[Bug]: [T2][Chassis] - 'test_bgp_queue' fails with one extra packet on queue UC6

[sanjair-git]

Issue Description

On T2 chassis, we see 'test_bgp_queue' test fails with the following assertion error. It is expected that except queue 7, all other counter values for queues 0-6 should be zero. But in this case, we see one packet during test run on queue 6.

                    logger.info(ifname)
                    for q in range(0, 7):
>                       assert(get_queue_counters(asichost, ifname, q) == 0)
E                       AssertionError

FYI, the same test passes on many other DUTs.

Results you see

sudo show queue counters {interface-name} -n asic0

Last cached time for asic0 was 2025-01-04T09:14:43.451676
Ethernet96 Last cached time for asic0 was 2025-01-04T09:14:43.451676
      Port    TxQ    Counter/pkts    Counter/bytes    Drop/pkts    Drop/bytes
----------  -----  --------------  ---------------  -----------  ------------
Ethernet96    UC0               0                0            0             0
Ethernet96    UC1               0                0            0             0
Ethernet96    UC2               0                0            0             0
Ethernet96    UC3               0                0            0             0
Ethernet96    UC4               0                0            0             0
Ethernet96    UC5               0                0            0             0
Ethernet96    UC6               1               82            0             0    ==========> Extra packet
Ethernet96    UC7             205           18,875            0             0
Ethernet96    MC8               0                0            0             0
Ethernet96    MC9               0                0            0             0
Ethernet96   MC10               0                0            0             0
Ethernet96   MC11               0                0            0             0
Ethernet96   MC12               0                0            0             0
Ethernet96   MC13               0                0            0             0
Ethernet96   MC14               0                0            0             0
Ethernet96   MC15               0                0            0             0

Results you expected to see

Except queue 7, for all other queues, Counter/pkts value should be zero during the test run.

Is it platform specific

broadcom

Relevant log output

logger.info(ifname)
                    for q in range(0, 7):
>                       assert(get_queue_counters(asichost, ifname, q) == 0)
E                       AssertionError

Last cached time for asic0 was 2025-01-04T09:14:43.451676
Ethernet96 Last cached time for asic0 was 2025-01-04T09:14:43.451676
      Port    TxQ    Counter/pkts    Counter/bytes    Drop/pkts    Drop/bytes
----------  -----  --------------  ---------------  -----------  ------------
Ethernet96    UC0               0                0            0             0
Ethernet96    UC1               0                0            0             0
Ethernet96    UC2               0                0            0             0
Ethernet96    UC3               0                0            0             0
Ethernet96    UC4               0                0            0             0
Ethernet96    UC5               0                0            0             0
Ethernet96    UC6               1               82            0             0    ==========> Extra packet
Ethernet96    UC7             205           18,875            0             0
Ethernet96    MC8               0                0            0             0
Ethernet96    MC9               0                0            0             0
Ethernet96   MC10               0                0            0             0
Ethernet96   MC11               0                0            0             0
Ethernet96   MC12               0                0            0             0
Ethernet96   MC13               0                0            0             0
Ethernet96   MC14               0                0            0             0
Ethernet96   MC15               0                0            0             0

### Output of `show version`

```shell
SONiC Software Version: SONiC.HEAD.911514-202405-eded7e52f
SONiC OS Version: 12
Distribution: Debian 12.8
Kernel: 6.1.0-22-2-amd64
Build commit: eded7e52f
Build date: Fri Jan  3 22:41:31 UTC 2025

Attach files (if any)

No response