linux-kernel - Re: [PATCH v2 12/32] mm/vmalloc: vmalloc_to_page() use pte_offset

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Message-ID: <c2358f37-ebaa-44d1-b443-ff91bdedc00b@sirena.org.uk>
Date:   Mon, 10 Jul 2023 18:33:07 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Lorenzo Stoakes <lstoakes@...il.com>
Cc:     Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...nel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Qi Zheng <zhengqi.arch@...edance.com>,
        Yang Shi <shy828301@...il.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Peter Xu <peterx@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>, Yu Zhao <yuzhao@...gle.com>,
        Alistair Popple <apopple@...dia.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Steven Price <steven.price@....com>,
        SeongJae Park <sj@...nel.org>,
        Huang Ying <ying.huang@...el.com>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Zack Rusin <zackr@...are.com>, Jason Gunthorpe <jgg@...pe.ca>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Minchan Kim <minchan@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Song Liu <song@...nel.org>,
        Thomas Hellstrom <thomas.hellstrom@...ux.intel.com>,
        Ryan Roberts <ryan.roberts@....com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        regressions@...mhuis.info, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 12/32] mm/vmalloc: vmalloc_to_page() use
 pte_offset_kernel()

On Mon, Jul 10, 2023 at 06:18:27PM +0100, Lorenzo Stoakes wrote:
> On Mon, Jul 10, 2023 at 03:42:31PM +0100, Mark Brown wrote:

> > We end up seeing NULL or otherwise bad pointer dereferences, the
> > specific error does vary a bit though it mostly appears to be in the
> > pinctrl code.  A bisect (full log below) identified this patch as
> > introducing the failure, nothing is jumping out at me about the patch
> > and it's not affecting everything so I'd not be surprised if it's just
> > unconvering some bug in the platform support but I'm not super familiar
> > with the code.

> Yeah seems likely. Do you have a .config you can share for this board? For
> a 64-bit device you'd expect that this change would probably be a nop.

It's definitely happening with arm64 defconfig, possibly with other
configs but that's the main one.

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