[DPDK/core Bug 1527] Running ring_stress_autotest with > 112 CPUs hangs test

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1527

            Bug ID: 1527
           Summary: Running ring_stress_autotest with > 112 CPUs hangs
                    test
           Product: DPDK
           Version: 24.07
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev at dpdk.org
          Reporter: drc at linux.ibm.com
  Target Milestone: ---

System: IBM POWER9 system (PowerNV) with 128 CPUs (2 NUMA nodes), 256GB RAM
** Unverified on x86_64 system with similar size **
OS: RHEL 8.10 (gcc 8.5.0 & gcc 13.2.1)
DPDK: 24.07 (& all prior releases as far back as 21.05)

Running the ring stress autotest causes the test to hang as follows:

~/src/dpdk/build/app/test/dpdk-test --log-level=debug -l 2-127 --no-pci
--no-huge ring_stress_autotest
EAL: Detected CPU lcores: 128
EAL: Detected NUMA nodes: 2
EAL: Static memory layout is selected, amount of reserved memory can be
adjusted with -m or --socket-mem
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /run/user/1000/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'VA'
APP: HPET is not enabled, using TSC as default timer
RTE>>ring_stress_autotest
TEST-CASE MP/MC MT-WRK_ENQ_DEQ-MST_NONE-PRCS START
lcore_stat_dump(AGGREGATE)={
        nb_cycle=30720070618(60000137.93 usec),
        DEQ+ENQ={
                nb_call=24261400,
                nb_obj=861278043,
                nb_cycle=3701862086301,
                obj/call(avg): 35.50
                cycles/obj(avg): 4298.10
                cycles/call(avg): 152582.38
                max cycles/call=16721609(32659.39 usec),
                min cycles/call=346(0.68 usec),
        },
};
TEST-CASE MP/MC MT-WRK_ENQ_DEQ-MST_NONE-PRCS OK
TEST-CASE MP/MC MT-WRK_ENQ_DEQ-MST_NONE-AVG START
lcore_stat_dump(AGGREGATE)={
        nb_cycle=30720078841(60000153.99 usec),
        DEQ+ENQ={
                nb_call=24328571,
                nb_obj=863669930,
                nb_cycle=3840005487992,
                obj/call(avg): 35.50
                cycles/obj(avg): 4446.15
                cycles/call(avg): 157839.34
        },
};
TEST-CASE MP/MC MT-WRK_ENQ_DEQ-MST_NONE-AVG OK
TEST-CASE MT_RTS MT-WRK_ENQ_DEQ-MST_NONE-PRCS START
<<< Test hangs at this point, have waited up to 24 hours to complete >>>

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