Re: [bug, 5.2.16] kswapd/compaction null pointer crash [was Re: xfs_inode not reclaimed/memory leak on 5.2.16]

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* Vlastimil Babka:

> Thanks. Looks like it's indeed here in the page_to_pfn() embedded in the
> clear_pageblock_skip() expansion. We've got a wrong struct page pointer,
> so page_to_section gives us a bogus value, __nr_to_section() a null
> pointer, and __section_mem_map_addr then accesses it.
>
> Hopefully the commit [1] should address the reason why we got a wrong
> page pointer. You could try cherry-picking it to your stable tree, or
> wait until it appears in a (hopefully near) future stable 5.3.y (5.2 is
> EOL, so it won't appear there).

The commit reference appears to be missing. 8->

Due to hardware changes, I've switched back to a distribution kernel
for now, so I won't see the issue in a while even if it is present in
newer kernels, too.  Sorry.




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