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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1rGAi3-004evm-1e; Thu, 21 Dec 2023 04:30:59 +0000 Date: Thu, 21 Dec 2023 04:30:59 +0000 From: Matthew Wilcox To: "Aithal, Srikanth" Cc: kernel test robot , oe-lkp@lists.linux.dev, lkp@intel.com, Linux Memory Management List , Andrew Morton , David Hildenbrand , linux-kernel@vger.kernel.org Subject: Re: [linux-next:master] [mm] bbcbf2a3f0: kernel_BUG_at_mm/memory.c Message-ID: References: <202312192319.fa8f5709-oliver.sang@intel.com> <2b7ae17e-0429-47ab-8101-00486ef9841e@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2b7ae17e-0429-47ab-8101-00486ef9841e@amd.com> X-Rspamd-Queue-Id: A21FE1C0006 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: emjpcbbhw65wz79o1j6rkd55td8tieyn X-HE-Tag: 1703133076-716335 X-HE-Meta: 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 FhoXmoe3 0J5lftalkv6b+tlDIeSoKx7vEQuQSeDKyxGHpqXsccVjv9h0FfyDEDQTGw5qQwFvOGcpOqaGDkuyxHqhQeWvMfP0MwK4GtGCzh/OPeaSUd0BoJSf6RrcqzheCny3r2ErTm8T0jed4p+h4Nn7/WrzGbSL46yg0g8FujZVDKG8NoRLMpxqceeLUqIWVOw== 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, Dec 21, 2023 at 08:26:37AM +0530, Aithal, Srikanth wrote: > Starting from next-20231214 until next-20231220 have noted regression where > kernel hangs randomly while running virtualization tests [multiple > start-shutdown and reboot] against AMD sev guest type, with below call > trace: This is an entirely different problem, already reported and fix sent about 24 hours ago. diff --git a/mm/swap_state.c b/mm/swap_state.c index 793b5b9e4f96..8a3a8f1ab20a 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -894,6 +894,9 @@ struct page *swapin_readahead(swp_entry_t entry, gfp_t gfp_mask, swap_vma_readahead(entry, gfp_mask, mpol, ilx, vmf) : swap_cluster_readahead(entry, gfp_mask, mpol, ilx); mpol_cond_put(mpol); + + if (!folio) + return NULL; return folio_file_page(folio, swp_offset(entry)); }