[dpdk-users] segfault with dpdk 16.07 in rte_mempool_populate_phys

martin_curran-gray at keysight.com martin_curran-gray at keysight.com
Wed Aug 17 17:03:46 CEST 2016

Hi All,

Trying to move an application from 2.2.0 to 16.07

Tested out l2fwd in 16.7 , quite happy with that ( in fact very happy with the performance improvement I measure  over 2.2.0 )

But now trying to get our app moved over, and coming un-stuck.

As well as the main packet mbuf pools etc, our app has a little pool for error messages

When that is created with "rte_mempool_create" I get a segmentation fault from rte_mempool_populate_phys

It seems I have nothing valid for this call in rte_mempool.c to work with

    ret = rte_mempool_ops_alloc(mp);

I can see in the user guide in section 5.5 it talks about Mempool Handlers, and new API to do with rte_mempool_create_empty and rte_mempool_set_ops_byname

But the code of rte_mempool _create  seems to call rte_mempool_create_empty and rte_mempool_set_ops_byname

Then it calls the mp_init  before the rte_mempool_populate_default, down in which the call to rte_mempool_populate_phys eventually cores

I've tried building and running the ip_reassembly example program, and I can see that is uses rte_mempool_create in a similar, although admittedly slightly different fashion.
it has flags set as  MEMPOOL_F_SP_PUT | MEMPOOL_F_SC_GET  where as I have 0
but the code in rte_mempool_create uses the flags to call the set_ops_by_name slightly differently depending on what flags you have.

I tried changing my app to use the same parameters in the rte_mempool_create call as the example program, but I still get a segmentation fault

Is there something else I'm missing??

I looked through the ip_reassembly program, but couldn't see it making any extra calls to do anything to the pool before the create is called?

Any help gratefully received

Program terminated with signal 11, Segmentation fault.
#0  0x0000000000000000 in ?? ()

#0  0x0000000000000000 in ?? ()
#1  0x00007f9fa586cdde in rte_mempool_populate_phys (mp=0x7f9f9485dd00,
    vaddr=0x7f9f9485d2c0 <Address 0x7f9f9485d2c0 out of bounds>, paddr=8995066560, len=2560,
    free_cb=0x7f9fa586cbe0 <rte_mempool_memchunk_mz_free>, opaque=0x7f9fb40e4cb4)
    at /root/######/dpdk-16.07/lib/librte_mempool/rte_mempool.c:363
#2  0x00007f9fa586da4a in rte_mempool_populate_default (mp=0x7f9f9485dd00)
    at /root/######/dpdk-16.07/lib/librte_mempool/rte_mempool.c:583
#3  0x00007f9fa586dd49 in rte_mempool_create (name=0x7f9fa588fb56 "Error Ind Mempool", n=<value optimized out>,
    elt_size=256, cache_size=<value optimized out>, private_data_size=<value optimized out>,
    mp_init=0x7f9fa586c2b0 <rte_pktmbuf_pool_init>, mp_init_arg=0x0, obj_init=0x7f9fa586c1c0 <rte_pktmbuf_init>,
    obj_init_arg=0x0, socket_id=-1, flags=0) at /root/######/dpdk-16.07/lib/librte_mempool/rte_mempool.c:909



Martin Curran-Gray
HW/FPGA/SW Engineer
Keysight Technologies UK Ltd

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