modular nfsserver hanging from mountd

[Geoff Wing <gcw%pobox.com@localhost>]

With a kernel which autoloads the nfsserver (which autoloads nfs), mountd
hangs during a nfs syscall.  ktrace says:

   112      1 mountd   CALL  nfssvc(0x200,0xbfbfdf30)
   112      1 mountd   NAMI  
"/stand/i386/5.99.3/modules/nfsserver/nfsserver.kmod"
   112      1 mountd   NAMI  "/stand/i386/5.99.3/modules/nfs/nfs.kmod"
   112      1 mountd   RET   nfssvc RESTART
   112      1 mountd   CALL  nfssvc(0x200,0xbfbfdf30)
   112      1 mountd   NAMI  "/"

It hangs in src/sys/nfs/nfs_export.c:init_exports() on
        ne = malloc(sizeof(*ne), M_NFS_EXPORT, M_WAITOK | M_ZERO);

Is the problem obvious to anyone?

Building NFSSERVER into the kernel works properly (still).

Regards,
Geoff