Disman traps not sent when in daemon mode

I've found the same problem like following issue, when snmpd process run in foreground it can send disman traps, but when snmpd run with -p flag it can not send disman traps:
http://sourceforge.net/p/net-snmp/bugs/2455/

Thanks in advance for any help,



Iusse 2455:
I've found an issue with Disman traps.
The OS is Debian 7.0
NET-SNMP version: 5.4.3
The relevant section of the config file is:
________________________________
trap2sink hostname.mydomain.com mycommunity
trapcommunity mycommunity
includeAllDisks 10%
load 50 25 15
createUser internal MD5 "mypassword"
iquerySecName internal
agentSecName internal
rouser internal
defaultMonitors yes
________________________________
Problem:
The snmpd process sends Disman traps when in foreground mode, but not in daemon mode.
How to reproduce:
Create a dummy filesystem and fill it up:
df -h
...
/dev/mapper/sys-traptest 7.8M 7.8M 0 100% /trap
Start the daemon:
/etc/init.d/snmpd start
The process is running like this:
snmp 20370 1 0 16:00 ? 00:00:00 /usr/sbin/snmpd -LS6d -Lf /dev/null -u snmp -g snmp -I -smux -p /var/run/snmpd.pid
Check the status of dskTable:
snmpwalk -v2c -c mycommunity localhost dskTable
(relevant lines shown only)
UCD-SNMP-MIB::dskPercent.13 = INTEGER: 100
UCD-SNMP-MIB::dskErrorFlag.13 = INTEGER: error(1)
UCD-SNMP-MIB::dskErrorMsg.13 = STRING: /trap: less than 10% free (= 100%)
ColdStart trap is received in monitoring station:
Apr 22 15:42:38 hostname snmptrapd[36680]: <UNKNOWN> [UDP: [192.168.126.164]:35505->[0.0.0.0]:0]: Trap , .1.3.6.1.2.1.1.3.0 = Timeticks: (4) 0:00:00.04, .1.3.6.1.6.3.1.1.4.1.0 = OID: .1.3.6.1.6.3.1.1.5.1, .1.3.6.1.6.3.1.1.4.3.0 = OID: .1.3.6.1.4.1.8072.3.2.10
Wait at least 10 minutes, but Disman trap is not received.
Stop the daemon, and run in foreground:
$ snmpd -f
Disman trap is immediately received in monitoring station:
Apr 22 15:43:51 hostname snmptrapd[36680]: <UNKNOWN> [UDP: [192.168.126.164]:35639->[0.0.0.0]:0]: Trap , .1.3.6.1.2.1.1.3.0 = Timeticks: (4) 0:00:00.04, .1.3.6.1.6.3.1.1.4.1.0 = OID: .1.3.6.1.2.1.88.2.0.1, .1.3.6.1.2.1.88.2.1.1.0 = STRING: dskTable, .1.3.6.1.2.1.88.2.1.2.0 = STRING: , .1.3.6.1.2.1.88.2.1.3.0 = STRING: , .1.3.6.1.2.1.88.2.1.4.0 = OID: .1.3.6.1.4.1.2021.9.1.100.13, .1.3.6.1.2.1.88.2.1.5.0 = INTEGER: 1, .1.3.6.1.4.1.2021.9.1.2.13 = STRING: /trap, .1.3.6.1.4.1.2021.9.1.101.13 = STRING: /trap: less than 10% free (= 100%)

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