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Date:      Wed, 21 Dec 2016 15:07:04 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-amd64@FreeBSD.org
Subject:   [Bug 215471] Using bsnmpd with the snmp_hostres module on a vmware ESXi guest with a disconnected CD drive uses 100% CPU
Message-ID:  <bug-215471-6@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D215471

            Bug ID: 215471
           Summary: Using bsnmpd with the snmp_hostres module on a vmware
                    ESXi guest with a disconnected CD drive uses 100% CPU
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: jimp@pfsense.org
                CC: freebsd-amd64@FreeBSD.org
                CC: freebsd-amd64@FreeBSD.org

Created attachment 178177
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D178177&action=
=3Dedit
A configuration file for bsnmpd which can reproduce the high CPU usage prob=
lem
on a vmware guest

When running FreeBSD 11.0-RELEASE (from release until at least -p5), there =
is a
combination of factors that leads to bsnmpd using 100% CPU.

It seems to require all of the following:

* FreeBSD 11 running as a guest in VMWare ESXi
* The guest has a "CD/DVD Drive" listed in its hardware on ESX
* The CD/DVD Drive is in a disconnected state
* The snmp_hostres module is loaded in the bsnmpd configuration file
* bsnmpd enabled and running

Here is a very small snmpd.config that can replicate the problem in a simil=
ar
environment:

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
%snmpd
sysDescr                        =3D "FreeBSD doctor.example.com FreeBSD
11.0-RELEASE-p5 amd64"
begemotSnmpdCommunityString.0.1 =3D "supersecret"
begemotSnmpdPortStatus.0.0.0.0.161 =3D 1
begemotSnmpdModulePath."mibII"  =3D "/usr/lib/snmp_mibII.so"
begemotSnmpdModulePath."hostres"     =3D "/usr/lib/snmp_hostres.so"
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

If bsnmpd is run on this guest with that configuration, it consumes all
available CPU.=20

I'll attach the above snmpd.config, along with top output and a sample of t=
he
truss output taken while bsnmpd was running.

Currently the only workaround is to disable the hostres module, but that me=
ans
losing access to any of the information it provides.

--=20
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