Bug ID 825561: TMM may core in a rare condition serving an HTTP response

Last Modified: Dec 13, 2019

Bug Tracker

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

Known Affected Versions:
15.0.0, 15.0.1

Fixed In:
15.1.0

Opened: Sep 12, 2019
Severity: 2-Critical

Symptoms

Sometimes when HTTP server receives a POST request, it can serve a response prior the whole request payload is arrived. When a response is chunked in some occasions TMM may fail to process it correctly.

Impact

TMM cores, failover condition occurs, and traffic processing can be interrupted while tmm restarts.

Conditions

-- The BIG-IP system has a virtual server configured with HTTP profile. -- POST request is processing. -- A chunked response is served before the whole request is received. -- A Security Policy is applied to the virtual server.

Workaround

None.

Fix Information

The BIG-IP system now properly handles early chunked responses and does not allow TMM to core for this reason.

Behavior Change