[Bug 216007] XFS hangs in iowait when extracting large number of files

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216007

--- Comment #21 from Peter Pavlisko (bugzkernelorg8392@araxon.sk) ---
(In reply to Mel Gorman from comment #20)
> (In reply to Peter Pavlisko from comment #19)
> > (In reply to Mel Gorman from comment #18)
> > > Created attachment 301044 [details]
> > > Patch to always allocate at least one page
> > > 
> > > Hi Peter,
> > > 
> > > Could you try the attached patch against 5.18 please? I was unable to
> > > reproduce the problem but I think what's happening is that an array for
> > > receiving a bulk allocation is partially populated and the bulk allocator
> > is
> > > returning without allocating at least one page. Allocating even one page
> > > should hit the path where kswapd is woken.
> > 
> > Hi Mel,
> > 
> > I tried this patch and it does indeed work with 5.18.0-rc7. Without the
> > patch it freezes, after I apply the patch the archive extracts flawlessly.
> 
> Thanks Peter, I'll prepare a proper patch and post it today. You won't be
> cc'd as I only have the bugzilla email alias for you but I'll post a
> lore.kernel.org link here.

Thank you very much.

I don't know if this is the proper place to discuss this, but I am curious
about the cause. Was it an issue with the way XFS is calling the allocator in a
for(;;) loop when it does not get the expected result? Or was it an issue with
the allocator itself not working in some obscure edge case? Or was it my
.config, stretching the kernel ability to function in a bad way?

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