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Cisco Bug: CSCvu78125 - Cat9300 : Gi0/0 Mgmt Interface flap leads to Memory leak in 'sif_mgr' process

Last Modified

Jul 29, 2020

Products (1)

  • Cisco Catalyst 9300 Series Switches

Known Affected Releases

16.11.1 Gibraltar-16.11.1

Description (partial)

Symptom:
Below logs is continuously observed:

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to down
%LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to up
%HMANRP-6-EMP_NO_ELECTION_INFO: Could not elect active EMP switch, setting emp active switch to 0: EMP_RELAY: Could not elect switch with mgmt port UP
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up
%LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to down
%LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to up
%HMANRP-6-EMP_NO_ELECTION_INFO: Could not elect active EMP switch, setting emp active switch to 0: EMP_RELAY: Could not elect switch with mgmt port UP

In the output of 'show processes memory platform sorted', RSS filed of 'sif_mgr' process keeps increasing.

Cat9300#show processes memory platform sorted
System memory: 7711304K total, 5202124K used, 2509180K free,
Lowest: 2503168K
   Pid    Text      Data   Stack   Dynamic       RSS              Name
----------------------------------------------------------------------
10126     281   2179188     136   2126024   2179188           sif_mgr    <<<
  9932  151604    815144     136       408    815144   linux_iosd-imag

Cat9300#show processes memory platform sorted
System memory: 7711304K total, 5200104K used, 2511200K free,
Lowest: 2509216K
   Pid    Text      Data   Stack   Dynamic       RSS              Name
----------------------------------------------------------------------
10185     281   2182432     136   2128984   2182432           sif_mgr   <<<
  9910  151604    813440     136       408    813440   linux_iosd-imag

The memory leak if left unchecked, crashes the switch.

Conditions:
Gi0/0 port flap is triggered after removing and adding 'ip address dhcp' config for this interface.
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