CURRENT: can not add device to bridge: ifconfig: BRDGADD igb0: Invalid argument

Hello,

running recent CURRENT (FreeBSD 15.0-CURRENT #68 main-n277334-d9900b9ea2b2: Sun May 18
16:51:02 CEST 2025), I ran into the following problem: 
Can not add interfaces anymore to a bridge device. 
Neither existing physical devices, nor epair devices created during setup of jails - with the
result of no jails availabel and/or no bridge working.

A more amusing part of this story is: I ran almost two identical boxes, based upon elderly
IvyBridge CPUs, both on outdated ASrock Z77 Pro mainboards. One machine, the
now-failing-one, has moved to AMD Ryzen 9700X based box based on ASrock B850 mainboard - just
for the record, if this is of importance or interest.

On both systems I use custom kernels, mostly disabling unused devices. Having an ABI issue in
mind, I recompiled the whole world/kernel on the system with AMD CPU, but the issue is the
still persistent.

A real hardware problem or just a coincidence with faulty code?

Thanks for helping,

O. Hartmann


-- 

A FreeBSD user