Bug 14278

Summary:	New message "NOHZ: local_softirq_pending 08" at each ping request
Product:	Networking	Reporter:	Christian Casteyde (casteyde.christian)
Component:	Wireless	Assignee:	networking_wireless (networking_wireless)
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	rjw
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.32-rc1	Subsystem:
Regression:	Yes	Bisected commit-id:
Bug Depends on:
Bug Blocks:	14230
Attachments:	fix mac80211 process context issues

Description Christian Casteyde 2009-09-30 18:12:21 UTC

Hardware: Athlon 64 3000 in 64 bits mode (Acer Aspire 1511Lmi laptop)
Distro: Bluewhite64

Since 2.6.32-rc1, with main debug options, I get the following message in dmesg log each time a ping request is issued:

ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
CPUFREQ: Per core ondemand sysfs interface is deprecated - up_threshold
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
etc.

The command issue is:
ping www.google.fr

and the message stops as soon as I kill ping.

The problem may come from the network driver. For information, the connection is established by WPA Wifi with the b43 driver:
b43 ssb0:0: firmware: requesting b43/ucode5.fw
b43 ssb0:0: firmware: requesting b43/pcm5.fw
b43 ssb0:0: firmware: requesting b43/b0g0initvals5.fw
b43 ssb0:0: firmware: requesting b43/b0g0bsinitvals5.fw
b43-phy0: Loading firmware version 410.2160 (2007-05-26 15:32:10)

Comment 1 Michael Buesch 2009-10-01 13:56:28 UTC

Created attachment 23220 [details]
fix mac80211 process context issues

The fix is on its way upstream

Comment 2 Rafael J. Wysocki 2009-10-01 20:38:12 UTC

I don't see this in the Linus' tree at the moment, so only RESOLVED for now.

Comment 3 Rafael J. Wysocki 2009-10-01 20:38:56 UTC

Handled-By : Michael Buesch <mb@bu3sch.de>
Patch : http://bugzilla.kernel.org/attachment.cgi?id=23220

Comment 4 Rafael J. Wysocki 2009-10-11 22:00:39 UTC

Notify-Also : "John W. Linville" <linville@tuxdriver.com>

Comment 5 Rafael J. Wysocki 2009-10-13 20:47:01 UTC

Ignore-Patch : http://bugzilla.kernel.org/attachment.cgi?id=23220
Not-Handled-By : Michael Buesch <mb@bu3sch.de>

Handled-By : Johannes Berg <johannes@sipsolutions.net>
Patch : http://patchwork.kernel.org/patch/52997/

Comment 6 Rafael J. Wysocki 2009-10-26 18:29:07 UTC

Fixed by commit edbfdcceb41c0cbfc1dd2cd28af2272190be47ad .