Received-SPF: pass (google.com: domain of linux-kernel+bounces-47521-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
Date: Thu, 1 Feb 2024 09:54:29 +0800
From: Oliver Sang <oliver.sang@intel.com>
To: Honglei Wang <wanghonglei@didichuxing.com>
CC: <oe-lkp@lists.linux.dev>, <lkp@intel.com>, <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>, <aubrey.li@linux.intel.com>,
	<yu.c.chen@intel.com>, Tiwei Bie <tiwei.btw@antgroup.com>, Abel Wu
	<wuyun.abel@bytedance.com>, <oliver.sang@intel.com>
Subject: Re: [linus:master] [sched/eevdf] 2227a957e1:
 BUG:kernel_NULL_pointer_dereference,address
Message-ID: <Zbr51SNYUpH2J+3z@xsang-OptiPlex-9020>
References: <ZbkDIlIR7qzPt7Vk@xsang-OptiPlex-9020>
 <cb384fac-0de0-4c11-8690-ec12c46da34c@didichuxing.com>
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
In-Reply-To: <cb384fac-0de0-4c11-8690-ec12c46da34c@didichuxing.com>
Precedence: bulk
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?3kw+Qr3tVIo7shpE6fc2v+UtCHSv0EqzbseQ5VpLNTyLTJe7Kloat5e/FLFj?=
 =?us-ascii?Q?Osxb1QE/VrN3WCORVWfvv6sqwPgUsYsQTcTAarF6O5lKnKzM7yRv3qGSBjC0?=
 =?us-ascii?Q?MP+9SWZiC7o8L7keyhs9oFuQ4cmzVJ8u0S2yv2i20O+t93P/G3JxUSc3+SQ8?=
 =?us-ascii?Q?WwH1xBuwS7IEt2Evjcj+SauHFj3T6xJOveTDQ7LfJ+YvjjTSegeW0utb26lP?=
 =?us-ascii?Q?ZAV9aouiJwbT/+GWRUDHstmnhLmSsEiEZEu4MvrOs21GCTBvRYdBqJKnr77O?=
 =?us-ascii?Q?dXKBfapJk9CaB+ovDI5qC3ThcOYAnv/ESJRiGQn8wV8xSJdfBvpghi3kHGS1?=
 =?us-ascii?Q?WdGI3u4Z7dX4CfbyjPoX1rPSQ7uoR03upmWZosKuNe4gwBQ8RFDfg/MyzRTn?=
 =?us-ascii?Q?NtHaOl033ONGuS8y6txXOhWde/w9wkVLNSlKjzNb88ezdZvlaIyyb4RI/8Pa?=
 =?us-ascii?Q?PNUDSxdroX/hp1bXsld4tyfHZS1jZEjAwNbL6dgZTlYrSfruV+ylztc9xauH?=
 =?us-ascii?Q?VsVNE7+JxelsWXdhxDdWg/g/zlxMDVe0rvD66utD6A1hd4uqpW5oxdMNFQNn?=
 =?us-ascii?Q?ZfMy0qvAVpzv0q5Kbsdv4KQDOO09ziOFCYeJbW7hX+ovp/3vM9kWDLnQ8qaG?=
 =?us-ascii?Q?dUCcc9broNhyBonKbWy6KwJ1LLB40EMfwRgUZ7mdZrDBknawpREkgIvjJYva?=
 =?us-ascii?Q?lZSFpbCDTQ8WmiYhP4jY4JFEvHEmyTfCFzn/VzPyb4+jwJ84PTqKHJzOZIOV?=
 =?us-ascii?Q?bAOhvQmyPOApcP5DVeemo7EYAVxLDaN1U2fCC/TBTq4PgXe3IOqD0g5pUy5O?=
 =?us-ascii?Q?AnEJ+YzVe9VrYIYUlDZ37yHLFxKF3NX8zAVqQL3mSH9fDuOFL/Ir2aagAkcb?=
 =?us-ascii?Q?UWO5mHwDFqZl+kvldKFhgZRyNjz+jtR4g3fY5e+ZpSLH7Jaz2M+QWnGMiJWo?=
 =?us-ascii?Q?UUnzWRNZt2lM9OJg4voCwg9Q1g3UXYpwx0iPzf0iqGLPIV5p7D7e8uoI/+hL?=
 =?us-ascii?Q?XqEf/+1gHI6cy181TUK9BCnYNoy4GC1htqjQ1frmPtJ5MRoszGvoeshRqqJs?=
 =?us-ascii?Q?J19eRL/lFl+VqehWvubr1e8FKiUj3891seVmofy9qTYzhnBF5UYoza3wnNM1?=
 =?us-ascii?Q?odbSAgkykvbi5CnuC9qPMQ23ZnDbyAQDaesgZHPiYm0tn0mCaYDzUxRWy2KA?=
 =?us-ascii?Q?MGu197Y2dpD4bdvOdddfZTSenW+mGhr3QTa/xsG6ml8CXx7Hj5uXyh860PfX?=
 =?us-ascii?Q?Rsj+s8K+jmc3Z6kFl+Dt0kWaipiuFaoIumNjTkPD+J76+fb0YgQZwwAAU3X0?=
 =?us-ascii?Q?tcDCUyVRM5wez0sdkdet/TM/UCNYgw245BwQe677/Vr5ZYsnpn0e5yusm6Gx?=
 =?us-ascii?Q?CleLaSDYm0v9esnI1glH6gibWNoUDjJnvV1TOE1NUOSe1AHFEDQVn0xLy2pU?=
 =?us-ascii?Q?RBrYTqXTYKw76g3Ffb41DvtEEcvESsbYg8HNFJmCubSnjO9f01moX3/COfrp?=
 =?us-ascii?Q?jYQNdPkVUKMNuj4DqMuOJ2ei07xty/JInm8HbJPzoteK5qvrgpkL+oOlFyyY?=
 =?us-ascii?Q?6JI5yejjKvgv1FJ32202+GkynGyVOjLkPu901EcNJcb3o1k3VihvbLr6f5Ld?=
 =?us-ascii?Q?xA=3D=3D?=
X-MS-Exchange-CrossTenant-Network-Message-Id: eb9f5866-94e8-42ef-8830-08dc22c8bfc6
X-MS-Exchange-CrossTenant-AuthSource: LV3PR11MB8603.namprd11.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Feb 2024 01:54:38.6713
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: mO13AQfznf4xlioJVa87MHgSkY1JJuloQuVlT5LwboYxZsE8u7c+vdvtpr6vqK++TJw9uUxIWRZdLHDmiE93Jw==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR11MB6116
X-OriginatorOrg: intel.com

hi, Honglei,

On Thu, Feb 01, 2024 at 09:29:30AM +0800, Honglei Wang wrote:
> 
> 
> On 2024/1/30 22:09, Oliver Sang wrote:
> > hi, Abel,
> > 
> > On Tue, Jan 30, 2024 at 06:13:32PM +0800, Abel Wu wrote:
> > > On 1/30/24 3:24 PM, kernel test robot Wrote:
> > > > 
> > > > 
> > > > Hello,
> > > > 
> > > > (besides a previous performance report),
> > > > kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on:
> > > > 
> > > > commit: 2227a957e1d5b1941be4e4207879ec74f4bb37f8 ("sched/eevdf: Sort the rbtree by virtual deadline")
> > > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> > > > 
> > > > [test failed on linus/master 3a5879d495b226d0404098e3564462d5f1daa33b]
> > > > [test failed on linux-next/master 01af33cc9894b4489fb68fa35c40e9fe85df63dc]
> > > > 
> > > > in testcase: trinity
> > > > version: trinity-i386-abe9de86-1_20230429
> 
> Hi Oliver,
> 
> I'm a bit curious, did the problem happen on i386 only? Did you hit it on
> x86_64 or other platform with the same trinity testcases?

we did not observe same issue on x86_64 so far.

we can run performance tests with this commit on x86_64 (compiled with gcc-12).
FYI, we sent out a performance report before this crash one.

https://lore.kernel.org/all/202401292151.829b01b0-oliver.sang@intel.com/

> 
> Thanks,
> Honglei