From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Greear Subject: Re: Tulip (DFE-570tx) & keyboard lockup in 2.6.9 and other 2.6 kernels. Date: Thu, 24 Feb 2005 16:16:33 -0800 Message-ID: <421E6E61.3040005@candelatech.com> References: <421CF0BA.1020100@candelatech.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: linux-kernel To: netdev@oss.sgi.com In-Reply-To: <421CF0BA.1020100@candelatech.com> Sender: netdev-bounce@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org Ben Greear wrote: > I finally had some time to debug this one a little more > thoroughly. On two different machines (Shuttle SB61G1) I > get the same results, so I do not believe it is bad hardware... > > The bug is as follows: > > I have 1 4-port tulip NIC in the machine. If I generate traffic > between two interfaces, it runs fine. But, if I start running traffic > on all 4 interfaces, the keyboard quits taking input, and ethernet > traffic stops on at least a few of the interfaces. I can still ssh > into the machine (via the rtl8139 interface), so at least one of the > processors (I'm using SMP on an P4 HT processor) is working. I also > enabled NMI and that does not trigger. This was my bug. I was holding a lock that was required for receiving a packet while calling the hard_start_xmit method. When an IRQ happened while I was in the hard_start_xmit method, the IRQ could not grab the lock, and just sat there spinning... Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com