linux-kernel - Re: [Update] Regression in 4.18 - 32-bit PowerPC crashes on boot

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Date:   Fri, 29 Jun 2018 19:22:01 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     aneesh.kumar@...ux.ibm.com,
        Larry Finger <Larry.Finger@...inger.net>,
        Matthew Wilcox <willy@...radead.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Christoph Lameter <cl@...ux.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Pekka Enberg <penberg@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Update] Regression in 4.18 - 32-bit PowerPC crashes on boot -
 bisected to commit 1d40a5ea01d5

On Fri, Jun 29, 2018 at 2:46 PM Kirill A. Shutemov <kirill@...temov.name> wrote:
>
> Looks like pgtable_page_dtor() gets called in __pte_free_tlb() path twice.
> Once in __pte_free_tlb() itself and the second time in pgtable_free().

Ahh, that would certainly do it,. and explains why this hits ppc32 but
not x86, for example.

                Linus