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Tue, 2 Jun 2026 13:09:49 +0000 Date: Tue, 2 Jun 2026 21:09:42 +0800 From: kernel test robot To: Jim Cromie , =?utf-8?Q?=C5=81ukasz?= Bartosik CC: , , Subject: [jimc:dd-classmap-fix-3a] [dyndbg] 1aa71b32af: BUG:kernel_NULL_pointer_dereference,address Message-ID: <202606021631.50f520ba-lkp@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline User-Agent: s-nail v14.9.25 X-ClientProxiedBy: SI1PR02CA0027.apcprd02.prod.outlook.com (2603:1096:4:1f4::18) To PH0PR11MB5832.namprd11.prod.outlook.com (2603:10b6:510:141::7) Precedence: bulk X-Mailing-List: oe-lkp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH0PR11MB5832:EE_|SJ1PR11MB6227:EE_ X-MS-Office365-Filtering-Correlation-Id: a286424e-e60f-442e-0fd0-08dec0a83a0b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024|3023799007|56012099006|11063799006|18002099003; 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Hello, kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: 1aa71b32afe975c5402d381b16b95811b4ed16e4 ("dyndbg: resolve "protection" of class'd pr_debug") https://github.com/jimc/linux.git dd-classmap-fix-3a in testcase: boot config: i386-randconfig-011-20250530 compiler: gcc-14 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G (please refer to attached dmesg/kmsg for entire log/backtrace) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202606021631.50f520ba-lkp@intel.com [ 0.646324][ T1] BUG: kernel NULL pointer dereference, address: 00000000 [ 0.647608][ T1] #PF: supervisor read access in kernel mode [ 0.647608][ T1] #PF: error_code(0x0000) - not-present page [ 0.647608][ T1] *pde = 00000000 [ 0.647608][ T1] Oops: Oops: 0000 [#1] [ 0.647608][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 7.1.0-rc4-00035-g1aa71b32afe9 #1 PREEMPT(full) [ 0.647608][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 0.647608][ T1] EIP: strcmp (x86/lib/string_32.c:97) [ 0.647608][ T1] Code: 84 c0 75 f7 31 c0 aa 89 d8 5b 5e 5f 5d e9 ff a7 01 00 2e 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 55 89 e5 57 89 d7 56 89 c6 ae 75 08 84 c0 75 f8 31 c0 eb 04 19 c0 0c 01 5e 5f 5d e9 cf a7 All code ======== 0: 84 c0 test %al,%al 2: 75 f7 jne 0xfffffffffffffffb 4: 31 c0 xor %eax,%eax 6: aa stos %al,%es:(%rdi) 7: 89 d8 mov %ebx,%eax 9: 5b pop %rbx a: 5e pop %rsi b: 5f pop %rdi c: 5d pop %rbp d: e9 ff a7 01 00 jmp 0x1a811 12: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi 19: 00 1a: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 57 push %rdi 25: 89 d7 mov %edx,%edi 27: 56 push %rsi 28: 89 c6 mov %eax,%esi 2a:* ac lods %ds:(%rsi),%al <-- trapping instruction 2b: ae scas %es:(%rdi),%al 2c: 75 08 jne 0x36 2e: 84 c0 test %al,%al 30: 75 f8 jne 0x2a 32: 31 c0 xor %eax,%eax 34: eb 04 jmp 0x3a 36: 19 c0 sbb %eax,%eax 38: 0c 01 or $0x1,%al 3a: 5e pop %rsi 3b: 5f pop %rdi 3c: 5d pop %rbp 3d: e9 .byte 0xe9 3e: cf iret 3f: a7 cmpsl %es:(%rdi),%ds:(%rsi) Code starting with the faulting instruction =========================================== 0: ac lods %ds:(%rsi),%al 1: ae scas %es:(%rdi),%al 2: 75 08 jne 0xc 4: 84 c0 test %al,%al 6: 75 f8 jne 0x0 8: 31 c0 xor %eax,%eax a: eb 04 jmp 0x10 c: 19 c0 sbb %eax,%eax e: 0c 01 or $0x1,%al 10: 5e pop %rsi 11: 5f pop %rdi 12: 5d pop %rbp 13: e9 .byte 0xe9 14: cf iret 15: a7 cmpsl %es:(%rdi),%ds:(%rsi) [ 0.647608][ T1] EAX: 00000000 EBX: 45489340 ECX: 00000000 EDX: 43a5414a [ 0.647608][ T1] ESI: 00000000 EDI: 43a5414a EBP: 454a3e90 ESP: 454a3e88 [ 0.647608][ T1] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010217 [ 0.647608][ T1] CR0: 80050033 CR2: 00000000 CR3: 0440b000 CR4: 000006d0 [ 0.647608][ T1] Call Trace: [ 0.647608][ T1] ? ddebug_add_module (dynamic_debug.c:1479 (discriminator 13)) [ 0.647608][ T1] ? blocking_notifier_chain_register (notifier.c:265 notifier.c:282) [ 0.647608][ T1] ? dynamic_debug_init_control (dynamic_debug.c:1646) [ 0.647608][ T1] ? dynamic_debug_init (dynamic_debug.c:1693) [ 0.647608][ T1] ? dynamic_debug_init_control (dynamic_debug.c:1646) [ 0.647608][ T1] ? do_one_initcall (main.c:1392) [ 0.647608][ T1] ? __register_sysctl_init (proc/proc_sysctl.c:1436 proc/proc_sysctl.c:1465) [ 0.647608][ T1] ? init_mm_internals (vmstat.c:2298) [ 0.647608][ T1] ? kernel_init_freeable (main.c:1499 (discriminator 1) main.c:1692 (discriminator 1)) [ 0.647608][ T1] ? rest_init (main.c:762) [ 0.647608][ T1] ? kernel_init (main.c:1593) [ 0.647608][ T1] ? ret_from_fork (x86/kernel/process.c:158) [ 0.647608][ T1] ? rest_init (main.c:762) [ 0.647608][ T1] ? ret_from_fork_asm (x86/entry/entry_32.S:736) [ 0.647608][ T1] ? entry_INT80_32 (x86/entry/entry_32.S:940) [ 0.647608][ T1] Modules linked in: [ 0.647608][ T1] CR2: 0000000000000000 [ 0.647608][ T1] ---[ end trace 0000000000000000 ]--- [ 0.647608][ T1] EIP: strcmp (x86/lib/string_32.c:97) [ 0.647608][ T1] Code: 84 c0 75 f7 31 c0 aa 89 d8 5b 5e 5f 5d e9 ff a7 01 00 2e 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 55 89 e5 57 89 d7 56 89 c6 ae 75 08 84 c0 75 f8 31 c0 eb 04 19 c0 0c 01 5e 5f 5d e9 cf a7 All code ======== 0: 84 c0 test %al,%al 2: 75 f7 jne 0xfffffffffffffffb 4: 31 c0 xor %eax,%eax 6: aa stos %al,%es:(%rdi) 7: 89 d8 mov %ebx,%eax 9: 5b pop %rbx a: 5e pop %rsi b: 5f pop %rdi c: 5d pop %rbp d: e9 ff a7 01 00 jmp 0x1a811 12: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi 19: 00 1a: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 57 push %rdi 25: 89 d7 mov %edx,%edi 27: 56 push %rsi 28: 89 c6 mov %eax,%esi 2a:* ac lods %ds:(%rsi),%al <-- trapping instruction 2b: ae scas %es:(%rdi),%al 2c: 75 08 jne 0x36 2e: 84 c0 test %al,%al 30: 75 f8 jne 0x2a 32: 31 c0 xor %eax,%eax 34: eb 04 jmp 0x3a 36: 19 c0 sbb %eax,%eax 38: 0c 01 or $0x1,%al 3a: 5e pop %rsi 3b: 5f pop %rdi 3c: 5d pop %rbp 3d: e9 .byte 0xe9 3e: cf iret 3f: a7 cmpsl %es:(%rdi),%ds:(%rsi) Code starting with the faulting instruction =========================================== 0: ac lods %ds:(%rsi),%al 1: ae scas %es:(%rdi),%al 2: 75 08 jne 0xc 4: 84 c0 test %al,%al 6: 75 f8 jne 0x0 8: 31 c0 xor %eax,%eax a: eb 04 jmp 0x10 c: 19 c0 sbb %eax,%eax e: 0c 01 or $0x1,%al 10: 5e pop %rsi 11: 5f pop %rdi 12: 5d pop %rbp 13: e9 .byte 0xe9 14: cf iret 15: a7 cmpsl %es:(%rdi),%ds:(%rsi) The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260602/202606021631.50f520ba-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki