Comment # 34 on bug 1209457 from St���phane DESNEUX

I took a look at comment #4. I think the non-regression test could be as simple
as sharing a directory, trying to list your own shares, and finally try to
mount your own share (so everything on the same host).

Obviously, this won't happen in the real life, but I think it could fail too as
I suspect that the problem doesn't come from low-level side (whether you're
mounting your own share or not won't interfere)

I'm able to run this without any problem on kernel .46.1 and everything works:
# mkdir /tmp/foo
# exportfs -o ro *:/tmp/foo
# showmount -e localhost
# mkdir /tmp/bar
# mount -t nfs localhost:/tmp/foo /tmp/bar
# echo 123 >/tmp/foo/testme
# ls -l /tmp/bar/
# cat /tmp/bar/testme
123

Try the same with kernel .55 (or .49): it may fail and you'd have your test
ready (with maybe a few timeouts handling...because mount or showmount would
block)

HTH
St���phane