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October 2025

15 participants
12 discussions

BIRD Crash when reconfiguring with a change to direct protocols
by Maiyun Zhang 01 Oct '25

01 Oct '25

Dear BIRD Developers, I saw two BIRD crashes today. This happened when I was running birdc configure with a change to the list of interfaces in a direct protocol. I have the core dump files if they might be helpful. Sep 29 21:57:59 hostname1 bird[8950]: Restarting protocol direct1 Sep 29 21:57:59 hostname1 bird[8950]: Trying to lock in a bad order: 0000ffffe7488368 0000ffff8f8da858 Sep 29 21:57:59 hostname1 systemd[1]: Started Process Core Dump (PID 9765/UID 0). Sep 29 21:58:07 hostname1 systemd-coredump[9766]: [🡕] Process 8950 (bird) of user 980 dumped core. Stack trace of thread 8950: #0 0x0000ffff8f77f7f8 __pthread_kill_implementation (libc.so.6 + 0x827f8) #1 0x0000ffff8f737b3c raise (libc.so.6 + 0x3ab3c) #2 0x0000ffff8f724074 abort (libc.so.6 + 0x27074) #3 0x00000000004badf8 bug (bird + 0xbadf8) #4 0x00000000004ba5b8 do_lock (bird + 0xba5b8) #5 0x000000000045056c rte_import (bird + 0x5056c) #6 0x0000000000463cc4 babel_retract_route (bird + 0x63cc4) #7 0x0000000000463d30 babel_remove_iface (bird + 0x63d30) #8 0x0000000000468074 babel_reconfigure_ifaces (bird + 0x68074) #9 0x000000000043d254 proto_reconfigure (bird + 0x3d254) #10 0x000000000040f548 protos_commit (bird + 0xf548) #11 0x0000000000410474 config_commit (bird + 0x10474) #12 0x00000000004c0b80 cmd_reconfig (bird + 0xc0b80) #13 0x00000000004db6f4 cf_parse.isra.0 (bird + 0xdb6f4) #14 0x0000000000409b44 cli_parse (bird + 0x9b44) #15 0x0000000000435700 cli_command (bird + 0x35700) #16 0x0000000000435904 cli_event (bird + 0x35904) #17 0x00000000004259bc ev_run_list_limited (bird + 0x259bc) #18 0x0000000000403f20 io_loop (bird + 0x3f20) #19 0x0000ffff8f724340 __libc_start_call_main (libc.so.6 + 0x27340) #20 0x0000ffff8f724418 __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x27418) #21 0x00000000004047f0 _start (bird + 0x47f0) Stack trace of thread 8951: #0 0x0000ffff8f7ddf60 __poll (libc.so.6 + 0xe0f60) #1 0x00000000004b6a88 bird_thread_main (bird + 0xb6a88) #2 0x0000ffff8f77db50 start_thread (libc.so.6 + 0x80b50) #3 0x0000ffff8f7e81dc thread_start (libc.so.6 + 0xeb1dc) ELF object binary architecture: AARCH64 Sep 29 21:39:15 hostname2 bird[2067]: Reconfiguring Sep 29 21:39:15 hostname2 bird[2067]: Restarting protocol direct1 Sep 29 21:39:15 hostname2 bird[2067]: Trying to lock in a bad order: 0000ffffc2cc0df8 0000ffff990c8858 Sep 29 21:39:15 hostname2 systemd[1]: Created slice Slice /system/systemd-coredump. Sep 29 21:39:15 hostname2 systemd[1]: Started Process Core Dump (PID 3975/UID 0). Sep 29 21:39:15 hostname2 systemd-coredump[3976]: [🡕] Process 2067 (bird) of user 981 dumped core. Stack trace of thread 2067: #0 0x0000ffff98f707f8 __pthread_kill_implementation (libc.so.6 + 0x827f8) #1 0x0000ffff98f28b3c raise (libc.so.6 + 0x3ab3c) #2 0x0000ffff98f15074 abort (libc.so.6 + 0x27074) #3 0x00000000004bb488 bug (bird + 0xbb488) #4 0x00000000004bac48 do_lock (bird + 0xbac48) #5 0x000000000042d080 olock_free (bird + 0x2d080) #6 0x000000000042313c pool_free (bird + 0x2313c) #7 0x000000000042a67c rfree (bird + 0x2a67c) #8 0x00000000004680a4 babel_reconfigure_ifaces (bird + 0x680a4) #9 0x000000000043d284 proto_reconfigure (bird + 0x3d284) #10 0x000000000040f548 protos_commit (bird + 0xf548) #11 0x00000000004104a4 config_commit (bird + 0x104a4) #12 0x00000000004c1210 cmd_reconfig (bird + 0xc1210) #13 0x00000000004dbd84 cf_parse.isra.0 (bird + 0xdbd84) #14 0x0000000000409b44 cli_parse (bird + 0x9b44) #15 0x0000000000435730 cli_command (bird + 0x35730) #16 0x0000000000435934 cli_event (bird + 0x35934) #17 0x00000000004259ec ev_run_list_limited (bird + 0x259ec) #18 0x0000000000403f20 io_loop (bird + 0x3f20) #19 0x0000ffff98f15340 __libc_start_call_main (libc.so.6 + 0x27340) #20 0x0000ffff98f15418 __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x27418) #21 0x00000000004047f0 _start (bird + 0x47f0) Stack trace of thread 2078: #0 0x0000ffff98fcef60 __poll (libc.so.6 + 0xe0f60) #1 0x00000000004b7118 bird_thread_main (bird + 0xb7118) #2 0x0000ffff98f6eb50 start_thread (libc.so.6 + 0x80b50) #3 0x0000ffff98fd91dc thread_start (libc.so.6 + 0xeb1dc) ELF object binary architecture: AARCH64 Thank you! Best, Maiyun Zhang (he/him)

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bird & pthreads
by Alexander Zubkov 01 Oct '25

01 Oct '25

Hi all! I've accidentally found a "mistake" in lib/timer.c (master branch). Mistake in quotes, because it is rather a configuration mistake, as I found later. There is a function prototype definition inside "#ifdef USE_PTHREADS", which is then used outside of it, but in "#ifdef CONFIG_BFD": #ifdef USE_PTHREADS ... void wakeup_kick_current(void); #else ... #endif ... void tm_set(timer *t, btime when) { ... #ifdef CONFIG_BFD /* Hack to notify BFD loops */ if ((loop != &main_timeloop) && (t->index == 1)) wakeup_kick_current(); #endif } So in case USE_PTHREADS is not defined and CONFIG_BFD is defined, the compilation would fail with implicit function declaration error. It could be reproduced with: ./configure --disable-pthreads --with-protocols=bfd make ... lib/timer.c: In function 'tm_set': lib/timer.c:165:5: error: implicit declaration of function 'wakeup_kick_current' [-Wimplicit-function-declaration] 165 | wakeup_kick_current(); | ^~~~~~~~~~~~~~~~~~~ make: *** [Makefile:115: obj/lib/timer.o] Error 1 But even moving that function prototype out of "#ifdef USE_PTHREADS" does not help. It then fails on proto/bfd/io.c using undefined references, because it uses pthreads unconditionally. I think it would be better to fail on "configure" stage with a meaningful message that bfd requires pthreads. I see there is now only a workaround to exclude bfd from the default set of protocols if pthreads is not enabled. I've made some patch that shows an error if bfd is enabled and pthreads support is disabled. Regards, Alexander Zubkov

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