Hello, We are running few routers, all Slackware Linux, 64bit. The setup is like this: router A is a gateway for whole network, speaking BGP on the outside, OSPF on the inside. There are a few routers on the inside, let's say B, C, D, ..., all of them are OSPF neighbors to A and each other. Routers B, C, etc. are running bird 2.14. I wanted to upgrade bird on router A from 1.6 to 2.14. As soon as new bird started up on A, almost all of B, C, etc. started crashing. Today I started to look into this. I found out I messed up the configuration on router A, I didn't filter out all routes from BGP and all those prefixes (IPv4 only, ~100k) were exported to OSPF. The bird on router A handled it quite OK, but routers B, C, etc. segfaulted after few seconds of exporting all those prefixes to kernel. And that happened repeatedly after bird started again. And again.. In bird's log file I found nothing. In system log were 2 lines for each segfault: [Thu Feb 1 01:51:10 2024] bird[23724]: segfault at 7ffe0e092ff8 ip 00007f2c4fb219a7 sp 00007ffe0e093000 error 6 in libc-2.33.so[7f2c4fabe000+15e000] [Thu Feb 1 01:51:10 2024] Code: 48 89 d9 49 8b 7f 28 49 8b 5f 30 48 39 df 73 bf 48 29 fb 4c 39 f3 49 0f 47 de 48 83 fb 14 76 a3 48 89 ce 48 89 da 48 89 0c 24 <e8> f4 c8 f9 ff 48 8b 0c 24 49 89 47 28 48 01 d9 eb 90 0f 1f 80 00 I will try again to upgrade router A without all those prefixes exported to OSPF, that should work I believe. I am not good at this, but maybe someone could use this information to find a bug somewhere in bird. Maybe I can help and try something with the same failing setup? Thanks ico