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)


Regards,

Chetan
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