Hey,

Running current as of yesterday (userland and kernel) and transferring between 
two xen3 domus, the NFS server tips over with the below:

db> bt
cpu_Debugger(c03eddd8,caedb6e8,caedb6dc,c036d704,0) at netbsd:cpu_Debugger+0x4
panic(c0412fc8,c03dc6a4,c03e54f5,c03e5470,24c) at netbsd:panic+0x155
__assert(c03dc6a4,c03e5470,24c,c03e54f5,c0650660) at netbsd:__assert+0x2e
ubc_release(ca8c0000,6,caedba88,caedb7ac,0) at netbsd:ubc_release+0x2a2
ubc_uiomove(cb5a9840,caedba88,4000,6,0) at netbsd:ubc_uiomove+0xf9
ffs_write(caedb8e8,30000,c0877600,100,136) at netbsd:ffs_write+0x920
VOP_WRITE(cb5a9840,caedba88,80,cb095544,caeb2940) at netbsd:VOP_WRITE+0x31
nfsrv_write(cb1e4d5c,c076f400,caeb2940,caedbb24,3) at netbsd:nfsrv_write+0x92d
nfssvc_nfsd(caedbb74,804a2e0,caeb2940,0,0) at netbsd:nfssvc_nfsd+0x183
sys_nfssvc(caeb2940,caedbc48,caedbc68,bbb06234,bbb06000) at 
netbsd:sys_nfssvc+0x
308
syscall_plain() at netbsd:syscall_plain+0xb9
--- syscall (number 155) ---
0xbbb0623b:
db> 

Let me know if there is anything else I can provide.

Sarton