If anything causes Emacs to quit unexpectedly (e.g. sending it a SIGTERM with the kill command) it takes down OSX with it. I believe it's a full kernel panic. -- I understand that Emacs shouldn't be able to take down the os and that there's likely an os bug involved, but only Emacs triggers the os issue. FYI, I'm using emacs built with homebrew (http://mxcl.github.com/homebrew/) My configuration can be viewed at https://raw.github.com/mkomitee/dotfiles/master/emacs/init.el) In GNU Emacs 24.2.1 (x86_64-apple-darwin12.2.0) of 2013-02-16 on wat.local Configured using: `configure '--prefix=/usr/local/Cellar/emacs/24.2' '--without-dbus' '--enable-locallisppath=/usr/local/share/emacs/site-lisp' '--infodir=/usr/local/Cellar/emacs/24.2/share/info/emacs' '--without-x' 'CC=cc'' Important settings: value of $LC_ALL: nil value of $LC_COLLATE: nil value of $LC_CTYPE: en_US 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.UTF-8 value of $XMODIFIERS: nil locale-coding-system: iso-latin-1-unix default enable-multibyte-characters: t Major mode: Lisp Interaction Minor modes in effect: eldoc-mode: t elisp-slime-nav-mode: t paredit-mode: t whitespace-mode: t global-surround-mode: t surround-mode: t evil-mode: t evil-local-mode: t global-undo-tree-mode: t undo-tree-mode: t fci-mode: t textmate-mode: t global-linum-mode: t linum-mode: t ido-ubiquitous-mode: t show-paren-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-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 Recent input: ESC [ > 0 ; 9 5 ; c ESC x r e p o r t RET Recent messages: ("emacs") Loading /Users/mkomitee/.dotfiles/emacs/bundles/emacs-for-python/extensions/flymake-patch.el (source)...done Loading /Users/mkomitee/.dotfiles/emacs/bundles/emacs-for-python/extensions/flymake-cursor.el (source)...done **************************** false **************************** Pymacs loading ropemacs...done For information about GNU Emacs and the GNU system, type C-a. Load-path shadows: /Users/mkomitee/.dotfiles/emacs/bundles/emacs-for-python/extensions/yasnippet/yasnippet hides /Users/mkomitee/.emacs.d/elpa/yasnippet-0.8.0/yasnippet /Users/mkomitee/.dotfiles/emacs/bundles/emacs-for-python/extensions/yasnippet/dropdown-list hides /Users/mkomitee/.emacs.d/elpa/yasnippet-0.8.0/dropdown-list /Users/mkomitee/.dotfiles/emacs/bundles/emacs-for-python/extensions/python hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/progmodes/python Features: (shadow sort flyspell ispell 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 eldoc elisp-slime-nav etags paredit saveplace whitespace disp-table wombat-theme yasnippet dropdown-list help-mode view assoc epy-python ropemacs byte-opt warnings bytecomp byte-compile cconv macroexp flymake pymacs python skeleton derived rx cl epy-setup surround easy-mmode maps evil evil-integration evil-maps evil-commands evil-types evil-digraphs evil-search evil-ex evil-macros evil-repeat evil-states evil-core evil-common undo-tree diff rect evil-vars fill-column-indicator image textmate grep compile comint regexp-opt ansi-color ring imenu linum utils em-glob esh-util evil-autoloads fill-column-indicator-autoloads haskell-mode-autoloads markdown-mode-autoloads puppet-mode-autoloads python-mode-autoloads rainbow-mode-autoloads starter-kit-bindings-autoloads windmove starter-kit-eshell-autoloads starter-kit-lisp-autoloads elisp-slime-nav-autoloads starter-kit-autoloads edmacro kmacro smex starter-kit-misc ido-ubiquitous ido time-date paren starter-kit-defuns uniquify advice help-fns advice-preload magit-autoloads info tool-bar easymenu ido-ubiquitous-autoloads smex-autoloads find-file-in-project-autoloads idle-highlight-mode-autoloads paredit-autoloads textmate-autoloads undo-tree-autoloads yasnippet-autoloads package tabulated-list ediff-hook vc-hooks lisp-float-type lisp-mode register page menu-bar rfn-eshadow timer 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 files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote make-network-process multi-tty emacs) -- Michael Komitee