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[Páll Haraldsson <Pall.Haraldsson@xxxxxxxxx>]

This just happened again, and I believe I was running the latest
(Ubuntu) kernel. No, not the upstream one.. It just seemed too much
work.. and wouldn't prove anything if I can't get Ubuntu to freeze as
that doesn't always happen.. I guess I really should get around to this
as if it would happen again it would at least prove, not fixed upstream.
The cause might however be in bcmwl (or an interaction between it in the
kernel). I think the former here is *it*:

lsmod |grep wl
wl                   6369280  0 
cfg80211              540672  1 wl

Installed files" of bcmwl has no .ko but have files such as a Makefile:

/usr/src/bcmwl-6.30.223.248+bdcom/patches/0015-add-support-for-
Linux-3.18.patch

[then this is a build a .ko, right? Do I need then linux-sources, I
believe I don't and haven't had it installed in the past but I have it
installed now, may have done that at some point, myself.. It hasn't been
updated in a while, is at 3.19.0.17.16. I'm trying to learn thing so I
could maybe be more helful in the future and/or not send bugus report if
this one is it..]


What I'm running now:

uname -a
Linux Ryksugan 3.19.0-27-generic #29-Ubuntu SMP Fri Aug 14 21:43:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux


In case I forgot to restart after last kernel upgrade (I have Ksplice, but ages ago, it seemed to just stop working), then I would have been running /boot/initrd.img-3.19.0-26-generic

Might only have worked pre-Nov 2014. It's just not something I had to do
very often (or decided to try, to turn WiFi off, but it should always be
safe). Possibly this might be even older and I just didn't try to
trigger it.


Very probably this might have to do with this,  (and could very well has started around 3.17/3.18 timeframe):

bcmwl (6.30.223.248+bdcom-0ubuntu2) vivid; urgency=medium

  * debian/dkms.conf.in,
    debian/patches/0014-add-support-for-Linux-3.17.patch,
    debian/patches/0015-add-support-for-Linux-3.18.patch:
    - Add support for Linux 3.17 (LP: #1358966).
      Credit for the patch goes to Brian Norris.
    - Add support for Linux 3.18 (LP: #1358966).
      Credit for the patch goes to Krzysztof Kolasa.

 -- Alberto Milone <alberto.milone@xxxxxxxxxxxxx>  Thu, 06 Nov 2014
18:43:27 +0100

bcmwl (6.30.223.248+bdcom-0ubuntu1) utopic; urgency=medium

  * New upstream release: (LP: #1342645)
    - This is an official public release from Broadcom.
  * debian/dkms.conf.in:
    - Drop patches for kernels 3.10 (now upstream)

 -- Robert Ancell <robert.ancell@xxxxxxxxxxxxx>  Fri, 01 Aug 2014
11:09:43 +1200


ls -lrt /boot/initrd.img-3.1*
-rw-r--r-- 1 root root 19976179 apr 10 17:20 /boot/initrd.img-3.13.0-47-generic *
-rw-r--r-- 1 root root 21782845 apr 19 13:54 /boot/initrd.img-3.19.0-15-generic *
-rw-r--r-- 1 root root 21737800 jún  3 21:54 /boot/initrd.img-3.19.0-20-lowlatency *
-rw-r--r-- 1 root root 21782780 ágú 10 20:31 /boot/initrd.img-3.19.0-26-generic
-rw-r--r-- 1 root root 21788996 ágú 15 18:24 /boot/initrd.img-3.19.0-27-generic

marked with a star those I've not run in ages, just didn't clean up in
case this doesn't resolve on day. The oldest or next oldest, I think
worked at some point(I had more, but had to free space on /boot and
deleted rarely used ones).




** Summary changed:

- Kernel PANIC often when turning WiFi off
+ Kernel PANIC often when turning WiFi off, on current 3.19.0-27-generic (see text, my be one older), happened before on previous kernel, and one or two before that one.

** Summary changed:

- Kernel PANIC often when turning WiFi off, on current 3.19.0-27-generic (see text, my be one older), happened before on previous kernel, and one or two before that one.
+ Kernel PANIC often when turning WiFi off, on current 3.19.0-27-generic (see text, my be one older), happened before on previous kernel, and one or two, probably more, before that one.

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

Title:
  Kernel PANIC often when turning WiFi off, on current 3.19.0-27-generic
  (see text, my be one older), happened before on previous kernel, and
  one or two, probably more, before that one.

Status in linux package in Ubuntu:
  Incomplete

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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