Bug ID 739272: Incorrect zombie counts in PBA stats with long PBA block-lifetimes

Last Modified: May 29, 2024

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

Known Affected Versions:
12.1.0, 12.1.1, 12.1.2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,,, 13.1.1,,,, 14.0.0,,,,,, 14.0.1,

Fixed In:

Opened: Aug 04, 2018

Severity: 3-Major


Due to a truncation error, a long Port Block Allocation (PBA) block lifetime can cause the PBA zombie stats to get incremented before the block lifetime expires and even though a zombie block has not been created.


This bug affects only the 'Active Zombie Port Blocks', 'Total Zombie Port Blocks Created', and 'Total Zombie Port Blocks Deleted' counters. It does not convert active blocks to zombie blocks before the block lifetime expires.


Large Scale NAT (LSN) pool or Firewall NAT source-translation with a Port Block Allocation Block Lifetime greater than 65535.


There is no workaround.

Fix Information

The 'Active Zombie Port Blocks', 'Total Zombie Port Blocks Created' counters are now incremented only when the PBA block lifetime expires.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips