Hi Josep, yes this bug appeared after an upgrade, I was previously using kernel 3.2.0-47 and this bug did not occur. I am attaching another trace that I got again with kernel 3.2.0-54, the overall symptom is the same (system crashes) though the kernel log looks a bit different.
I'll give a try to the mainline kernel and let you know. ** Attachment added: "another trace with kernel 3.2.0-54" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1229118/+attachment/3856999/+files/kernel-log-2.txt -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1229118 Title: BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 Status in “linux” package in Ubuntu: Incomplete Bug description: During normal use, the system crashed reporting this message: BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 I am attaching the kernel backtrace that was dumped to the console and to kern.log ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.2.0-54-generic 3.2.0-54.82 ProcVersionSignature: Ubuntu 3.2.0-54.82-generic 3.2.50 Uname: Linux 3.2.0-54-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu17.4 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: nicola 2291 F.... pulseaudio Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xe2e60000 irq 47' Mixer name : 'Intel CougarPoint HDMI' Components : 'HDA:111d76e7,10280492,00100102 HDA:80862805,80860101,00100000' Controls : 37 Simple ctrls : 13 Date: Mon Sep 23 12:06:37 2013 EcryptfsInUse: Yes InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1) MachineType: Dell Inc. Latitude E6320 MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-54-generic root=UUID=1efb2c8a-140f-4f44-9a98-fe9c6810c31c ro crashkernel=384M-2G:64M,2G-:128M quiet splash drm_kms_helper.poll=0 vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.2.0-54-generic N/A linux-backports-modules-3.2.0-54-generic N/A linux-firmware 1.79.6 SourcePackage: linux StagingDrivers: mei UpgradeStatus: Upgraded to precise on 2012-08-27 (392 days ago) dmi.bios.date: 03/07/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A17 dmi.board.name: 0GJF11 dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA17:bd03/07/2013:svnDellInc.:pnLatitudeE6320:pvr01:rvnDellInc.:rn0GJF11:rvrA01:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E6320 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1229118/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp