nhrpd crash on unconfig of nhrp event socket

[anithanarasimhamurthy]

Crash decode -

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/lib/frr/nhrpd --daemon -A 127.0.0.1'.
Program terminated with signal SIGABRT, Aborted.
#0 0x00007ffad3c52067 in raise () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0 0x00007ffad3c52067 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007ffad3c53448 in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007ffad50b72fc in core_handler (signo=11, siginfo=0x7ffc00e0ebb0, context=0x7ffc00e0ea80) at sigevent.c:256
#3
#4 0x00007ffad3c9ec3a in strlen () from /lib/x86_64-linux-gnu/libc.so.6
#5 0x00007ffad3c9e97e in strdup () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000562d43857eba in evmgr_set_socket (socket=socket@entry=0x0) at nhrp_event.c:220
#7 0x0000562d4385f584 in no_nhrp_event_socket (self=, vty=, argc=,
argv=) at nhrp_vty.c:223
#8 0x00007ffad5097cf1 in cmd_execute_command_real (vline=vline@entry=0x562d44afea10, vty=vty@entry=0x562d44b08c70,
cmd=cmd@entry=0x0, filter=FILTER_RELAXED) at command.c:956
#9 0x00007ffad509994a in cmd_execute_command (vline=vline@entry=0x562d44afea10, vty=vty@entry=0x562d44b08c70,
cmd=cmd@entry=0x0, vtysh=vtysh@entry=0) at command.c:1010
#10 0x00007ffad509069b in vty_command (vty=vty@entry=0x562d44b08c70, buf=0x562d44b06260 "no nhrp event socket SOCKET")
at vty.c:457
#11 0x00007ffad509092f in vty_execute (vty=vty@entry=0x562d44b08c70) at vty.c:1367
#12 0x00007ffad5091a88 in vtysh_read (thread=) at vty.c:2190
#13 0x00007ffad509dbea in thread_call (thread=thread@entry=0x7ffc00e11598) at thread.c:1480
#14 0x00007ffad50c2653 in frr_run (master=0x562d44a8de30) at libfrr.c:441
#15 0x0000562d438541b3 in main (argc=, argv=0x7ffc00e117a8) at nhrp_main.c:150
(gdb)

switch(config)# no nhrp event socket SOCKET
vtysh: error reading from nhrpd: Success (0)Warning: closing connection to nhrpd because of an I/O error!
switch(config)#

[donaldsharp]

Fixed in #571