Last Modified: Feb 03, 2026
Affected Product(s):
BIG-IP AFM, LTM
Known Affected Versions:
17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3, 17.5.1.4
Opened: Dec 27, 2025 Severity: 1-Blocking
-- TMM processes generate core dumps (SIGABRT) when activating firewall policies with high rule counts (20,000+ rules) across multiple virtual servers (20+) --- SOD (System Oversight Daemon) sends SIGABRT signal to TMM processes --- Observe the ltm log "sod[10802]: 01140041:5: Killing tmm.0 pid 23754."
Traffic disrupted while tmm restarts.
1, Deploy couple of tenants with 8 slots on each Chasis 2, Set up an HA pair (Active/Standby). 3, Provision the system with LTM, AFM, and AVR modules. 4, Create a Network Firewall policy containing approximately 20,000 rules. 5, Attach the firewall policy to a virtual server. 6, Create 20 or more virtual servers, attaching the same firewall policy to each.
Disable SOD Heartbeat Monitoring for all TMMs --- tmsh modify sys daemon-ha tmm heartbeat disabled.
None