Is it multiple threads or multiple processes as the secondary as Maayan mentioned? BTW, is it a bond configuration?

From: Maayan Kashani <mkashani@nvidia.com>
Sent: Wednesday, December 4, 2024 3:36 PM
To: narsimharaj pentam <pnarsimharaj@gmail.com>; users@dpdk.org
Subject: RE: mlx5_stats_get reports crash: invalid ibv_context

External email: Use caution opening links or attachments

Hi, Narsimha,

Sorry for the late response,

in mlx5 stats we do mention that

- For secondary process:

- "out_of_buffer" statistics is not supported.

Do you have some testpmd reproduction?

Regards,

Maayan Kashani

From: narsimharaj pentam <pnarsimharaj@gmail.com>
Sent: Wednesday, 28 February 2024 6:32
To: users@dpdk.org
Subject: mlx5_stats_get reports crash: invalid ibv_context

External email: Use caution opening links or attachments

Hi Team,

A crash is observed on MLX5 device while fetching stats "mlx5_stats_get" , looks like ibv_context is getting corrupted ( ibctx=0x1ede838800001e)

We do access the stats from multiple threads simultaneously , does this create any issue ?

Platform details:

Platform : VM

Hypervisor : Linux KVM

Cloud : None

Application : 64-bit

Datapath : DPDK

DPDK : dpdk-22.11.1

Library : libmlx5-rdmav34.so

Program terminated with signal 11, Segmentation fault.

#0 0x00007ffff0114c83 in mlx5_get_dv_ops (ibctx=0x1ede838800001e) at ../providers/mlx5/mlx5.c:2734

2734 ../providers/mlx5/mlx5.c: No such file or directory.

(gdb) bt

#0 0x00007ffff0114c83 in mlx5_get_dv_ops (ibctx=0x1ede838800001e) at ../providers/mlx5/mlx5.c:2734

#1 0x00007ffff012f378 in mlx5dv_devx_obj_query (obj=0x27cabd0 <SipMedia::SipMedia(SipMedia const&)+1120>, in=0x7fffa6badb20, inlen=32, out=0x7fffa6badb40, outlen=1024)

at ../providers/mlx5/verbs.c:5808

#2 0x0000000004fc0eeb in mlx5_devx_cmd_queue_counter_query (dcs=0x31131be2b2c0, clear=clear@entry=0, out_of_buffers=out_of_buffers@entry=0x7fffa6bae010)

at ../usbc_gnu_src/drivers/common/mlx5/mlx5_devx_cmds.c:2845

#3 0x00000000052ec96d in mlx5_os_read_dev_stat (priv=priv@entry=0x31131bf66400, ctr_name=<optimized out>, ctr_name@entry=0x5b6fcc2 "out_of_buffer", stat=stat@entry=0x7fffa6bae010)

at ../usbc_gnu_src/drivers/net/mlx5/linux/mlx5_os.c:2684

#4 0x00000000053719e4 in mlx5_stats_get (dev=<optimized out>, stats=0x7fffa6bae690) at ../usbc_gnu_src/drivers/net/mlx5/mlx5_stats.c:155

#5 0x0000000005076873 in rte_eth_stats_get () at ../usbc_gnu_src/lib/ethdev/rte_ethdev.c:2733

Narsimha