[Bug 217983] Collaboration bsnmpd + devd + using an empty CD-ROM drive = 100% CPU load

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217983

            Bug ID: 217983
           Summary: Collaboration bsnmpd + devd + using an empty CD-ROM
                    drive = 100% CPU load
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: admin at support.od.ua

Collaboration bsnmpd + devd + using an empty CD-ROM drive = 100% CPU load

The service dedv restart command helps to solve the problem.

FreeBSD 11.0-STABLE #0 r314635: Sat Mar  4 02:12:23 EET 2017
The problem is relevant, from about May 2016 on to FreeBSD 10.3-STABLE.

# top -bPS -n 10
last pid:  2660;  load averages:  1.48,  0.93,  0.44  up 0+00:05:21    19:41:16
70 processes:  5 running, 64 sleeping, 1 waiting

Mem: 622M Active, 13M Inact, 183M Wired, 1153M Free
ARC: 88M Total, 30M MFU, 55M MRU, 16K Anon, 491K Header, 2526K Other
Swap: 6144M Total, 6144M Free


  PID USERNAME    THR PRI NICE   SIZE    RES STATE    TIME    WCPU COMMAND
 2623 root          1  52    0 94176K 43176K RUN      1:40  56.49% bsnmpd
   14 root          3  -8    -     0K    48K -        0:52  29.69% geom
   12 root         25 -64    -     0K   400K WAIT     0:26  11.38% intr
 1038 root          1  22    0  9532K  4800K select   0:08   3.76% devd
  891 root          1  21    0 10480K  1892K select   0:04   1.95% syslogd
   11 root          1 155 ki31     0K    16K RUN      1:46   0.00% idle
 1553 mysql        24  52    0   763M   525M select   0:02   0.00% mysqld
    0 root        274 -16    -     0K  4384K swapin   0:02   0.00% kernel
    4 root          2 -16    -     0K    32K -        0:01   0.00% cam
   31 root          1 -16    -     0K    16K -        0:00   0.00% racctd

# egrep -v '^#|^$' /etc/snmpd.config
location := "Room 200"
contact := "sysmeister at example.com"
system := 1     # FreeBSD
read := "lkagh;rhstghhjd"
NoAuthProtocol          := 1.3.6.1.6.3.10.1.1.1
HMACMD5AuthProtocol     := 1.3.6.1.6.3.10.1.1.2
HMACSHAAuthProtocol     := 1.3.6.1.6.3.10.1.1.3
NoPrivProtocol          := 1.3.6.1.6.3.10.1.2.1
DESPrivProtocol         := 1.3.6.1.6.3.10.1.2.2
AesCfb128Protocol       := 1.3.6.1.6.3.10.1.2.4
securityModelAny        := 0
securityModelSNMPv1     := 1
securityModelSNMPv2c    := 2
securityModelUSM        := 3
MPmodelSNMPv1           := 0
MPmodelSNMPv2c          := 1
MPmodelSNMPv3           := 3
noAuthNoPriv := 1
authNoPriv := 2
authPriv := 3
%snmpd
begemotSnmpdDebugDumpPdus       = 2
begemotSnmpdDebugSyslogPri      = 7
begemotSnmpdCommunityString.0.1 = $(read)
begemotSnmpdCommunityDisable    = 1
begemotSnmpdPortStatus.0.0.0.0.161 = 1
begemotSnmpdLocalPortStatus."/var/run/snmpd.sock" = 1
begemotSnmpdLocalPortType."/var/run/snmpd.sock" = 4
sysContact      = $(contact)
sysLocation     = $(location)
sysObjectId     = 1.3.6.1.4.1.12325.1.1.2.1.$(system)
snmpEnableAuthenTraps = 2
begemotSnmpdModulePath."mibII"  = "/usr/lib/snmp_mibII.so"
begemotSnmpdModulePath."bridge" = "/usr/lib/snmp_bridge.so"
begemotSnmpdModulePath."hostres" = "/usr/lib/snmp_hostres.so"
begemotSnmpdModulePath."lm75" = "/usr/lib/snmp_lm75.so"
begemotSnmpdModulePath."netgraph" = "/usr/lib/snmp_netgraph.so"
begemotSnmpdModulePath."pf"     = "/usr/lib/snmp_pf.so"
%mibII
begemotIfForcePoll = 2000
%netgraph
begemotNgControlNodeName = "snmpd"
begemotSnmpdModulePath."ucd" = "/usr/local/lib/snmp_ucd.so"
%ucd
updateInterval = 500
extCheckInterval = 100
extUpdateInterval = 3000
extTimeout = 60
memMinimumSwap = 1600
memSwapErrorMsg = "No free swap!"

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