getcwd failing suddenly

Recently I have started seeing this error when starting the server.

shell-init: could not get current directory: getcwd: cannot access parent directories

Here is the command I use to start PostgreSQL.

su postgres -c "/usr/local/pgsql/bin/postmaster -S -D /usr/local/pgsql/data"

Did something change recently to cause this?  I find I can get around it
by changing the command to the following.

su postgres -c "cd /usr/local/pgsql; /usr/local/pgsql/bin/postmaster -S -D /usr/local/pgsql/data"

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