linux-kernel - unregister_netdevice: waiting for ppp0 to become free

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Message-ID: <20090514090241.GA32546@phare.normalesup.org>
Date:	Thu, 14 May 2009 11:02:41 +0200
From:	Nicolas George <nicolas.george@...malesup.org>
To:	linux-kernel@...r.kernel.org
Subject: unregister_netdevice: waiting for ppp0 to become free

Hi.

I recently upgraded to 2.6.29.1, and since then I get the following message
when my DSL ISP disconnects me (which he does weekly):

unregister_netdevice: waiting for ppp0 to become free. Usage count = 7

I did not manage to get the network up again without rebooting.

PPP is working with kernel-level PPPoE. The only slightly unusual thing in
my configuration is a few QoS rules. The same configuration worked fine with
kernel 2.6.24.2. I do not see anything relevant in the ChangeLog for
2.6.29.2 and 2.6.29.3.

Killing pppd does not seem to trigger the problem. I did not try to unplug
the DSL modem yet.

I attach the SysRq-t log.

I hope someone can help me find the problem.

Regards,

-- 
  Nicolas George

Download attachment "unregister_netdevice-backtrace.txt.gz" of type "application/x-gunzip" (6494 bytes)