Recently I installed the 22.03.0-rc4 version firmware on my router, with some add-on packages. Everything runs fine at the beginning.
But one day later, when I tried to reboot my router, it fell into an infinite reboot loop. It just repeatedly reboots before the network interfaces become available.
Luckily I can reinstall the firmware via u-boot so I didn't brick my router. But after the reinstallation all logs are gone so I can't find out what caused the issue. After the reinstallation, everything works fine again, and I can also normally reboot my router. But several hours later, when I try to reboot it, the issue comes back.
I opened the case of my router and luckily I didn't break the plastic case.
I have collected the boot log from the serial console. Since in this post I just asked "how to find what is the problem" (and the solution is to use the serial console ), I created another post with the boot log attached.