netdev - [forcedeth bug] Re: [GIT] Networking

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Date:	Thu, 4 Aug 2011 23:53:54 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Miller <davem@...emloft.net>, Jiri Pirko <jpirko@...hat.com>
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [forcedeth bug] Re: [GIT] Networking

* Ingo Molnar <mingo@...e.hu> wrote:

>  0891b0e08937: forcedeth: fix vlans

Hm, forcedeth is still giving me trouble even on latest -git that has 
the above fix included.

The symptom is a stuck interface, no packets in. There's a frame 
error RX packet:

 [root@...cury ~]# ifconfig eth0
 eth0      Link encap:Ethernet  HWaddr 00:13:D4:DC:41:12  
           inet addr:10.0.1.13  Bcast:10.0.1.255  Mask:255.255.255.0
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:0 errors:1 dropped:0 overruns:0 frame:1
           TX packets:531 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000 
           RX bytes:0 (0.0 b)  TX bytes:34112 (33.3 KiB)
           Interrupt:35 

Weirdly enough a defconfig x86 bootup works just fine - it's certain 
.config combinations that trigger the bug. I've attached such a 
config.

Note that at least once i've observed a seemingly good kernel going 
'bad' after a couple of minutes uptime. I've also observed 
intermittent behavior - apparent lost packets and a laggy network.

I have done 3 failed attempts to bisect it any further - i got to the 
commit that got fixed by:

  0891b0e08937: forcedeth: fix vlans

... but that's something we already knew.

Let me know if there's any data i can provide to help debug this 
problem.

Thanks,

	Ingo

View attachment "config" of type "text/plain" (61847 bytes)