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Bug #6882

closed

bsnmpd uses all available CPU with hostres module active in some cases

Added by Jim Pingle about 8 years ago. Updated about 7 years ago.

Status:
Resolved
Priority:
Very High
Assignee:
Renato Botelho
Category:
SNMP
Target version:
2.4.1
Start date:
10/31/2016
Due date:
% Done:

100%

Estimated time:
Plus Target Version:
Release Notes:
Affected Version:
2.4
Affected Architecture:

Description

Running 2.4, bsnmpd will consume all available CPU time when the hostres module is active. The CPU usage for geom also rises:

52822 root        96    0 95984K 46028K RUN      0:43  84.77% /usr/sbin/bsnmpd -c /var/etc/snmpd.conf -p /var/run/snmpd.pid
   14 root        -8    -     0K    48K -        1:22  12.30% [geom{g_event}]

Disable the host resources module and both return to near-zero CPU usage.

Affected: pfSense 2.4 on ESXi 6
Unaffected: pfSense 2.4 on SG-8860

Small bit of output from truss while it was consuming high CPU:

86964: openat(AT_FDCWD,"/dev/da0",O_NONBLOCK,00) = 18 (0x12)
86964: ioctl(18,0x40086481 { IOR 0x64('d'), 129, 8 },0xffffbe08) = 0 (0x0)
86964: __sysctl(0x7fffffffbcf0,0x2,0x7fffffffbd44,0x7fffffffbd30,0x802ca61ca,0x11) = 0 (0x0)
86964: __sysctl(0x7fffffffbd44,0x3,0x0,0x7fffffffbd38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbd44,0x3,0x801ae1840,0x7fffffffbd38,0x0,0x0) = 0 (0x0)
86964: getpid()                     = 86964 (0x153b4)
86964: close(18)                 = 0 (0x0)
86964: openat(AT_FDCWD,"/dev/cd0",O_NONBLOCK,00) = 18 (0x12)
86964: ioctl(18,0x40086481 { IOR 0x64('d'), 129, 8 },0xffffbe08) ERR#2 'No such file or directory'
86964: close(18)                 = 0 (0x0)
86964: select(15,{ 3 5 6 8 10 14 },{ },{ },{ 0.755153 }) = 1 (0x1)
86964: read(14,"!system=CAM subsystem=periph typ"...,512) = 176 (0xb0)
86964: __sysctl(0x7fffffffbce0,0x2,0x7fffffffbd30,0x7fffffffbd28,0x8028765f6,0xb) = 0 (0x0)
86964: __sysctl(0x7fffffffbd30,0x3,0x7fffffffbe28,0x7fffffffbe20,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbed8,0x2,0x7fffffffbe40,0x7fffffffc060,0x802876650,0xe) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
86964: __sysctl(0x7fffffffbe40,0x5,0x7fffffffbee0,0x7fffffffbe38,0x0,0x0) = 0 (0x0)
[that repeats over and over]

It appears to be tied to the presence of a CD drive in the VM. If a CD drive is present, connected or not, bsnmpd misbehaves. Removing the CD drive from the VM allows the hostres module to be used.

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