Thanks Damjan for looking into this.
I also review the code for the same but If that is the case then app will
not work properly even first time.
Thanks,
Chetan Bhasin
On Thu, Feb 14, 2019 at 9:33 PM Damjan Marion <dmar...@me.com> wrote:
>
>
> On 14 Feb 2019, at 07:54, chetan bhasin <chetan.bhasin...@gmail.com>
> wrote:
>
> Hi,
>
> We are using vpp 18.0.1 . We have created a memif client app , which is
> connecting to vpp via memif and sending UDP packet .
>
> One of our plugin is receiving that packet, processing it and generating
> an UDP response.
>
> First time it is works fine , when we stop and re-start our client app ,
> we are getting crash at vpp.
>
> Please provide hint/suggestion
>
> Back-trace for the same is as below -
> (gdb) bt
> #0 0x00002b8d3ba61207 in raise () from /lib64/libc.so.6
> #1 0x00002b8d3ba628f8 in abort () from /lib64/libc.so.6
> #2 0x0000000000406a29 in os_panic ()
> at vpp_1801/build-data/../src/vpp/vnet/main.c:266
> #3 0x00002b8d3ae2538b in debugger ()
> at vpp_1801/build-data/../src/vppinfra/error.c:84
> #4 0x00002b8d3ae25792 in _clib_error (how_to_die=2, function_name=0x0,
> line_number=0,
> fmt=0x2b8d3a154290 "%s:%d (%s) assertion `%s' fails")
> at vpp_1801/build-data/../src/vppinfra/error.c:143
> *#5 0x00002b8d3986416d in vlib_buffer_advance (b=0x2aaaaac00000, l=14)*
> * at vpp_1801/build-data/../src/vlib/buffer.h:210*
> *Here packet is blank*
>
> *210 ASSERT (b->current_length >= l);*
>
> *(gdb) p (b->current_length)*
>
> *$8 = 0*
>
> *(gdb) p *b*
>
> *$9 = {cacheline0 = 0x2aaaaac00000 "", template_start = 0x2aaaaac00000 "",
> current_data = 0, current_length = 0, flags = 262144,*
>
> * template_end = 0x2aaaaac00008 "", next_buffer = 0, error = 0,
> current_config_index = 0, feature_arc_index = 0 '\000', n_add_refs = 0
> '\000',*
>
> * buffer_pool_index = 0 '\000', dont_waste_me = "", opaque = {0, 0, 0, 0,
> 2864712168, 10922, 55557824, 1, 4072669248, 7},*
>
> * cacheline1 = 0x2aaaaac00040 "@\001\300\252\252*", trace_index =
> 2864709952, recycle_count = 10922, total_length_not_including_first_buffer
> = 4072669504,*
>
> * align_pad = 7, opaque2 = {65664, 1, 0, 0, 0, 60, 60, 0, 0, 142606336,
> 0, 0}, cacheline2 = 0x2aaaaac00080 "",*
>
> * pre_data = "\000\000\000\000\000\000\000\000\300\276O\003\001", '\000'
> <repeats 19 times>, "\200", '\000' <repeats 33 times>,
> "<\000\000\021\006\300\000\000\000\000\000@\031\000\000\000\000\000\000\000\000\000\001\000\000\000\004\000\000\000\000\000\016",
> '\000' <repeats 28 times>, data = 0x2aaaaac00100 ""}*
>
>
>
> #6 0x00002b8d398671ab in ethernet_input_inline (vm=0x2b8d3d0650e0,
> node=0x2b8d3cc25c8c, from_frame=0x2b8d3cc3b1c0,
> variant=ETHERNET_INPUT_VARIANT_ETHERNET)
> at vpp_1801/build-data/../src/vnet/ethernet/node.c:457
> #7 0x00002b8d39868252 in ethernet_input (vm=0x2b8d3d0650e0,
> node=0x2b8d3cc25c8c, from_frame=0x2b8d3cc3b1c0)
> at vpp_1801/build-data/../src/vnet/ethernet/node.c:796
> #8 0x00002b8d394b58e3 in dispatch_node (vm=0x2b8d3d0650e0,
> node=0x2b8d3cc25c8c, type=VLIB_NODE_TYPE_INTERNAL,
> dispatch_state=VLIB_NODE_STATE_POLLING, frame=0x2b8d3cc3b1c0,
> last_time_stamp=14871127365603654)
> at vpp_1801/build-data/../src/vlib/main.c:988
> #9 0x00002b8d394b5ec6 in dispatch_pending_node (vm=0x2b8d3d0650e0,
> pending_frame_index=0,
> last_time_stamp=14871127365603654)
> at vpp_1801/build-data/../src/vlib/main.c:1138
> #10 0x00002b8d394b80d7 in vlib_main_or_worker_loop (vm=0x2b8d3d0650e0,
> is_main=0)
> at vpp_1801/build-data/../src/vlib/main.c:1609
> #11 0x00002b8d394b81c8 in vlib_worker_loop (vm=0x2b8d3d0650e0)
> at vpp_1801/build-data/../src/vlib/main.c:1634
> #12 0x00002b8d394faf09 in vlib_worker_thread_fn (arg=0x2b8d3ddec280)
> at vpp/vpp_1801/build-data/../src/vlib/threads.c:1744
> #13 0x00002b8d3ae4a7ac in clib_calljmp ()
> at vpp_1801/build-data/../src/vppinfra/longjmp.S:110
> #14 0x00002b8f50924d40 in ?? ()
> ---Type <return> to continue, or q <return> to quit---
> #15 0x00002b8d394f5dc3 in vlib_worker_thread_bootstrap_fn
> (arg=0x2b8d3ddec280)
>
>
> Looks like your app i not setting packet length correctly. Packet cannot
> be 0 length...
>
>
> --
> Damjan
>
>
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