netdev - Re: Mass udp flow reboot linux with RealTek RTL-8169 Gigabit

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Date:	Sun, 13 Feb 2011 08:17:50 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Seblu <seblu@...lu.net>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Francois Romieu <romieu@...zoreil.com>,
	Ivan Vecera <ivecera@...hat.com>
Subject: Re: Mass udp flow reboot linux with RealTek RTL-8169 Gigabit

Le dimanche 13 février 2011 à 02:35 +0100, Seblu a écrit :
> Hi,
> 

CC netdev

> Some days ago, one of my computer poweroff without any warning during
> a long rsync. Every time i run this long rsync, my computer power off
> after a random time.
> Firstly i suspected a  heat stroke. But it resisted all my heat tests
> (cpuburn,ffmpeg,etc).
> Secondly i suposed a power issue. But after some tests, it does not
> seem to be kind of problem.
> Thirdly, i trying to load disk by a lot of read. But system is stable.
> 
> Which is not practical, is that there is no message or trace in logs
> file. And why power off? BIOS is configured to restart after a
> powerloss.
> 
> So, maybe a network issue? From one another 1Gbit/s wired linux
> computer i tryed an udp iperf at full speed (got ~950mbps) and after
> some time, host reboot. o0
> I tryed again, and host reboot again. I tryed with "ping -s 65000 -f"
> and my host reboot again. I've tryed this with a 2.6.32 (debian
> squeeze) and a 2.6.37 (debian experimental) kernel, in both case
> host reboot.
> 
> This doesn't explain why my host power off when rsync, but it seems to
> have a big issue with kernel driver r8169.
> 
> After starting my flood ping or udp iperf, dmesg show a lot of line:
> [  254.896055] r8169 0000:04:00.0: eth0: link up
> [  254.919976] r8169 0000:04:00.0: eth0: link up
> [  254.943916] r8169 0000:04:00.0: eth0: link up
> [  254.983784] r8169 0000:04:00.0: eth0: link up
> [  255.007710] r8169 0000:04:00.0: eth0: link up
> [  255.031657] r8169 0000:04:00.0: eth0: link up
> [  255.103444] r8169 0000:04:00.0: eth0: link up
> 
> Reboot is curious because it doesnt look like a kernel panic and print
> there is no kernel trace.
> 
> My OS is a debian squeeze amd64. My hardware is a intel core i3 +
> gigabyte H55N-UBS3 with 4G DDR3.
> 
> Do you need more trace / test? Do you think power off and reboot is linked?
> 

r8169 driver is known to trigger a reset in case of RX overflow (but a
NIC reset should not power off the machine)

Some attempts were done to avoid a reset on some chipsets.

You could try latest linux-2.6 tree. This includes commits 

f60ac8e7ab7cbb413a0131d5665b053f9f386526 (r8169: prevent RxFIFO induced
loops in the irq handler.)

1519e57fe81c14bb8fa4855579f19264d1ef63b4 (r8169: RxFIFO overflow
oddities with 8168 chipsets.)

b5ba6d12bdac21bc0620a5089e0f24e362645efd (r8169: use RxFIFO overflow
workaround for 8168c chipset.)





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