> 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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