Hello Everyone!
I've encountered an issue with deleting route to 0.0.0.0/0 via some virtual
interface: vpp crashed with a SIGABRT. This issue can be reproduced with gre
interface on the current master 1c6486f7b8a00a1358d5c8f4ea1d874073bbcd6c:
```
DBGvpp# ip table add 10
DBGvpp# create gre tunnel src 1.1.1.1 dst 2.2.2.2
gre0
DBGvpp# ip route add 0.0.0.0/0 table 10 via gre0
DBGvpp# sh ip fib table 10
ipv4-VRF:10, fib_index:1, flow hash:[src dst sport dport proto ] epoch:0
flags:none locks:[CLI:1, ]
0.0.0.0/0
unicast-ip4-chain
[@0]: dpo-load-balance: [proto:ip4 index:9 buckets:1 uRPF:12 to:[0:0]]
[0] [@0]: dpo-drop ip4
0.0.0.0/32
unicast-ip4-chain
[@0]: dpo-load-balance: [proto:ip4 index:10 buckets:1 uRPF:8 to:[0:0]]
[0] [@0]: dpo-drop ip4
224.0.0.0/4
unicast-ip4-chain
[@0]: dpo-load-balance: [proto:ip4 index:12 buckets:1 uRPF:10 to:[0:0]]
[0] [@0]: dpo-drop ip4
240.0.0.0/4
unicast-ip4-chain
[@0]: dpo-load-balance: [proto:ip4 index:11 buckets:1 uRPF:9 to:[0:0]]
[0] [@0]: dpo-drop ip4
255.255.255.255/32
unicast-ip4-chain
[@0]: dpo-load-balance: [proto:ip4 index:13 buckets:1 uRPF:11 to:[0:0]]
[0] [@0]: dpo-drop ip4
/home/elantsev/vpp/src/vnet/fib/fib_attached_export.c:367
(fib_attached_export_purge) assertion `NULL != fed' fails
Thread 1 "vpp_main" received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51 ../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:51
#1 0x00007ffff5ac9801 in __GI_abort () at abort.c:79
#2 0x000055555555be0b in os_panic () at
/home/elantsev/vpp/src/vpp/vnet/main.c:355
#3 0x00007ffff5eacde9 in debugger () at
/home/elantsev/vpp/src/vppinfra/error.c:84
#4 0x00007ffff5ead1b8 in _clib_error (how_to_die=2, function_name=0x0,
line_number=0, fmt=0x7ffff7743bb8 "%s:%d (%s) assertion `%s' fails") at
/home/elantsev/vpp/src/vppinfra/error.c:143
#5 0x00007ffff74cbbe0 in fib_attached_export_purge (fib_entry=0x7fffb4bd2dd0)
at /home/elantsev/vpp/src/vnet/fib/fib_attached_export.c:367
#6 0x00007ffff74919de in fib_entry_post_flag_update_actions
(fib_entry=0x7fffb4bd2dd0, old_flags=(FIB_ENTRY_FLAG_ATTACHED |
FIB_ENTRY_FLAG_IMPORT)) at /home/elantsev/vpp/src/vnet/fib/fib_entry.c:674
#7 0x00007ffff7491a3c in fib_entry_post_install_actions
(fib_entry=0x7fffb4bd2dd0, source=FIB_SOURCE_DEFAULT_ROUTE,
old_flags=(FIB_ENTRY_FLAG_ATTACHED | FIB_ENTRY_FLAG_IMPORT))
at /home/elantsev/vpp/src/vnet/fib/fib_entry.c:709
#8 0x00007ffff7491d78 in fib_entry_post_update_actions
(fib_entry=0x7fffb4bd2dd0, source=FIB_SOURCE_DEFAULT_ROUTE,
old_flags=(FIB_ENTRY_FLAG_ATTACHED | FIB_ENTRY_FLAG_IMPORT))
at /home/elantsev/vpp/src/vnet/fib/fib_entry.c:804
#9 0x00007ffff74923f9 in fib_entry_source_removed (fib_entry=0x7fffb4bd2dd0,
old_flags=(FIB_ENTRY_FLAG_ATTACHED | FIB_ENTRY_FLAG_IMPORT)) at
/home/elantsev/vpp/src/vnet/fib/fib_entry.c:992
#10 0x00007ffff74925e7 in fib_entry_path_remove (fib_entry_index=7,
source=FIB_SOURCE_CLI, rpaths=0x7fffb83a3520) at
/home/elantsev/vpp/src/vnet/fib/fib_entry.c:1072
#11 0x00007ffff747980b in fib_table_entry_path_remove2 (fib_index=1,
prefix=0x7fffb8382b00, source=FIB_SOURCE_CLI, rpaths=0x7fffb83a3520) at
/home/elantsev/vpp/src/vnet/fib/fib_table.c:680
#12 0x00007ffff6fb870c in vnet_ip_route_cmd (vm=0x7ffff66b6680
<vlib_global_main>, main_input=0x7fffb8382f00, cmd=0x7fffb50373b8) at
/home/elantsev/vpp/src/vnet/ip/lookup.c:449
#13 0x00007ffff63d402f in vlib_cli_dispatch_sub_commands (vm=0x7ffff66b6680
<vlib_global_main>, cm=0x7ffff66b68b0 <vlib_global_main+560>,
input=0x7fffb8382f00, parent_command_index=431)
at /home/elantsev/vpp/src/vlib/cli.c:568
#14 0x00007ffff63d3ead in vlib_cli_dispatch_sub_commands (vm=0x7ffff66b6680
<vlib_global_main>, cm=0x7ffff66b68b0 <vlib_global_main+560>,
input=0x7fffb8382f00, parent_command_index=0)
at /home/elantsev/vpp/src/vlib/cli.c:528
#15 0x00007ffff63d4434 in vlib_cli_input (vm=0x7ffff66b6680 <vlib_global_main>,
input=0x7fffb8382f00, function=0x7ffff646dc89 <unix_vlib_cli_output>,
function_arg=0) at /home/elantsev/vpp/src/vlib/cli.c:667
#16 0x00007ffff647476d in unix_cli_process_input (cm=0x7ffff66b7020
<unix_cli_main>, cli_file_index=0) at
/home/elantsev/vpp/src/vlib/unix/cli.c:2572
#17 0x00007ffff647540e in unix_cli_process (vm=0x7ffff66b6680
<vlib_global_main>, rt=0x7fffb8342000, f=0x0) at
/home/elantsev/vpp/src/vlib/unix/cli.c:2688
#18 0x00007ffff64161d4 in vlib_process_bootstrap (_a=140736272894320) at
/home/elantsev/vpp/src/vlib/main.c:1475
#19 0x00007ffff5eccfbc in clib_calljmp () at
/home/elantsev/vpp/src/vppinfra/longjmp.S:123
#20 0x00007fffb78d8940 in ?? ()
#21 0x00007ffff64162dc in vlib_process_startup (vm=0x0, p=0x8, f=0x7ffff66b6680
<vlib_global_main>) at /home/elantsev/vpp/src/vlib/main.c:1497
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
#4 0x00007ffff5ead1b8 in _clib_error (how_to_die=2, function_name=0x0,
line_number=0, fmt=0x7ffff7743bb8 "%s:%d (%s) assertion `%s' fails") at
/home/elantsev/vpp/src/vppinfra/error.c:143
msg = 0x0
va = {{gp_offset = 48, fp_offset = 48, overflow_arg_area =
0x7fffb8382710, reg_save_area = 0x7fffb8382630}}
#5 0x00007ffff74cbbe0 in fib_attached_export_purge (fib_entry=0x7fffb4bd2dd0)
at /home/elantsev/vpp/src/vnet/fib/fib_attached_export.c:367
fed = 0x0
index = 0
import_index = 0x0
export_entry = 0x7fffb4bd2bd8
import = 0x7fffb818d9b8
export = 0x7fffb83a3620
fed = 0x7fffb83a3620
__FUNCTION__ = "fib_attached_export_purge"
#6 0x00007ffff74919de in fib_entry_post_flag_update_actions
(fib_entry=0x7fffb4bd2dd0, old_flags=(FIB_ENTRY_FLAG_ATTACHED |
FIB_ENTRY_FLAG_IMPORT)) at /home/elantsev/vpp/src/vnet/fib/fib_entry.c:674
fei = 7
is_import = 0
was_import = 16
is_attached = -146163533
was_attached = 32767
#7 0x00007ffff7491a3c in fib_entry_post_install_actions
(fib_entry=0x7fffb4bd2dd0, source=FIB_SOURCE_DEFAULT_ROUTE,
old_flags=(FIB_ENTRY_FLAG_ATTACHED | FIB_ENTRY_FLAG_IMPORT))
at /home/elantsev/vpp/src/vnet/fib/fib_entry.c:709
No locals.
#8 0x00007ffff7491d78 in fib_entry_post_update_actions
(fib_entry=0x7fffb4bd2dd0, source=FIB_SOURCE_DEFAULT_ROUTE,
old_flags=(FIB_ENTRY_FLAG_ATTACHED | FIB_ENTRY_FLAG_IMPORT))
at /home/elantsev/vpp/src/vnet/fib/fib_entry.c:804
bw_ctx = {fnbw_reason = FIB_NODE_BW_REASON_FLAG_EVALUATE, fnbw_flags =
FIB_NODE_BW_FLAG_NONE, fnbw_depth = 1}
#9 0x00007ffff74923f9 in fib_entry_source_removed (fib_entry=0x7fffb4bd2dd0,
old_flags=(FIB_ENTRY_FLAG_ATTACHED | FIB_ENTRY_FLAG_IMPORT)) at
/home/elantsev/vpp/src/vnet/fib/fib_entry.c:992
bsrc = 0x7fffb83a2df0
best_source = FIB_SOURCE_DEFAULT_ROUTE
#10 0x00007ffff74925e7 in fib_entry_path_remove (fib_entry_index=7,
source=FIB_SOURCE_CLI, rpaths=0x7fffb83a3520) at
/home/elantsev/vpp/src/vnet/fib/fib_entry.c:1072
sflag = FIB_ENTRY_SRC_FLAG_NONE
best_source = FIB_SOURCE_CLI
bflags = (FIB_ENTRY_FLAG_ATTACHED | FIB_ENTRY_FLAG_IMPORT)
fib_entry = 0x7fffb4bd2dd0
bsrc = 0x7fffb83a2df0
__FUNCTION__ = "fib_entry_path_remove"
```
Can you please provide some hints/fixes?
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