GENERIC: error receiving data -- Resource temporarily unavailable

[Jesse Guardiani]

Howdy list,

I just started using Monit last Friday. VERY cool little
program. I'm running Monit 4.2 (without HTTP) on:

# uname -a
FreeBSD chortos.wingnet.net 4.8-RELEASE FreeBSD 4.8-RELEASE #0: Fri Apr 11 
12:59:08 EDT 2003     address@hidden:/usr/src/sys/compile/CHORTOS  i386

I am using monit to monitor ClamAV's clamd daemon. It has
a bad habit of:

a.) consuming high resources for no good reason
b.) crashing (which I fix quickly via daemontools)
c.) hanging for no good reason. (This is really what I need monit for.)

Anyway, today I saw this in my log:

--------------------------------------------------------
Apr  5 08:25:37 chortos monit[14259]: GENERIC: error receiving data -- Resource 
temporarily unavailable
Apr  5 08:25:37 chortos monit[14259]: Event: 'clamd' failed protocol test 
[generic] at UNIX[/tmp/clamd].
Apr  5 08:25:37 chortos monit[14259]: Trying to restart 'clamd'
Apr  5 08:25:37 chortos monit[14259]: stop: (clamd) /usr/bin/killall
Apr  5 08:25:38 chortos monit[14259]: start: (clamd) /usr/local/bin/clamdctl
Apr  5 08:25:45 chortos monit[14259]: Sendmail error: 451 qq temporary problem 
(#4.3.0)
Apr  5 08:26:50 chortos monit[14259]: GENERIC: error receiving data -- Resource 
temporarily unavailable
Apr  5 08:27:55 chortos monit[14259]: GENERIC: error receiving data -- Resource 
temporarily unavailable
Apr  5 08:29:00 chortos monit[14259]: GENERIC: error receiving data -- Resource 
temporarily unavailable
Apr  5 08:30:05 chortos monit[14259]: GENERIC: error receiving data -- Resource 
temporarily unavailable
Apr  5 08:31:10 chortos monit[14259]: GENERIC: error receiving data -- Resource 
temporarily unavailable
Apr  5 08:48:31 chortos monit[14259]: GENERIC: error receiving data -- Resource 
temporarily unavailable
Apr  5 08:56:31 chortos monit[14259]: Event: loadavg(1min) of 10.2 matches 
resource limit [loadavg(1min)>10.0]
Apr  5 08:56:31 chortos monit[14259]: Trying to restart 'clamd'
Apr  5 08:56:31 chortos monit[14259]: stop: (clamd) /usr/bin/killall
Apr  5 08:56:32 chortos monit[14259]: start: (clamd) /usr/local/bin/clamdctl
Apr  5 08:56:52 chortos monit[14259]: Sendmail: error receiving data from the 
mailserver 'localhost' -- Resource temporarily unavailable
Apr  5 09:05:58 chortos monit[14259]: GENERIC: error receiving data -- Resource 
temporarily unavailable
Apr  5 09:05:58 chortos monit[14259]: Event: 'clamd' failed protocol test 
[generic] at UNIX[/tmp/clamd].
Apr  5 09:05:58 chortos monit[14259]: Trying to restart 'clamd'
Apr  5 09:05:58 chortos monit[14259]: stop: (clamd) /usr/bin/killall
Apr  5 09:05:59 chortos monit[14259]: start: (clamd) /usr/local/bin/clamdctl
Apr  5 09:06:01 chortos monit[14259]: Sendmail error: 451 qq temporary problem 
(#4.3.0)
--------------------------------------------------------

What does "GENERIC: error receiving data -- Resource temporarily unavailable" 
mean?
And, more importantly, why did that message at 08:26 not trigger a restart 
event?
5 minutes is a long time for a service to be unavailable.


Here's my /etc/monitrc:

--------------------------------------------------------
set daemon 60
set logfile syslog facility log_daemon
set alert address@hidden
set mailserver localhost, agape.wingnet.net, lego.flatratecalling.biz
     with timeout 15 seconds

check process clamd with pidfile /var/spool/qmailscan/clamd.pid
    start program = "/usr/local/bin/clamdctl start"
    stop program  = "/usr/bin/killall -9 clamd"

    if failed unixsocket /tmp/clamd
        send "VERSION\r\n"
        expect "clamd / ClamAV.*"
    then restart

    if memory is greater than 30% then restart
    if loadavg(1min) is greater than 10.0 then restart
    alert address@hidden
--------------------------------------------------------

Thanks!

-- 
Jesse Guardiani, Systems Administrator
WingNET Internet Services,
P.O. Box 2605 // Cleveland, TN 37320-2605
423-559-LINK (v)  423-559-5145 (f)
http://www.wingnet.net