CPU: Intel(R) Xeon(R) Gold 6238R CPU @ 2.20GHz NIC: Mellanox Technologies MT28800 Family [ConnectX-5 Ex] OFED: MLNX_OFED_LINUX-23.04-0.5.3.3 FW: 16.35.2000 Kernel: 5.10.0-21-amd64 Commit 633684e0 "net/mlx5: fix error CQE dumping for vectorized Rx" presumably introduced a regression: Rx queues eventually stop with "CQ error on CQN 0x57d, syndrome 0x1" in dmesg. There is unfortunately no repro with testpmd yet. The error happens under certain CPU load from an app and with a different delay for each RxQ, which suggests that this may be a concurrency issue.