[VPP-1930] Crash when configured nat with gre interface

[vvalderrv]

Description

version : vpp master

vpp configuration:

 G0 ip 192.168.102.151

 create gre tunnel src 192.168.102.151 dst 192.168.100.174

 set interface stat gre0 up

 set interface ip addr gre0 8.8.8.1/30

 set interface nat44 out gre0 output-feature

linux configuration:

 ip: 192.168.100.174

 ip tunnel add mode gre remote 192.168.102.151 local 192.168.100.174 

 ifconfig gre0 8.8.8.2/30 up

after configuration, ping 8.8.8.1 then crash

DBGvpp# 2: /root/work/vpp-master/src/vnet/config.h:130 (vnet_get_config_data) assertion ` < vec_len (cm->config_string_heap)' fails

 

Program received signal SIGABRT, Aborted.

[Switching to Thread 0x7fff3bfff700 (LWP 45893)]

0x00007ffff5478387 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:55

55        return INLINE_SYSCALL (tgkill, 3, pid, selftid, sig);

Missing separate debuginfos, use: debuginfo-install krb5-libs-1.15.1-37.el7_7.2.x86_64 libcom_err-1.42.9-16.el7.x86_64 mbedtls-2.7.16-2.el7.x86_64 pkcs11-helper-1.11-3.el7.x86_64

it's bt info

(gdb) bt

#0  0x00007ffff5478387 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:55

#1  0x00007ffff5479a78 in __GI_abort () at abort.c:90

#2  0x000000000040858e in os_panic () at /root/work/vpp-master/src/vpp/vnet/main.c:371

#3  0x00007ffff6219aa6 in debugger () at /root/work/vpp-master/src/vppinfra/error.c:84

#4  0x00007ffff6219e91 in _clib_error (how_to_die=2, function_name=0x0, line_number=0, 

    fmt=0x7fffaff78e80 "%s:%d (%s) assertion `%s' fails") at /root/work/vpp-master/src/vppinfra/error.c:143

#5  0x00007fffafdffd32 in vnet_get_config_data (cm=0x7fffb44f03e0, config_index=0x1002492e94, 

    next_index=0x1002492ed8, n_data_bytes=0) at /root/work/vpp-master/src/vnet/config.h:130

#6  0x00007fffafe00007 in vnet_feature_next_with_data (next0=0x1002492ed8, b0=0x1002492e80, n_data_bytes=0)

    at /root/work/vpp-master/src/vnet/feature/feature.h:316

#7  0x00007fffafe00031 in vnet_feature_next (next0=0x1002492ed8, b0=0x1002492e80)

    at /root/work/vpp-master/src/vnet/feature/feature.h:324

#8  0x00007fffafe076eb in nat44_ed_in2out_fast_path_node_fn_inline (vm=0x7fffb4b667c0, node=0x7fffb530c540, 

    frame=0x7fffb531c7c0, is_output_feature=1) at /root/work/vpp-master/src/plugins/nat/in2out_ed.c:967

#9  0x00007fffafe095af in nat44_ed_in2out_output_node_fn_hsw (vm=0x7fffb4b667c0, node=0x7fffb530c540, 

    frame=0x7fffb531c7c0) at /root/work/vpp-master/src/plugins/nat/in2out_ed.c:1515

#10 0x00007ffff7edfc3f in dispatch_node (vm=0x7fffb4b667c0, node=0x7fffb530c540, type=VLIB_NODE_TYPE_INTERNAL, 

    dispatch_state=VLIB_NODE_STATE_POLLING, frame=0x7fffb531c7c0, last_time_stamp=1085510887320845)

    at /root/work/vpp-master/src/vlib/main.c:1194

#11 0x00007ffff7ee0349 in dispatch_pending_node (vm=0x7fffb4b667c0, pending_frame_index=0, 

    last_time_stamp=1085510887320845) at /root/work/vpp-master/src/vlib/main.c:1353

#12 0x00007ffff7ee2395 in vlib_main_or_worker_loop (vm=0x7fffb4b667c0, is_main=0)

    at /root/work/vpp-master/src/vlib/main.c:1848

#13 0x00007ffff7ee2e17 in vlib_worker_loop (vm=0x7fffb4b667c0) at /root/work/vpp-master/src/vlib/main.c:1982

#14 0x00007ffff7f23b55 in vlib_worker_thread_fn (arg=0x7fffb6a77e80)

    at /root/work/vpp-master/src/vlib/threads.c:1814

#15 0x00007ffff6238870 in clib_calljmp () at /root/work/vpp-master/src/vppinfra/longjmp.S:123

#16 0x00007fff3bffebb0 in ?? ()

#17 0x00007ffff7f1da47 in vlib_worker_thread_bootstrap_fn (arg=0x7fffb6a77e80)

    at /root/work/vpp-master/src/vlib/threads.c:585

Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Assignee

Filip Varga

Reporter

Filip Varga

Comments

• fivarga89 (Thu, 1 Oct 2020 12:07:22 +0000): Done by community member. Resolution was adding parent node based on the concept of pre-nodes in NAT plugin to the output-feature node.

Original issue: https://jira.fd.io/browse/VPP-1930

[vvalderrv]

Done by community member. Resolution was adding parent node based on the concept of pre-nodes in NAT plugin to the output-feature node.