Yeah, unless you are not setting length correctly only on some packets...
> On 14 Feb 2019, at 08:05, chetan bhasin <chetan.bhasin...@gmail.com> wrote: > > 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 > <mailto:dmar...@me.com>> wrote: > > >> On 14 Feb 2019, at 07:54, chetan bhasin <chetan.bhasin...@gmail.com >> <mailto: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 > -- Damjan
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