Re: [PATCH] mm: Fix readahead_page_batch for retry entries

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On Tue, Nov 03, 2020 at 05:10:54PM -0800, Andrew Morton wrote:
> On Tue,  3 Nov 2020 14:28:52 +0000 "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> wrote:
> 
> > Both btrfs and fuse have reported faults caused by seeing a retry
> > entry instead of the page they were looking for.  This was caused
> > by a missing check in the iterator.
> 
> Ambiguous.  What sort of "faults"?  Kernel pagefaults which cause
> oopses?
> 
> It would be helpful to to provide sufficient info so that a reader of
> this changelog can recognize whether this patch might fix some problem
> which is being observed.
> 
> > Reported-by: David Sterba <dsterba@xxxxxxxx>
> > Reported-by: Wonhyuk Yang <vvghjk1234@xxxxxxxxx>
> 
> Perhaps via links to these reports.

Reported by irc/mail, I'll try to dig the stack trace from the logs
again. The crash is hard to hit, there was just one occurence since 5.8
times.



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