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/
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