Under full logging level, the log file size can grow very fast. Under common Linux installations the size limit for a file is 2 Gigabytes. When the log file attains that size, CE will get locked.
To deal with this situation you can have the log be automatically rotated with Linux's logrotate utility.
Setting this up is dead-simple. Create a file called "clientexec", located under /etc/logrotate.d/ with the following contents:
# Logrotate file for ClientExec
create 0666 nobody nobody