From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B6D141A8407; Tue, 8 Apr 2025 17:48:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744134535; cv=none; b=BTNBpjPgLJYjNDtsnVUOnKRyDYoJA56y18i3K8HoZuB0fng6KtOOjxGK8T0DYSUrUkYNlpoERbHuJN8O0hz7Mbcr4Ls4JlTddcjPHSd0meUMd+JKvy/t8VsLkljHIv5proVmAYKF4kX96Q3rZJp2hCAR1x0tZUqBLgbfwV3kUFk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744134535; c=relaxed/simple; bh=TdcykO/mghNf7CApPAPiGbc4Ap+76aFjaQ1G0ZF/1Fw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=qAw8hynYVbvTZXKV9PJ5wuU2hzVTIHxiZMwBCJw/4MLPL8VL9I7+WLzUw6d49Vnkj7169IKJVI6B+mcaHdiWTzen2UO6iwmwMK6eHTqhqQ4hxqrFugRgHTCwtvGFau6diyEKc4GnJ6MEDS/ug1dtLJo4vD4MWpSPsyBmOFB3phM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=r011JZJ1; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="r011JZJ1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 90F30C4CEE5; Tue, 8 Apr 2025 17:48:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1744134535; bh=TdcykO/mghNf7CApPAPiGbc4Ap+76aFjaQ1G0ZF/1Fw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=r011JZJ1Bwu5Q3CTglhODEsz9xvCkNNFznG4hJq0zj2FGM9UvvS6i18OLvLwe9EIW wbciFnly4IhqfzgqcxVGhGbTXEPXWtX2tSZsbyJQCDrZj0lsAvc1ctVYf4zeFktpIZ 3vZm/cpmUHcjicVH0gPjtT+TAKnAPx/IS2GpFhx4eiyBRRwaYtosGcFp+8vzy3Bw+N XTN8eS0glsG4Jmqi5/T5CorQajBJXZ0O9B3f/BZ4GGrHHd3u+4exvp31qgZ7FBuoU8 kzzNFYOm4wswHtUy1uL8Clg7ln3OgJeic63egQay8Be9BmABHamxhE98z7PlVQxf2P JtSj3XxUtX+og== Date: Tue, 8 Apr 2025 10:48:55 -0700 From: "Darrick J. Wong" To: Luis Chamberlain Cc: David Bueso , Jan Kara , Kefeng Wang , Tso Ted , Ritesh Harjani , Johannes Weiner , Oliver Sang , Matthew Wilcox , 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: <20250408174855.GI6307@frogsfrogsfrogs> References: <20250331074541.gK4N_A2Q@linutronix.de> <20250408164307.GK6266@frogsfrogsfrogs> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: 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. --D