No space left on device: mod_rewrite: could not create rewrite_log_lock

If you are getting

No space left on device: mod_rewrite: could not create rewrite_log_lock

error while restarting Apache then do this to fix it (replace Apache with the name of the

user apache runs as):

ipcs -s | grep apache | perl -e while () { @a=split(/s+/); print `ipcrm sem $a[1]`}