Autoreconf in unfs3 mount hangs

Binary package hint: unfs3

Source package: unfs3
Package version: 0.9.22+dfsg-1
Architecture: i386
Uname: Linux 2.6.31-6-generic i386
Distro version: Ubuntu 9.10

Trying to run autoreconf for an autotools project in a directory mounted via unfs3 always hangs in autom4te execution. The exported directory is itself on an encryptfs mount (encrypted home directory configured in Ubuntu installer). The export is mounted on a VirtualBox VM running Karmic netbook remix. The same project will successfully be bootstrapped if autoreconf is run in the exported directory, not the nfs mount.

A test project is attached.

How to reproduce:
1) Extract attached tarball to a directory on an encryptfs mount (encrypted home directory configured in Ubuntu installer)
2) Export resultant directory via unfs3
3) Mount said export in a VirtualBox VM running Karmic netbook remix
4) Run "autoreconf -v -d -i"

Expected results:
- Autoreconf completes successfully

Actual results:
- Autoreconf hangs after this output:
aclocal: running autom4te --language Autoconf-without-aclocal-m4 --trace='AC_DEFUN:$f::$n::$1' --trace='AC_DEFUN_ONCE:$f::$n::$1' --trace='AU_DEFUN:$f::$n::$1' --trace='_AM_AUTOCONF_VERSION:$f::$n::$1' configure.ac