This is a follows up on my earlier report Patch 1/2 is the workaround I already linked. In short, SIGSEGV in bgp_show_proto_info() when prometheus-bird-exporter runs `show protocols all` every 30s under BGP churn (trace in previous mail). The patch drops the per bucket prefix count so the walk no longer derefs a stale bucket prefix slot (this is a very minimal workaround) Patch 2/2 is addressing SIGABRT from an out_limit counter underflow, please see trace below: ```console $ colmena exec --verbose --on butte,timah -- sudo coredumpctl list timah | butte | timah | TIME PID UID GID SIG COREFILE EXE SIZE timah | Wed 2026-06-03 01:50:12 UTC 1177 999 999 SIGABRT present /nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird 109.3M timah | Wed 2026-06-03 09:31:36 UTC 1429113 999 999 SIGABRT present /nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird 116M timah | Succeeded butte | TIME PID UID GID SIG COREFILE EXE SIZE butte | Wed 2026-06-03 07:49:46 UTC 1569499 993 991 SIGABRT present /nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird 124.2M butte | Wed 2026-06-03 08:09:28 UTC 1630583 993 991 SIGABRT present /nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird 120.2M butte | Wed 2026-06-03 08:14:44 UTC 1638833 993 991 SIGABRT present /nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird 119.9M butte | Wed 2026-06-03 08:40:10 UTC 1641543 993 991 SIGABRT present /nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird 121.6M butte | Wed 2026-06-03 08:49:22 UTC 1652085 993 991 SIGABRT present /nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird 120.1M butte | Wed 2026-06-03 10:37:51 UTC 1656139 993 991 SIGABRT present /nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird 125M butte | Succeeded | All done! ``` ```console $ sudo coredumpctl info PID: 1656139 (bird) UID: 993 (bird) GID: 991 (bird) Signal: 6 (ABRT) Timestamp: Wed 2026-06-03 10:37:05 UTC (2h 15min ago) Command Line: /nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird -c /etc/bird/bird.conf Executable: /nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird Control Group: /system.slice/bird.service Unit: bird.service Slice: system.slice Boot ID: dfa9f57ca76345e98c08abe21afcc0bd Machine ID: 7d543c30c6554cebbc9c4c6e94f78247 Hostname: butte Storage: /var/lib/systemd/coredump/core.bird.993.dfa9f57ca76345e98c08abe21afcc0bd.1656139.1780483025000000.zst (present) Size on Disk: 125M Message: Process 1656139 (bird) of user 993 dumped core. Module /nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird without build-id. Module libz.so.1 without build-id. Module libssh.so.4 without build-id. Stack trace of thread 1656139: #0 0x000079eb7089fdcc __pthread_kill_implementation (libc.so.6 + 0x9fdcc) #1 0x000079eb7084265e raise (libc.so.6 + 0x4265e) #2 0x000079eb70829350 abort (libc.so.6 + 0x29350) #3 0x0000595bc856aeca bug (/nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird + 0x13beca) #4 0x0000595bc84d9f85 limit_pop.part.0.lto_priv.0 (/nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird + 0xaaf85) #5 0x0000595bc84cc5e4 do_rt_notify (/nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird + 0x9d5e4) #6 0x0000595bc84ccbed rt_notify_basic (/nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird + 0x9dbed) #7 0x0000595bc84cd07b channel_notify_optimal_req (/nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird + 0x9e07b) #8 0x0000595bc84cd3c0 channel_notify_optimal (/nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird + 0x9e3c0) #9 0x0000595bc8492f35 ev_run_list_limited (/nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird + 0x63f35) #10 0x0000595bc8447001 main (/nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird + 0x18001) #11 0x000079eb7082b285 __libc_start_call_main (libc.so.6 + 0x2b285) #12 0x000079eb7082b338 __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x2b338) #13 0x0000595bc8447885 _start (/nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird + 0x18885) Stack trace of thread 1656141: #0 0x000079eb708a6922 __syscall_cancel_arch (libc.so.6 + 0xa6922) #1 0x000079eb7089a00c __internal_syscall_cancel (libc.so.6 + 0x9a00c) #2 0x000079eb7089a084 __syscall_cancel (libc.so.6 + 0x9a084) #3 0x000079eb7091778e __poll (libc.so.6 + 0x11778e) #4 0x0000595bc8566b3e bird_thread_main.lto_priv.0 (/nix/store/xyxkk8dfzz668lmksbb73rp5qzz88r2a-bird-3.3.0/bin/bird + 0x137b3e) #5 0x000079eb7089dd53 start_thread (libc.so.6 + 0x9dd53) #6 0x000079eb7092563c __clone3 (libc.so.6 + 0x12563c) ELF object binary architecture: AMD x86-64 ``` Yifei Sun (2): BGP: skip bgp_bucket_pending() in show proto info Table export: don't pop out_limit for a never-exported old route nest/rt-table.c | 4 ++++ proto/bgp/bgp.c | 10 ++++------ 2 files changed, 8 insertions(+), 6 deletions(-) -- 2.54.0