Date: Wed, 21 Dec 2016 15:07:04 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@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-215471-8@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 You are receiving this mail because: You are the assignee for the bug.=
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