Date: Thu, 19 Nov 2009 20:43:36 -0500 (EST) From: Jared Mauch <jared@puck.nether.net> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/140712: fxp driver starts with rxcsum on Message-ID: <200911200143.nAK1ha9Z082914@puck.nether.net> Resent-Message-ID: <200911200150.nAK1o1fB013811@freefall.freebsd.org>
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>Number: 140712 >Category: kern >Synopsis: fxp driver starts with rxcsum on >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Nov 20 01:50:01 UTC 2009 >Closed-Date: >Last-Modified: >Originator: Jared Mauch >Release: FreeBSD 8.0-RC3 i386 >Organization: Self >Environment: FreeBSD npd2.nether.net 8.0-RC3 FreeBSD 8.0-RC3 #0: Tue Nov 10 07:50:36 UTC 2009 root@almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386 >Description: Upon upgrading from 7.0-release to 8.0-RC3 the fxp0 interface came with rxcsum enabled, eg: # ifconfig fxp0 fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=9<RXCSUM,VLAN_MTU> ether 00:20:fc:1e:dd:00 inet 61.120.147.50 netmask 0xfffffffc broadcast 61.120.147.51 inet6 fe80::220:fcff:fe1e:dd00%fxp0 prefixlen 64 scopeid 0x1 media: Ethernet 100baseTX <full-duplex> status: active # sysctl -a | grep fxp dev.fxp.0.%desc: Intel 82559ER Embedded 10/100 Ethernet dev.fxp.0.%driver: fxp dev.fxp.0.%location: slot=4 function=0 dev.fxp.0.%pnpinfo: vendor=0x8086 device=0x1209 subvendor=0x102b subdevice=0x6000 class=0x020000 dev.fxp.0.%parent: pci3 dev.fxp.0.int_delay: 1000 dev.fxp.0.bundle_max: 6 dev.fxp.0.rnr: 0 dev.fxp.0.noflow: 1 This caused truncated IP packets/messages to be received by the kernel resulting in the machine being unreachable. # tcpdump -n -i fxp0 -c 3 -s0 fxp0: promiscuous mode enabled tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on fxp0, link-type EN10MB (Ethernet), capture size 65535 bytes 01:52:48.166315 IP truncated-ip - 2 bytes missing! 204.42.254.133 > 61.120.147.50: ICMP echo request, id 33313, seq 5139, length 64 01:52:49.166155 IP truncated-ip - 2 bytes missing! 204.42.254.133 > 61.120.147.50: ICMP echo request, id 33313, seq 5140, length 64 01:52:50.166276 fIP truncated-ip x- 2 bytes missinpg! 204.42.254.1303 > 61.120.147.5:0: ICMP echo req uest, id 33313, pseq 5141, lengthr 64 3 packets coaptured 3 packemts received by fiilter 0 packetss dropped by kerncel uous mode disabled >How-To-Repeat: Reboot the system with this hardware installed/used. >Fix: ifconfig fxp0 -rxcsum >Release-Note: >Audit-Trail: >Unformatted:
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