[dpdk-dev] [Bug 785] rte_pktmbuf_alloc fails with a segmentation fault but rte_pktmbuf_pool_create returns valid data

[dpdk-dev] [Bug 785] rte_pktmbuf_alloc fails with a segmentation fault but rte_pktmbuf_pool_create returns valid data

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=785

            Bug ID: 785
           Summary: rte_pktmbuf_alloc fails with a segmentation fault but
                    rte_pktmbuf_pool_create returns valid data
           Product: DPDK
           Version: 20.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev@dpdk.org
          Reporter: brydon_gibson@dell.com
  Target Milestone: ---

(backtrace below) mbuf_pool is valid, and there is sufficient memory onboard,
yet __mempool_generic_get (from rte_pktmbuf_alloc) fails because cache points
to invalid memory. There doesn't seem to be any way of detecting that something
is wrong because pool_create returns perfectly good data.

Backtrace:
Program received signal SIGSEGV, Segmentation fault.
0x0000000000402735 in __mempool_generic_get (cache=0x2f6e69622f77735f, n=1,
obj_table=0x7fffffffe0d8, mp=0x7fffffffe6db) at
/usr/local/include/rte_mempool.h:1417
1417            if (unlikely(cache == NULL || n >= cache->size))
(gdb) bt full
#0  0x0000000000402735 in __mempool_generic_get (cache=0x2f6e69622f77735f, n=1,
obj_table=0x7fffffffe0d8, mp=0x7fffffffe6db) at
/usr/local/include/rte_mempool.h:1417
        ret = 0
        len = 4294960256
        index = 32767
        cache_objs = 0x0
#1  rte_mempool_generic_get (cache=0x2f6e69622f77735f, n=1,
obj_table=0x7fffffffe0d8, mp=0x7fffffffe6db) at
/usr/local/include/rte_mempool.h:1491
        ret = 0
#2  rte_mempool_get_bulk (n=1, obj_table=0x7fffffffe0d8, mp=0x7fffffffe6db) at
/usr/local/include/rte_mempool.h:1526
        cache = 0x2f6e69622f77735f
#3  rte_mempool_get (obj_p=0x7fffffffe0d8, mp=0x7fffffffe6db) at
/usr/local/include/rte_mempool.h:1552
No locals.
#4  rte_mbuf_raw_alloc (mp=0x7fffffffe6db) at /usr/local/include/rte_mbuf.h:590
        m = 0x1656380
#5  0x0000000000402cd2 in rte_pktmbuf_alloc (mp=0x7fffffffe6db) at
/usr/local/include/rte_mbuf.h:895
        m = 0x7ffff70e5d4d <__GI_rewind+109>
#6  0x000000000040798e in getAndMbufData (argstring=0x7a9935 "-f",
einf=0x7fffffffe480) at cmdParser.c:73
        fd = 0x1656380
        fsize = 0
        readSize = 5
        data = 0x1651f20 ""
        argv = {0x4095f0 "progname", 0x7a9935 "-f", 0x7a9938 "test.txt", 0x0}
        argc = 3
        opt = -1
        myBuf = 1
        total_mbufs = 0
        bufToUse = 0x7fffffffe70a

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