(gdb) 
#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=136763135739456) at ./nptl/pthread_kill.c:44
#1  __pthread_kill_internal (signo=6, threadid=136763135739456) at ./nptl/pthread_kill.c:78
#2  __GI___pthread_kill (threadid=136763135739456, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3  0x00007c62a7e42476 in __GI_raise (sig=6) at ../sysdeps/posix/raise.c:26
#4  0x00007c62a8b382b8 in core_handler (signo=6, siginfo=0x7c62a61f9f70, context=0x7c62a61f9e40) at lib/sigevent.c:248
#5  <signal handler called>
#6  __pthread_kill_implementation (no_tid=0, signo=6, threadid=136763135739456) at ./nptl/pthread_kill.c:44
#7  __pthread_kill_internal (signo=6, threadid=136763135739456) at ./nptl/pthread_kill.c:78
#8  __GI___pthread_kill (threadid=136763135739456, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#9  0x00007c62a7e42476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#10 0x00007c62a7e287f3 in __GI_abort () at ./stdlib/abort.c:79
#11 0x00007c62a8b7cf45 in _zlog_assert_failed (xref=0x7c62a8c214a0 <rcu_read_lock._xref>, extra=0x0) at lib/zlog.c:670
#12 0x00007c62a8ab80d6 in rcu_read_lock () at lib/frrcu.c:294
#13 0x00007c62a8b7c8ee in vzlog_notls (xref=0x0, prio=2, fmt=0x7c62a8bc4fbb "%s:%d: %s(): assertion (%s) failed", ap=0x7c62a61fb250) at lib/zlog.c:425
#14 0x00007c62a8b7c58c in vzlogx (xref=0x0, prio=2, fmt=0x7c62a8bc4fbb "%s:%d: %s(): assertion (%s) failed", ap=0x7c62a61fb250) at lib/zlog.c:627
#15 0x00007c62a8b7d0a4 in zlog (prio=2, fmt=0x7c62a8bc4fbb "%s:%d: %s(): assertion (%s) failed") at ./lib/zlog.h:73
#16 0x00007c62a8b7d000 in _zlog_assert_failed (xref=0x7c62a8c214a0 <rcu_read_lock._xref>, extra=0x0) at lib/zlog.c:687
#17 0x00007c62a8ab80d6 in rcu_read_lock () at lib/frrcu.c:294
#18 0x00007c62a8b7c8ee in vzlog_notls (xref=0x7c62a8da42c0 <rpki_create_socket._xref>, prio=3, fmt=0x7c62a8d9ee95 "getaddrinfo: %s", ap=0x7c62a61fb890)
    at lib/zlog.c:425
#19 0x00007c62a8b7c58c in vzlogx (xref=0x7c62a8da42c0 <rpki_create_socket._xref>, prio=3, fmt=0x7c62a8d9ee95 "getaddrinfo: %s", ap=0x7c62a61fb890) at lib/zlog.c:627
#20 0x00007c62a8d952e5 in zlog_ref (xref=0x7c62a8da42c0 <rpki_create_socket._xref>, fmt=0x7c62a8d9ee95 "getaddrinfo: %s") at ./lib/zlog.h:84
#21 0x00007c62a8d98dba in rpki_create_socket (_cache=0x5dba80cf8570) at bgpd/bgp_rpki.c:1337
#22 0x00007c62a80ea643 in ?? () from /lib/x86_64-linux-gnu/librtr.so.0
#23 0x00007c62a80eaf69 in ?? () from /lib/x86_64-linux-gnu/librtr.so.0
#24 0x00007c62a7e94ac3 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
#25 0x00007c62a7f26850 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
(gdb) ```

Bisect of the code base leads us to:

bgpd: fix res validity in rpki_create_socket

Fix coverity scanner issue 1575912 where res pointer is supposed to
valid in:

> socket = vrf_socket(res->ai_family, ...)

but is checked for validity a few lines later.

Note that vrf_getaddrinfo returns an error code if getaddrinfo() fails
to allocate res and in this case, rpki_create_socket() returns.

Fixes: a951752 ("bgpd: create cache server socket in vrf")
Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>```