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Tue, 12 Aug 2025 01:30:18 +0000 Date: Tue, 12 Aug 2025 09:30:01 +0800 From: kernel test robot To: Chen Yu CC: , , , , , , Peter Zijlstra , Ingo Molnar , K Prateek Nayak , "Gautham R . Shenoy" , Vincent Guittot , Juri Lelli , "Dietmar Eggemann" , Steven Rostedt , Ben Segall , Mel Gorman , "Valentin Schneider" , Libo Chen , "Madadi Vineeth Reddy" , Hillf Danton , Shrikanth Hegde , Jianyong Wu , Yangyu Chen , Tingyin Duan , Vern Hao , Len Brown , Tim Chen , Aubrey Li , Zhao Liu , Chen Yu , Subject: Re: [RFC PATCH v4 01/28] sched: Cache aware load-balancing Message-ID: <202508111054.58c525c-lkp@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <9157186cf9e3fd541f62c637579ff736b3704c51.1754712565.git.tim.c.chen@linux.intel.com> X-ClientProxiedBy: SGBP274CA0016.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:b0::28) To LV3PR11MB8603.namprd11.prod.outlook.com (2603:10b6:408:1b6::9) 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: LV3PR11MB8603:EE_|IA1PR11MB8830:EE_ X-MS-Office365-Filtering-Correlation-Id: 39d74334-32a5-4aca-f5d7-08ddd93fcba9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|366016; 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[ 18.119966][ T1] f71882fg: Not a Fintek device [ 18.120517][ T1] f71882fg: Not a Fintek device [ 18.142462][ T63] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000012: 0000 [#1] SMP KASAN [ 18.144289][ T63] KASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097] [ 18.145594][ T63] CPU: 0 UID: 0 PID: 63 Comm: modprobe Not tainted 6.16.0-00001-g2ae6ef14dace #1 PREEMPT(none) [ 18.146207][ T63] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 18.146207][ T63] RIP: 0010:_find_next_bit (kbuild/src/consumer/lib/find_bit.c:156 (discriminator 2)) [ 18.146207][ T63] Code: 48 89 d3 48 83 c8 ff 83 e2 3f 49 89 fe 48 c1 eb 06 c4 62 e9 f7 e8 b8 ff ff 37 00 4c 8d 3c df 48 c1 e0 2a 4c 89 fa 48 c1 ea 03 <80> 3c 02 00 74 08 4c 89 ff e8 cc 76 52 ff 49 8b 07 4c 21 e8 49 bd All code ======== 0: 48 89 d3 mov %rdx,%rbx 3: 48 83 c8 ff or $0xffffffffffffffff,%rax 7: 83 e2 3f and $0x3f,%edx a: 49 89 fe mov %rdi,%r14 d: 48 c1 eb 06 shr $0x6,%rbx 11: c4 62 e9 f7 e8 shlx %rdx,%rax,%r13 16: b8 ff ff 37 00 mov $0x37ffff,%eax 1b: 4c 8d 3c df lea (%rdi,%rbx,8),%r15 1f: 48 c1 e0 2a shl $0x2a,%rax 23: 4c 89 fa mov %r15,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx 2a:* 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ff mov %r15,%rdi 33: e8 cc 76 52 ff call 0xffffffffff527704 38: 49 8b 07 mov (%r15),%rax 3b: 4c 21 e8 and %r13,%rax 3e: 49 rex.WB 3f: bd .byte 0xbd Code starting with the faulting instruction =========================================== 0: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 4: 74 08 je 0xe 6: 4c 89 ff mov %r15,%rdi 9: e8 cc 76 52 ff call 0xffffffffff5276da e: 49 8b 07 mov (%r15),%rax 11: 4c 21 e8 and %r13,%rax 14: 49 rex.WB 15: bd .byte 0xbd [ 18.146207][ T63] RSP: 0000:ffffc900001f7d28 EFLAGS: 00010206 [ 18.146207][ T63] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: fffffbfff0bdd81a [ 18.146207][ T63] RDX: 0000000000000012 RSI: 0000000000000002 RDI: 0000000000000090 [ 18.146207][ T63] RBP: ffffc900001f7d50 R08: 0000000000000000 R09: 0000000000000003 [ 18.146207][ T63] R10: ffffffff8145362f R11: ffffed103099ffd5 R12: 0000000000000002 [ 18.146207][ T63] R13: ffffffffffffffff R14: 0000000000000090 R15: 0000000000000090 [ 18.146207][ T63] FS: 0000000000000000(0000) GS:ffff888428798000(0000) knlGS:0000000000000000 [ 18.146207][ T63] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 18.146207][ T63] CR2: 00000000f7fc18c8 CR3: 0000000185368000 CR4: 00000000000406b0 [ 18.146207][ T63] Call Trace: [ 18.146207][ T63] [ 18.146207][ T63] task_cache_work (kbuild/src/consumer/include/linux/find.h:71 (discriminator 2) kbuild/src/consumer/kernel/sched/fair.c:1325 (discriminator 2)) [ 18.146207][ T63] ? _raw_spin_unlock_irq (kbuild/src/consumer/arch/x86/include/asm/paravirt.h:671 kbuild/src/consumer/include/linux/spinlock_api_smp.h:159 kbuild/src/consumer/kernel/locking/spinlock.c:202) [ 18.146207][ T63] ? __pfx_task_cache_work (kbuild/src/consumer/kernel/sched/fair.c:1299) [ 18.146207][ T63] ? __this_cpu_preempt_check (kbuild/src/consumer/lib/smp_processor_id.c:67) The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250811/202508111054.58c525c-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki