procmail: Error while writing to "/var/log/procmail"

I'm trying to resolve a problem with procmail.  Consider the following
command sequence:

# whoami
root
# sudo procmail -d jerryb
test
procmail: Error while writing to "/var/log/procmail"

# ls -lt /var/log/procmail
-rw-r--r--  1 root root 4587 Jan 13 06:12 /var/log/procmail

What could be causing this error message and what should I do to get rid of it?

# cat .procmailrc
DEFAULT=/var/mail/$LOGNAME
LOGFILE=$HOME/procmail

# cat /etc/procmailrc
# Use maildir-style mailbox in user's home directory
#DEFAULT=$HOME/.maildir/
# Use mbox-style mailbox in FHS standard directory
DEFAULT=/var/mail/$LOGNAME
LOGFILE=/var/log/procmail
## LOG="
## "
## VERBOSE=yes

#


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