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Wed, 17 Jun 2026 14:56:42 +0000 Date: Wed, 17 Jun 2026 22:56:32 +0800 From: kernel test robot To: Jim Cromie , =?utf-8?Q?=C5=81ukasz?= Bartosik CC: , , Subject: [jimc:dd-rust-parse] [dyndbg] ccfcff60ec: BUG:kernel_NULL_pointer_dereference,address Message-ID: <202606172227.34266a1f-lkp@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline User-Agent: s-nail v14.9.25 X-ClientProxiedBy: KUZPR06CA0013.apcprd06.prod.outlook.com (2603:1096:d10:30::19) 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_|SA1PR11MB6847:EE_ X-MS-Office365-Filtering-Correlation-Id: e9684c9f-2ff9-4b63-5cad-08decc80a489 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|23010399003|1800799024|3023799007|11063799006|56012099006|18002099003; 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Hello, kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: ccfcff60ec48f9294257908cb027b3e29c8f7462 ("dyndbg: resolve "protection" of class'd pr_debug") https://github.com/jimc/linux.git dd-rust-parse in testcase: boot config: i386-randconfig-015-20260616 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/202606172227.34266a1f-lkp@intel.com [ 2.060784][ T1] BUG: kernel NULL pointer dereference, address: 00000000 [ 2.064447][ T1] #PF: supervisor read access in kernel mode [ 2.064447][ T1] #PF: error_code(0x0000) - not-present page [ 2.064447][ T1] *pde = 00000000 [ 2.064447][ T1] Oops: Oops: 0000 [#1] SMP [ 2.064447][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 7.1.0-rc7-00035-gccfcff60ec48 #1 PREEMPT(lazy) 4e5eb1741e72fd9e4b9a514cfdc887aab03908af [ 2.064447][ T1] EIP: strcmp+0x9/0x40 [ 2.064447][ T1] Code: 84 c0 75 f7 31 c0 aa 89 d8 5b 5e 5f 5d c3 8d 76 00 2e 8d b4 26 00 00 00 00 2e 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 c3 8d 76 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: c3 ret e: 8d 76 00 lea 0x0(%rsi),%esi 11: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi 18: 00 19: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi 20: 00 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: c3 ret 3e: 8d .byte 0x8d 3f: 76 .byte 0x76 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: c3 ret 14: 8d .byte 0x8d 15: 76 .byte 0x76 [ 2.064447][ T1] EAX: 00000000 EBX: c5c15680 ECX: 00000000 EDX: c45bc35a [ 2.064447][ T1] ESI: 00000000 EDI: c45bc35a EBP: c5d2fe88 ESP: c5d2fe80 [ 2.064447][ T1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010203 [ 2.064447][ T1] CR0: 80050033 CR2: 00000000 CR3: 05289000 CR4: 00040690 [ 2.064447][ T1] Call Trace: [ 2.064447][ T1] ddebug_add_module+0xbb/0x380 [ 2.064447][ T1] ? blocking_notifier_chain_register+0x2e/0x80 [ 2.064447][ T1] ? dynamic_debug_init_control+0x74/0x74 [ 2.064447][ T1] dynamic_debug_init+0xf2/0x208 [ 2.064447][ T1] ? dynamic_debug_init_control+0x74/0x74 [ 2.064447][ T1] do_one_initcall+0x59/0x3c0 [ 2.064447][ T1] ? __register_sysctl_table+0x101/0x140 [ 2.064447][ T1] ? rest_init+0x180/0x180 [ 2.064447][ T1] kernel_init_freeable+0x8f/0x114 [ 2.064447][ T1] kernel_init+0x12/0x100 [ 2.064447][ T1] ret_from_fork+0x228/0x2c0 [ 2.064447][ T1] ? rest_init+0x180/0x180 [ 2.064447][ T1] ret_from_fork_asm+0x12/0x18 [ 2.064447][ T1] entry_INT80_32+0x10d/0x10d [ 2.064447][ T1] Modules linked in: [ 2.064447][ T1] CR2: 0000000000000000 [ 2.064447][ T1] ---[ end trace 0000000000000000 ]--- [ 2.064447][ T1] EIP: strcmp+0x9/0x40 [ 2.064447][ T1] Code: 84 c0 75 f7 31 c0 aa 89 d8 5b 5e 5f 5d c3 8d 76 00 2e 8d b4 26 00 00 00 00 2e 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 c3 8d 76 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: c3 ret e: 8d 76 00 lea 0x0(%rsi),%esi 11: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi 18: 00 19: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi 20: 00 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: c3 ret 3e: 8d .byte 0x8d 3f: 76 .byte 0x76 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: c3 ret 14: 8d .byte 0x8d 15: 76 .byte 0x76 The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260617/202606172227.34266a1f-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki