[Bug 220057] Kernel regression. Linux VMs crashing (I did not test Windows guest VMs)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220057

--- Comment #44 from Alex Williamson (alex.williamson@redhat.com) ---
Created attachment 308071
  --> https://bugzilla.kernel.org/attachment.cgi?id=308071&action=edit
align faults

Please test this as a potential fix.  It includes the debugging from last time,
so you'll want to unapply that first to get to a clean 6.14.4 base.

The theory here is that we might be getting a VM_FAULT_OOM due to a race rather
than an actual -ENOMEM condition, and while the mm should interpret the failure
differently and handle it, we might avoid the race and use the page table more
efficiently in this scenario if we actively align mappings to create huge pages
rather than deferring non-huge aligned faults to smaller mappings.

Please report results and also attach dmesg with logging for additional
confirmation.  Thanks

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