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Date:   Mon, 10 Jul 2023 18:33:07 +0100
From:   Mark Brown <broonie@kernel.org>
To:     Lorenzo Stoakes <lstoakes@gmail.com>
Cc:     Hugh Dickins <hughd@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Mike Rapoport <rppt@kernel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Matthew Wilcox <willy@infradead.org>,
        David Hildenbrand <david@redhat.com>,
        Suren Baghdasaryan <surenb@google.com>,
        Qi Zheng <zhengqi.arch@bytedance.com>,
        Yang Shi <shy828301@gmail.com>,
        Mel Gorman <mgorman@techsingularity.net>,
        Peter Xu <peterx@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Will Deacon <will@kernel.org>, Yu Zhao <yuzhao@google.com>,
        Alistair Popple <apopple@nvidia.com>,
        Ralph Campbell <rcampbell@nvidia.com>,
        Ira Weiny <ira.weiny@intel.com>,
        Steven Price <steven.price@arm.com>,
        SeongJae Park <sj@kernel.org>,
        Huang Ying <ying.huang@intel.com>,
        Naoya Horiguchi <naoya.horiguchi@nec.com>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        Zack Rusin <zackr@vmware.com>, Jason Gunthorpe <jgg@ziepe.ca>,
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        Anshuman Khandual <anshuman.khandual@arm.com>,
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        Christoph Hellwig <hch@infradead.org>,
        Song Liu <song@kernel.org>,
        Thomas Hellstrom <thomas.hellstrom@linux.intel.com>,
        Ryan Roberts <ryan.roberts@arm.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        regressions@leemhuis.info, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 12/32] mm/vmalloc: vmalloc_to_page() use
 pte_offset_kernel()
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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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