netdev - Re: [3.4-rc1][Regression][network wireless] 'task xxxx blocked for more than 120 seconds' after resume

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Date:	Thu, 5 Apr 2012 20:37:37 +0200
From:	Maciej Rutecki <maciej.rutecki@...il.com>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	Johannes Berg <johannes@...solutions.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-wireless@...r.kernel.org,
	netdev <netdev@...r.kernel.org>
Subject: Re: [3.4-rc1][Regression][network wireless] 'task xxxx blocked for more than 120 seconds' after resume

On czwartek, 5 kwietnia 2012 o 12:32:54 Stanislaw Gruszka wrote:
> On Tue, Apr 03, 2012 at 10:07:49AM +0200, Johannes Berg wrote:
> > -ilw
> > +netdev
> > 
> > I have no idea what this could be, but I'm almost certain it's not
> > caused by our wireless driver. Looks more like rtl8169 is to blame.
> 
> I'm not sure. Looks like there is deadlock or infinite loop in process
> that holds rtnl lock. This can be wireless driver, wired driver or
> generic network code bug.
> 
> Maciej, please recompile with CONFIG_LOCKDEP and check if it will not
> find any deadlock. If not, when problem will happen please do

Did you mean "CONFIG_LOCKDEP_SUPPORT"?

$ cat /boot/config-3.4.0-rc1 | grep CONFIG_LOCKDEP
CONFIG_LOCKDEP_SUPPORT=y

> 
> echo w > /proc/sysrq-trigger
> dmesg -c > dmesg1.txt

http://mrutecki.pl/download/kernel/3.4-rc1/netdev_resume/dmesg1.txt

> echo t > /proc/sysrq-trigger
> dmesg > dmesg2.txt

http://mrutecki.pl/download/kernel/3.4-rc1/netdev_resume/dmesg2.txt

> 
> and provide those files.
> 
> Additionally there are also lot in dmesg:
> 
>  netlink: 140 bytes leftover after parsing attributes.
> 
> This need to be investigated as well. Perhaps you could modify error
> message, to show what netlink messages/attributes are processed.
> 
> Thanks
> Stanislaw

BTW. From tomorrow till Tuesday I'll be on vacation, so until then I could 
respond to the e-mails.

Regards
-- 
Maciej Rutecki
http://www.mrutecki.pl
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