Bug ID 726616: TMM crashes when a session is terminated

Last Modified: Dec 15, 2020

Bug Tracker

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

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1, 14.0.0,,,,

Fixed In:

Opened: Jul 03, 2018
Severity: 3-Major


TMM crashes when it is releasing the memory used by a session that is terminated. Either one of the following error messages might appear in the TMM log: -- notice panic: ../kern/umem.c:4166: Assertion "valid type" failed. -- notice panic: ../kern/page_alloc.c:705: Assertion "vmem_hashlist_remove not found" failed.


TMM restarts, causing service interruption if the BIG-IP system is not part of a high-availability setup.


The memory used by a session is corrupted during the lifetime of the session. This issue happens infrequently.


There is no workaround at this time.

Fix Information

TMM no longer crashes when removing an access session.

Behavior Change