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Dec 2023 08:13:50 +0000 Date: Fri, 22 Dec 2023 16:13:42 +0800 From: Oliver Sang To: David Hildenbrand CC: Andrew Morton , Matthew Wilcox , , , "Linux Memory Management List" , , Subject: Re: [linux-next:master] [mm] bbcbf2a3f0: kernel_BUG_at_mm/memory.c Message-ID: References: <202312192319.fa8f5709-oliver.sang@intel.com> <20231220141135.cb4241442b657104f0aeae34@linux-foundation.org> <20231221135833.92b8b2a97b28ad0545977f6c@linux-foundation.org> <6a8f2110-fa91-4c10-9eae-88315309a6e3@redhat.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <6a8f2110-fa91-4c10-9eae-88315309a6e3@redhat.com> X-ClientProxiedBy: SI1PR02CA0048.apcprd02.prod.outlook.com (2603:1096:4:1f5::11) To LV3PR11MB8603.namprd11.prod.outlook.com (2603:10b6:408:1b6::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV3PR11MB8603:EE_|SN7PR11MB6703:EE_ X-MS-Office365-Filtering-Correlation-Id: 945b15b6-0283-46db-16d3-08dc02c5ee07 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Xui8lYf6C1y6LauDQI/CVBRRPknRVTB4UT2Is8APim/04I7ejRNAQzwu6KH7EkUK86gE3S5gTW6RtO0SbvAlCnunCRGv6TWV7RfTR8J+QcH27dsRtS2u1WJoVmoQswK6X71lNjSzolNUiCHqQrWfMzt0zlfuUCElsI9YkTwivuKP0E3AlW1pN657HW46VKMCV6qRpFxaBtjjd4YYOt/Jc0YD1YnzY6p5QCvRxC4hwcVxaUxUU6zbCr5SlFyoMOPWVgPFnpSFkDbK4mk9gZFGt9FgtzpWHL4AZXqKVmLNF1RmocfWUEGgi0GlXD0nJv7uDSTNsEBZMFixXoFMR/9TrlLKN9qC24K/aOfz7YgdciatrkH3dQQCHSSMVceRXKSoYVypjLjzF3sWP8/KII6aoDB6Au8sdmjKJmbA7TWVz3293tXY2z+Q/kQ0gR537jZOZy1VNAm7qD6t6NkrMzysgx9fi9A== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: hi, David, On Thu, Dec 21, 2023 at 11:07:21PM +0100, David Hildenbrand wrote: > On 21.12.23 22:58, Andrew Morton wrote: > > On Thu, 21 Dec 2023 12:32:04 +0100 David Hildenbrand wrote: > > > > > On 21.12.23 12:23, Oliver Sang wrote: > > > > hi, Andrew Morton, > > > > > > > > On Wed, Dec 20, 2023 at 02:11:35PM -0800, Andrew Morton wrote: > > > > > On Tue, 19 Dec 2023 23:46:50 +0800 kernel test robot wrote: > > > > > > > > > > > > > > > > > > > > > > > Hello, > > > > > > > > > > > > kernel test robot noticed "kernel_BUG_at_mm/memory.c" on: > > > > > > > > > > > > commit: bbcbf2a3f05f74f9d268eab57abbdce6a65a94ad ("mm: convert ksm_might_need_to_copy() to work on folios") > > > > > > > > > > I assume this is a bisection result, so it's quite repeatable? > > > > > > > > yes, we bisect to this commit, it's quite repeatable: > > > > > > > > ddd06bb63d9793ce bbcbf2a3f05f74f9d268eab57ab > > > > ---------------- --------------------------- > > > > fail:runs %reproduction fail:runs > > > > | | | > > > > :6 100% 6:6 dmesg.Kernel_panic-not_syncing:Fatal_exception > > > > :6 100% 6:6 dmesg.RIP:do_swap_page > > > > :6 100% 6:6 dmesg.invalid_opcode:#[##] > > > > :6 100% 6:6 dmesg.kernel_BUG_at_mm/memory.c > > > > > > > > > > > > > > Can you try with the snipped I sent? Please let me know if you need a > > > full patch for testing purposes. > > > > I think a full patch would be better, please. > > we cannot reproduce the issue reported previously after applying below patch. Thanks > > From b82e309096abde6c0f24bba50a281e8d3855c132 Mon Sep 17 00:00:00 2001 > From: David Hildenbrand > Date: Thu, 21 Dec 2023 23:04:30 +0100 > Subject: [PATCH] Fixup: mm: convert ksm_might_need_to_copy() to work on folios > > We must only adjust the page if the folio changed. Otherwise, if we > had a large folio in the swapcache and the folio didn't change, we'd > suddenly change the page to-be-mapped. > > Reported-by: kernel test robot > Closes: https://lore.kernel.org/oe-lkp/202312192319.fa8f5709-oliver.sang@intel.com > Signed-off-by: David Hildenbrand > --- > mm/memory.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/mm/memory.c b/mm/memory.c > index 149f779910fd5..2f9668d357f5c 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -3952,7 +3952,8 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) > folio = swapcache; > goto out_page; > } > - page = folio_page(folio, 0); > + if (folio != swapcache) > + page = folio_page(folio, 0); > /* > * If we want to map a page that's in the swapcache writable, we > -- > 2.43.0 > > > -- > Cheers, > > David / dhildenb >