bogus 0 len IP packet, was: Hang in VOP_LOCK1_APV on 8-STABLE with NFS.

[sthaug at nethelp.no]

> > I'm seeing the same problem with Broadcom NetXtreme (bce) cards:
> > 
> > bce0 at pci0:3:0:0:        class=0x020000 card=0x03421014 chip=0x164c14e4 rev=0x12 hdr=0x00
> >     vendor     = 'Broadcom Corporation'
> >     device     = 'Broadcom NetXtreme II Gigabit Ethernet Adapter (BCM5708)'
> >     class      = network
> >     subclass   = ethernet
> > 
> > This is with 8.2-PRERELEASE. Turning off TSO (ifconfig bce0 -tso)
> > removes the problem.
> > 
> 
> Is there a reliable way to trigger this on bce(4)? I don't have
> BCM5708 but I have BCM5709 so I can verify that.

It showed up pretty much immediately when running a csup sessions
against cvsup2.us.freebsd.org.

I have a pcap file from the session, if you're interested.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no