BIRD 3.0alpha2

[Daniel Suchy]

Hello,
when I'm using prebuilt packages from your CI [1], I noticed issue with 
Bird 3.0alpha2 startup using provided systemd unit, but only when BFD 
protocol is enabled (but, for example BGP or static protocols weren't 
affected). This isn't happening with version 2.13 [2], which uses 
similar unit file.

When BFD is enabled, v 3.0 daemon terminates on:
[pid 55564] write(14</var/log/bird/bird.log>, "2023-05-13 13:00:03.281 
[0001] <TRACE> bfd1: Initializing\n", 58)                  = 58
[pid 55564] write(14</var/log/bird/bird.log>, "2023-05-13 13:00:03.281 
[0001] <TRACE> bfd1: Starting\n", 54)                      = 54
[pid 55564] write(0</dev/null<char 1:3>>, "\1", 1) = -1 EBADF (Bad file 
descriptor)
[pid 55564] write(14</var/log/bird/bird.log>, "2023-05-13 13:00:03.281 
[0001] <BUG> wakeup write: Bad file descriptor\n", 71)     = 71
[pid 55564] --- SIGABRT {si_signo=SIGABRT, si_code=SI_TKILL, 
si_pid=55564, si_uid=101} ---

This is hapenning only when systemd unit starts bird with "-f" 
(foreground) parameter.  If i modify systemd unit to run daemon in 
background, daemon starts:

-ExecStart=/usr/sbin/bird -f -u $BIRD_RUN_USER -g $BIRD_RUN_GROUP $BIRD_ARGS
+ExecStart=/usr/sbin/bird -u $BIRD_RUN_USER -g $BIRD_RUN_GROUP $BIRD_ARGS
+Type=forking

There is something strange between bird and systemd :-) When I start 
bird manually in foreground, everything also works as expected. Below is 
very also minimalist configuration I used for debug the issue.

- Daniel

[1] 
https://gitlab.nic.cz/labs/bird/-/jobs/892286/artifacts/browse/pkg/pkgs/debian-11/bird2_3.0alpha2.1683909033.deb303a4-cznic.1/
[2] 
https://gitlab.nic.cz/labs/bird/-/jobs/883883/artifacts/browse/pkg/pkgs/debian-11/bird2_2.13.1682261375.ca0f239c-cznic.1/

----
log "/var/log/bird/bird.log" all;
debug protocols all;

protocol device {
}

protocol bfd {
}
----


On 5/12/23 18:37, Ondrej Filip wrote:
> Dear BIRD Users,
> we are releasing another alpha version of BIRD 3. We've found some 
> annoying bugs and fixed some usability issues as well as several issues 
> with BIRD crashing. We also added a simple work balancing algorithm 
> between threads. MRT is still switched off, BMP is not merged; they will 
> get into some future alpha version.
> 
> Measured performance in BGP is approx. 6-10x better (with 20 threads) 
> than version 2.13, depending on the actual configuration. Kernel 
> synchronization is slow with a large number of routes; we will look into 
> it soon.
> 
> If you have some time for trying this version out, we would love to hear 
> your feedback.
> 
> I thank my colleagues and namely Maria for this release!
> 
> Cheers
>      Ondrej