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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1482892

Title:
  Kernel PANIC often when turning WiFi off

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  When opening lots of network connections and disconnecting from WiFi I
  get two light blinkning (CAPS LOCK light and the one to it's right) -
  assuming kernel PANIC.

  [As Google Chrome opens a lot of tabs, when starting, I've used the
  trick of disconnecting WiFi for a while (and sometimes killing Chrome
  processes, but not this time I believe, but it shouldn't matter), to
  get it to avoid OOM.]

  This is not the first time I've gotten a kernel PANIC this way or the
  only kernel (may be a few versions back). I assume this is a bug in
  the kernel (also), but also in (proprietary) wl:

  lsmod |grep wl
  wl                   6369280  0 
  cfg80211              540672  1 wl

  syslog:

  Aug  8 16:59:18 Ryksugan dnsmasq[826]: setting upstream servers from DBus
  Aug  8 16:59:18 Ryksugan whoopsie[680]: [16:59:18] Cannot reach: https://daisy.ubuntu.com
  Aug  8 16:59:18 Ryksugan kernel: [ 2554.480178] cfg80211: World regulatory domain updated:
  Aug  8 16:59:18 Ryksugan kernel: [ 2554.480184] cfg80211:  DFS Master region: unset
  Aug  8 16:59:18 Ryksugan kernel: [ 2554.480186] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
  Aug  8 16:59:18 Ryksugan kernel: [ 2554.480190] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  Aug  8 16:59:18 Ryksugan kernel: [ 2554.480192] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  Aug  8 16:59:18 Ryksugan kernel: [ 2554.480195] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
  Aug  8 16:59:18 Ryksugan kernel: [ 2554.480197] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  Aug  8 16:59:18 Ryksugan kernel: [ 2554.480200] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  Aug  8 16:59:18 Ryksugan NetworkManager[737]: <info> NetworkManager state is now DISCONNECTED
  Aug  8 16:59:18 Ryksugan NetworkManager[737]: <warn> Connection disconnected (reason -3)
  Aug  8 16:59:18 Ryksugan wpa_supplicant[792]: wlan0: CTRL-EVENT-SCAN-STARTED
  Aug  8 16:59:18 Ryksugan dbus[745]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
  Aug  8 16:59:18 Ryksugan NetworkManager[737]: <info> (wlan0): supplicant interface state: completed -> disconnected
  Aug  8 16:59:18 Ryksugan systemd[1]: Starting Network Manager Script Dispatcher Service...
  Aug  8 16:59:18 Ryksugan dbus[745]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
  Aug  8 16:59:18 Ryksugan systemd[1]: Started Network Manager Script Dispatcher Service.
  Aug  8 16:59:18 Ryksugan nm-dispatcher: Dispatching action 'down' for wlan0
  ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Aug  8 17:04:47 Ryksugan rsyslogd: [origin software="rsyslogd" swVersion="7.4.4" x-pid="686" x-info="http://www.rsyslog.com";] start
  Aug  8 17:04:47 Ryksugan rsyslogd: rsyslogd's groupid changed to 104

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-26-generic 3.19.0-26.27
  ProcVersionSignature: Ubuntu 3.19.0-26.27-generic 3.19.8-ckt4
  Uname: Linux 3.19.0-26-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.17.2-0ubuntu1.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  palli      1645 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Aug  8 17:10:24 2015
  HibernationDevice: RESUME=UUID=8bc9eb31-5629-4dc3-b989-1223eaf31529
  InstallationDate: Installed on 2014-08-21 (351 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Inspiron 1525
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-26-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-26-generic N/A
   linux-backports-modules-3.19.0-26-generic  N/A
   linux-firmware                             1.143
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-04-06 (124 days ago)
  dmi.bios.date: 10/27/2009
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A17
  dmi.board.name: 0U990C
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA17:bd10/27/2009:svnDellInc.:pnInspiron1525:pvr:rvnDellInc.:rn0U990C:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Inspiron 1525
  dmi.sys.vendor: Dell Inc.

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