panic doing remote buildworld w/nve

I'm consistently getting a panic doing a buildworld through SSH.   
This is using CURRENT from maybe 10 hours ago (built on the  
console).  For the past few days I've been using the onboard nve  
network card on my nForce(2?) board.  Previously I used a card that  
used the rl driver and I never ran into any problems.  Here's the trace:

cpuid = 0
KDB: enter: panic
[thread pid 721 tid 100076 ]
Stopped at      kdb_enter+0x2b: nop
db> trace
Tracing pid 721 tid 100076 td 0xc2328e10
kdb_enter(c0651992) at kdb_enter+0x2b
panic(c064619d,c0639f38,c23460fc,2,e8cc0114) at panic+0x127
nve_ifstart(c2346000) at nve_ifstart+0x366
if_start(c2346000) at if_start+0x7b
ether_output_frame(c2346000,c25f0b00,0,0,0) at ether_output_frame+0x1d9
ether_output(c2346000,c25f0b00,e8cb5ab4,c26d8c60,c260e200) at  
ether_output+0x370
ip_output(c25f0b00,0,e8cb5ab0,0,0) at ip_output+0x6fc
tcp_output(c26ff000,1,c26fd9d8,0,40) at tcp_output+0xdf8
tcp_usr_send(c26d567c,0,c25f2600,0,0) at tcp_usr_send+0x177
sosend(c26d567c,0,e8cb5c78,c25f2600,0) at sosend+0x5e7
soo_write(c264c4c8,e8cb5c78,c26bba00,0,c2328e10) at soo_write+0x46
dofilewrite(c2328e10,c264c4c8,3,807e000,40) at dofilewrite+0xa8
write(c2328e10,e8cb5d04,3,ca,206) at write+0x39
syscall(3b,3b,3b,bfbfde78,806edc8) at syscall+0x22b
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (4, FreeBSD ELF32, write), eip = 0x282b875b, esp =  
0xbfbfdddc, ebp = 0xbfbfddf8 ---db>


Joel