Bug ID 452129: TMM core with Assertion "valid xfrag" failed

Last Modified: Sep 13, 2023

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

Known Affected Versions:
10.2.4, 11.5.1, 11.5.2, 11.5.3, 11.5.4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 11.6.0, 11.6.1, 11.6.2, 11.6.3,,,,, 11.6.4, 11.6.5,,,

Opened: Mar 12, 2014

Severity: 3-Major


TMM may core after logging an error message like the following in the TMM log: notice panic: ../kern/xbuf.c:2273: Assertion "valid xfrag" failed. Analysis of the resulting TMM core may indicate that the original cause of the core was a segmentation fault resulting from an xbuf with a length discrepancy, in which the xfrag chain contains fewer bytes than the xbuf length indicates it should. In this case, the pointer to the next supposed xfrag in the chain is dereferenced, but since the pointer is NULL, as segmentation fault (SIGSEGV) occurs.


Traffic disrupted while tmm restarts.


The problem has been observed on BIG-IP 3600 and 3900 appliances running BIG-IP v10.2.4, but may occur under other conditions as well.


None known.

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips