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Sat, 12 Apr 2025 06:40:43 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: Teb9e062682a72887 Date: Sat, 12 Apr 2025 12:40:13 +0200 From: "Arnd Bergmann" To: "Dave Hansen" , "Arnd Bergmann" , linux-kernel@vger.kernel.org, x86@kernel.org Cc: "Thomas Gleixner" , "Ingo Molnar" , "Borislav Petkov" , "Dave Hansen" , "H. Peter Anvin" , "Linus Torvalds" , "Andy Shevchenko" , "Matthew Wilcox" , "Sean Christopherson" , "Davide Ciminaghi" , "Paolo Bonzini" , kvm@vger.kernel.org, "Mike Rapoport" , "Mike Rapoport" Message-Id: <2615bf9e-61a4-488e-8842-3230de4f5033@app.fastmail.com> In-Reply-To: <08b63835-121d-4adc-8f03-e68f0b0cabdf@intel.com> References: <20241204103042.1904639-1-arnd@kernel.org> <20241204103042.1904639-6-arnd@kernel.org> <08b63835-121d-4adc-8f03-e68f0b0cabdf@intel.com> Subject: Re: [PATCH 05/11] x86: remove HIGHMEM64G support Content-Type: text/plain Content-Transfer-Encoding: 7bit On Sat, Apr 12, 2025, at 01:44, Dave Hansen wrote: > Has anyone run into any problems on 6.15-rc1 with this stuff? > > 0xf75fe000 is the mem_map[] entry for the first page >4GB. It obviously > wasn't allocated, thus the oops. Looks like the memblock for the >4GB > memory didn't get removed although the pgdats seem correct. > > I'll dig into it some more. Just wanted to make sure there wasn't a fix > out there already. > > The way I'm triggering this is booting qemu with a 32-bit PAE kernel, > and "-m 4096" (or more). I have reproduced the bug now and found that it did not happen in my series. Bisection points to Mike Rapoport's highmem series, specifically 6faea3422e3b ("arch, mm: streamline HIGHMEM freeing") There was a related bug that was caused by an earlier version of my series when I also removed CONFIG_PHYS_ADDR_T_64BIT https://lore.kernel.org/all/202412201005.77fb063-lkp@intel.com/ Arnd