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[Jussi Saarinen <1144322@xxxxxxxxxxxxxxxxxx>]

I managed to find one more bug report similar to this one. So now there
are at least four bug reports (including this one) here in Launchpad on
this problem:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1144322

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1165433

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1189998

https://bugs.launchpad.net/ubuntu/+source/linux-lts-raring/+bug/1256811

Anyway, if these are about the same bug that I think they are, the bug
has now been completely fixed in kernel version 3.14, though kernel
version 3.12 included some of the fix. Also there was one previous fix
that is also needed that I think was backported to stable before 3.12.

I think I manged to list all the necessary commits, Here are links to
the commits, in case they need to be backported:

The first fix (pre 3.12?):
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1d9e689c934bd5ecb0f273c6c65e0655c5cfee5f

The fixes in 3.12:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=396dc223dd36edd218650d042a07c5e61f022c5b

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ebe937f74b8a72cf3ceeae5c2194a160bb092901

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54b926a1434e817ca84cb090f36b56763e192470

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cad348a17e170451ea8688b532a6ca3e98c63b60

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ece3150dea382c7c961fe2604332ed3474960d25

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ffe6b68cc5999a3f91a15b6667e69e14186e337d

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=29cd718beba999bda4bdbbf59b5a4d25c07e1547

And finally the fixes in 3.14:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5b899241874dcc1a2b932a668731c80a3a869575

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e228b63390536f5b737056059a9a04ea016b1abf

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4a2fb3ecc7467c775b154813861f25a0ddc11aa0

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f86772af6a0f643d3e13eb3f4f9213ae0c333ee4

-- 
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https://bugs.launchpad.net/bugs/1144322

Title:
  [Toshiba Satellite A80] Kernel 3.8.x Panic when disconnecting from
  network manager via ppp0

Status in “linux” package in Ubuntu:
  Incomplete
Status in Arch Linux:
  Fix Released
Status in Gentoo Linux:
  Fix Released

Bug description:
  Using: "Ubuntu 12.04 (precise) 32-bit" Machine: Laptop / old Toshiba / Celeron processor
  Installing Kernel from: "http://kernel.ubuntu.com/~kernel-ppa/mainline/";

  Apport disabled and uninstalled, so can't provide debug/log details
  (this to make the machine run a bit faster, have been doing so since
  10.04). Have no problem with Kernel upto 3.7.10 (have been upgrading
  to Kernel 3.5/3.6/3.7/3.8, when ever new builds are available) But
  when using Kernel 3.8.0/3.8.1/3.8.2, get Kernel Panic & machine
  crashes & freezes, have to hard boot.

  Machine connects to net using "ppp0" (modem on phone), then if you
  disconnect  the modem "ppp0" & try to reconnect, the Kernel Panics &
  crashes, or then if you disconnect by unchecking "Enable Networking" &
  then rechecking "Enable Networking", the Kernel Panics & crashes.

  First faced this problem with Kernel 3.8.0 so went back to using
  3.7.9, then same story repeated with Kernel 3.8.1 & 3.8.2, currently
  using Kernel 3.7.10. Think there is some REGRESSION in Kernel 3.8

  below details are provided using "HardInfo 0.5.1" :
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1144322/+attachment/3761201/+files/hardinfo
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1880 F.... pulseaudio
   /dev/snd/seq:        timidity   1424 F.... timidity
  Card0.Amixer.info:
   Card hw:0 'ICH6'/'Intel ICH6 with ALC250 at irq 17'
     Mixer name	: 'Realtek ALC250 rev 2'
     Components	: 'AC97a:414c4752'
     Controls      : 33
     Simple ctrls  : 21
  DistroRelease: Ubuntu 12.04
  MachineType: TOSHIBA Satellite A80
  MarkForUpload: True
  Package: linux (not installed)
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-51-generic-pae root=UUID=4dda5c0a-3583-45f5-b6c4-b5aef19935c8 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.2.0-51.77-generic-pae 3.2.48
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory /home/ubuntu not ours.
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-51-generic-pae N/A
   linux-backports-modules-3.2.0-51-generic-pae  N/A
   linux-firmware                                1.79.6
  Tags:  precise
  Uname: Linux 3.2.0-51-generic-pae i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  dmi.bios.date: 10/25/2006
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: V2.80
  dmi.board.name: EAT10/EAT20
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Null
  dmi.chassis.asset.tag: *
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnTOSHIBA:bvrV2.80:bd10/25/2006:svnTOSHIBA:pnSatelliteA80:pvrPSA80L-043003:rvnTOSHIBA:rnEAT10/EAT20:rvrNull:cvnTOSHIBA:ct10:cvrN/A:
  dmi.product.name: Satellite A80
  dmi.product.version: PSA80L-043003
  dmi.sys.vendor: TOSHIBA

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