We recently use ClamAV on our mail servers (Linux Slamd64 12.0.0).
Even though clamd seems to be catching viruses, we are getting a lot of 
"Input/Output" errors on all our mail servers:

Mar 20 11:09:33 dillinger sm-mta[23292]: n2KF9Ahj023292: 
from=<us...@concordia.ca>, size=1093213, class=0, nrcpts=1, 
msgid=<messageID>, proto=ESMTP, daemon=MTA, relay=relayserver
Mar 20 11:09:33 dillinger mimedefang.pl[19707]: n2KF9Ahj023292: Clamd 
returned error: Input/Output error
Mar 20 11:09:33 dillinger mimedefang.pl[19707]: n2KF9Ahj023292: clamd 
error: code=999, category=swerr, action=tempfail
Mar 20 11:09:33 dillinger mimedefang.pl[19707]: filter: n2KF9Ahj023292: 
tempfail=1
Mar 20 11:09:33 dillinger mimedefang[18284]: n2KF9Ahj023292: Tempfailing 
because filter instructed us to
Mar 20 11:09:33 dillinger sm-mta[23292]: n2KF9Ahj023292: Milter: data, 
reject=451 4.3.0 error: problem running ClamAV virus scanner
Mar 20 11:09:33 dillinger sm-mta[23292]: n2KF9Ahj023292: 
to=<us...@concordia.ca>, delay=00:00:02, pri=1123213, stat=error: problem 
running ClamAV virus scanner

(I have redacted the value of "from", "to", "msgid" and "relay")


We are not sure why the category=swerr. Would "Input/Output" occur
because of our "Max" sizes are not big enough? (df shows we are nowhere
more than 60% usage.) From the log, it looks like all those mail messages
are not being relayed at all :-( .

Any help would be very much appreciated.

Tan

==============================

Linux Slamd64 12.0.0


# clamd --version
ClamAV 0.94.2/9144/Fri Mar 20 06:51:14 2009


Our clamd.conf file:

PidFile /local/var/spam/clamd.pid
DatabaseDirectory /local/pkg/clamav/root-clamav-0.94.2/share/clamav
LocalSocket /local/var/spam/clamd.sock
FixStaleSocket yes
MaxConnectionQueueLength 30
StreamMaxLength 50M
MaxThreads 20
ReadTimeout 300
MaxDirectoryRecursion 15
SelfCheck 1800
User amavis
DetectPUA yes
AlgorithmicDetection yes
ScanPE yes
ScanELF yes
DetectBrokenExecutables yes
ScanOLE2 yes
ScanPDF yes
ScanMail yes
PhishingSignatures yes
PhishingScanURLs yes
ScanHTML yes
ScanArchive yes
MaxScanSize 100M
MaxFileSize 50M
MaxRecursion 16
MaxFiles 10000


freshclam is fine; databases have been updated successfully.

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