Bug ID 442124: Image Optimization Can Cause Cache Incoherency

Last Modified: Apr 28, 2025

Affected Product(s):
BIG-IP AAM, WAM(all modules)

Known Affected Versions:
11.5.0, 11.5.1, 11.5.1 HF1, 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, 11.5.1 HF10, 11.5.1 HF11, 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, 11.5.10, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3

Opened: Jan 03, 2014

Severity: 3-Major

Symptoms

When an image is optimized, the caches in which the original and the optimized versions are stored can be different. In that case, it is possible for one TMM to have a differently encoded version of the same image than another TMM.

Impact

Minor, but some clients might receive the unoptimized image, while others will receive the optimized image.

Conditions

This condition applies on images whose size, after optimization, crosses back or forth across the 4 KB boundary that defines the size discriminator for choosing the cache.

Workaround

Although no workaround is truly needed, image optimization can be disabled.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips