(gdb) set pagination off
(gdb) bt full
#0  0x00007fba01e9caac in __pthread_kill_implementation ()
   from /nix/store/xx7cm72qy2c0643cm1ipngd87aqwkcdp-glibc-2.40-66/lib/libc.so.6
No symbol table info available.
#1  0x00007fba01e4190e in raise () from /nix/store/xx7cm72qy2c0643cm1ipngd87aqwkcdp-glibc-2.40-66/lib/libc.so.6
No symbol table info available.
#2  0x00007fba01e28942 in abort () from /nix/store/xx7cm72qy2c0643cm1ipngd87aqwkcdp-glibc-2.40-66/lib/libc.so.6
No symbol table info available.
#3  0x000056536f6ef97a in bug (msg=<optimized out>) at sysdep/unix/log.c:412
        args = {{gp_offset = 8, fp_offset = 48, overflow_arg_area = 0x7fff7fe3b670, reg_save_area = 0x7fff7fe3b5b0}}
#4  0x000056536f6fa9a1 in do_lock (dg=0x5653774ace60, lsp=0x7fba0208a2a8) at sysdep/unix/domain.c:116
        stack_copy = {the_bird = 0x56536f7a1700 <the_bird_domain_gen.lto_priv>, meta = 0x0, control = 0x0, proto = 0x0,
          service = 0x0, rtable = 0x5653774b9140, attrs = 0x0, logging = 0x0, resource = 0x0}
        lll = <optimized out>
        lock_begin = <optimized out>
        duration = <optimized out>
        wdw = <optimized out>
#5  0x000056536f64c8ac in if_find_by_index (idx=23) at nest/iface.c:721
        i = <optimized out>
#6  0x000056536f6e4ac8 in sockaddr_read6 (sa=0x5653774b9140, a=0x56537750ce10, ifa=0x56537750cdd8, port=0x56537750ce38)
    at sysdep/unix/io.c:583
No locals.
#7  sockaddr_read (sa=sa@entry=0x7fff7fe3b780, af=<optimized out>, a=a@entry=0x56537750cd98, ifa=ifa@entry=0x56537750cdd8,
    port=port@entry=0x56537750cdc0) at sysdep/unix/io.c:595
No locals.
#8  0x000056536f6ecfd7 in sk_passive_connected (s=0x56537760f790, type=<optimized out>) at sysdep/unix/io.c:1451
        loc_sa = {sa = {sa_family = 10, sa_data = "\000\263\000\000\000\000\376\200\000\000\000\000\000"},
          padding = "\000\000\000\000\000\0000\021\027\000\000\000SV\000"}
        rem_sa = {sa = {sa_family = 10, sa_data = "\263\223\000\000\000\000\376\200\000\000\000\000\000"},
          padding = "\000\000\000\000\000\000\0254\027\000\000\000\272\000\000"}
        loc_sa_len = 28
        rem_sa_len = 28
        fd = 22
        sock_lock = <optimized out>
        t = 0x56537750cd60
#9  0x000056536f618de2 in sk_read (s=<optimized out>, revents=<optimized out>) at sysdep/unix/io.c:2330
        e = <optimized out>
        e = <optimized out>
#10 io_loop () at sysdep/unix/io.c:2777
        s = <optimized out>
        count = 1
        timeout = <optimized out>
        pout = <optimized out>
        poll_tout = <optimized out>
        events = <optimized out>
        t = <optimized out>
        pfd = {pfd = {data = 0x5653775f9f70, used = 5, size = 16}, loop = {data = 0x5653775fa030, used = 5, size = 16}}
        poll_tout = <optimized out>
        timeout = <optimized out>
        events = <optimized out>
        pout = <optimized out>
        t = <optimized out>
        pfd = <optimized out>
        next2 = <optimized out>
        count = <optimized out>
        _orig = <optimized out>
        _ptr = <optimized out>
        _ = <optimized out>
        s = <optimized out>
        e = <optimized out>
        steps = <optimized out>
        _orig = <optimized out>
        _ptr = <optimized out>
        _ = <optimized out>
        s = <optimized out>
#11 main (argc=<optimized out>, argv=<optimized out>) at sysdep/unix/main.c:1106
        use_uid = <optimized out>
        use_gid = <optimized out>
        conf = <optimized out>
(gdb) thread apply all bt full

Thread 3 (Thread 0x7fba015ff6c0 (LWP 857837)):
#0  0x00007fba01f1443d in poll () from /nix/store/xx7cm72qy2c0643cm1ipngd87aqwkcdp-glibc-2.40-66/lib/libc.so.6
No symbol table info available.
#1  0x000056536f6f669e in poll (__fds=<optimized out>, __nfds=<optimized out>, __timeout=<optimized out>, __fds=<optimized out>, __nfds=<optimized out>, __timeout=<optimized out>) at /nix/store/gi4cz4ir3zlwhf1azqfgxqdnczfrwsr7-glibc-2.40-66-dev/include/bits/poll2.h:44
No locals.
#2  bird_thread_main (arg=0x5653775fa520) at sysdep/unix/io-loop.c:1013
        thr_loop_start = <optimized out>
        timeout = 2794
        thr_before_run = <optimized out>
        idle_force = <optimized out>
        busy_now = <optimized out>
        rv = <optimized out>
        __atomic_load_ptr = <optimized out>
        __atomic_load_ptr = <optimized out>
        loop = <optimized out>
        __atomic_load_ptr = <optimized out>
        __atomic_load_ptr = <optimized out>
        __atomic_load_tmp = <optimized out>
        __atomic_load_tmp = <optimized out>
        __atomic_load_tmp = <optimized out>
        __atomic_load_tmp = <optimized out>
        more_events = <optimized out>
        thr = 0x5653775fa520
        pfd = {pfd = {data = 0x5653775fc420, used = 3, size = 16}, loop = {data = 0x5653775fc4e0, used = 3, size = 16}}
#3  0x00007fba01e9a97a in start_thread () from /nix/store/xx7cm72qy2c0643cm1ipngd87aqwkcdp-glibc-2.40-66/lib/libc.so.6
No symbol table info available.
#4  0x00007fba01f22d2c in __clone3 () from /nix/store/xx7cm72qy2c0643cm1ipngd87aqwkcdp-glibc-2.40-66/lib/libc.so.6
No symbol table info available.

Thread 2 (Thread 0x7fba00dfe6c0 (LWP 857838)):
#0  0x00007fba01f1443d in poll () from /nix/store/xx7cm72qy2c0643cm1ipngd87aqwkcdp-glibc-2.40-66/lib/libc.so.6
No symbol table info available.
#1  0x000056536f6f669e in poll (__fds=<optimized out>, __nfds=<optimized out>, __timeout=<optimized out>, __fds=<optimized out>, __nfds=<optimized out>, __timeout=<optimized out>) at /nix/store/gi4cz4ir3zlwhf1azqfgxqdnczfrwsr7-glibc-2.40-66-dev/include/bits/poll2.h:44
No locals.
#2  bird_thread_main (arg=0x5653775fad10) at sysdep/unix/io-loop.c:1013
        thr_loop_start = <optimized out>
        timeout = -1
        thr_before_run = <optimized out>
        idle_force = <optimized out>
        busy_now = <optimized out>
        rv = <optimized out>
        __atomic_load_ptr = <optimized out>
        __atomic_load_ptr = <optimized out>
        loop = <optimized out>
        __atomic_load_ptr = <optimized out>
        __atomic_load_ptr = <optimized out>
        __atomic_load_tmp = <optimized out>
        __atomic_load_tmp = <optimized out>
        __atomic_load_tmp = <optimized out>
        __atomic_load_tmp = <optimized out>
        more_events = <optimized out>
        thr = 0x5653775fad10
        pfd = {pfd = {data = 0x56537760dc30, used = 5, size = 16}, loop = {data = 0x56537760dcf0, used = 5, size = 16}}
#3  0x00007fba01e9a97a in start_thread () from /nix/store/xx7cm72qy2c0643cm1ipngd87aqwkcdp-glibc-2.40-66/lib/libc.so.6
No symbol table info available.
#4  0x00007fba01f22d2c in __clone3 () from /nix/store/xx7cm72qy2c0643cm1ipngd87aqwkcdp-glibc-2.40-66/lib/libc.so.6
No symbol table info available.

Thread 1 (Thread 0x7fba0208adc0 (LWP 857835)):
#0  0x00007fba01e9caac in __pthread_kill_implementation () from /nix/store/xx7cm72qy2c0643cm1ipngd87aqwkcdp-glibc-2.40-66/lib/libc.so.6
No symbol table info available.
#1  0x00007fba01e4190e in raise () from /nix/store/xx7cm72qy2c0643cm1ipngd87aqwkcdp-glibc-2.40-66/lib/libc.so.6
No symbol table info available.
#2  0x00007fba01e28942 in abort () from /nix/store/xx7cm72qy2c0643cm1ipngd87aqwkcdp-glibc-2.40-66/lib/libc.so.6
No symbol table info available.
#3  0x000056536f6ef97a in bug (msg=<optimized out>) at sysdep/unix/log.c:412
        args = {{gp_offset = 8, fp_offset = 48, overflow_arg_area = 0x7fff7fe3b670, reg_save_area = 0x7fff7fe3b5b0}}
#4  0x000056536f6fa9a1 in do_lock (dg=0x5653774ace60, lsp=0x7fba0208a2a8) at sysdep/unix/domain.c:116
        stack_copy = {the_bird = 0x56536f7a1700 <the_bird_domain_gen.lto_priv>, meta = 0x0, control = 0x0, proto = 0x0, service = 0x0, rtable = 0x5653774b9140, attrs = 0x0, logging = 0x0, resource = 0x0}
        lll = <optimized out>
        lock_begin = <optimized out>
        duration = <optimized out>
        wdw = <optimized out>
#5  0x000056536f64c8ac in if_find_by_index (idx=23) at nest/iface.c:721
        i = <optimized out>
#6  0x000056536f6e4ac8 in sockaddr_read6 (sa=0x5653774b9140, a=0x56537750ce10, ifa=0x56537750cdd8, port=0x56537750ce38) at sysdep/unix/io.c:583
No locals.
#7  sockaddr_read (sa=sa@entry=0x7fff7fe3b780, af=<optimized out>, a=a@entry=0x56537750cd98, ifa=ifa@entry=0x56537750cdd8, port=port@entry=0x56537750cdc0) at sysdep/unix/io.c:595
No locals.
#8  0x000056536f6ecfd7 in sk_passive_connected (s=0x56537760f790, type=<optimized out>) at sysdep/unix/io.c:1451
        loc_sa = {sa = {sa_family = 10, sa_data = "\000\263\000\000\000\000\376\200\000\000\000\000\000"}, padding = "\000\000\000\000\000\0000\021\027\000\000\000SV\000"}
        rem_sa = {sa = {sa_family = 10, sa_data = "\263\223\000\000\000\000\376\200\000\000\000\000\000"}, padding = "\000\000\000\000\000\000\0254\027\000\000\000\272\000\000"}
        loc_sa_len = 28
        rem_sa_len = 28
        fd = 22
        sock_lock = <optimized out>
        t = 0x56537750cd60
#9  0x000056536f618de2 in sk_read (s=<optimized out>, revents=<optimized out>) at sysdep/unix/io.c:2330
        e = <optimized out>
        e = <optimized out>
#10 io_loop () at sysdep/unix/io.c:2777
        s = <optimized out>
        count = 1
        timeout = <optimized out>
        pout = <optimized out>
        poll_tout = <optimized out>
        events = <optimized out>
        t = <optimized out>
        pfd = {pfd = {data = 0x5653775f9f70, used = 5, size = 16}, loop = {data = 0x5653775fa030, used = 5, size = 16}}
        poll_tout = <optimized out>
        timeout = <optimized out>
        events = <optimized out>
        pout = <optimized out>
        t = <optimized out>
        pfd = <optimized out>
        next2 = <optimized out>
        count = <optimized out>
        _orig = <optimized out>
        _ptr = <optimized out>
        _ = <optimized out>
        s = <optimized out>
        e = <optimized out>
        steps = <optimized out>
        _orig = <optimized out>
        _ptr = <optimized out>
        _ = <optimized out>
        s = <optimized out>
#11 main (argc=<optimized out>, argv=<optimized out>) at sysdep/unix/main.c:1106
        use_uid = <optimized out>
        use_gid = <optimized out>
        conf = <optimized out>
(gdb) quit