Panic with nve

Using the 6.0-CURRENT June 2nd Snapshot, I get a panic pretty quickly 
when using an original NForce 1 MCP Network Card(new nve driver).  This 
has happened while I was running sysinstall via pxeboot, and starting a 
ftp install.  This is what I copied from the screen, omitting some 
things later in the stack trace:

anic: nve_ifstart: attempted use of a free mbuf!
cpuid = 0
KBD: enter: panic
[thread pid 35 tid 100022 ]
Stopped at      kdb_enter+0x2b
db>trace
kdb_enter(x0855c9c) at kdb_enter 0x2b
panic(c082ad05,c08154dc,c1a388fc,c1a38800,ce7ebc80) at panic+0x127
nve_ifstart(c1a38800,) at nve_ifstart+0x366
if_start(c1a38800) at if_start+0x7b
ether_output_frame(c1a38800,v1b35300,0,0,0) at ether_output_frame+0x1d9
ether_output(c1a38800,v1b35300,,c1ab67d0,c1ba8c60,v1b58b00) at 
ether_output+0x384
ip_output()
tcp_output()
ip_input()
netisr_processqueue()
swi_net(0)
....

I don't have the gear locally to setup a serial console, so I am hoping 
this is enough to give someone a clue.  It looks easy to reproduce, and 
I am happy to provide more information if needed.

I did find a mention of a similar panic back in October of 2004, but it 
was for the fxp driver:
http://lists.freebsd.org/pipermail/freebsd-net/2004-October/005222.html

Thanks,

-Paul Querna