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Wong" To: Matthew Wilcox Cc: Luis Chamberlain , David Bueso , Jan Kara , Kefeng Wang , Tso Ted , Ritesh Harjani , Johannes Weiner , Oliver Sang , David Hildenbrand , Alistair Popple , linux-mm@kvack.org, Christian Brauner , Hannes Reinecke , oe-lkp@lists.linux.dev, lkp@intel.com, John Garry , linux-block@vger.kernel.org, ltp@lists.linux.it, Pankaj Raghav , Daniel Gomez , Dave Chinner , gost.dev@samsung.com, linux-fsdevel Subject: Re: [linux-next:master] [block/bdev] 3c20917120: BUG:sleeping_function_called_from_invalid_context_at_mm/util.c Message-ID: <20250408180240.GM6266@frogsfrogsfrogs> References: <20250331074541.gK4N_A2Q@linutronix.de> <20250408164307.GK6266@frogsfrogsfrogs> <20250408174855.GI6307@frogsfrogsfrogs> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspamd-Queue-Id: 8E0B24000E X-Stat-Signature: insng8d9g369rsigum3cggjtwiayu9ki X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1744135362-570856 X-HE-Meta: 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 T+5JjC01 pys5uYfWSjwK1AdriAjT05y1aLs/RvnSkPIt+zVZygUulW+CM3LvQqRIsOv7DfalElLrJ6+ZvCxFlECx75AnvCPi6BteR1Kb+mWn4VPIl9Ael9YL75BHECxYCfNgTXRWUu+iMtEj0HXSEOc+AY7Pipho4B3p8TK4pInUuKPwHdSTLXYn9zQE11dluShmfwnhBE41TcuPlksBHnnks9b07T4KEkCRo1mR1NLhx2FmmNPccVvOq+NUL513Y7yVtYUGjzXQVT0BgZ10KzJ+gy1NCsdMuk9fib7FadmwCzk8y0+b+KmgpwjgaNQU0jScxyRqd0uW0IUr+77lqK6prqATVC1H6/1S4WeMS97D0zdz5dmT5k02Qmbx2jMmXAK4AEft20omccR/n7150KzH3iVYNFJt7V1FSjbu+5RBF 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 Tue, Apr 08, 2025 at 06:51:14PM +0100, Matthew Wilcox wrote: > On Tue, Apr 08, 2025 at 10:48:55AM -0700, Darrick J. Wong wrote: > > On Tue, Apr 08, 2025 at 10:24:40AM -0700, Luis Chamberlain wrote: > > > On Tue, Apr 8, 2025 at 10:06 AM Luis Chamberlain wrote: > > > > Fun > > > > puzzle for the community is figuring out *why* oh why did a large folio > > > > end up being used on buffer-heads for your use case *without* an LBS > > > > device (logical block size) being present, as I assume you didn't have > > > > one, ie say a nvme or virtio block device with logical block size > > > > > PAGE_SIZE. The area in question would trigger on folio migration *only* > > > > if you are migrating large buffer-head folios. We only create those > > > > > > To be clear, large folios for buffer-heads. > > > > if > > > > you have an LBS device and are leveraging the block device cache or a > > > > filesystem with buffer-heads with LBS (they don't exist yet other than > > > > the block device cache). > > > > My guess is that udev or something tries to read the disk label in > > response to some uevent (mkfs, mount, unmount, etc), which creates a > > large folio because min_order > 0, and attaches a buffer head. There's > > a separate crash report that I'll cc you on. > > But you said: > > > the machine is arm64 with 64k basepages and 4k fsblock size: > > so that shouldn't be using large folios because you should have set the > order to 0. Right? Or did you mis-speak and use a 4K PAGE_SIZE kernel > with a 64k fsblocksize? This particular kernel warning is arm64 with 64k base pages and a 4k fsblock size, and my suspicion is that udev/libblkid are creating the buffer heads or something weird like that. On x64 with 4k base pages, xfs/032 creates a filesystem with 64k sector size and there's an actual kernel crash resulting from a udev worker: https://lore.kernel.org/linux-fsdevel/20250408175125.GL6266@frogsfrogsfrogs/T/#u So I didn't misspeak, I just have two problems. I actually have four problems, but the others are loop device behavior changes. --D