Bug 702694

Summary: iwl3945 ad-hoc mode -> kernel crash
Product: [Fedora] Fedora Reporter: Christian Jann <christian.jann>
Component: kernelAssignee: Stanislaw Gruszka <sgruszka>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 15CC: gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda, sgruszka
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: kernel-2.6.38.7-28.rc1.fc15 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-06-15 10:57:35 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Attachments:
Description Flags
screenshot from the crash, backtrace without debuginfo none

Description Christian Jann 2011-05-06 15:50:12 UTC 
Description of problem:

Just installed Fedora 15 Final TC1 on a second hdd:
kernel crash and no working wireless connection

Version-Release number of selected component (if applicable):

uname -r
2.6.38.4-20.fc15.x86_64


How reproducible:
every time

Steps to Reproduce:

[tux@localhost ~]$ su -c "service NetworkManager stop"
Password: 
Stopping NetworkManager (via systemctl):                   [  OK  ]
[tux@localhost ~]$ su -
Password: 
[root@localhost ~]# ifconfig wlan0 up
[root@localhost ~]# iwconfig wlan0 mode ad-hoc
[root@localhost ~]# iwconfig wlan0 essid some_network

wait 10 seconds -->crash!

So what should I do?
Comment 1 Christian Jann 2011-05-06 15:55:20 UTC 
Created attachment 497396 [details]
screenshot from the crash, backtrace without debuginfo
Comment 2 Stanislaw Gruszka 2011-05-06 17:07:12 UTC 
Patch is available for that problem (see upstream kernel bug), I'll post it soon. 

You can use hardware scan as workaround:

modprobe -r iwl3945
modprobe iwl3945 disable_hw_scan=0
Comment 3 Stanislaw Gruszka 2011-05-24 14:56:26 UTC 
http://koji.fedoraproject.org/koji/buildinfo?buildID=244715 kernel include fix
for this bug ( http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.38.y.git;a=commit;h=23181925de608dea571fb5aba4a34900df54b973 )
Comment 4 Christian Jann 2011-05-24 21:09:12 UTC 
OK wlan is working again, thanks. I can get an working ad-hoc connection (but not via NetworkManager at the moment).
You first link points to an fc14 kernel, I've installed 2.6.38.7-28.rc1.fc15.x86_64 from http://koji.fedoraproject.org/koji/buildinfo?buildID=244664

bug fixed
Comment 5 Stanislaw Gruszka 2011-05-25 08:06:03 UTC 
(In reply to comment #4)
> OK wlan is working again, thanks. I can get an working ad-hoc connection (but
> not via NetworkManager at the moment).
There is know issue with NetworkManager and nl80211
https://bugzilla.redhat.com/show_bug.cgi?id=699203