Last Modified: Aug 19, 2026
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.5.1, 11.5.1 hf1, 11.5.1 hf2, 11.5.1 hf3, 11.5.1 hf4, 11.5.1 hf5, 11.5.1 hf6, 11.5.1 hf7, 11.5.1 hf8, 11.5.1 hf9, 11.5.1 hf10, 11.5.1 hf11, 11.5.2, 11.5.2 hf1, 11.5.3, 11.5.3 hf1, 11.5.3 hf2, 11.5.4, 11.5.4 hf1, 11.5.4 hf2, 11.5.4 hf3, 11.5.4 hf4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10
Fixed In:
11.6.0
Opened: Jan 08, 2014 Severity: 3-Major Related Article:
K16217
If connection mirroring is enabled on a BIG-IP HA configuration with connection pooling (OneConnect) also enabled, TMM on a standby member may core with a SIGFPE, after logging a message containing the following string in the TMM log: 'panic: TCP4: HUDEVT_EXPIRED (Connection expired) bad pcb magic (0x00585858)'.
TMM logs errors, generates SIGFPE messages and cores until connection mirroring is turned off.
This may occur when enabling connection mirroring on a BIG-IP HA configuration with connection pooling (OneConnect) also enabled.
You can use one of the following to work around the issue: -- Turn off connection mirroring. -- Turn off connection pooling (OneConnect).
Resolved TMM error message 'HUDEVT_EXPIRED (Connection expired) bad pcb magic (0x00585858)' and TMM core on standby member of HA configuration with connection mirroring and connection pooling (OneConnect) enabled.