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X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Jan 2026 06:08:22.6211 (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: T+hIABdyWGRK82YbUPKgwxtXFIKw8Rr2N5nK36Ay750laXPiDJH3jiuoaq41vV3Cw6CDYV2UZEHz+WBeHWxXlQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ5PPF5CBB3CBCE X-OriginatorOrg: intel.com Hello, kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: 1663ffb9c19cba56a091fac48e06e248f009be26 ("dyndbg: resolve "protection" of class'd pr_debug") https://github.com/jimc/linux.git dd-shrink in testcase: boot config: i386-randconfig-015-20260120 compiler: clang-20 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G (please refer to attached dmesg/kmsg for entire log/backtrace) +---------------------------------------------+------------+------------+ | | 9d6b17ecee | 1663ffb9c1 | +---------------------------------------------+------------+------------+ | boot_successes | 12 | 0 | | boot_failures | 0 | 12 | | BUG:kernel_NULL_pointer_dereference,address | 0 | 12 | | Oops | 0 | 12 | | EIP:strcmp | 0 | 12 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 12 | +---------------------------------------------+------------+------------+ 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/202601211325.7e1f336-lkp@intel.com [ 1.266156][ T1] BUG: kernel NULL pointer dereference, address: 00000000 [ 1.267870][ T1] #PF: supervisor read access in kernel mode [ 1.269056][ T1] #PF: error_code(0x0000) - not-present page [ 1.269056][ T1] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 [ 1.269056][ T1] Oops: Oops: 0000 [#1] SMP [ 1.269056][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G T 6.19.0-rc6-00029-g1663ffb9c19c #1 PREEMPT(lazy) d32193f03a93c27f95904822137a3e5139e15ea4 [ 1.269056][ T1] Tainted: [T]=RANDSTRUCT [ 1.269056][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 1.269056][ T1] EIP: strcmp (arch/x86/lib/string_32.c:97) [ 1.269056][ T1] Code: 06 ac aa 84 c0 75 f7 31 c0 aa 89 d8 83 c4 04 5e 5f 5b 5d 31 c9 31 d2 c3 90 90 90 90 90 90 90 90 90 55 89 e5 57 56 89 d7 89 c6 ae 75 08 84 c0 75 f8 31 c0 eb 04 19 c0 0c 01 5e 5f 5d 31 d2 c3 All code ======== 0: 06 (bad) 1: ac lods %ds:(%rsi),%al 2: aa stos %al,%es:(%rdi) 3: 84 c0 test %al,%al 5: 75 f7 jne 0xfffffffffffffffe 7: 31 c0 xor %eax,%eax 9: aa stos %al,%es:(%rdi) a: 89 d8 mov %ebx,%eax c: 83 c4 04 add $0x4,%esp f: 5e pop %rsi 10: 5f pop %rdi 11: 5b pop %rbx 12: 5d pop %rbp 13: 31 c9 xor %ecx,%ecx 15: 31 d2 xor %edx,%edx 17: c3 ret 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 57 push %rdi 25: 56 push %rsi 26: 89 d7 mov %edx,%edi 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: 31 d2 xor %edx,%edx 3f: c3 ret 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: 31 d2 xor %edx,%edx 15: c3 ret [ 1.269056][ T1] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000 [ 1.269056][ T1] ESI: 00000000 EDI: 00000000 EBP: 46981c84 ESP: 46981c7c [ 1.269056][ T1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010246 [ 1.269056][ T1] CR0: 80050033 CR2: 00000000 CR3: 05e58000 CR4: 000406b0 [ 1.269056][ T1] Call Trace: [ 1.269056][ T1] ? dynamic_debug_init (lib/dynamic_debug.c:1651) [ 1.269056][ T1] ? rest_init (init/main.c:1570) [ 1.269056][ T1] ? do_one_initcall (init/main.c:1378) [ 1.269056][ T1] ? __lock_acquire (kernel/locking/lockdep.c:4674) [ 1.269056][ T1] ? xas_create (include/linux/xarray.h:1217 (discriminator 2)) [ 1.269056][ T1] ? lock_acquire (kernel/locking/lockdep.c:5868) [ 1.269056][ T1] ? __register_sysctl_table (fs/proc/proc_sysctl.c:1399) [ 1.269056][ T1] ? __register_sysctl_table (fs/proc/proc_sysctl.c:1399) [ 1.269056][ T1] ? _raw_spin_unlock (arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) [ 1.269056][ T1] ? __register_sysctl_table (fs/proc/proc_sysctl.c:1399) [ 1.269056][ T1] ? rest_init (init/main.c:1570) [ 1.269056][ T1] ? dyndbg_setup (lib/dynamic_debug.c:1612) [ 1.269056][ T1] ? rest_init (init/main.c:1570) [ 1.269056][ T1] ? do_pre_smp_initcalls (init/main.c:1483 (discriminator 2)) [ 1.269056][ T1] ? rest_init (init/main.c:1570) [ 1.269056][ T1] ? kernel_init_freeable (init/main.c:1678) [ 1.269056][ T1] ? kernel_init (init/main.c:1580) [ 1.269056][ T1] ? ret_from_fork (arch/x86/kernel/process.c:164) [ 1.269056][ T1] ? rest_init (init/main.c:1570) [ 1.269056][ T1] ? ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 1.269056][ T1] ? entry_INT80_32 (arch/x86/entry/entry_32.S:945) [ 1.269056][ T1] Modules linked in: [ 1.269056][ T1] CR2: 0000000000000000 [ 1.269056][ T1] ---[ end trace 0000000000000000 ]--- [ 1.269056][ T1] EIP: strcmp (arch/x86/lib/string_32.c:97) [ 1.269056][ T1] Code: 06 ac aa 84 c0 75 f7 31 c0 aa 89 d8 83 c4 04 5e 5f 5b 5d 31 c9 31 d2 c3 90 90 90 90 90 90 90 90 90 55 89 e5 57 56 89 d7 89 c6 ae 75 08 84 c0 75 f8 31 c0 eb 04 19 c0 0c 01 5e 5f 5d 31 d2 c3 All code ======== 0: 06 (bad) 1: ac lods %ds:(%rsi),%al 2: aa stos %al,%es:(%rdi) 3: 84 c0 test %al,%al 5: 75 f7 jne 0xfffffffffffffffe 7: 31 c0 xor %eax,%eax 9: aa stos %al,%es:(%rdi) a: 89 d8 mov %ebx,%eax c: 83 c4 04 add $0x4,%esp f: 5e pop %rsi 10: 5f pop %rdi 11: 5b pop %rbx 12: 5d pop %rbp 13: 31 c9 xor %ecx,%ecx 15: 31 d2 xor %edx,%edx 17: c3 ret 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 57 push %rdi 25: 56 push %rsi 26: 89 d7 mov %edx,%edi 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: 31 d2 xor %edx,%edx The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260121/202601211325.7e1f336-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki