Re: unhandlable pages

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On Mon, Mar 21, 2022 at 05:21:05PM +0000, Matthew Wilcox wrote:
> On Mon, Mar 21, 2022 at 10:17:29AM -0700, Luck, Tony wrote:
> > Validation folks are seeing this on a v5.16 kernel. I don't
> > see any changes in v5.17 that look like they address it.
> > 
> > Mar 04 14:05:05 JF5300-07B181T kernel: page:00000000696b0b6a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x195cda44
> > Mar 04 14:05:05 JF5300-07B181T kernel: flags: 0x57ffffc0801000(reserved|hwpoison|node=1|zone=2|lastcpupid=0x1fffff)
> > Mar 04 14:05:05 JF5300-07B181T kernel: raw: 0057ffffc0801000 ffff6ea817369108 ffff6ea817369108 0000000000000000
> > Mar 04 14:05:05 JF5300-07B181T kernel: raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
> > Mar 04 14:05:05 JF5300-07B181T kernel: page dumped because: hwpoison: unhandlable page
> > Mar 04 14:05:05 JF5300-07B181T kernel: Memory failure: 0x195cda44: recovery action for unknown page: Ignored
> > 
> > Som debugging shows this is an anon page (expected ... that's the
> > type of page where the error was injected. They see shake_page()
> > called three times, but it doesn't change anything, so the page
> > is reported as unhandlable.
> 
> Uhm, that's not PageAnon.  page->mapping is NULL, and anon pages have
> the bottom bit set with the rest of the page->mapping pointing to its
> anon_vma.  Why do you think it's an anon page?

Sorry. I didn't do that decode ... just copied what was in the internal
report.  If it isn't anon, then does that page dump give info on what
type the page is?

-Tony




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