisp/calendar... Checking 87 files in /home/ew/Software/share/emacs/23.1.50/lisp/calc... Checking 33 files in /home/ew/Software/share/emacs/23.1.50/lisp/obsolete... Checking 1 files in /home/ew/Software/share/emacs/23.1.50/leim... Checking for load-path shadows...done Load-path shadows: None found. Features: (shadow gnus-cite flyspell ispell mail-extr gnus-msg gnus-art mm-uu mml2015 epg-config mm-view smime dig gnus-sum nnoo gnus-group gnus-undo nnmail mail-source gnus-start gnus-spec gnus-int gnus-range gnus-win message ecomplete rfc822 mml mml-sec password-cache mm-decode mm-bodies mm-encode mailcap mail-parse rfc2231 rfc2047 rfc2045 qp ietf-drums mailabbrev gmm-utils mailheader canlock sha1 hex-util hashcash gnus gnus-ems nnheader gnus-util netrc mail-utils mm-util mail-prsvr wid-edit emacsbug sendmail eldoc wepkey typist utils ibuf-ext ibuffer remember org-remember org byte-opt bytecomp byte-compile advice help-fns help-mode view advice-preload org-footnote org-src org-list org-faces org-compat org-macs easymenu time-date noutline outline easy-mmode executable browse-url ps-print ps-def lpr windmove winner ring image-dired format-spec edmacro kmacro dired-x dired-aux dired regexp-opt ffap ido time avoid icomplete paren complete tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image fringe lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar mldrag 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 loaddefs button minibuffer faces cus-face text-properties overlay md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote make-network-process dbusbind gtk x-toolkit x multi-tty emacs) -- Eduard Wiebe