@Patrick Salisbury,
As a P.S., If you are able to confirm that Ubuntu 4.10.0-14 is the first
version affected, that would be consistent with a hypothesis that the
patch series associated with: http://bugs.launchpad.net/bugs/1671613 may
be a factor in the regression:
* POWER9: Additional power9 patches (LP: #1671613)
- mm/autonuma: don't use set_pte_at when updating protnone ptes
- mm/autonuma: let architecture override how the write bit should be
stashed in a protnone pte.
- powerpc/mm/autonuma: switch ppc64 to its own implementation of saved write
- mm/gup: check for protnone only if it is a PTE entry
- mm/thp/autonuma: use TNF flag instead of vm fault
- SAUCE: powerpc/mm: handle protnone ptes on fork
- SAUCE: power/mm: update pte_write and pte_wrprotect to handle savedwrite
- mm/ksm: improve deduplication of zero pages with colouring
- mm: introduce page_vma_mapped_walk()
- mm, ksm: convert write_protect_page() to use page_vma_mapped_walk()
- mm/ksm: handle protnone saved writes when making page write protect
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https://bugs.launchpad.net/bugs/1674838
Title:
kernel BUG at /build/linux-
7LGLH_/linux-4.10.0/include/linux/swapops.h:129
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