Bug ID 685254: RAM Cache Exceeding Watchdog Timeout in Header Field Search

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3,,,, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,,, 13.1.1,,

Fixed In:

Opened: Sep 25, 2017
Severity: 2-Critical
Related AskF5 Article:


SOD halts TMM while RAM cache is processing a header.


The search continues until a match is found in memory, or a NUL byte is encountered. If the search takes too long, sod kills RAM cache on a watchdog timeout violation.


When RAM cache is attempting to match an ETag and fails to find it in the header field.


No workaround at this time.

Fix Information

SOD no longer halts TMM while RAM cache is processing a header.

Behavior Change