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Fri, 24 Jan 2025 08:13:40 +0000 Received: from DM4PR10MB6886.namprd10.prod.outlook.com ([fe80::bdcc:98f5:ebd5:cd38]) by DM4PR10MB6886.namprd10.prod.outlook.com ([fe80::bdcc:98f5:ebd5:cd38%5]) with mapi id 15.20.8377.009; Fri, 24 Jan 2025 08:13:40 +0000 Message-ID: <48589759-88c1-4d13-9f08-321484180a7f@oracle.com> Date: Fri, 24 Jan 2025 13:43:31 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [REGRESSION] kernel panic at bitmap_get_stats+0x2b/0xa0 since 6.12 To: Yu Kuai , LKML , linux-raid@vger.kernel.org, mariusz.tkaczyk@linux.intel.com, song@kernel.org, pmenzel@molgen.mpg.de Cc: Himanshu Madhani , "regressions@lists.linux.dev" , "stable@vger.kernel.org" , Darren Kenny , "yukuai (C)" References: <6b72aec8-cc23-27d1-38ae-827bf800f21d@huaweicloud.com> Content-Language: en-US From: Harshit Mogalapalli In-Reply-To: <6b72aec8-cc23-27d1-38ae-827bf800f21d@huaweicloud.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: KU1PR03CA0004.apcprd03.prod.outlook.com (2603:1096:802:18::16) To DM4PR10MB6886.namprd10.prod.outlook.com (2603:10b6:8:102::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR10MB6886:EE_|CH3PR10MB6859:EE_ X-MS-Office365-Filtering-Correlation-Id: 15f53de2-144c-4714-d4c5-08dd3c4f025c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014; 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After applying the below patch the problem is not reproducible anymore. The boot succeeds without panic. Regards, Harshit > Thanks, > > diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c > index 63879582d1c3..e01c2d0479e3 100644 > --- a/drivers/md/md-bitmap.c > +++ b/drivers/md/md-bitmap.c > @@ -2340,7 +2340,10 @@ static int bitmap_get_stats(void *data, struct > md_bitmap_stats *stats) > >         if (!bitmap) >                 return -ENOENT; > - > +       if (bitmap->mddev->bitmap_info.external) > +               return -ENOENT; > +       if (!bitmap->storage.sb_page) /* no superblock */ > +               return -EINVAL; >         sb = kmap_local_page(bitmap->storage.sb_page); >         stats->sync_size = le64_to_cpu(sb->sync_size); >         kunmap_local(sb); > diff --git a/drivers/md/md.c b/drivers/md/md.c > index 94166b2e9512..c9de57701e43 100644 > --- a/drivers/md/md.c > +++ b/drivers/md/md.c > @@ -8470,6 +8470,10 @@ static int md_seq_show(struct seq_file *seq, void > *v) >                 return 0; > >         spin_unlock(&all_mddevs_lock); > + > +       /* prevent bitmap to be freed after checking */ > +       mutex_lock(&mddev->bitmap_info.mutex); > + >         spin_lock(&mddev->lock); >         if (mddev->pers || mddev->raid_disks || !list_empty(&mddev- > >disks)) { >                 seq_printf(seq, "%s : ", mdname(mddev)); > @@ -8545,6 +8549,7 @@ static int md_seq_show(struct seq_file *seq, void *v) >                 seq_printf(seq, "\n"); >         } >         spin_unlock(&mddev->lock); > +       mutex_unlock(&mddev->bitmap_info.mutex); >         spin_lock(&all_mddevs_lock); > >         if (mddev == list_last_entry(&all_mddevs, struct mddev, > all_mddevs)) >