[3.1.1 on EL8] CPU 100% with NetworkManager

[zx at zxinc.org]

Hi there,

When I upgrade bird from 2.16.2 to 3.1.1 today, it became unstable that it often causes CPU usage to 100% for bird,
and later also for NetworkManager, and there are some notable syslogs:

6月 02 16:04:28 zx-router bird[2197971]: I/O loop cycle took 14046.255 ms for 43 events
6月 02 16:04:48 zx-router bird[2197971]: I/O loop cycle took 15307.277 ms for 42 events
6月 02 16:04:57 zx-router bird[2197971]: I/O loop cycle took 8562.921 ms for 43 events
6月 02 16:05:16 zx-router bird[2197971]: I/O loop cycle took 9799.271 ms for 85 events
6月 02 16:05:25 zx-router bird[2197971]: I/O loop cycle took 9330.265 ms for 80 events
6月 02 16:05:30 zx-router bird[2197971]: I/O loop cycle took 5004.867 ms for 44 events
6月 02 16:06:09 zx-router bird[2197971]: I/O loop cycle took 38759.438 ms for 84 events
6月 02 16:06:17 zx-router bird[2197971]: I/O loop cycle took 5465.396 ms for 6 events
6月 02 16:06:23 zx-router bird[2197971]: I/O loop cycle took 5906.858 ms for 44 events
6月 02 16:06:37 zx-router bird[2197971]: I/O loop cycle took 12896.032 ms for 9 events
6月 02 16:06:56 zx-router bird[2197971]: I/O loop cycle took 8217.969 ms for 81 events
6月 02 16:07:08 zx-router bird[2197971]: I/O loop cycle took 9012.775 ms for 25 events
6月 02 16:07:26 zx-router bird[2197971]: I/O loop cycle took 11506.570 ms for 45 events
6月 02 16:07:56 zx-router bird[2197971]: I/O loop cycle took 30014.580 ms for 85 events
6月 02 16:08:05 zx-router bird[2197971]: I/O loop cycle took 6333.289 ms for 6 events
6月 02 16:08:14 zx-router bird[2197971]: I/O loop cycle took 8751.816 ms for 42 events
6月 02 16:08:29 zx-router bird[2197971]: I/O loop cycle took 13017.064 ms for 46 events
6月 02 16:08:51 zx-router bird[2197971]: I/O loop cycle took 13223.357 ms for 80 events
6月 02 16:09:44 zx-router bird[2197971]: I/O loop cycle took 17730.328 ms for 5 events
6月 02 16:10:37 zx-router bird[2197971]: I/O loop cycle took 8061.950 ms for 8 events
6月 02 16:10:46 zx-router bird[2197971]: I/O loop cycle took 9008.065 ms for 65 events
6月 02 16:10:54 zx-router bird[2197971]: I/O loop cycle took 6035.965 ms for 4 events
6月 02 16:11:03 zx-router bird[2197971]: I/O loop cycle took 9959.243 ms for 67 events

I'm exporting full table to kernel with NetworkManager running on RHEL8 related systems (CentOS/Alma/Rocky 8).
There is no problem before upgrading.


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