On Fri, Oct 8, 2010 at 12:44 PM, Josef Moellers <
[email protected]> wrote:
> Am 8.10.2010 schrub Bart Van Assche:
>
> > On Fri, Oct 8, 2010 at 11:50 AM, Josef Moellers
> > <[email protected] <mailto:[email protected]>>
> > wrote:
> >
> > We've run into a classical deadlock situation:
> >
> > An agentx subagent tries to send a reply message to the snmpd agent,
> but
> > its socket is full, so it hangs in send(). The snmpd has timed out
> and
> > is trying to resend the request. The socket in this direction is
> full,
> > too. Apparently the situation has occurred because the subagent has
> been
> > busy without responding to snmpd request which have come in in quite
> > great numbers.
> >
> > So now both, snmpd and our subagent, are both waiting in
> send/sendto()
> > without being able to read from their side of the socket.
> >
> > This may be a very rare situation, but it seems that it is not
> > impossible.
> >
> > Is there an official way to resolve this situation?
> >
> >
> > With which Net-SNMP version did this occur ?
>
> Version 5.4.2.1, part of SLES11-SP1
>
Are you using Unix sockets (the default) or TCP/IP for communication between
the master agent and the subagent ? I'm asking this because - at least if I
interpret the Net-SNMP 5.4 source code correctly - communication over Unix
sockets is blocking and communication over TCP/IP sockets is not. If you are
using Unix sockets, does switching to TCP/IP help ? You will have to add
something like the following in snmpd.conf:
agentXSocket tcp:localhost:705
Bart.
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