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2026 08:48:08 +0000 Date: Thu, 9 Jul 2026 16:48:00 +0800 From: kernel test robot To: Harry Yoo CC: , , Danielle Constantino , Shakeel Butt , , Subject: [harry:kmalloc-no-objext-rfc-v1r1] [mm/slab] 6bc21472e7: BUG:kernel_NULL_pointer_dereference,address Message-ID: <202607091002.cdfe5a08-lkp@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline User-Agent: s-nail v14.9.25 X-ClientProxiedBy: JH0PR01CA0070.apcprd01.prod.exchangelabs.com (2603:1096:990:57::14) To PH0PR11MB5832.namprd11.prod.outlook.com (2603:10b6:510:141::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH0PR11MB5832:EE_|DM4PR11MB6383:EE_ X-MS-Office365-Filtering-Correlation-Id: a282a028-c8df-4a49-533e-08dedd96cc8c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016|23010399003|3023799007|18002099003|11063799006|56012099006; X-Microsoft-Antispam-Message-Info: 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 PZNkq/2e 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: 6bc21472e7eb9f8c771ffdf86266aa6d9dcb1dac ("mm/slab: prevent unbounded recursion due to obj_exts in free path") https://git.kernel.org/cgit/linux/kernel/git/harry/linux.git kmalloc-no-objext-rfc-v1r1 in testcase: boot config: i386-randconfig-2006-20250804 compiler: gcc-14 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G (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/202607091002.cdfe5a08-lkp@intel.com [ 0.183091][ T0] BUG: kernel NULL pointer dereference, address: 0000000c [ 0.183772][ T0] #PF: supervisor read access in kernel mode [ 0.184312][ T0] #PF: error_code(0x0000) - not-present page [ 0.184851][ T0] *pde = 00000000 [ 0.185186][ T0] Oops: Oops: 0000 [#1] [ 0.185561][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 7.2.0-rc1+ #1 PREEMPT 27a7cd77b6ab41253c0455bf8bac7f75db905e14 [ 0.186647][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 0.187601][ T0] EIP: __kmalloc_flags_noprof (slub.c:5311 slub.c:5506) [ 0.188122][ T0] Code: 7d d7 00 74 0a 84 d2 74 06 31 c0 89 df f3 aa ff 75 e8 89 da 89 f0 8b 4d dc e8 47 28 00 00 59 8b 45 e0 89 da ff 75 0c ff 75 dc 76 0c 8b 4d d8 e8 00 da ff ff 83 c4 0c eb 16 8d 45 e0 50 ff 75 All code ======== 0: 7d d7 jge 0xffffffffffffffd9 2: 00 74 0a 84 add %dh,-0x7c(%rdx,%rcx,1) 6: d2 74 06 31 shlb %cl,0x31(%rsi,%rax,1) a: c0 89 df f3 aa ff 75 rorb $0x75,-0x550c21(%rcx) 11: e8 89 da 89 f0 call 0xfffffffff089da9f 16: 8b 4d dc mov -0x24(%rbp),%ecx 19: e8 47 28 00 00 call 0x2865 1e: 59 pop %rcx 1f: 8b 45 e0 mov -0x20(%rbp),%eax 22: 89 da mov %ebx,%edx 24: ff 75 0c push 0xc(%rbp) 27: ff 75 dc push -0x24(%rbp) 2a:* ff 76 0c push 0xc(%rsi) <-- trapping instruction 2d: 8b 4d d8 mov -0x28(%rbp),%ecx 30: e8 00 da ff ff call 0xffffffffffffda35 35: 83 c4 0c add $0xc,%esp 38: eb 16 jmp 0x50 3a: 8d 45 e0 lea -0x20(%rbp),%eax 3d: 50 push %rax 3e: ff .byte 0xff 3f: 75 .byte 0x75 Code starting with the faulting instruction =========================================== 0: ff 76 0c push 0xc(%rsi) 3: 8b 4d d8 mov -0x28(%rbp),%ecx 6: e8 00 da ff ff call 0xffffffffffffda0b b: 83 c4 0c add $0xc,%esp e: eb 16 jmp 0x26 10: 8d 45 e0 lea -0x20(%rbp),%eax 13: 50 push %rax 14: ff .byte 0xff 15: 75 .byte 0x75 [ 0.189928][ T0] EAX: b11c8b96 EBX: 00000000 ECX: b18bdac5 EDX: 00000000 [ 0.190574][ T0] ESI: 00000000 EDI: 00000150 EBP: b1e17df0 ESP: b1e17db8 [ 0.191220][ T0] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00210046 [ 0.191925][ T0] CR0: 80050033 CR2: 0000000c CR3: 0253b000 CR4: 00000090 [ 0.192579][ T0] Call Trace: [ 0.192877][ T0] ? alloc_from_new_slab (linux/spinlock.h:408 slub.c:4416) [ 0.193350][ T0] ? alloc_slab_obj_exts (slab.h:39 slub.c:2149) [ 0.193823][ T0] alloc_slab_obj_exts (slab.h:39 slub.c:2149) [ 0.194280][ T0] __alloc_tagging_slab_alloc_hook (slub.c:2329 slub.c:2358) [ 0.194833][ T0] alloc_tagging_slab_alloc_hook (slub.c:2381) [ 0.195372][ T0] __kmalloc_cache_node_noprof (slub.c:4596 slub.c:4893 slub.c:5482) [ 0.195903][ T0] ? init_kmem_cache_nodes (linux/slab.h:1192 slub.c:7732) [ 0.196400][ T0] init_kmem_cache_nodes (linux/slab.h:1192 slub.c:7732) [ 0.196882][ T0] do_kmem_cache_create (slub.c:8646) [ 0.197354][ T0] create_boot_cache (slab_common.c:717) [ 0.197788][ T0] new_kmalloc_cache (slab_common.c:735 slab_common.c:996) [ 0.198237][ T0] create_kmalloc_caches (slab_common.c:1019) [ 0.198701][ T0] kmem_cache_init (slub.c:8555) [ 0.199125][ T0] mm_core_init (mm_init.c:2728) [ 0.199533][ T0] start_kernel (main.c:1034) [ 0.199939][ T0] i386_start_kernel (x86/kernel/head32.c:79) [ 0.200368][ T0] startup_32_smp (x86/kernel/head_32.S:292) [ 0.200791][ T0] Modules linked in: [ 0.201141][ T0] CR2: 000000000000000c [ 0.201513][ T0] ---[ end trace 0000000000000000 ]--- [ 0.202004][ T0] EIP: __kmalloc_flags_noprof (slub.c:5311 slub.c:5506) [ 0.202522][ T0] Code: 7d d7 00 74 0a 84 d2 74 06 31 c0 89 df f3 aa ff 75 e8 89 da 89 f0 8b 4d dc e8 47 28 00 00 59 8b 45 e0 89 da ff 75 0c ff 75 dc 76 0c 8b 4d d8 e8 00 da ff ff 83 c4 0c eb 16 8d 45 e0 50 ff 75 All code ======== 0: 7d d7 jge 0xffffffffffffffd9 2: 00 74 0a 84 add %dh,-0x7c(%rdx,%rcx,1) 6: d2 74 06 31 shlb %cl,0x31(%rsi,%rax,1) a: c0 89 df f3 aa ff 75 rorb $0x75,-0x550c21(%rcx) 11: e8 89 da 89 f0 call 0xfffffffff089da9f 16: 8b 4d dc mov -0x24(%rbp),%ecx 19: e8 47 28 00 00 call 0x2865 1e: 59 pop %rcx 1f: 8b 45 e0 mov -0x20(%rbp),%eax 22: 89 da mov %ebx,%edx 24: ff 75 0c push 0xc(%rbp) 27: ff 75 dc push -0x24(%rbp) 2a:* ff 76 0c push 0xc(%rsi) <-- trapping instruction 2d: 8b 4d d8 mov -0x28(%rbp),%ecx 30: e8 00 da ff ff call 0xffffffffffffda35 35: 83 c4 0c add $0xc,%esp 38: eb 16 jmp 0x50 3a: 8d 45 e0 lea -0x20(%rbp),%eax 3d: 50 push %rax 3e: ff .byte 0xff 3f: 75 .byte 0x75 Code starting with the faulting instruction =========================================== 0: ff 76 0c push 0xc(%rsi) 3: 8b 4d d8 mov -0x28(%rbp),%ecx 6: e8 00 da ff ff call 0xffffffffffffda0b b: 83 c4 0c add $0xc,%esp e: eb 16 jmp 0x26 10: 8d 45 e0 lea -0x20(%rbp),%eax 13: 50 push %rax 14: ff .byte 0xff 15: 75 .byte 0x75 The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260709/202607091002.cdfe5a08-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki