[VPP-21] VPP crashes when tap interface is deleted (with a IP6 or IP4 neighbor)

[vvalderrv]

Description

Program received signal SIGABRT, Aborted.

0x00007ffff5acc267 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55

55 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.

(gdb) bt

#0 0x00007ffff5acc267 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55

#1 0x00007ffff5acdeca in __GI_abort () at abort.c:89

#2 0x0000000000407914 in os_panic () at /home/otroan/src/vpp/build-data/../vpp/vnet/main.c:266

#3 0x00007ffff66ec978 in debugger () at /home/otroan/src/vpp/build-data/../vppinfra/vppinfra/error.c:81

#4 0x00007ffff66ecd88 in _clib_error (how_to_die=2, function_name=0x0, line_number=0, fmt=0x7ffff7272370 "%s:%d (%s) assertion `%s' fails")

at /home/otroan/src/vpp/build-data/../vppinfra/vppinfra/error.c:139

#5 0x00007ffff70a98fb in vnet_get_sw_interface (vnm=0x665980 <vnet_main>, sw_if_index=5)

at /home/otroan/src/vpp/build-data/../vnet/vnet/interface_funcs.h:49

#6 0x00007ffff70b307d in ip4_probe_neighbor (vm=0x665240 <vlib_global_main>, dst=0x7fffc53f949e, sw_if_index=5)

at /home/otroan/src/vpp/build-data/../vnet/vnet/ip/ip4_forward.c:2287

#7 0x000000000042e6f3 in resolver_process (vm=0x665240 <vlib_global_main>, rt=0x7fffc5684000, f=0x0) at /home/otroan/src/vpp/build-data/../vpp/api/api.c:704

#8 0x00007ffff753ebfd in vlib_process_bootstrap (_a=140736510655776) at /home/otroan/src/vpp/build-data/../vlib/vlib/main.c:1177

#9 0x00007ffff67016e0 in clib_calljmp () at /home/otroan/src/vpp/build-data/../vppinfra/vppinfra/longjmp.S:110

#10 0x00007fffc5b97cf0 in ?? ()

#11 0x00007ffff753ed27 in vlib_process_startup (vm=0x9858d0486e9ac100, p=0xffffffffffffffff, f=0x7fffc5684000)

at /home/otroan/src/vpp/build-data/../vlib/vlib/main.c:1201

#12 0x0000000000665358 in vlib_global_main ()

or with only IPv4

Program received signal SIGABRT, Aborted.

0x00007ffff5acc267 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55

55 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.

(gdb) bt

#0 0x00007ffff5acc267 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55

#1 0x00007ffff5acdeca in __GI_abort () at abort.c:89

#2 0x0000000000407914 in os_panic () at /home/otroan/src/vpp/build-data/../vpp/vnet/main.c:266

#3 0x00007ffff66ec978 in debugger () at /home/otroan/src/vpp/build-data/../vppinfra/vppinfra/error.c:81

#4 0x00007ffff66ecd88 in _clib_error (how_to_die=2, function_name=0x0, line_number=0, fmt=0x7ffff7272370 "%s:%d (%s) assertion `%s' fails")

at /home/otroan/src/vpp/build-data/../vppinfra/vppinfra/error.c:139

#5 0x00007ffff70a98fb in vnet_get_sw_interface (vnm=0x665980 <vnet_main>, sw_if_index=5)

at /home/otroan/src/vpp/build-data/../vnet/vnet/interface_funcs.h:49

#6 0x00007ffff70b307d in ip4_probe_neighbor (vm=0x665240 <vlib_global_main>, dst=0x7fffc54840da, sw_if_index=5)

at /home/otroan/src/vpp/build-data/../vnet/vnet/ip/ip4_forward.c:2287

#7 0x000000000042e6f3 in resolver_process (vm=0x665240 <vlib_global_main>, rt=0x7fffc5684000, f=0x0) at /home/otroan/src/vpp/build-data/../vpp/api/api.c:704

#8 0x00007ffff753ebfd in vlib_process_bootstrap (_a=140736510655776) at /home/otroan/src/vpp/build-data/../vlib/vlib/main.c:1177

#9 0x00007ffff67016e0 in clib_calljmp () at /home/otroan/src/vpp/build-data/../vppinfra/vppinfra/longjmp.S:110

#10 0x00007fffc5b97cf0 in ?? ()

#11 0x00007ffff753ed27 in vlib_process_startup (vm=0xa023438064492e00, p=0xffffffffffffffff, f=0x7fffc5684000)

at /home/otroan/src/vpp/build-data/../vlib/vlib/main.c:1201

#12 0x0000000000665358 in vlib_global_main ()

To reproduce, steps are something like:

r = vpp_papi.tap_connect(1, b'tap0\0', bytearray.fromhex('000000000000'), 0, 0)

r = vpp_papi.sw_interface_add_del_address(swifindex, is_add, is_ipv6, del_all, address_length, address)

r = vpp_papi.sw_interface_set_flags(swifindex, admin_up_down, link_up_down, deleted)

r = vpp_papi.ip_add_del_route(next_hop_sw_if_index, vrf_id, lookup_in_vrf, resolve_attempts, classify_table_index,

                          create_vrf_if_needed, resolve_if_needed, is_add, is_drop, is_ipv6, is_local,

                          is_classify, is_multipath, not_last, next_hop_weight, dst_address_length,

                          dst_address, next_hop_address)

r = vpp_papi.tap_delete(swifindex)

Where next-hop is out the TAP interface.

Assignee

Deepak jain

Reporter

Ole Trøan

Comments

• dbarach (Mon, 2 May 2016 19:40:00 +0000): This is a variation on an old theme: we don't keep track of routes by interface. A real fix is coming in the next release - ran out of time for 16.06 - in the meanwhile: shut down interfaces vs. deleting them, specifically so that xxx-interface-output will just drop traffic.

Original issue: https://jira.fd.io/browse/VPP-21

[vvalderrv]

This is a variation on an old theme: we don't keep track of routes by interface. A real fix is coming in the next release - ran out of time for 16.06 - in the meanwhile: shut down interfaces vs. deleting them, specifically so that xxx-interface-output will just drop traffic.