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[Bug 1415880] Re: 14e4:4365 bcmwl-kernel source: fix for null pointer crash


I have null pointer exception on a XPS 13 (9343) which trigger a kernel
panic when I suspend the laptop. I can reproduce the issue nearly all
times (3 / 4 tries), for this I need to generate network traffic
(looking a video on Internet seem to be enough).

After applying the patch mentioned above, I not longer have such kernel
panic (done 6 tries without any kernel panic). So that patch seems to
solve my kernel panic issue when suspending laptop.

I will attach the debdiff I used to apply the patch.

Without the patch (with bcmwl-kernel-source
0ubuntu2), I could product a kernel panic by doing:

* Have network "load" (watching video on internet, downloading something, ...)
* Suspend the laptop. On my test I did it with "systemctl suspend" from tty1 to capture the Call trace.

System information:

* Hardware : Dell XPS 13 (9343)
* Ubuntu 15.04 amd64
* Bios A03 03/25/2015
* bcmwl-kernel-source  (so wifi is using module wl)
* lspci : 02:00.0 Network controller: Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter (rev 03)

I will also attach picture of the screen after a crash + partial
transcript the of kernel panic (see picture for the full information).

** Patch added: "Patch to fix suspend kernel panic"

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  14e4:4365 bcmwl-kernel source: fix for null pointer crash

Status in bcmwl package in Ubuntu:
  In Progress

Bug description:
  The bcmwl package as of now misses one patch for a bug that occurs
  with BCM43142 and possibly other broadcom chipsets that will look like
  random disconnects, poor wifi signal and kernel warnings, See also

  Adding the patch is a fairly simple process:

  * put the patch file in /usr/src/bcmwl-
  * add the following line to  /usr/src/bcmwl-
  * run: /usr/lib/dkms/common.postinst bcmwl /usr/share/bcmwl x86_64 $(uname -r)

  This has fixed the issue for me. Edit: I just wanted to add that I did
  not write the patch; I merely downloaded it from a paste that was
  linked from the respective AUR package.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: bcmwl-kernel-source [modified: usr/src/bcmwl-]
  ProcVersionSignature: Ubuntu 3.16.0-29.39-generic 3.16.7-ckt2
  Uname: Linux 3.16.0-29-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.7-0ubuntu8.1
  Architecture: amd64
  CurrentDesktop: LXDE
  Date: Thu Jan 29 13:15:17 2015
  InstallationDate: Installed on 2015-01-26 (3 days ago)
  InstallationMedia: Lubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  SourcePackage: bcmwl
  UpgradeStatus: No upgrade log present (probably fresh install)

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