From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f175.google.com (mail-pl1-f175.google.com [209.85.214.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A3A7C52F78; Wed, 20 Mar 2024 18:42:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.175 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710960154; cv=none; b=K3sRIjGrU8XhSj91Ayt7S/Z0OP+1Z6WAiD7tblMSc93Up7S+VCvgVGP9VLosF3pVpo6jFtzJVuS3nLrAbsbhZrkSYJMT8RQQ4LD/qbw2bo3B3aii5JzLML1tuHhNRhdJ1sgkz28JB4fJY74uRWhGAX8w39DvRoLzwtcDqggbeyo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710960154; c=relaxed/simple; bh=OvDWzf5QI11nP6xn7V6BvV75EVnGelLYBI+80MwL2kM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=M1CN5GShQH3ale5KdlOxbaJqp3YAjVGX1IjXpeSnJyPtdC15oI2MJZXObxVzCcKwj+PR3Pe8LGMpG8eXLPgYfcUbpj3SZYTZykL/8xTssadX7LzhKXkdR6JdPuZk5MrLpgprRZXd7YoIyxCVl1zlWQ2pVQNrA6imeqPKYx1fMTQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=roeck-us.net; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=V0PNjJQj; arc=none smtp.client-ip=209.85.214.175 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=roeck-us.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="V0PNjJQj" Received: by mail-pl1-f175.google.com with SMTP id d9443c01a7336-1dddbeac9f9so583035ad.3; Wed, 20 Mar 2024 11:42:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1710960152; x=1711564952; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:from:to:cc:subject:date:message-id :reply-to; bh=LpVGt7eapRMQ5PJBsTrUq3TIxfCzxXLVn/uEUHsdaK4=; b=V0PNjJQje1r4M2vkmihN3QsStJdDHpCsl9giaaDhMSHt43SaEOHyZna+HNFHPSjnsn jUw4yESxHcsf5y7mWHiNS7l6d8s1HxraF2exj9DkQtyN+uMqKRH6LS8AjfVqydt0m5MU Sp8DTGHZZ61q66HJTTkUutHROEE6DJJLPe28zAUw8yIZ0NrLKTG5JPGVTEjFJhKJktza /6sxLooKivKyjrKs87wo/JC5UP8OvX+NI9pshl9zoF4e9FkMCeFufEAF1A8jtPI+Td2t J5Hamf2oJvNmaZuiiIIy1Ix65MsiKgZUz+D0hBDQXSy+lMhCecLwrqpNhT4J+v0+oPD8 g2tA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1710960152; x=1711564952; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=LpVGt7eapRMQ5PJBsTrUq3TIxfCzxXLVn/uEUHsdaK4=; b=GSoD5GrM2SuBA76SsxVxBAS+/AEO9G18CaqqD7dDjhKVWZAjWFzpovyoJNM58EQ94e 3lLJdwgW0Hx1ookWPBz0xZraP5weJQKS80uIsZGW6jQSc3NQVjIMgeEpDeZ8n3+bdCme leT+zrS57r7MS5lnlOebA4F4ckFPXFbh3QAsQmP57slsyr3ZxIQ5c+WRskjhhLW+IvSk sch1lubcVvaSLbjOlNtCmN1oDDM1BmljOFkpbgmfcf1qtan8urHnDeLvGcBohknVg3pm uph/DZxls/7m+iKJxmq/DhBtZsmcsUAp2vShhUs6nwAGlGny4dPd9unHNADMfEWVg1BZ 8LYg== X-Forwarded-Encrypted: i=1; AJvYcCXFjlhD8cc/pvJKEKeZVH/s9SH08ADP/oR/JEQXosnNkRbXGRgihm8po5ugBq/4VIxItkvdGsF2ADrksPva8CPeefPbLNP+gwgEkY2VmEduNQIfjsxbswGuSpArZRsDHIogZvBGvUqFEQ== X-Gm-Message-State: AOJu0YxKxaUPCey1EI2xPogMbqomsB9OavGj/emTZ5feFFa7xxOPVGdJ Vn8dvz2jmGWlSmk5YxDpE+IYuux4jLE4vom8oPGR5w3TuTAxkBMDuNfrGTcU X-Google-Smtp-Source: AGHT+IGAV8kfrE1TushQq2bRjeOsJwkTc6VrsiuidrOOybNSfh6ZRjlKJ0xGxxnuN3ztg9H4PEqcSA== X-Received: by 2002:a17:903:11c3:b0:1dd:7d6a:d6c8 with SMTP id q3-20020a17090311c300b001dd7d6ad6c8mr22060937plh.14.1710960151967; Wed, 20 Mar 2024 11:42:31 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id b16-20020a170902d51000b001dd091a4224sm11466752plg.61.2024.03.20.11.42.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Mar 2024 11:42:30 -0700 (PDT) Sender: Guenter Roeck Date: Wed, 20 Mar 2024 11:42:29 -0700 From: Guenter Roeck To: Kemeng Shi Cc: tytso@mit.edu, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, daniel.diaz@linaro.org, vmartensson@google.com Subject: Re: [PATCH v2 2/5] ext4: Add unit test of ext4_mb_generate_buddy Message-ID: References: <20240103104900.464789-1-shikemeng@huaweicloud.com> <20240103104900.464789-3-shikemeng@huaweicloud.com> <30a8ce01-84d1-48ef-a93d-d14cc61723e3@roeck-us.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <30a8ce01-84d1-48ef-a93d-d14cc61723e3@roeck-us.net> [ Adding more interested parties] On Wed, Mar 20, 2024 at 09:23:24AM -0700, Guenter Roeck wrote: > Hi, > > On Wed, Jan 03, 2024 at 06:48:57PM +0800, Kemeng Shi wrote: > > Add unit test of ext4_mb_generate_buddy > > > > Signed-off-by: Kemeng Shi > > With this and other new ext4 tests test in the tree, I see a variety > of backtraces in the upstream kernel if debug options are enabled. > An example is > > [ 6.821447] KTAP version 1 > [ 6.821769] # Subtest: test_mb_generate_buddy > [ 6.824787] ============================================================================= > [ 6.825568] BUG inode_cache (Tainted: G N): Padding overwritten. 0xfffff80006223f68-0xfffff80006223f6f @offset=16232 > ... > [ 6.894341] ok 7 ext4_inode_test > [ 6.895411] ============================================================================= > [ 6.895777] BUG inode_cache (Tainted: G B N): Padding overwritten. 0xfffff80006223f68-0xfffff80006223f6f @offset=16232 > > Another example, from another test run, is > > [ 3.938551] # Subtest: test_new_blocks_simple > [ 3.947171] ok 1 block_bits=10 cluster_bits=3 blocks_per_group=8192 group_count=4 desc_size=64 > [ 3.952988] ok 2 block_bits=12 cluster_bits=3 blocks_per_group=8192 group_count=4 desc_size=64 > [ 3.958403] ok 3 block_bits=16 cluster_bits=3 blocks_per_group=8192 group_count=4 desc_size=64 > [ 3.958890] ============================================================================= > [ 3.959159] BUG inode_cache (Tainted: G N): Padding overwritten. 0xffff8de881adbf68-0xffff8de881adbf6f @offset=16232 > > Another one: > > [ 18.730473] # Subtest: test_new_blocks_simple > [ 18.760547] ok 1 block_bits=10 cluster_bits=3 blocks_per_group=8192 group_count=4 desc_size=64 > [ 18.778477] ================================================================== > [ 18.778950] BUG: KFENCE: out-of-bounds write in ext4_mb_init+0x5d7/0xa60 > > This is just a sample, taken from a quick look at test results. > > Are those backtraces expected ? If so, would it be possible to execute the > tests without generating such backtraces ? The backtraces, if intentional, > hide real problems in the noise. > > Thanks, > Guenter