Bug ID 1623801: A TMM crash is seen with Mellanox NICs when traffic exceeding the default MTU is interspersed with regular traffic

Last Modified: Apr 28, 2025

Affected Product(s):
BIG_IP_NEXT(SPK) SPK(all modules)

Known Affected Versions:
1.7, 1.7.1, 1.7.2, 1.7.3, 1.7.4, 1.7.5, 1.7.6, 1.7.7, 1.7.8, 1.7.9, 1.9, 1.9.0, 1.9.1, 1.9.2

Fixed In:
1.7.10

Opened: Aug 05, 2024

Severity: 3-Major

Symptoms

TMM crashes occur on the ingress side when using Mellanox CX5/CX6 NICs with the DPDK Mellanox MLX5 driver.

Impact

Traffic disrupted while tmm restarts.

Conditions

The DPDK MLX5 driver causes a crash in TMM after it receives a packet that exceeds its MTU, followed by a stream of legitimate traffic (~30 MB). This issue only affects NICs that use the DPDK MLX5 driver, such as ConnectX-5 and ConnectX-6.

Workaround

None

Fix Information

The MLX5 driver in the DPDK library has been fixed to correctly handle oversized packets.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips