Did this issue start happening after an update/upgrade?  Was there a
prior kernel version where you were not having this particular problem?

If it is a regression, we can perform a kernel bisect to narrow down
which commit introduced it.

Also, it might be good to test the latest mainline kernel to see if this
bug was already fixed upstream.  If it was, can investigate to find the
commit that fixes the bug.

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: pmdk (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: Ubuntu Bionic
   Importance: Undecided
       Status: New

** No longer affects: pmdk (Ubuntu Bionic)

** No longer affects: Ubuntu Bionic

** Changed in: linux (Ubuntu Bionic)
       Status: New => Confirmed

** Changed in: linux (Ubuntu Bionic)
   Importance: Undecided => High

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Bionic)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

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https://bugs.launchpad.net/bugs/1799237

Title:
  mprotect fails on ext4 with dax

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