Bug ID 513498: MCP may crash while performing a very large chunked query and CPU is highly loaded

Last Modified: Mar 12, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
11.4.1, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9

Fixed In:
12.0.0, 11.4.1 HF10

Opened: Mar 19, 2015
Severity: 3-Major
Related AskF5 Article:


MCP crashes while performing a chunked query (such as 'tmsh show sys connection) that returns a large result if a connection to a TMM is severed (due to a zero-window timeout).


Failover (in a device cluster) or temporary outage (in a standalone system). A core file is generated that has a stack trace that includes a message similar to the following: error reading variable: Cannot access memory at address 0x1.


-- CPU is highly loaded. -- BIG-IP version is v11.4.1 HF9, which includes an incomplete fix for ID 507853 for this issue.



Fix Information

Ensured that MCP no longer crashes when performing a large chunked query and a connection to a TMM is severed. Provides a complete implementation of the fix for ID 507853 on BIG-IP v11.4.1 HF10 and later.

Behavior Change