[DPDK/core Bug 2069] [dpdk 26.11-rc1] multiprocess/test_multiprocess_symmetric_mp_packet second process coredump

[DPDK/core Bug 2069] [dpdk 26.11-rc1] multiprocess/test_multiprocess_symmetric_mp_packet second process coredump

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=2069

            Bug ID: 2069
           Summary: [dpdk 26.11-rc1]
                    multiprocess/test_multiprocess_symmetric_mp_packet
                    second process coredump
           Product: DPDK
           Version: 26.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev@dpdk.org
          Reporter: daxuex.gao@intel.com
  Target Milestone: ---

Environment
===========
DPDK version: 26.11.0-rc1(9a45341f18a1a)
OS: Fedora Linux 44 (Forty Four)/Linux 7.2.5-200.fc44.x86_64
Compiler: gcc version 16.2.1
Hardware platform: Intel(R) Xeon(R) Platinum 8490H
NIC hardware: Ethernet Controller E810-C for QSFP 1592 [8086:1592 (rev 02)]
NIC firmware: 5.01 0x80021f8b 1.4031.0
NIC driver: ice-2.7.4
DDP package:  ice comms 1.3.63.0

Test Setup
Steps to reproduce
==================
1.Build dpdk 
CC=gcc meson -Dlibdir=lib
-Dexamples='multi_process/client_server_mp/mp_server,multi_process/client_server_mp/mp_client,multi_process/simple_mp,multi_process/symmetric_mp'
--default-library=static x86_64-native-linuxapp-gcc -Dmax_lcores=240
ninja -C x86_64-native-linuxapp-gcc/

2.Start testpmd
dpdk-devbind.py --force --bind=vfio-pci 0000:45:00.0 -a 0000:47:00.0
x86_64-native-linuxapp-gcc/examples/dpdk-symmetric_mp -l 2 -n 4 -a 0000:45:00.0
-a 0000:47:00.0  --file-prefix=dpdk_6818_20261022163537     --proc-type=auto --
-p 0x3 --num-procs=2 --proc-id=1

x86_64-native-linuxapp-gcc/examples/dpdk-symmetric_mp -l 2 -n 4 -a 0000:45:00.0
-a 0000:47:00.0  --file-prefix=dpdk_6818_20261022163537     --proc-type=auto --
-p 0x3 --num-procs=2 --proc-id=1

After stopping the first testpmd process, the second process generated a core
dump:
Error result:
Segmentation fault         (core dumped)
x86_64-native-linuxapp-gcc/examples/dpdk-symmetric_mp -l 2 -n 4 -a 0000:45:00.0
-a 0000:47:00.0 --file-prefix=dpdk_6818_20261022163537 --proc-type=auto -- -p
0x3 --num-procs=2 --proc-id=1

Expected Result:
The first testpmd process exits, but the second testpmd process does not exit
automatically.
# x86_64-native-linuxapp-gcc/examples/dpdk-symmetric_mp -l 2 -n 4 -a
0000:45:00.0 -a 0000:47:00.0  --file-prefix=dpdk_6818_20261022163537    
--proc-type=auto -- -p 

^CPort 0: RX - 0, TX - 0, Drop - 0
Port 1: RX - 0, TX - 0, Drop - 0

# x86_64-native-linuxapp-gcc/examples/dpdk-symmetric_mp -l 2 -n 4 -a
0000:45:00.0 -a 0000:47:00.0  --file-prefix=dpdk_6818_20261022163537    
--proc-type=auto -- -p 

^CPort 0: RX - 0, TX - 0, Drop - 0
Port 1: RX - 0, TX - 0, Drop - 0

Regression
Is this issue a regression: N

Bad commit:
commit 9a0b3c409db1963a92d0a91868b1e45254845a8c
Author: Stephen Hemminger <stephen@networkplumber.org>
Date:   Mon Sep 7 10:03:22 2026 -0700

    examples/symmetric_mp: do not print or exit in handler
    The SIGINT and SIGTERM handler called printf() and exit() which are
    not async-signal-safe.
    Set a flag, let the forwarding loops return, and print the stats from
    main() after joining the lcores.
    Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
    Acked-by: Bruce Richardson <bruce.richardson@intel.com>

examples/multi_process/symmetric_mp/main.c | 24 ++++++++++++++++++------

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