Is there a good way to detect a stale NFS mount

Question

I have a procedure I want to initiate only if several tests complete successfully.

One test I need is that all of my NFS mounts are alive and well.

Can I do

Answer 1

In addition to previous answers, which hangs under some circumstances, this snippet checks all suitable mounts, kills with signal KILL, and is tested with CIFS too:

grep -v tracefs /proc/mounts | cut -d' ' -f2 | \
  while read m; do \
    timeout --signal=KILL 1 ls -d $m > /dev/null || echo "$m"; \
  done