If this bug is happening with 4.13.0-21, it's probably not PTI related.
I'll build a test kernel with the commit you posted in the description
and post it shortly.
** Tags removed: pti
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** Changed in: linux
Status: Unknown => Fix Released
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https://bugs.launchpad.net/bugs/1742630
Title:
PTI Kernels: Booting from 4.13 leads to Oops: NULL pointer dereference
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** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
** Also affects: linux (Ubuntu Artful)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Artful)
Status: New => Triaged
** Changed in: linux (Ubuntu Artful)
Importance: Undecided => High
** Bug
** Tags added: artful kernel-da-key
** Changed in: linux (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1742630
Title:
PTI Kernels: Booting from 4.13 leads