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Fri, 19 Jul 2024 12:04:31 +0000 Received: from PH8PR10MB6290.namprd10.prod.outlook.com ([fe80::309b:26bb:11d5:cc76]) by PH8PR10MB6290.namprd10.prod.outlook.com ([fe80::309b:26bb:11d5:cc76%7]) with mapi id 15.20.7784.017; Fri, 19 Jul 2024 12:04:31 +0000 Message-ID: <3bd6b12c-533c-4b6d-bc91-696db8837b3e@oracle.com> Date: Fri, 19 Jul 2024 17:34:23 +0530 User-Agent: Mozilla Thunderbird Subject: Re: Bug related with a 6.6.24 platform/x86 commit signed by you - Enormous memory leak To: Max Dubois , "ilpo.jarvinen@linux.intel.com" Cc: "gregkh@linuxfoundation.org" , Dan Carpenter , Dan Carpenter , LKML References: <707784492.392759.1721383145890.ref@mail.yahoo.com> <707784492.392759.1721383145890@mail.yahoo.com> Content-Language: en-US From: Harshit Mogalapalli In-Reply-To: <707784492.392759.1721383145890@mail.yahoo.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SI1PR02CA0035.apcprd02.prod.outlook.com (2603:1096:4:1f6::8) To PH8PR10MB6290.namprd10.prod.outlook.com (2603:10b6:510:1c1::7) 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: PH8PR10MB6290:EE_|MN2PR10MB4288:EE_ X-MS-Office365-Filtering-Correlation-Id: 150d27b2-3c49-46e6-5368-08dca7eaf292 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; 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This is a nasty bug and I think it is > related to this committed on 6.6.24 and it is still present from that > kernel to even 6.6.10 only in 32 Linux machines with over 32 bit kernels > (tested by me on virtualbox and Vmware guests, I don't have real 32 bit > machines to test it): > > commit 9a98ab01e3acba830cb0917296a13192fd23f305 > Author: Harshit Mogalapalli > Date:   Mon Nov 13 12:07:39 2023 -0800 > >     platform/x86: hp-bioscfg: Fix error handling in > hp_add_other_attributes() > >     commit f40f939917b2b4cbf18450096c0ce1c58ed59fae upstream. > >     'attr_name_kobj' is allocated using kzalloc, but on all the error paths >     it is not freed, hence we have a memory leak. > >     Fix the error path before kobject_init_and_add() by adding kfree(). > >     kobject_put() must be always called after passing the object to >     kobject_init_and_add(). Only the error path which is immediately next >     to kobject_init_and_add() calls kobject_put() and not any other error >     path after it. > >     Fix the error handling after kobject_init_and_add() by moving the >     kobject_put() into the goto label err_other_attr_init that is already >     used by all the error paths after kobject_init_and_add(). > >     Fixes: a34fc329b189 ("platform/x86: hp-bioscfg: bioscfg") >     Cc: stable@vger.kernel.org # 6.6.x: c5dbf0416000: platform/x86: > hp-bioscfg: Simplify return check in hp_add_other_attributes() >     Cc: stable@vger.kernel.org # 6.6.x: 5736aa9537c9: platform/x86: > hp-bioscfg: move mutex_lock() down in hp_add_other_attributes() >     Reported-by: kernel test robot >     Reported-by: Dan Carpenter >     Closes: https://lore.kernel.org/r/202309201412.on0VXJGo-lkp@intel.com/ >     Signed-off-by: Harshit Mogalapalli >     [ij: Added the stable dep tags] >     Reviewed-by: Ilpo Järvinen >     Link: > https://lore.kernel.org/r/20231113200742.3593548-3-harshit.m.mogalapalli@oracle.com >     Signed-off-by: Ilpo Järvinen >     Signed-off-by: Greg Kroah-Hartman > > I reported this on Gentoo forums in this discussion: > > https://forums.gentoo.org/viewtopic-p-8834077.html#8834077 > > > In this days 32 bit machines are pretty much unused and I think this is > the reason becouse no one reported it. > > The bug wasn't present in kernels before 6.6.24 (example: 6.6.23 is ok). > Thanks for reporting and sendine me an email. The commit you pointed out which is authored by me is in: v6.6.4 - 9a98ab01e3ac platform/x86: hp-bioscfg: Fix error handling in hp_add_other_attributes() So you should have seen this in 6.6.4 as well ? > The bug wasn't present in kernels before 6.6.24 (example: 6.6.23 is ok). This confused me, as the commit that you pointed out is present since 6.6.4 > I tested it in various VMware and Virtualbox guests and it is very easy > to reproduce it. > > You just need a VM with x86 emulated processor, over 1 GB of RAM and run > some applications like few terminals, a web browser and audio player. > > In the log you will see a lot of complains related to vmalloc > allocations not present on working kernels before 6.6.24 and this > commitment. > > Increasing vmalloc like suggested in the log, doesn't help. > > Starting from this point the VM become unresponsive, it close apps, in > doesn't open others, terminals can't execute simple commands. Sometimes > you are even unable to reboot and sometimes the machines freeze, > sometimes they go in total kernel exception. > > This happen 100 per 100 of the time, it is easy to reproduce it > everytime on any kernel 6.6.24 or more (6.7, 6.8, 6.9 and 6.10 are all > affected). > > Considering the kernel is supposed to support 32 bit I think this is > something to fix it then I don't know how and to who point this bug too. > I couldn't quickly reason out how this error handling fix, but I think this might be due to another commit as well. By 6.6.23/24 which branch are you referring to, upstream stable branch that Greg maintains correct ? $ git log --oneline v6.6.23..v6.6.24 drivers/platform/ e8fc78a1c70f platform/x86/intel/tpmi: Change vsec offset to u64 I don't see my above commit in the log between 6.6.23 and 6.6.24 Could you please clarify ? > > Thankx for reading and to help to resolve this really nasty bug! Thanks, Harshit > > MD >