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h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=xNEDNhz5QlzjnZRZ2nhBDfI7zoTlNezwdFp8dZqLiICEvy7+vFd1kD6XRoQl7MuF1 KmXh1xrzzp6i3wZqWF6wfAnWe6MmxscaVpkqCHEV14iU4XbXXSXUr7watwCyFxq7AZ aTxGfkZwPa+2sbtytnrbxkQTG9uQLytZxlOrHG2I= Date: Thu, 21 Dec 2023 13:58:33 -0800 From: Andrew Morton To: David Hildenbrand Cc: Oliver Sang , Matthew Wilcox , oe-lkp@lists.linux.dev, lkp@intel.com, Linux Memory Management List , linux-kernel@vger.kernel.org Subject: Re: [linux-next:master] [mm] bbcbf2a3f0: kernel_BUG_at_mm/memory.c Message-Id: <20231221135833.92b8b2a97b28ad0545977f6c@linux-foundation.org> In-Reply-To: References: <202312192319.fa8f5709-oliver.sang@intel.com> <20231220141135.cb4241442b657104f0aeae34@linux-foundation.org> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 7C6DFC001A X-Stat-Signature: qot4sc3auxe7o5w58qatq5e7tfbpi91i X-Rspam-User: X-HE-Tag: 1703195919-254931 X-HE-Meta: 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 Lg86TSZX VmiveqZCTwiaoKfksJ2OYbaaXXlavd/3DGpRqk7t9NTh8OfvGFbllJVV0MxXZIJq0NKlIH7bhwXzB4I9wsKdxFD21OYFBFNnfSIDnCEbVBWVZAwpNPOSmEvXJ1dJHsGKIERW+ed+uGawIlBhOuKsPX2pDsSo2dtlbIh9bcntN5nDbW/JjkU6Yd30F1RLcF0fxBm62BpsIcILVDm4+AIKXiSafNZQzKuHipAeArgfzmnRq3FSTOVi4ULiBwxPpgsZXuLFhFQtVBOm0fbM1ntW6yEOFGilxOTx0/edutVduG6W1X5MA13XHXDW0nEi7RSTIF2LK 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: 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.