Hi Pim, Well, I wasn't aware of "bvi ..." commands. Anyway, usually I go with something like:
create loopback interface instance 20 set interface state loop20 up create bridge-domain 20 learn 1 forward 1 flood 1 arp-term 1 arp-ufwd 0 set interface l2 bridge loop20 20 bvi On Sun, 27 Mar 2022 at 00:41, Pim van Pelt <p...@ipng.nl> wrote: > Hoi, > > I've noticed that a pattern of 'create loopback; delete loopback; create > bvi' as well as 'create bvi; delete bvi; create loopback' makes VPP at HEAD > unhappy. > I've actually long since wondered what the difference is between BVI and > Loopback interface types, other than the BVI plumbing lives in l2/l2_bvi.c > and the loopback lives in ethernet/interface.c their _use_ seems very > similar if not identical. I understand that BVIs are used in bridges, but a > loopback in practice serves that purpose equally well. > > I assume the issue is in the bvi/loop deletion not the creation, but I > stared at this for an hour or so and could not understand it. Can somebody > more knowledgeable help me out ? > Take the following simple repro to crash VPP. The assertion in noce.c:194 > fails in both cases: > > *1) create loop after bvi:* > DBGvpp# show version > vpp v22.06-rc0~268-g4859d8d8e built by pim on hippo at 2022-03-23T19:23:53 > DBGvpp# bvi create instance 0 > bvi0 > DBGvpp# bvi delete bvi0 > DBGvpp# create loopback interface instance 0 > > *0: /home/pim/src/vpp/src/vlib/node.c:194 (vlib_node_add_next_with_slot) > assertion `slot == p[0]' fails* > Thread 1 "vpp_main" received signal SIGABRT, Aborted. > __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50 > 50 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory. > (gdb) bt > #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50 > #1 0x00007ffff69de859 in __GI_abort () at abort.c:79 > #2 0x00000000004072f3 in os_panic () at > /home/pim/src/vpp/src/vpp/vnet/main.c:413 > #3 0x00007ffff6d2ebc9 in debugger () at > /home/pim/src/vpp/src/vppinfra/error.c:84 > #4 0x00007ffff6d2e92d in _clib_error (how_to_die=2, function_name=0x0, > line_number=0, fmt=0x7ffff6f3b19c "%s:%d (%s) assertion `%s' fails") > at /home/pim/src/vpp/src/vppinfra/error.c:143 > #5 0x00007ffff6ea462b in vlib_node_add_next_with_slot (vm=0x7fff96800740, > node_index=696, next_node_index=648, slot=2) > at /home/pim/src/vpp/src/vlib/node.c:194 > #6 0x00007ffff6ea61d8 in vlib_node_add_named_next_with_slot > (vm=0x7fff96800740, node=696, name=0x7ffff7cc7c86 "l2-input", slot=2) > at /home/pim/src/vpp/src/vlib/node.c:267 > #7 0x00007ffff70d5ce5 in vnet_create_loopback_interface > (sw_if_indexp=0x7fff515421e8, mac_address=0x7fff515421e2 "", is_specified=1 > '\001', > user_instance=0) at /home/pim/src/vpp/src/vnet/ethernet/interface.c:890 > #8 0x00007ffff70d98df in create_simulated_ethernet_interfaces > (vm=0x7fff96800740, input=0x7fff51542e40, cmd=0x7fff99b88088) > at /home/pim/src/vpp/src/vnet/ethernet/interface.c:930 > #9 0x00007ffff6e681d4 in vlib_cli_dispatch_sub_commands > (vm=0x7fff96800740, cm=0x4312e0 <vlib_global_main+32>, > input=0x7fff51542e40, > parent_command_index=1146) at /home/pim/src/vpp/src/vlib/cli.c:592 > #10 0x00007ffff6e67f4e in vlib_cli_dispatch_sub_commands > (vm=0x7fff96800740, cm=0x4312e0 <vlib_global_main+32>, > input=0x7fff51542e40, > parent_command_index=33) at /home/pim/src/vpp/src/vlib/cli.c:549 > #11 0x00007ffff6e67f4e in vlib_cli_dispatch_sub_commands > (vm=0x7fff96800740, cm=0x4312e0 <vlib_global_main+32>, > input=0x7fff51542e40, > parent_command_index=0) at /home/pim/src/vpp/src/vlib/cli.c:549 > #12 0x00007ffff6e66e98 in vlib_cli_input (vm=0x7fff96800740, > input=0x7fff51542e40, function=0x7ffff6ef2c40 <unix_vlib_cli_output>, > function_arg=0) > at /home/pim/src/vpp/src/vlib/cli.c:695 > #13 0x00007ffff6ef48dd in unix_cli_process_input (cm=0x7ffff6f69748 > <unix_cli_main>, cli_file_index=0) at > /home/pim/src/vpp/src/vlib/unix/cli.c:2617 > #14 0x00007ffff6ef1cb1 in unix_cli_process (vm=0x7fff96800740, > rt=0x7fff9bc4ea80, f=0x0) at /home/pim/src/vpp/src/vlib/unix/cli.c:2746 > #15 0x00007ffff6e9f26d in vlib_process_bootstrap (_a=140735646532920) at > /home/pim/src/vpp/src/vlib/main.c:1220 > #16 0x00007ffff6d47e08 in clib_calljmp () at > /home/pim/src/vpp/src/vppinfra/longjmp.S:123 > #17 0x00007fff92380530 in ?? () > #18 0x00007ffff6e9eb3f in vlib_process_startup (vm=0x1, p=0x8, > f=0x7fff968008b0) at /home/pim/src/vpp/src/vlib/main.c:1245 > #19 0x00007fff96800740 in ?? () > #20 0x00007fff923805c0 in ?? () > #21 0x00007ffff6eff104 in vlib_process_signal_event (vm=<error reading > variable: Cannot access memory at address 0x2a7>, > node_index=<error reading variable: Cannot access memory at address > 0x29f>, > type_opaque=<error reading variable: Cannot access memory at address > 0x297>, > data=<error reading variable: Cannot access memory at address 0x28f>) > at /home/pim/src/vpp/src/vlib/node_funcs.h:1025 > Backtrace stopped: previous frame inner to this frame (corrupt stack?) > > *2) Create bvi after loop:* > DBGvpp# show version > vpp v22.06-rc0~268-g4859d8d8e built by pim on hippo at 2022-03-23T19:23:53 > DBGvpp# create loopback > loop0 > DBGvpp# delete loopback interface intfc loop0 > DBGvpp# bvi create > *0: /home/pim/src/vpp/src/vlib/node.c:194 (vlib_node_add_next_with_slot) > assertion `slot == p[0]' fails > * > > > Thread 1 "vpp_main" received signal SIGABRT, Aborted. > > __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50 > > 50 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory. > > (gdb) bt > > #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50 > > #1 0x00007ffff69de859 in __GI_abort () at abort.c:79 > > #2 0x00000000004072f3 in os_panic () at > /home/pim/src/vpp/src/vpp/vnet/main.c:413 > > #3 0x00007ffff6d2ebc9 in debugger () at > /home/pim/src/vpp/src/vppinfra/error.c:84 > > #4 0x00007ffff6d2e92d in _clib_error (how_to_die=2, function_name=0x0, > line_number=0, fmt=0x7ffff6f3b19c "%s:%d (%s) assertion `%s' fails") > > at /home/pim/src/vpp/src/vppinfra/error.c:143 > > #5 0x00007ffff6ea462b in vlib_node_add_next_with_slot (vm=0x7fff96800740, > node_index=696, next_node_index=648, slot=0) > at /home/pim/src/vpp/src/vlib/node.c:194 > > #6 0x00007ffff6ea61d8 in vlib_node_add_named_next_with_slot > (vm=0x7fff96800740, node=696, name=0x7ffff7cc7c86 "l2-input", slot=0) > > at /home/pim/src/vpp/src/vlib/node.c:267 > > #7 0x00007ffff7123f69 in l2_bvi_create (user_instance=4294967295, > mac_in=0x7fff515424e8, sw_if_indexp=0x7fff515424f8) > > at /home/pim/src/vpp/src/vnet/l2/l2_bvi.c:186 > > #8 0x00007ffff71266b9 in l2_bvi_create_cli (vm=0x7fff96800740, > input=0x7fff51542e40, cmd=0x7fff99b87868) > > at /home/pim/src/vpp/src/vnet/l2/l2_bvi.c:256 > > #9 0x00007ffff6e681d4 in vlib_cli_dispatch_sub_commands > (vm=0x7fff96800740, cm=0x4312e0 <vlib_global_main+32>, > input=0x7fff51542e40, > parent_command_index=1124) at /home/pim/src/vpp/src/vlib/cli.c:592 > > #10 0x00007ffff6e67f4e in vlib_cli_dispatch_sub_commands > (vm=0x7fff96800740, cm=0x4312e0 <vlib_global_main+32>, > input=0x7fff51542e40, > parent_command_index=0) at /home/pim/src/vpp/src/vlib/cli.c:549 > > #11 0x00007ffff6e66e98 in vlib_cli_input (vm=0x7fff96800740, > input=0x7fff51542e40, function=0x7ffff6ef2c40 <unix_vlib_cli_output>, > function_arg=0) > at /home/pim/src/vpp/src/vlib/cli.c:695 > > #12 0x00007ffff6ef48dd in unix_cli_process_input (cm=0x7ffff6f69748 > <unix_cli_main>, cli_file_index=0) at > /home/pim/src/vpp/src/vlib/unix/cli.c:2617 > #13 0x00007ffff6ef1cb1 in unix_cli_process (vm=0x7fff96800740, > rt=0x7fff9bc4ea80, f=0x0) at /home/pim/src/vpp/src/vlib/unix/cli.c:2746 > > #14 0x00007ffff6e9f26d in vlib_process_bootstrap (_a=140735646532920) at > /home/pim/src/vpp/src/vlib/main.c:1220 > #15 0x00007ffff6d47e08 in clib_calljmp () at > /home/pim/src/vpp/src/vppinfra/longjmp.S:123 > > #16 0x00007fff92380530 in ?? () > > #17 0x00007ffff6e9eb3f in vlib_process_startup (vm=0x1, p=0x8, > f=0x7fff968008b0) at /home/pim/src/vpp/src/vlib/main.c:1245 > > #18 0x00007fff96800740 in ?? () > #19 0x00007fff923805c0 in ?? () > #20 0x00007ffff6eff104 in vlib_process_signal_event (vm=<error reading > variable: Cannot access memory at address 0x2a7>, > node_index=<error reading variable: Cannot access memory at address > 0x29f>, > type_opaque=<error reading variable: Cannot access memory at address > 0x297>, > data=<error reading variable: Cannot access memory at address 0x28f>) > at /home/pim/src/vpp/src/vlib/node_funcs.h:1025 > Backtrace stopped: previous frame inner to this frame (corrupt stack?) > > -- > Pim van Pelt <p...@ipng.nl> > PBVP1-RIPE - http://www.ipng.nl/ > > > > -- Best regards Stanislav Zaikin
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