Martin, I'm not wireless expert but, after reading a bit and analysing your syslog output:
---- Aug 20 12:57:16 martin04 kernel: [ 9464.423445] Call Trace: Aug 20 12:57:16 martin04 kernel: [ 9464.423451] [<ffffffff817aeed7>] dump_stack+0x45/0x57 Aug 20 12:57:16 martin04 kernel: [ 9464.423453] [<ffffffff81074d8a>] warn_slowpath_common+0x8a/0xc0 Aug 20 12:57:16 martin04 kernel: [ 9464.423455] [<ffffffff81074e7a>] warn_slowpath_null+0x1a/0x20 Aug 20 12:57:16 martin04 kernel: [ 9464.423462] [<ffffffffc04c5e09>] cfg80211_roamed+0x89/0x90 [cfg80211] Aug 20 12:57:16 martin04 kernel: [ 9464.423489] [<ffffffffc07aba0b>] wl_notify_roaming_status+0xcb/0x150 [wl] Aug 20 12:57:16 martin04 kernel: [ 9464.423508] [<ffffffffc07a876a>] wl_event_handler+0x6a/0x230 [wl] Aug 20 12:57:16 martin04 kernel: [ 9464.423526] [<ffffffffc07a8700>] ? wl_free_wdev.isra.23+0x80/0x80 [wl] Aug 20 12:57:16 martin04 kernel: [ 9464.423529] [<ffffffff81093802>] kthread+0xd2/0xf0 Aug 20 12:57:16 martin04 kernel: [ 9464.423531] [<ffffffff81093730>] ? kthread_create_on_node+0x1c0/0x1c0 Aug 20 12:57:16 martin04 kernel: [ 9464.423533] [<ffffffff817b67d8>] ret_from_fork+0x58/0x90 Aug 20 12:57:16 martin04 kernel: [ 9464.423535] [<ffffffff81093730>] ? kthread_create_on_node+0x1c0/0x1c0 ---- This only means that broadcom WL driver tried to warn kernel that it roamed from one AP to another and new BSS could not be found (meaning that the card could not get all its new BSS - peers, APs, etc). *** Try configuring the wireless adapter to use a SPECIFIC AP *** and check your wifi env for interferences that might be stepping into broadcom's driver decisions on whether to roam or not -> This does not mean a fix for WL is not needed, it only means we would have to wait for Broadcom to come up with a new driver. Based on good feedback from Igor I'll suggest fixes for all Ubuntu versions. Even if upstream BW driver still faces problems with adapters, we still have to fix this bug's original problem. I'll attach debdiffs for this bug soon. Alberto, I saw you pushed precise into latest version (right now in -proposed), I'll check if it also needs the fix and provide debdiff. Let me know if you have any other comments since you've been handling all bcmwl work and you are more into it than I am. Thank you Rafael -- You received this bug notification because you are a member of Kernel 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) To manage notifications about this bug go to: https://bugs.launchpad.net/dell-sputnik/+bug/1415880/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
