netdev - Re: r8169: instant crash if receiving packet larger than MTU

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Message-ID: <499B2437.90400@msgid.tls.msk.ru>
Date:	Tue, 17 Feb 2009 23:55:19 +0300
From:	Michael Tokarev <mjt@....msk.ru>
To:	Francois Romieu <romieu@...zoreil.com>
CC:	netdev <netdev@...r.kernel.org>
Subject: Re: r8169: instant crash if receiving packet larger than MTU

Francois Romieu wrote:
> Michael Tokarev <mjt@....msk.ru> :
>> I played with jumbo frames today at home on two
>> machines with built-in r8169 NICs.  And discovered
>> that, after enabling larger packets on one machine,
>> it's sufficient to send SINGLE packet to immediately,
>> instantly crash the other machine.
> 
> Which size did you use and how did it crash (dead keyboard leds
> without any message in the console ?) ?

Original interface MTU was unchanged from the default 1500 bytes.
The packet I sent was of size 8000 bytes.

The crash - one of the machines in question was completely dead,
nothing on the console, and dead keyboard leds.  Another with the
same chip rebooted instantly.

/mjt

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