servidor de email travando constantemente

Pessoal, mandei um email notificando q meu servidor sempre estava travando!
bem, o erro q da no servidor eh essa frase a baixo, e o codigo abaixo eh a linha 655, porem nao sei o pq deste erro e consequentemente o travamento do servidor
alguem tem ideia do q seja?

Oct 19 13:17:01 mail X-Qmail-Scanner-BWNet-1.24-st-qms: [mail112973387677017075] clamdscan: corrupt or unknown clamd scanner error or memory/resource/perms problem - exit status 9/0

Oct 19 13:17:58 mail X-Qmail-Scanner-BWNet-1.24-st-qms: [mail112973393077017445] clamdscan: corrupt or unknown clamd scanner error or memory/resource/perms problem - exit status 12800/50

Oct 19 13:30:54 mail X-Qmail-Scanner-BWNet-1.24-st-qms: [mail112973388177017127] Requeuing: Maximum time exceeded. Something cannot handle this message. at /var/qmail/bin/qmail-scanner-queue.pl line 655.

//o trecho abaixo eh a uma parte do codigo q contem a linha 655
&working_copy;

# st: working_copy is quite heavy, let see the elapsed time from start
{linha 655} my $elapsed_1=tv_interval ($start_time, [gettimeofday]);
&minidebug("w_c: elapsed time from start $elapsed_1 secs");

#Now alarm this area so that hung networks/virus scanners don't cause
#double-delivery...

eval {
$SIG{ALRM} = sub { die "Maximum time exceeded. Something cannot handle this message." };
alarm $MAXTIME;

&deconstruct_msg; #JLH if (!$quarantine_event);

desde ja agradeco, Daniel GR.