How to report kernel panic in 4.4.x

[Matthias B.]

Hallo,

4.4.147 is the last kernel of the 4.4.x series that boots for me. All
subsequent versions panic on boot. How do I report this bug? 
If I'm supposed to use https://bugzilla.kernel.org/ I don't know what
to fill into the fields. I don't even know if the longterm kernel falls
under "Mainline" or some other tree.

MSB

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