kernel-packages team mailing list archive

[Rafael David Tinoco <rafael.tinoco@xxxxxxxxxxxxx>]

Okay, so after reading all the bug I have the following summary:

"""
1. The current trusty repository bcmwl-kernel-source 6.30.223.141+bdcom-0ubuntu2 is used on my wife's laptop. This system is not experiencing null pointer crashes OR Scan_results errors. This evidence strongly suggests both problems were introduced with 6.30.223.248+bdcom-0ubuntu1.
"""

We have a problem introduced in between:

bcmwl-kernel-source | 6.30.223.141+bdcom-0ubuntu2

and

bcmwl-kernel-source | 6.30.223.248+bdcom-0ubuntu0.1
bcmwl-kernel-source | 6.30.223.248+bdcom-0ubuntu2
bcmwl-kernel-source | 6.30.223.248+bdcom-0ubuntu4

"""
2. On checking syslog carefully, the Scan_results errors are often associated with the system running slowly and "[TTM] Out of kernel memory" messages being logged.

https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1415880/comments/15

I'm now on vivid (via do-release-upgrade -d), The problem reappears
without the patch. I am now reapplying the patch and see if it works
out. On vivid, with the patch, I still get the warning, but the
connection doesn't drop (at least for now, fingers crossed).

this patch fixes kernel crashes with kernels >=3.18 for me on BCM43228.
I'm currently using it on top of vivids bcmwl-kernel-source: 6.30.223.248+bdcom-0ubuntu2 and the vivid 3.19.0 kernel
"""

It looks like the patch fixes the out of memory problem.

"""
-kernel 3.18.9-031809-generic.
-patch applied.

Much better now. However, crashes still occur:e.g.
-sudo rmmod wl cfg80211
-sudo modprobe wl > results in a crash.

workaround:
-sudo modprobe cfg80211
wait for abount 10 seconds
-sudo modprobe wl
"""

But still there is a minor problem with "suspension".

"""
Just to add confirmation that I was seeing the kernel panics on a Dell XPS 13 Developer Edition after upgrading to 15.04 (BIOS A04), and after applying Jesse/PierreF's patch, suspend/resume is now working fine.

The patch from #27 appears to have fixed the kernel panics on suspend for me as well on my Dell XPS 13 Developer Edition (2015 edition) with Ubuntu 15.04 and BIOS A04. Have not seen a panic in five days while before I could not go more than one day without it.
"""

I'll be providing a PPA with the fix and asking for feedback. If the
suspend problems still occur we will continue from there. Expect a PPA
provided here soon. BTW, I'll provide fixes for Trusty & Vivid only
since Utopic is not supported anymore.

Thank you

Rafael Tinoco
SEG Team

-- 
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Packages, which is subscribed to bcmwl in Ubuntu.
https://bugs.launchpad.net/bugs/1415880

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

Status in Dell Sputnik:
  Confirmed
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
  #1379524.

  Adding the patch is a fairly simple process:

  * put the patch file in /usr/src/bcmwl-6.30.223.248+bdcom/patches
  * add the following line to  /usr/src/bcmwl-6.30.223.248+bdcom/dkms.conf
  PATCH[7]="0014-null-pointer-crash.patch"
  * run: /usr/lib/dkms/common.postinst bcmwl 6.30.223.248+bdcom /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 6.30.223.248+bdcom-0ubuntu1 [modified: usr/src/bcmwl-6.30.223.248+bdcom/dkms.conf]
  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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