The first bad commit is
8ab3820fd5b2896d66da7bb2a906bc382e63e7bc x86, kaslr: Return location from 
decompress_kernel
which introduces KASLR.

The problem only presents itself when CONFIG_RANDOMIZE_BASE=y.

While this bug has been around in the kernel source for quite a time, it
was dormant, as this option wasn't enabled in some previous Ubuntu
kernel configurations. (This actually caused some headache during the
bisection, as I needed to realize that I have to make sure this option
is always enabled to get proper test results.)

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https://bugs.launchpad.net/bugs/1396889

Title:
  kexec reboot fails

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