[DPDK/examples Bug 1751] [dpdk24.07] multiprocess_symmetric_mp_packet: exiting the symmetric_mp example results in a core dump

[DPDK/examples Bug 1751] [dpdk24.07] multiprocess_symmetric_mp_packet: exiting the symmetric_mp example results in a core dump

[bugzilla]

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https://bugs.dpdk.org/show_bug.cgi?id=1751

            Bug ID: 1751
           Summary: [dpdk24.07] multiprocess_symmetric_mp_packet: exiting
                    the symmetric_mp example results in a core dump
           Product: DPDK
           Version: 25.03
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: examples
          Assignee: dev@dpdk.org
          Reporter: songx.jiale@intel.com
  Target Milestone: ---

Environment
===========
DPDK version: 9fe9c0b231c8da5435bfccb1963121b4277f961c version: dpdk25.07-rc3
OS: Ubuntu 24.04.2 LTS/6.8.0-60-generic
Compiler:  gcc version 13.3.0
Hardware platform: Intel(R) Xeon(R) Platinum 8380 CPU @ 2.30GHz
NIC hardware: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection
[8086:10fb] (rev 01)
NIC firmware: 
  driver: vfio-pci
  kdriver: ixgbe-6.1.5
  firmware-version: 0x000161bf

Test Setup
Steps to reproduce
==================
1. compile dpdk
rm -rf x86_64-native-linuxapp-gcc
CC=gcc meson -Denable_kmods=False -Dlibdir=lib
-Dexamples='multi_process/symmetric_mp' --default-library=static
x86_64-native-linuxapp-gcc
ninja -C x86_64-native-linuxapp-gcc

2. bind port to vfio-pci
./usertools/dpdk-devbind.py -b vfio-pci 0000:b1:00.0 0000:b1:00.1

3. start testpmd
the first process：
x86_64-native-linuxapp-gcc/examples/dpdk-symmetric_mp -l 1 -n 4 -a 0000:b1:00.0
-a 0000:b1:00.1  --file-prefix=dpdk_3722445_20250711093937     --proc-type=auto
-- -p 0x3 --num-procs=2 --proc-id=0

the secondary process：
x86_64-native-linuxapp-gcc/examples/dpdk-symmetric_mp -l 2 -n 4 -a 0000:b1:00.0
-a 0000:b1:00.1  --file-prefix=dpdk_3722445_20250711093937     --proc-type=auto
-- -p 0x3 --num-procs=2 --proc-id=1

4. exit the first process
^C


Results: 
========
^C
the first process： Exiting on signal 2Port 0: RX - 0, TX - 1, Drop - 0
Port 1: RX - 1, TX - 0, Drop - 0
APP: Close ports.
EAL: Error - exiting with code: 1
Error closing ports
EAL: failed to send to
(/var/run/dpdk/dpdk_3722445_20250711093937/mp_socket_794973_148a6526e3624d) due
to Bad file descriptor
EAL: Fail to send request
/var/run/dpdk/dpdk_3722445_20250711093937/mp_socket_794973_148a6526e3624d:mp_malloc_sync
EAL: Could not send sync request to secondary process 

the secondary process：
EAL: Detected CPU lcores: 80
EAL: Detected NUMA nodes: 2
EAL: Auto-detected process type: SECONDARY
EAL: Detected static linkage of DPDK
EAL: Multi-process socket
/var/run/dpdk/dpdk_3722445_20250711093937/mp_socket_794279_148a2f16b62b59
EAL: Selected IOVA mode 'VA'
EAL: VFIO support initialized
EAL: Using IOMMU type 1 (Type 1)
APP: Finished Process Init.
Lcore 2 using ports 0 1
lcore 2 using queue 1 of each port
Segmentation fault (core dumped)

Expected Result:
================
exit the symmetric_mp example normally.

bad commit:
===========
commit 4382d58097b41d1e1229ce5fc2943994bf44bd83
Author: Maayan Kashani <mkashani@nvidia.com>
Date:   Tue Jul 8 10:09:54 2025 +0300

    examples/multi_process: fix ports cleanup on exit

    Device was started but not stopped on exit signal.
    Added port stop and close on exit.

    Fixes: af75078fece3 ("first public release")
    Cc: stable@dpdk.org

    Signed-off-by: Maayan Kashani <mkashani@nvidia.com>
    Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>

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