Bug ID 429890: TMM core when condition HEAD request is made for a negative cache entry

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
11.2.0, 11.3.0

Fixed In:
11.3.0 HF8

Opened: Sep 05, 2013
Severity: 3-Major
Related AskF5 Article:


The Traffic Management Microkernel (TMM) process may produce a core file when the system processes some WebAccelerator requests.


Traffic disrupted while tmm restarts.


Following sequence results in tmm core: 1. Negative cache entry for a GET request is created. 2. 206 response for a partial range GET for the same document as above. 3. If-None-Match conditional HEAD request for the above document.



Fix Information

The fix would involve bypassing 304 Not-Modified code when we have a negative cache entry.

Behavior Change