Assuming that backtrace is accurate, looks like a race condition that can result in device->proximity to be undefined sometimes.
** Patch added: "504_exevent_proximity_null_ptr_check.patch" https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/764700/+attachment/2193316/+files/504_exevent_proximity_null_ptr_check.patch -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/764700 Title: Xorg crashed with SIGABRT in utouch_frame_sync() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/764700/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
