Bug ID 439709: WAM occasionally serves zero-length content

Last Modified: Apr 28, 2025

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

Known Affected Versions:
11.2.0, 11.2.1

Opened: Dec 04, 2013

Severity: 3-Major

Related Article: K15038

Symptoms

A burst of simultaneous requests for a small expired document can result in incorrectly serving and caching the document as 0 length.

Impact

Content is cached and served as zero length.

Conditions

Requesting a compressed document which is smaller than 4k compressed but larger than 4k when uncompressed.

Workaround

disable small object cache with this command: tmsh modify sys db wam.cache.smallobject.threshold value 0

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips