This may only apply to a small subset of people here but if anyone uses Alpine on bare metal and upgrades the kernel to 5.15.76, it may hang at 18 to 24%. If it does, just control-c and remove the /boot/.apk* files and undo any custom hardening that disables unused kernel modules. This specific kernel is attempting to talk to a module, I suspect related to the backlight quirks [1] being added not related to 6.1. I have not dug deep enough into this to know the exact communication that is timing out and honestly I am too lazy to do that.Just move your scripts and/or modprobe.d custom blacklist files out of the way, reboot, then upgrade the kernel, then move your hardening back in place and reboot again.
Again, this only applies to people that disable unused modules and only on bare metal. I do this on my router/firewall to keep the memory footprint smaller and attack surface smaller. I'm odd like that.
I have not run into this on any of my VM's and only on 2 bare metal machines.
[1] - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.76