Bug ID 459001: Invalid PVA statistics

Last Modified: Feb 13, 2019

Bug Tracker

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

Known Affected Versions:
11.5.0, 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

Fixed In:
11.6.0, 11.5.1 HF5

Opened: Apr 25, 2014
Severity: 3-Major
Related AskF5 Article:
K16346

Symptoms

The PVA statistics reported by TMSH can incorrectly report bits and packets processed counts of about 34 billion and 16 million, respectively. This failure is intermittent.

Impact

Incorrect statistics. Data flow through the BIG-IP is not impacted.

Conditions

There are no specific conditions leading to this problem.

Workaround

None

Fix Information

PVA statistics for each flow are tracked in hardware and software. The software copy of the hardware flow statistics was not correctly reset when flows were evicted from the PVA hardware and then subsequently reloaded back into the hardware. This eventually resulted in a numeric underflow in the statistics counters that were then displayed with very large positive values. This issue is now fixed.

Behavior Change