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Created attachment 1398517 [details]
Solution patch

Description of problem:
Despite non-zero interface_fadeout, interface is deleted immediately if ifLastChange is more than interface_fadeout ago.

Version-Release number of selected component (if applicable):
net-snmp-libs-5.7.2-28.el7.x86_64
net-snmp-5.7.2-28.el7.x86_64
net-snmp-agent-libs-5.7.2-28.el7.x86_64
net-snmp-utils-5.7.2-28.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Set interface_fadeout 60 in snmpd.conf ; restart snmpd.
2. Add dummy1 interface to the system:
$ ip link add dummy1 type dummy
3. Query list of interfaces via snmp. Make sure that dummy1 interface is present in snmpd output
$ snmptable -v 2c -c public localhost ifTable
4. Wait for more than 60 seconds (interface_fadeout time)
5. Deleted dummy1 interface from the system:
$ ip link del dummy1
6. Query list of interfaces via snmp.
$ snmptable -v 2c -c public localhost ifTable

Actual results:
dummy1 interface disappears from snmpd output immediately after it is deleted from the system despite non-zero interface_fadeout

Expected results:
dummy1 interface will be present in snmpd output within interface_fadeout seconds after the deletion

Additional info:
Solution patch attached

Commit: http://pkgs.devel.redhat.com/cgit/rpms/net-snmp/commit/?id=c649a00b1d1d3c4ddf6b0aeaf0c9b180aa34cdf0

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:1081