hello, I'm running bird git-master config (OSPF +BFD): ------------------------ log "/var/log/bird.log" all; debug protocols all; router id X.X.X.X; filter deny_default { if net = 0.0.0.0/0 then reject; else accept; } filter permit_white { if net ~ [ X.X.X.X/32 ,X.X.X.X/32,X.X.X.X/32 ] then accept; else reject; } filter permit_internal { if net ~ [ X.X.X.X/32 ] then accept; else reject; } filter change_src { if net = 0.0.0.0/0 then { krt_prefsrc = X.X.X.X; accept; } else accept; } protocol direct { interface "*"; ipv4; } protocol kernel { scan time 20; ipv4 { import all; export filter change_src; }; } protocol device { scan time 10; } protocol ospf External { rfc1583compat yes; ipv4 { import all; export filter permit_white; }; area 100.0.0.0 { interface "eno1.1498" { type pointopoint; authentication cryptographic; password "XXX"; bfd yes; }; interface "eno2.1500" { type pointopoint; authentication cryptographic; password "XXX"; bfd yes; }; }; } protocol ospf Internal1 { rfc1583compat yes; ipv4 { import filter deny_default; export filter permit_internal; }; area 0.0.0.20 { interface "eno1.1497" { type pointopoint; authentication cryptographic; password "XXX"; bfd yes; }; }; } protocol ospf Internal2 { rfc1583compat yes; ipv4 { import filter deny_default; export filter permit_internal; }; area 0.0.0.20 { interface "eno2.1499" { type pointopoint; authentication cryptographic; password "XXX"; bfd yes; }; }; } protocol bfd bfd_proto { interface "eno1.1497" { interval 50ms; idle tx interval 2s; multiplier 3; authentication keyed sha1; password "XXX"; }; interface "eno1.1498" { interval 50ms; idle tx interval 2s; multiplier 3; authentication keyed sha1; password "XXX"; }; interface "eno2.1500" { interval 50ms; idle tx interval 2s; multiplier 3; authentication keyed sha1; password "XXX"; }; interface "eno2.1499" { interval 50ms; idle tx interval 2s; multiplier 3; authentication keyed sha1; password "XXX"; }; } ---------------------- on SIGHUP sometimes bird crashes (gdb) bt #0 _IO_vfprintf_internal (s=0x0, format=0x4ddaf9 "%s <%s> ", ap=ap@entry=0x7f9954af06d8) at vfprintf.c:1271 #1 0x00007f9954b45287 in __fprintf (stream=<optimized out>, format=<optimized out>) at fprintf.c:32 #2 0x000000000040352b in log_commit (class=2, buf=0x7f9954af0ce0) at sysdep/unix/log.c:192 #3 0x000000000040368d in vlog (class=2, msg=0x4e5c1a "%s: Sending CTL to %I [%s%s]", args=0x7f9954af0d20) at sysdep/unix/log.c:220 #4 0x0000000000403764 in log_msg (msg=0x4e5c1a "%s: Sending CTL to %I [%s%s]") at sysdep/unix/log.c:244 #5 0x000000000045d2be in bfd_send_ctl (p=0x25bf510, s=0x25f5028, final=0) at proto/bfd/packets.c:315 #6 0x0000000000466086 in bfd_tx_timer_hook (t=0x25f6010) at proto/bfd/bfd.c:387 #7 0x000000000047b1ce in timers_fire (loop=0x25e1c58) at lib/timer.c:235 #8 0x000000000045c956 in birdloop_main (arg=0x25e1c10) at proto/bfd/io.c:526 #9 0x00007f9954ec6dd5 in start_thread (arg=0x7f9954af1700) at pthread_create.c:307 #10 0x00007f9954befead in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111 (gdb) in case someone interested, please have a look cheers, Ilya Shipitsin