Bug ID 1081473: GTM/DNS installations may observe the mcpd process crashing

Last Modified: May 16, 2024

Affected Product(s):
BIG-IP DNS(all modules)

Known Affected Versions:
14.1.4, 14.1.4.1, 14.1.4.2, 14.1.4.3, 14.1.4.4, 14.1.4.5, 14.1.4.6, 14.1.5, 14.1.5.1, 14.1.5.2, 14.1.5.3, 14.1.5.4, 14.1.5.6, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3

Fixed In:
17.1.1

Opened: Feb 16, 2022

Severity: 2-Critical

Symptoms

1) The mcpd process may crash, potentially leading to failover/momentary traffic disruption while system components restart 2) Log entries refering to the 'iqsyncer' module similar to the following may be observed prior to the crash notice mcpd[32268]: 01070751:5: start_transaction received without previous end_transaction - connection 0x62773308 (user %iqsyncer) notice mcpd[6269]: 010714a0:5: Sync of device group /Common/gtm to commit id 17072 7051583675817774674 /Common/abcd.xyz 0 from device %iqsyncer complete. notice mcpd[6269]: 01070418:5: connection 0x64c0c008 (user %iqsyncer) was closed with active requests 3) Log entries similar to the following may be observed indicating failure and restart in the mcpd component: err icr_eventd[11664]: 01a10003:3: Receive MCP msg failed: Can't recv, status: 0x1020046 warning snmpd[8096]: 010e0004:4: MCPD query response exceeding 270 seconds. err icr_eventd[11664]: 01a10003:3: Receive MCP msg failed: Can't recv, status: 0x1020046 notice sod[9497]: 01140041:5: Killing /usr/bin/mcpd pid 12325. warning sod[9497]: 01140029:4: high availability (HA) daemon_heartbeat mcpd fails action is restart. crit tmsh[31348]: 01420001:2: The connection to mcpd has been lost, try again. : framework/RemoteMcpConn.cpp, line 74 crit tmsh[31434]: 01420001:2: The connection to mcpd has been lost, try again. : framework/RemoteMcpConn.cpp, line 74 info sod[9497]: 010c0009:6: Lost connection to mcpd - reestablishing. err mysqlhad[17260]: 014e0006:3: MCP Failure: 1.

Impact

Traffic disrupted while mcpd restarts.

Conditions

DNS/GTM installation with syncgroup members actively exchanging configuration items. The issue happens rarely unless a lot of configuration changes occur on one of the syncgroup members, which needs to be carried over.

Workaround

None

Fix Information

iqsyncer module fixed to process large volume of traffic correctly now

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips