Well, the stack trace looks similar, but not identical. As some additional information, this happened to me on Ubuntu Desktop 12.04. This trace seems to indicate that the Keyspan USB serial device was closed right before the panic.
** Attachment added: "Picture of stack trace" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-evdev/+bug/1018241/+attachment/3679967/+files/IMG-20130517-00186.jpg -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-input-evdev in Ubuntu. https://bugs.launchpad.net/bugs/1018241 Title: Kernel panic with ppp and keyspan usa-19hs Status in “xserver-xorg-input-evdev” package in Ubuntu: Confirmed Bug description: I am trying to use Kubuntu 12.04 i386 to connect to an ISP through dial-up. The ppp module is included in the distribution. I have a Keyspan USA-19HS USB-to-Serial adapter connected to a US Robotics 56k modem. The /etc/ppp/options file includes these three options: demand persist idle 60 Ppp connects to the ISP as expected and the remote host can be pinged. When the connection has been idle for 60 seconds, ppp attempts to close the USB device /dev/ttyUSB0 and a kernel panic occurs. Disconnecting the USB device before the timeout occurs causes pppd to terminate cleanly, but that defeats the "persist" option. Attached is a screen shot of kernel stack trace. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: xorg 1:7.6+12ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-23.36-generic-pae 3.2.14 Uname: Linux 3.2.0-23-generic-pae i686 ApportVersion: 2.0.1-0ubuntu5 Architecture: i386 Date: Tue Jun 26 23:41:58 2012 InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423) ProcEnviron: LANGUAGE= LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-evdev/+bug/1018241/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
