installing frr deb causes core files to be generated at startup. Stacks follow:

bgpd

[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/bgpd --daemon -A 127.0.0.1'. Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007f1c0068723e in vty_log_fixed ( buf=buf@entry=0x7ffe94a98e09 "BGP: Received signal 11 at 1486365436 (si_addr 0x0, PC 0x7f1c006871a1); aborting...", len=len@entry=83) at vty.c:2572 2572 vty.c: No such file or directory. (gdb) bt #0 0x00007f1c0068723e in vty_log_fixed ( buf=buf@entry=0x7ffe94a98e09 "BGP: Received signal 11 at 1486365436 (si_addr 0x0, PC 0x7f1c006871a1); aborting...", len=len@entry=83) at vty.c:2572 #1 0x00007f1c006a10d5 in zlog_signal (signo=<optimized out>, action=action@entry=0x7f1c006c619b "aborting...", siginfo=<optimized out>, program_counter=0x7f1c006871a1 <vty_log+79>) at log.c:499 #2 0x00007f1c006ab9d0 in core_handler (signo=<optimized out>, siginfo=<optimized out>, context=<optimized out>) at sigevent.c:235 #3 <signal handler called> #4 vty_log (level=0x0, proto_str=proto_str@entry=0x7ffe94a99538 "BGP: ", format=format@entry=0x7f1c006c01ec "Assertion %s' failed in file %s, line %u, function %s",
ctl=ctl@entry=0x7ffe94a99558, va=va@entry=0x7ffe94a995d8) at vty.c:2543
#5 0x00007f1c006a0b3b in vzlog (zl=0x1441590, priority=,
format=0x7f1c006c01ec "Assertion %s' failed in file %s, line %u, function %s", args=args@entry=0x7ffe94a995d8) at log.c:260 #6 0x00007f1c006a12d9 in zlog (zl=zl@entry=0x0, priority=priority@entry=2, format=format@entry=0x7f1c006c01ec "Assertion %s' failed in file %s, line %u, function %s") at log.c:677
#7 0x00007f1c006a1809 in _zlog_assert_failed (assertion=assertion@entry=0x7f1c006c71d5 "mt->n_alloc",
file=file@entry=0x7f1c006c71cc "memory.c", line=line@entry=43,
function=function@entry=0x7f1c006c7268 <func.8042> "mt_count_free") at log.c:722
#8 0x00007f1c006836c3 in mt_count_free (mt=) at memory.c:43
#9 0x00007f1c006b19a2 in mt_count_free (mt=) at memory.c:87
#10 qfree (mt=, ptr=) at memory.c:89
#11 0x00007f1c00693151 in thread_master_free (m=0x143b120) at thread.c:523
#12 0x000000000041552d in bgp_exit (status=0) at bgp_main.c:309
#13 sigint () at bgp_main.c:225
#14 0x00007f1c006aba24 in quagga_sigevent_process () at sigevent.c:111
#15 0x00007f1c006936a1 in thread_fetch (m=0x143b120, fetch=fetch@entry=0x7ffe94a99850) at thread.c:1172
#16 0x0000000000414210 in main (argc=4, argv=0x7ffe94a999e8) at bgp_main.c:570
(gdb)

zebra:

Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by /usr/lib/frr/zebra -s 90000000 --daemon -A 127.0.0.1'. Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007f00649c923e in vty_log_fixed ( buf=buf@entry=0x7ffc42b88809 "ZEBRA: Received signal 11 at 1486365436 (si_addr 0x0, PC 0x7f00649c91a1); aborting...", len=len@entry=85) at vty.c:2572 2572 vty.c: No such file or directory. (gdb) bt #0 0x00007f00649c923e in vty_log_fixed ( buf=buf@entry=0x7ffc42b88809 "ZEBRA: Received signal 11 at 1486365436 (si_addr 0x0, PC 0x7f00649c91a1); aborting...", len=len@entry=85) at vty.c:2572 #1 0x00007f00649e30d5 in zlog_signal (signo=<optimized out>, action=action@entry=0x7f0064a0819b "aborting...", siginfo=<optimized out>, program_counter=0x7f00649c91a1 <vty_log+79>) at log.c:499 #2 0x00007f00649ed9d0 in core_handler (signo=<optimized out>, siginfo=<optimized out>, context=<optimized out>) at sigevent.c:235 #3 <signal handler called> #4 vty_log (level=0x0, proto_str=proto_str@entry=0x7ffc42b88f38 "ZEBRA: ", format=format@entry=0x7f0064a021ec "Assertion %s' failed in file %s, line %u, function %s",
ctl=ctl@entry=0x7ffc42b88f58, va=va@entry=0x7ffc42b88fd8) at vty.c:2543
#5 0x00007f00649e2b3b in vzlog (zl=0xce5040, priority=,
format=0x7f0064a021ec "Assertion %s' failed in file %s, line %u, function %s", args=args@entry=0x7ffc42b88fd8) at log.c:260 #6 0x00007f00649e32d9 in zlog (zl=zl@entry=0x0, priority=priority@entry=2, format=format@entry=0x7f0064a021ec "Assertion %s' failed in file %s, line %u, function %s") at log.c:677
#7 0x00007f00649e3809 in _zlog_assert_failed (assertion=assertion@entry=0x7f0064a091d5 "mt->n_alloc",
file=file@entry=0x7f0064a091cc "memory.c", line=line@entry=43,
function=function@entry=0x7f0064a09268 <func.8042> "mt_count_free") at log.c:722
#8 0x00007f00649c56c3 in mt_count_free (mt=) at memory.c:43
#9 0x00007f00649f39a2 in mt_count_free (mt=) at memory.c:87
#10 qfree (mt=, ptr=) at memory.c:89
#11 0x00007f00649d5151 in thread_master_free (m=0xce86e0) at thread.c:523
#12 0x00000000004105f6 in sigint () at main.c:228
#13 0x00007f00649eda24 in quagga_sigevent_process () at sigevent.c:111
#14 0x00007f00649d56a1 in thread_fetch (m=0xce86e0, fetch=fetch@entry=0x7ffc42b89280) at thread.c:1172
#15 0x000000000040ca64 in main (argc=6, argv=0x7ffc42b89418) at main.c:481
(gdb)

Showed to Donald and he thinks he knows the issue and suggested assigning to him.