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e8709d8f-4af3-4794-0913-08dea528e19b X-MS-Exchange-CrossTenant-AuthSource: PH0PR11MB5832.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Apr 2026 13:20:13.8033 (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: D5ZD6zKxU2c/RmkKDlLtVPJNUz1vrkOFltsJ879P54AzolHj++jgsWI/fvM5BYJvrE/5ZNyNAYS8m0D0PKsiuQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM3PR11MB8715 X-OriginatorOrg: intel.com Hello, this report is just FYI. the randconfig we used in this test has the expected difference. ==================== PARENT FIRST_BAD KCONFIGS bc7cb75552bb5191e9ac9f20e310d9b1858bc4aa ==================== --- /pkg/linux/i386-randconfig-015-20260120/gcc-14/bc7cb75552bb5191e9ac9f20e310d9b1858bc4aa/.config 2026-04-25 03:39:53.302787330 +0800 +++ /pkg/linux/i386-randconfig-015-20260120/gcc-14/a3facbf7db65b559049a9e91ad6fc70a62e99311/.config 2026-04-25 04:18:41.893668590 +0800 @@ -4210,7 +4210,7 @@ CONFIG_DRM=y # # DRM debugging options # -# CONFIG_DRM_USE_DYNAMIC_DEBUG is not set +CONFIG_DRM_USE_DYNAMIC_DEBUG=y # CONFIG_DRM_WERROR is not set CONFIG_DRM_DEBUG_MM=y CONFIG_DRM_KUNIT_TEST_HELPERS=m after CONFIG_DRM_USE_DYNAMIC_DEBUG enabled, we noticed crash mentioned in below report. kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: a3facbf7db65b559049a9e91ad6fc70a62e99311 ("drm-dyndbg: set CONFIG_DRM_USE_DYNAMIC_DEBUG=y") https://github.com/jimc/linux.git jump-batch in testcase: boot config: i386-randconfig-015-20260120 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/202604282018.c2caa8e7-lkp@intel.com [ 0.362826][ T1] BUG: kernel NULL pointer dereference, address: 00000000 [ 0.363389][ T1] #PF: supervisor read access in kernel mode [ 0.363855][ T1] #PF: error_code(0x0000) - not-present page [ 0.364322][ T1] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 [ 0.364864][ T1] Oops: Oops: 0000 [#1] SMP [ 0.365217][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G T 7.0.0-rc5-00065-ga3facbf7db65 #1 PREEMPT(lazy) d5dc0e24f12a8efb7de0b5a998078c56d56aaad7 [ 0.365732][ T1] Tainted: [T]=RANDSTRUCT [ 0.365732][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 0.365732][ T1] EIP: strcmp (arch/x86/lib/string_32.c:97) [ 0.365732][ T1] Code: 84 c0 75 f7 31 c0 aa 89 d8 5b 5e 5f 5d 31 d2 31 c9 c3 8d 76 00 2e 8d b4 26 00 00 00 00 8d 74 26 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 31 d2 c3 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: 31 d2 xor %edx,%edx f: 31 c9 xor %ecx,%ecx 11: c3 ret 12: 8d 76 00 lea 0x0(%rsi),%esi 15: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi 1c: 00 1d: 8d 74 26 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: 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 [ 0.365732][ T1] EAX: 00000000 EBX: 467dad14 ECX: 00000015 EDX: 45b9de29 [ 0.365732][ T1] ESI: 00000000 EDI: 45b9de29 EBP: 4762de70 ESP: 4762de68 [ 0.365732][ T1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010293 [ 0.365732][ T1] CR0: 80050033 CR2: 00000000 CR3: 06999000 CR4: 000406b0 [ 0.365732][ T1] Call Trace: [ 0.365732][ T1] ? ddebug_add_module (lib/dynamic_debug.c:1473 (discriminator 8)) [ 0.365732][ T1] ? __lock_release+0x43/0x140 [ 0.365732][ T1] ? blocking_notifier_chain_register (kernel/notifier.c:265 kernel/notifier.c:282) [ 0.365732][ T1] ? up_write (kernel/locking/rwsem.c:1643) [ 0.365732][ T1] ? blocking_notifier_chain_register (kernel/notifier.c:265 kernel/notifier.c:282) [ 0.365732][ T1] ? dynamic_debug_init_control (lib/dynamic_debug.c:1669) [ 0.365732][ T1] ? dynamic_debug_init (lib/dynamic_debug.c:1716) [ 0.365732][ T1] ? dynamic_debug_init_control (lib/dynamic_debug.c:1669) [ 0.365732][ T1] ? do_one_initcall (init/main.c:1382) [ 0.365732][ T1] ? __register_sysctl_table (include/linux/spinlock.h:389 fs/proc/proc_sysctl.c:1403) [ 0.365732][ T1] ? __register_sysctl_init (fs/proc/proc_sysctl.c:1436 fs/proc/proc_sysctl.c:1465) [ 0.365732][ T1] ? init_mm_internals (mm/vmstat.c:2295) [ 0.365732][ T1] ? rest_init (init/main.c:760) [ 0.365732][ T1] ? kernel_init_freeable (init/main.c:1488 (discriminator 1) init/main.c:1681 (discriminator 1)) [ 0.365732][ T1] ? kernel_init (init/main.c:1582) [ 0.365732][ T1] ? ret_from_fork (arch/x86/kernel/process.c:158) [ 0.365732][ T1] ? rest_init (init/main.c:760) [ 0.365732][ T1] ? ret_from_fork_asm (arch/x86/entry/entry_32.S:736) [ 0.365732][ T1] ? entry_INT80_32 (arch/x86/entry/entry_32.S:940) [ 0.365732][ T1] Modules linked in: [ 0.365732][ T1] CR2: 0000000000000000 [ 0.365732][ T1] ---[ end trace 0000000000000000 ]--- [ 0.365732][ T1] EIP: strcmp (arch/x86/lib/string_32.c:97) [ 0.365732][ T1] Code: 84 c0 75 f7 31 c0 aa 89 d8 5b 5e 5f 5d 31 d2 31 c9 c3 8d 76 00 2e 8d b4 26 00 00 00 00 8d 74 26 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 31 d2 c3 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: 31 d2 xor %edx,%edx f: 31 c9 xor %ecx,%ecx 11: c3 ret 12: 8d 76 00 lea 0x0(%rsi),%esi 15: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi 1c: 00 1d: 8d 74 26 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: 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 The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260428/202604282018.c2caa8e7-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki