old mwan3 (wan 1Gbit/s + 5G WWAN)
new mwan3 (looks like only 1Gbit active)
Looks like something really broken with LB.
Also, not sure is this related:
Summary
[ 556.862521] ucode[23889]: segfault at 10 ip 00007fdc80896095 sp 00007ffd8c3ecdc0 error 4 in rtnl.so[2095,7fdc80896000+7000] likely on CPU 0 (core 0, socket 0)
[ 556.862580] ucode[23890]: segfault at 10 ip 00007f021cba5095 sp 00007ffc25c4a420 error 4
[ 556.868651] Code: 0f 01 00 c3 31 c0 48 85 ff 74 0e 0f b7 07 83 e8 04 48 98 48 39 f0 0f 9d c0 c3 c7 06 02 00 00 00 b8 02 00 00 00 c3 53 48 89 fb <48> 8b 77 10 31 d2 48 8b 3d 0e 10 01 00 ff 15 68 0e 01 00 48 8b 43
[ 556.873617] in rtnl.so[2095,7f021cba5000+7000] likely on CPU 3 (core 3, socket 0)
[ 556.901201] Code: 0f 01 00 c3 31 c0 48 85 ff 74 0e 0f b7 07 83 e8 04 48 98 48 39 f0 0f 9d c0 c3 c7 06 02 00 00 00 b8 02 00 00 00 c3 53 48 89 fb <48> 8b 77 10 31 d2 48 8b 3d 0e 10 01 00 ff 15 68 0e 01 00 48 8b 43