I've taken a look at the dmesg(8) at pastebin. You appear to have been using a custom kernel, since the kernel is not GENERIC or GENERIC.MP. Custom kernels are not supported; your customization could have been the cause of your boot loop.
Per the FAQ, any problems occurring with a custom kernel must be repeatable with a GENERIC kernel to obtain support.
(There are sometimes valid reasons for custom kernels. One example: to respond to a call for testing of a newly developed kernel feature from a developer, before it is committed to -current. )
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