Bug 236886

Summary: NOHZ: local_softirq_pending 08 with rt2xxx wifi
Product: [Fedora] Fedora Reporter: Dan Horák <dan>
Component: kernelAssignee: John W. Linville <linville>
Status: CLOSED RAWHIDE QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: cebbert, davej, fkooman, ivdoorn, mwallis
Target Milestone: ---   
Target Release: ---   
Hardware: i686   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2007-06-01 17:16:07 UTC Type: ---
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
laptop dmesg none

Description Dan Horák 2007-04-18 09:13:46 UTC 
Description of problem:
when a Ralink 2561 based WiFi PCI card (Edimax) is UP, then a lot of "NOHZ:
local_softirq_pending 08" messages are written to console

00:0f.0 Network controller: RaLink RT2561/RT61 802.11g PCI
or with lspci -n
00:0f.0 0280: 1814:0301

Version-Release number of selected component (if applicable):
kernel-2.6.20-1.3079.fc7

How reproducible:
always


Steps to Reproduce:
1. attach to a wireless network, so the link is up, IP is assigned
Comment 1 Dan Horák 2007-04-20 14:58:49 UTC 
behaviour still the same in kernel-2.6.20-1.3094.fc7
Comment 2 John W. Linville 2007-04-24 18:12:31 UTC 
Definitely need someone more familiar w/ the driver to take a glance at 
this...
Comment 3 Ivo van Doorn 2007-04-24 18:23:17 UTC 
Could you enable debugging output of the rt61pci driver (load rt61pci with the 
debug=1 option) and attach /var/log/messsages to this bugreport?
Comment 4 François Kooman 2007-05-01 08:37:03 UTC 
Same problem here with the rt2500pci driver (PC-card):

wlan0: Initial auth_alg=0
wlan0: authenticate with AP 00:14:bf:a5:05:78
wlan0: RX authentication from 00:14:bf:a5:05:78 (alg=0 transaction=2 status=0)
wlan0: authenticated
wlan0: associate with AP 00:14:bf:a5:05:78
wlan0: RX AssocResp from 00:14:bf:a5:05:78 (capab=0x411 status=0 aid=1)
wlan0: associated
NOHZ: local_softirq_pending 08
..
..

Trying to load driver with debug=1:

[root@tritanium log]# modprobe rt2500pci debug=1
FATAL: Error inserting rt2500pci
(/lib/modules/2.6.21-1.3116.fc7/kernel/drivers/net/wireless/mac80211/rt2x00/rt2500pci.ko):
Unknown symbol in module, or unknown parameter (see dmesg)
[root@tritanium log]# dmesg | tail -1
rt2500pci: Unknown parameter `debug'
[root@tritanium log]#
Comment 5 Ivo van Doorn 2007-05-01 10:58:54 UTC 
ok, so debug isn't enabled in the fedora default config.
Could you post the entire output of dmesg then, perhaps it still contains 
something useful.
Comment 6 François Kooman 2007-05-01 11:47:50 UTC 
Created attachment 153853 [details]
laptop dmesg
Comment 7 François Kooman 2007-05-01 11:49:43 UTC 
System profile:
http://smolt.fedoraproject.org/show?UUID=7249536a-feda-40cf-8407-917fbc02aa9a

[root@tritanium ~]# iwlist wlan0 scan
Warning: Driver for device wlan0 has been compiled with version 22
of Wireless Extension, while this program supports up to version 20.
Some things may be broken...

wlan0     Scan completed :
          Cell 01 - Address: 00:14:BF:A5:05:78
                    ESSID:"brmstrt"
                    Mode:Master
                    Frequency:2.462 GHz
                    Signal level=-175 dBm  Noise level=-176 dBm
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s
                    Extra:tsf=0000000c1dcf297d

[root@tritanium ~]# 

See also https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=238537
Comment 8 Dan Horák 2007-05-02 13:53:39 UTC 
I am rebuilding the Fedora kernel with debugging enabled, then I will upload it
at http://fedora.danny.cz/kernel
Comment 9 Dan Horák 2007-05-28 16:06:41 UTC 
kernel-2.6.21-1.3194.fc7 looks good