From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9F1FFD35178 for ; Wed, 1 Apr 2026 11:41:23 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E163A6B0088; Wed, 1 Apr 2026 07:41:22 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id DEE7A6B0089; Wed, 1 Apr 2026 07:41:22 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D2BCA6B008A; Wed, 1 Apr 2026 07:41:22 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id C0CD96B0088 for ; Wed, 1 Apr 2026 07:41:22 -0400 (EDT) Received: from smtpin17.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 6F04D8C39D for ; Wed, 1 Apr 2026 11:41:22 +0000 (UTC) X-FDA: 84609796404.17.A751561 Received: from out-170.mta1.migadu.com (out-170.mta1.migadu.com [95.215.58.170]) by imf15.hostedemail.com (Postfix) with ESMTP id 9C8CDA0011 for ; Wed, 1 Apr 2026 11:41:20 +0000 (UTC) Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=Z5igplaL; spf=pass (imf15.hostedemail.com: domain of lance.yang@linux.dev designates 95.215.58.170 as permitted sender) smtp.mailfrom=lance.yang@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1775043680; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=b13KGvyLogtVdL0iQImh9QPPdc4i4Vx371Gruxsxw98=; b=L5YzNwgSy+QgG3A6i1Nd23Kl1YBhymkgw5zktOY67D4Rx9vrJmlOuBUc+vO++09Dg/3KuX e6JbUOjOoBsmhgRI5q35SuPs4rq13I1h+9UQIKyBr6xc32SND++DbAw6Ao30QMMF4I2y/6 AGtBZ9Mxg6u/vrrI79YBPlFuZOZ1Obk= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1775043680; a=rsa-sha256; cv=none; b=Jn2xird5ek/Ed846T65FKdcq0elhIVxX2c52bVaDIIDdWN1lKjfxmgVYCnHgvIHkiSxU+o AAvYZbFCG9ZY4iRa7qYLBoaiM90gncd1u8K7cJlUHW21WLIjsx67uOOdogYbzYQKi6nNDl BZ2LwCpKvoXtIMPCosIRVFMGPoOVGxY= ARC-Authentication-Results: i=1; imf15.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=Z5igplaL; spf=pass (imf15.hostedemail.com: domain of lance.yang@linux.dev designates 95.215.58.170 as permitted sender) smtp.mailfrom=lance.yang@linux.dev; dmarc=pass (policy=none) header.from=linux.dev Message-ID: <7176f8a2-8830-4fe9-b00e-fae67e2ac81d@linux.dev> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1775043678; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=b13KGvyLogtVdL0iQImh9QPPdc4i4Vx371Gruxsxw98=; b=Z5igplaLxy29+thTrFyJCAfRPzl/HshpDrD3dnFTkZn6ogDxQZJiNOfhfblTCiY3+NctKA QE3k2hPAWTAjw6fzQcLS3PYLC2TLC0y8Xut0V0MixZIRyTgUus6yyUnSvKogvtYveleKNp YoI5uDwS+YFCHEG2lTtSzkWl6NnW1r4= Date: Wed, 1 Apr 2026 19:41:04 +0800 MIME-Version: 1.0 Subject: Re: [syzbot] [mm?] WARNING in deferred_split_folio Content-Language: en-US To: "David Hildenbrand (Arm)" Cc: kartikey406@gmail.com, usama.arif@linux.dev, Liam.Howlett@oracle.com, ziy@nvidia.com, syzbot+a7067a757858ac8eb085@syzkaller.appspotmail.com, akpm@linux-foundation.org, baohua@kernel.org, baolin.wang@linux.alibaba.com, dev.jain@arm.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, npache@redhat.com, ryan.roberts@arm.com, syzkaller-bugs@googlegroups.com References: <38a347dc-8a1c-4d04-926d-7a6318e93ca2@kernel.org> <20260401113434.29369-1-lance.yang@linux.dev> X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Lance Yang In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam12 X-Stat-Signature: dmoxwsg1ski5kepstn3cze77qjt717d1 X-Rspamd-Queue-Id: 9C8CDA0011 X-Rspam-User: X-HE-Tag: 1775043680-105441 X-HE-Meta: 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 IoGsWaOo OuzzucZOvNLwo6g+tvAjvxNDpQpBb1xPt9Yuls9/FHZJFT1jfKhFlkpeAipTzgLT7A4AUBc2Qj1hYeP3UZDRAcU0Y6haDfICHtJyLeGnyz8rdPP5nwEkFKELU75IpMyY2cI2WhTqzB/fhImWWk1uLxoRWcBRIPlV2mu7A79gGzsK/xuo/6+FEnjv6Hfmk09QfyUpN7fPhswOj5E62ueiVLN0bEd8yZ9UazUtCqwZrJspMOy+NpXyWNyD8C3RUBIY5ZP6WlZecscNylucPxk/ZUQu9ffsyXNsW/B5k4uUxXhcaZGNOIXD/4tpwk1l6640MHq8pmg4VwKpNsgQntjqkq5FFrRD16nfFCOREjL/B72KU+XYzh3ZWwNjuxh0TnF2yA6QR8SE6vLM+IddplHbh8ocSsA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2026/4/1 19:38, David Hildenbrand (Arm) wrote: > On 4/1/26 13:34, Lance Yang wrote: >> >> On Wed, Apr 01, 2026 at 01:22:58PM +0200, David Hildenbrand (Arm) wrote: >>> On 4/1/26 13:20, Lance Yang wrote: >>>> >>>> >>>> Ouch, you're right, I was wrong - the trylock drop is a pre-existing >>>> issue, not caused by the reorder ;) >>>> >>>> >>>> Nice, LGTM! >>>> >>>> Given that the "trylock -> drop" behavior seems to exist already today, >>>> do you think it's worth fixing that together with the reorder? >>> >>> I'd do it in a single shot if possible. >> >> ACK. >> >>> Can you craft something? (cc stable etc) >> >> certainly, will do! But commit[1] ("mm: migrate: requeue destination >> folio on deferred split queue") is only in mm-stable now, not yet >> upstream/stable ... > > It's tricky. The original commit will be backported to stable kernels, > so we want also the fix to be backported to the same stable kernels. > > The commit id in mm-stable is "stable" now. Emm... Not a big deal, I guess. We can always submit a stable backport once that fix gets merged into stable :D