netdev - Re: [Bugme-new] [Bug 14794] New: IP address assigned by DHCP is dropped after ~40 seconds

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Date:	Thu, 17 Dec 2009 21:53:20 +0100
From:	Németh Márton <nm127@...email.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
CC:	netdev@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [Bugme-new] [Bug 14794] New: IP address assigned by DHCP is dropped
 after ~40 seconds

Hi,

I bisected the problem, see http://bugzilla.kernel.org/show_bug.cgi?id=14794
for details. Any idea what is the relation between this problem and the found
patch?

Regards,

	Márton Németh

Andrew Morton wrote:
> (switched to email.  Please respond via emailed reply-to-all, not via the
> bugzilla web interface).
> 
> A 2.6.31 -> 2.6.32 regression.
> 
> On Sun, 13 Dec 2009 08:59:48 GMT
> bugzilla-daemon@...zilla.kernel.org wrote:
> 
>> http://bugzilla.kernel.org/show_bug.cgi?id=14794
>>
>>            Summary: IP address assigned by DHCP is dropped after ~40
>>                     seconds
>>            Product: Networking
>>            Version: 2.5
>>     Kernel Version: 2.6.32
>>           Platform: All
>>         OS/Version: Linux
>>               Tree: Mainline
>>             Status: NEW
>>           Severity: normal
>>           Priority: P1
>>          Component: IPV4
>>         AssignedTo: shemminger@...ux-foundation.org
>>         ReportedBy: nm127@...email.hu
>>         Regression: Yes
>>
>>
>> Created an attachment (id=24165)
>>  --> (http://bugzilla.kernel.org/attachment.cgi?id=24165)
>> Wireshark log while acquiring IP address
>>
>> The IP address which was assigned by DHCP is dropped and the address
>> 169.254.123.251 is set. This happens on Clevo D4J model D410J with 2.6.32, but
>> works correctly with 2.6.31.
>>
>> Steps to reproduce:
>> 1. Boot the system
>> 2. In an xterm window execute the following command to see the actual IP
>> address settings:
>>    while true; do clear; date; /sbin/ifconfig; sleep 1; done
>> 3. Unplug the network cable for some seconds: the IP address should be gone
>> 4. Plug the network cable.
>> 5. After about 10 seconds the IP address 192.168.1.64 assigned by DHCP is
>> visible
>> 6. After about 50 seconds (counting from the plug of the network cable) no IP
>> address is assigned
>> 7. After about 65 seconds (counting from the plug of the network cable) the IP
>> address 169.254.123.251 is assigned. This IP address will not work on this
>> network.
>>
>> I run Wireshark during the whole process, see the attached log file.
>> Packet 25..28: DHCP address is fetched.
>> Packet 63: DHCP release: this should not happen
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