I was able to reproduce this and agree it's due to the vm_flags check.

I'm pretty sure it should be:
if (!(pfn_valid(pgoff)) && (vma->vm_flags & VM_PFNMAP)) {

The test passes with this change. I will work confirm with the original
patch author and work on a PR to resolve this.

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https://bugs.launchpad.net/bugs/2125434

Title:
  NVIDIA 6.14 kernel SAUCE patch causes LTP madvise07 test case to fail
  with "Child killed by SIGKILL"

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