[Bug 213069] kernel BUG at arch/powerpc/include/asm/book3s/64/hash-4k.h:147! Oops: Exception in kernel mode, sig: 5 [#1]

https://bugzilla.kernel.org/show_bug.cgi?id=213069

Christophe Leroy (christophe.leroy@csgroup.eu) changed:

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                 CC|                            |christophe.leroy@csgroup.eu

--- Comment #2 from Christophe Leroy (christophe.leroy@csgroup.eu) ---

The bug is not in powerpc but in function pmd_basic_tests() in
mm/debug_vm_pgtable.c
(https://elixir.bootlin.com/linux/v5.13-rc1/source/mm/debug_vm_pgtable.c#L146)

pfn_pmd() should not be called before the has_transparent_hugepage()
verification.

Same problem in pmd_advanced_tests()

And there is the exact same issue with PUD tests with pfn_pud() function.

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