Steps to reproduce: Establish a bluetooth DUN connection using a mobile phone/tablet/etc., and then disconnect the DUN connection, and the kernel panics:
https://bugs.launchpad.net/ubuntu/+source/linux-lts-raring/+bug/1256811/+attachment/3921449/+files/kmsg-crash-0.txt
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.8.0-32-generic 3.8.0-32.47~precise1
ProcVersionSignature: Ubuntu 3.8.0-32.47~precise1-generic 3.8.13.10
Uname: Linux 3.8.0-32-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.8.0-32-generic.
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: georg 1607 F.... xfce4-volumed
georg 1622 F.... pulseaudio
/dev/snd/controlC29: georg 1607 F.... xfce4-volumed
CRDA: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xfc620000 irq 50'
Mixer name : 'Conexant CX20561 (Hermosa)'
Components : 'HDA:14f15051,17aa211c,00100000 HDA:14f12c06,17aa2122,00100000'
Controls : 31
Simple ctrls : 14
Card29.Amixer.info:
Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7VHT16WW-1.06'
Mixer name : 'ThinkPad EC 7VHT16WW-1.06'
Components : ''
Controls : 1
Simple ctrls : 1
Card29.Amixer.values:
Simple mixer control 'Console',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
Date: Mon Dec 2 09:25:07 2013
HibernationDevice: RESUME=UUID=d0854b61-5204-4213-98a1-28d75d8935cb
InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.2)
MachineType: LENOVO 2768WJ2
MarkForUpload: True
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=de_DE.UTF-8
SHELL=/bin/zsh
ProcFB:
0 radeondrmfb
1 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-32-generic root=/dev/mapper/ubuntu-root ro
RelatedPackageVersions:
linux-restricted-modules-3.8.0-32-generic N/A
linux-backports-modules-3.8.0-32-generic N/A
linux-firmware 1.79.7
SourcePackage: linux-lts-raring
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/15/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 7UET93WW (3.23 )
dmi.board.name: 2768WJ2
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr7UET93WW(3.23):bd12/15/2011:svnLENOVO:pn2768WJ2:pvrThinkPadT400:rvnLENOVO:rn2768WJ2:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2768WJ2
dmi.product.version: ThinkPad T400
dmi.sys.vendor: LENOVO
Struggling to get a kernel crash dump as described here:
https:/
Configuration done as described, but
echo c > /proc/sysrq-trigger
only causes a crash without any dump being captured: system hangs with blinking capslock.
% dmesg |grep crash
[ 0.000000] Command line: BOOT_IMAGE=
[ 0.000000] Reserving 128MB of memory at 720MB for crashkernel (System RAM: 3989MB)
[ 0.000000] Kernel command line: BOOT_IMAGE=
I did '/etc/init.d/kdump start' and sysrq is working as expected. /var/crash is empty. Any Hints?