I performed some reverse commit bisect and thus tested some 4.X kernels.
Here's the result:

1) The bug is present in all 4.4.X kernels until kernel "4.5.7-yakkety"
(build 4.5.7-040507-generic), which's the last one carrying the bad
commit.

Starting on kernel "4.6-rc1" (build 4.6.0-040600rc1-generic), the bug is
gone.

Hence, a "good commit" removed the bad commit on 4.6-rc1.

** Attachment added: "Comparision chart among buggy and non-buggy 4.X kernel 
versions/builds."
   
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-amdgpu/+bug/1608042/+attachment/4714518/+files/COMMITS.pdf

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https://bugs.launchpad.net/bugs/1608042

Title:
  64-bit XUbuntu 16.04 "Xenial" hybrid graphics (Intel + AMD): AMDGPU
  crashes / freezes / hangs entire system

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