Hi, I'm running xmonad-0.11 and getting outright crashes fairly frequently, often multiple times per week with my usage patterns. I can't pin it directly to any particularly specific action (like opening/closing a certain window), but it tends to happen upon returning to my machine after being away for a while with the screen locked (with gnome-screensaver, for what it's worth) -- commonly, I return to my workstation after being away from it overnight (or a weekend), and upon entering my password and returning to my desktop, xmonad catches SIGBUS and promptly dies. It has occasionally occurred under other circumstances, just during normal use (e.g., switching windows & workspaces), though the screen-unlocking situation is by far the most crash-prone. I installed it with cabal & ghc from haskell-platform 2012.2.0.0: [me@host: tmp]% cabal --version cabal-install version 0.14.0 using version 1.14.0 of the Cabal library [me@host: tmp]% ghc --version The Glorious Glasgow Haskell Compilation System, version 7.4.2 Libraries: utf8-string 0.3.7 X11 1.6.0.2 X11-xft 0.3.1 xmonad-contrib-0.11 Other potentially-relevant info: RHEL 6.3, x86_64 X.org 1.10.6, dual-head I have a core file saved via gdb from when it catches the SIGBUS -- I don't think it has anything terribly revealing in it, but I'm slightly hesitant to post it publicly, so if it would be useful for debugging, let me know and I can send it directly (23MB bzipped, 5.8MB xz'd). Please let me know if there's any other information I could provide that would be helpful. Thanks, Zev Weiss