Bug 236886 - NOHZ: local_softirq_pending 08 with rt2xxx wifi
NOHZ: local_softirq_pending 08 with rt2xxx wifi
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: John W. Linville
Brian Brock
Depends On:
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Reported: 2007-04-18 05:13 EDT by Dan Horák
Modified: 2007-11-30 17:12 EST (History)
5 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2007-06-01 13:16:07 EDT
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RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
laptop dmesg (22.87 KB, text/plain)
2007-05-01 07:47 EDT, François Kooman
no flags Details

  None (edit)
Description Dan Horák 2007-04-18 05:13:46 EDT
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):

How reproducible:

Steps to Reproduce:
1. attach to a wireless network, so the link is up, IP is assigned
Comment 1 Dan Horák 2007-04-20 10:58:49 EDT
behaviour still the same in kernel-2.6.20-1.3094.fc7
Comment 2 John W. Linville 2007-04-24 14:12:31 EDT
Definitely need someone more familiar w/ the driver to take a glance at 
Comment 3 Ivo van Doorn 2007-04-24 14:23:17 EDT
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 04:37:03 EDT
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
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 06:58:54 EDT
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 07:47:50 EDT
Created attachment 153853 [details]
laptop dmesg
Comment 7 François Kooman 2007-05-01 07:49:43 EDT
System profile:

[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
                    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

[root@tritanium ~]# 

See also https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=238537
Comment 8 Dan Horák 2007-05-02 09:53:39 EDT
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 12:06:41 EDT
kernel-2.6.21-1.3194.fc7 looks good

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