Panic in vkernel with NFS as root mount

[Rumko <rumcic@xxxxxxxxx>]

After applying the patch from issue1192, NFS can be used as a root mount, but
not long after another panic occurs, just after start_init it seems.
Just before the KKASERT in sys/vfs/nfs/nfs_bio.c on line 1608 I
added 'kprintf("%d %d\n", tsiz, nmp->nm_rsize);' and got the following output:
Using memory file: /var/vkernel/memimg.000000
KVM mapped at 0x40000000-0x80000000
Locking CPU0 to real cpu 1
TAP UNIT 0
Copyright (c) 2003-2009 The DragonFly Project.
Copyright (c) 1992-2003 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
Slab ZoneSize set to 64KB
Leaving critical section, allowing interrupts
DragonFly v2.5.0.57.g6028d-DEVELOPMENT #51: Thu Oct  1 09:43:49 CEST 2009
    root@zeus.rumko.net:/usr/obj/usr/src/sys/MYVKERNEL
real memory = 134217728 (131072K bytes)
avail memory = 127180800 (124200K bytes)
Locking CPU1 to real cpu 1
DragonFly/MP: Multiprocessor
 cpu0 (BSP)
 cpu1 (AP)
initclocks
Finish MP startup
SMP: AP CPU #1 Launched!
Active CPU Mask: 00000003
objcache(exec-args): too small for ncpus, adjusting cluster_limit 16->32
start scheduler helpers on cpus: 0 1
start dummy scheduler helpers on cpus: 0 1
vkd0: type 0xa5, start 32, end = 20971519, size 20971488 : OK
vkd1: type 0xa5, start 32, end = 4194303, size 4194272 : OK
vke0: bpf attached
vke0: MAC address: 00:be:0e:1d:00:00
fildesc_drvinit() building stdin, stdout, stderr:
md0: Malloc disk
Device configuration finished.
lo0: bpf attached
ip: MPSAFE
arp: MPSAFE
PXE: Warning, no NFS handle passed from loader
Mounting root from nfs:
nfs_mountroot: interface vke0 ip 192.168.250.235 bcast 192.168.250.255 mask
255.255.255.0
NFS_ROOT: 192.168.250.1:/var/vkernel/vkernel_root
NFS_ROOT: No FH passed from loader, attempting mount rpc...success!
Mounting devfs
start_init: trying /sbin/init
16384 8192
panic: assertion: tsiz <= nmp->nm_rsize in nfs_readrpc_bio
mp_lock = 00000001; cpuid = 1
Trace beginning at frame 0x58019d08
panic(58019d2c,548cfc00,4000,580f3a00,58019d44) at 0x80a4b8a
panic(81cfc82,81e8430,81e85df,508c0428,508c0428) at 0x80a4b8a
nfs_readrpc_bio(5773f490,508c0494,549a8a18,508c0494,548cfc00) at 0x814d449
nfs_startio(5773f490,508c0494,0,5773f490,414003cc) at 0x814e7ce
nfssvc_iod_writer(548cfc00,0,0,0,0) at 0x8166165
-- 
Regards,
Rumko