Re: stable backports for "KVM: x86: Fix shadow paging use-after-free due to unexpected GFN"

[Nathan Gao]

We identified commit a955cad84cda ("KVM: x86/mmu: Retry page fault if root is invalidated by memslot update")
may be the missing piece. After backporting this patch, it's no longer reproducible after 20 consecutive attempts.  

Thanks to Nicolas Saenz Julienne <nsaenz@xxxxxxxxxx> who found this regression initially.

Best,
Nathan