On Fri, 7 Jul 2006 07:37:52 -0700 [EMAIL PROTECTED] wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=6802 > > Summary: pktgen cause kernel oops with transmit load balanced > bonding > Kernel Version: 2.4.32, 2.6.17.2 > Status: NEW > Severity: high > Owner: [EMAIL PROTECTED] > Submitter: [EMAIL PROTECTED] > > > Most recent kernel where this bug did not occur: > not found > Distribution: > Fedora Core 4 > > Hardware Environment: > i386, ppc > > Software Environment: > gcc > > Problem Description: > If running the kernel packet generator (pktgen), and the output device is set > to bonding interface with mode balance-tlb or balance-alb, then there will be > kernel oops. > > I only set the odev, dst and count (as 0 for infinite test) for the pktgen. I > wonder if I made mistake for the pktgen parameters but it doesn't cause > problem > if the odev set to physical device such as eth0, etc. > > My investigations shows that the problem happen when the bond_alb_xmit tries > to > access the daddr fields of IP header in skb->nh.iph. If I did the same in > round- > robin mode, it can generate oops too. > > Steps to reproduce: > 1. Build kernel with pktgen (CONFIG_NET_PKTGEN) and bonding driver > (CONFIG_BONDING). > 2. Setup bonding interface. > ifenslave bond0 eth0 > 3. Create a script for starting packet generator, > the script I start packet generator for kernel 2.4 series is like following: > -----------cut here -------- > #! /bin/sh > > modprobe pktgen > > PGDEV=/proc/net/pktgen/pg0 > > function pgset() { > local result > > echo $1 > $PGDEV > > result=`cat $PGDEV | fgrep "Result: OK:"` > if [ "$result" = "" ]; then > cat $PGDEV | fgrep Result: > fi > } > > function pg() { > echo inject > $PGDEV > cat $PGDEV > } > > pgset "odev bond0" > pgset "dst 127.1.16.1" > pgset "count 0" > pg > -----------cut here -------- > > 4. If the odev is set to eth0, the this script will not have problem, problem > only happen when it is set to bond0. >
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