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Mon, 14 Oct 2024 04:38:49 +0000 Date: Mon, 14 Oct 2024 12:38:39 +0800 From: Feng Tang To: "V, Narasimhan" , Vlastimil Babka CC: Linux Next Mailing List , "linux-mm@kvack.org" , Borislav Petkov Subject: Re: WARNING: CPU: 43 PID: 2254 at mm/slub.c:4655 krealloc_noprof+0x2c7/0x300 with next-20241003 Message-ID: References: Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: KL1PR02CA0015.apcprd02.prod.outlook.com (2603:1096:820:c::20) To MN0PR11MB6304.namprd11.prod.outlook.com (2603:10b6:208:3c0::7) Precedence: bulk X-Mailing-List: linux-next@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN0PR11MB6304:EE_|MW6PR11MB8312:EE_ X-MS-Office365-Filtering-Correlation-Id: a1fdcb67-8f9f-40e2-3e99-08dcec0a1919 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?rpJlLkZ7otMKNUGP3hE/cnYF2xH+EhDLECheeA9yig2bf+VFPpWv6T+08kaD?= =?us-ascii?Q?c7GnquHus9iIztBBVOAcfz9FIjWpl+eqX6G9f4qbdB/yskPTGt5vML7LmkTr?= =?us-ascii?Q?kqRsUfgca04WKCHRQGGuBiZZyA+V2ENC1aT7+RG4oxUkfDqEf+xBJXyukNZG?= =?us-ascii?Q?L7ARxMW+4P8iiPXrYu9O2d9fe8P4a884mJAVjAP3sU9V2CGu6q3DZbMG1UmR?= =?us-ascii?Q?8ONvi6JclqH39s9dIrU4+q3NL3LXwttwlN9+se696Xl13qIw43bOA3Lk+VfC?= =?us-ascii?Q?Fk9l+2hquVzt41xccp1rauQqe0+If7MpVUTUQ3Fw18NGnC0eil2i8R6Bsdne?= =?us-ascii?Q?N/QvjM6Yo8BGFsdfWpic6ObrLwzycVW1bEeeNVbEF/HXjMVDh4hFhb81ypb+?= =?us-ascii?Q?jLlry48LYBTi7I3UL6VjvK57T9Qpnz/WtSiHDLWOXoR6BBtelChQ5zhUIlGc?= =?us-ascii?Q?QDPPoL3HKhJ7NUQrEzG561kJsaI34/50iwsAK4AB/ve69WSgOcpKbP1kHWQN?= =?us-ascii?Q?gy7AN0CsrCQB06taNxP5j31tJs/G8LMWcSe/kfTxYDbGCh0KguG4OUfLkpQi?= =?us-ascii?Q?o6dhwasPgSdvA1Yz/ajxLbf1oSG70QA0u7JlZmZWpw/RebYnKjDEl6Kf/PCq?= =?us-ascii?Q?FHb9fFND6XZ/H2lwMWAUfnPFvsnElg9X5OtXM6Ltgh6ZVe+rqScaytN5XJAl?= =?us-ascii?Q?zVNUeuyRARI97628gCdFjwUEoUq8uqpiWv0TdiBQWNnEBgMZQc5MIivGL45Q?= =?us-ascii?Q?xBdD8KQO7i8ntgiaeEzVrOY7dZtJfPIzN+REPIkE0g02IQ0tsRFUrtQEKHaa?= =?us-ascii?Q?iyIf038G1KZA1l+B/0YLwPREqk+/dYH5UDuwubngcy73WC288OWMYMHsTbku?= =?us-ascii?Q?PnQ2gx1XSwvTEB9o+jZL+ouyi84yFvGMIKD0PGTqNB63IfzELYwFzkXbHygN?= =?us-ascii?Q?UyQpKYNoGBHLO4kNzpopmcLdDb1oru8AOmq0BbfdQJqQOY4lgOhybYNFciMX?= =?us-ascii?Q?U0AZUTQhIH3IG0i/fHZetW0IEWlCqrXUUT+2nWSMsAv2aaw8/oYjrR5oHhjF?= =?us-ascii?Q?TWUP7sVbtH0sqjSsNy754mk8ePkegACdbwzkv2HQz7oDHob2ad1YJifPK4wB?= =?us-ascii?Q?4DUC6QhMBp7/3FKaQHRYFnkMBFjOGTlpAVo17133tE26z73X8ctg27u5roy5?= =?us-ascii?Q?+aRy/2zPoWK+PW26UvLhWLU0fd8hNTeRP7nY0Nc3BT2g2HskgQcFAxp++2Oi?= =?us-ascii?Q?beCEUROIEBkSAfYO6rgHM3L+COh70WWFgPiwYaCK+w=3D=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MN0PR11MB6304.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(366016)(376014);DIR:OUT;SFP:1101; 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On Mon, Oct 07, 2024 at 06:35:42AM +0000, V, Narasimhan wrote: > >> Hi, > >> > >> Seeing the following bug on boot with next-20241003 > > > I think it is caused by my commit d0a38fad51cc "mm/slub: Improve redzone check and zeroing for > krealloc()" > > that the virt_to_cache() it calls returns NULL > > > Could you share your kernel config? Is KFENCE enabled? > > Yes, KFENCE is enabled. > > Here is the kernel config used. > CONFIG_HAVE_ARCH_KASAN=y > CONFIG_HAVE_ARCH_KASAN_VMALLOC=y > CONFIG_CC_HAS_KASAN_GENERIC=y > CONFIG_CC_HAS_WORKING_NOSANITIZE_ADDRESS=y > # CONFIG_KASAN is not set > CONFIG_HAVE_ARCH_KFENCE=y > CONFIG_KFENCE=y > CONFIG_KFENCE_SAMPLE_INTERVAL=0 I think this effectively disables the kfence, so it should be the large kmalloc case, as Vlastimil said in the other mail. We will try to address it in v3 patches. Thanks, Feng > CONFIG_KFENCE_NUM_OBJECTS=255 > # CONFIG_KFENCE_DEFERRABLE is not set > # CONFIG_KFENCE_STATIC_KEYS is not set > CONFIG_KFENCE_STRESS_TEST_FAULTS=0 > CONFIG_HAVE_ARCH_KMSAN=y > # end of Memory Debugging >