On Mon, Dec 09, 2019 at 05:38:01PM -0800, syzbot wrote: > syzbot has bisected this bug to: > > commit bd94c4077a0b2ecc35562c294f80f3659ecd8499 > Author: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> > Date: Wed Oct 28 03:46:05 2015 +0000 > > serial: support 16-bit register interface for console That would be because that is when this function was added to the kernel :) Again, you are asking the kernel to write to a bad place in memory, and then crash when that happens. That sounds like the correct functionality to me... thanks, greg k-h