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X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR11MB6258 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: db93cdd664fa02de9be883dd29343b21d8fc790f ("slab: Introduce kmalloc_nolock() and kfree_nolock().") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master in testcase: boot config: i386-randconfig-062-20250913 compiler: clang-20 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (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/202509171214.912d5ac-lkp@intel.com [ 7.101117][ T0] BUG: kernel NULL pointer dereference, address: 00000010 [ 7.102290][ T0] #PF: supervisor read access in kernel mode [ 7.103219][ T0] #PF: error_code(0x0000) - not-present page [ 7.104161][ T0] *pde = 00000000 [ 7.104762][ T0] Thread overran stack, or stack corrupted [ 7.105726][ T0] Oops: Oops: 0000 [#1] [ 7.106410][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Tainted: G T 6.17.0-rc3-00014-gdb93cdd664fa #1 NONE 40eff3b43e4f0000b061f2e660abd0b2911f31b1 [ 7.108712][ T0] Tainted: [T]=RANDSTRUCT [ 7.109368][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 7.110952][ T0] EIP: kmalloc_nolock_noprof (mm/slub.c:5607) [ 7.112838][ T0] Code: 90 90 90 90 90 89 45 bc 0f bd 75 bc 75 05 be ff ff ff ff 46 83 fe 0e 0f 83 b6 01 00 00 6b c7 38 8b 84 b0 b4 79 d0 b2 89 45 ec <8b> 40 10 a9 00 00 01 00 75 1b 8b 0d ec 28 db b3 31 f6 a9 87 04 00 All code ======== 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 89 45 bc mov %eax,-0x44(%rbp) 8: 0f bd 75 bc bsr -0x44(%rbp),%esi c: 75 05 jne 0x13 e: be ff ff ff ff mov $0xffffffff,%esi 13: 46 83 fe 0e rex.RX cmp $0xe,%esi 17: 0f 83 b6 01 00 00 jae 0x1d3 1d: 6b c7 38 imul $0x38,%edi,%eax 20: 8b 84 b0 b4 79 d0 b2 mov -0x4d2f864c(%rax,%rsi,4),%eax 27: 89 45 ec mov %eax,-0x14(%rbp) 2a:* 8b 40 10 mov 0x10(%rax),%eax <-- trapping instruction 2d: a9 00 00 01 00 test $0x10000,%eax 32: 75 1b jne 0x4f 34: 8b 0d ec 28 db b3 mov -0x4c24d714(%rip),%ecx # 0xffffffffb3db2926 3a: 31 f6 xor %esi,%esi 3c: a9 .byte 0xa9 3d: 87 04 00 xchg %eax,(%rax,%rax,1) Code starting with the faulting instruction =========================================== 0: 8b 40 10 mov 0x10(%rax),%eax 3: a9 00 00 01 00 test $0x10000,%eax 8: 75 1b jne 0x25 a: 8b 0d ec 28 db b3 mov -0x4c24d714(%rip),%ecx # 0xffffffffb3db28fc 10: 31 f6 xor %esi,%esi 12: a9 .byte 0xa9 13: 87 04 00 xchg %eax,(%rax,%rax,1) [ 7.115899][ T0] EAX: 00000000 EBX: 00000101 ECX: 00000200 EDX: 00000000 [ 7.116940][ T0] ESI: 00000009 EDI: 0000000e EBP: b2d07d18 ESP: b2d07cd4 [ 7.118013][ T0] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00210002 [ 7.119201][ T0] CR0: 80050033 CR2: 00000010 CR3: 03672000 CR4: 00000090 [ 7.120263][ T0] Call Trace: [ 7.120791][ T0] Modules linked in: [ 7.121455][ T0] CR2: 0000000000000010 [ 7.122145][ T0] ---[ end trace 0000000000000000 ]--- [ 7.123070][ T0] EIP: kmalloc_nolock_noprof (mm/slub.c:5607) [ 7.123973][ T0] Code: 90 90 90 90 90 89 45 bc 0f bd 75 bc 75 05 be ff ff ff ff 46 83 fe 0e 0f 83 b6 01 00 00 6b c7 38 8b 84 b0 b4 79 d0 b2 89 45 ec <8b> 40 10 a9 00 00 01 00 75 1b 8b 0d ec 28 db b3 31 f6 a9 87 04 00 All code ======== 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 89 45 bc mov %eax,-0x44(%rbp) 8: 0f bd 75 bc bsr -0x44(%rbp),%esi c: 75 05 jne 0x13 e: be ff ff ff ff mov $0xffffffff,%esi 13: 46 83 fe 0e rex.RX cmp $0xe,%esi 17: 0f 83 b6 01 00 00 jae 0x1d3 1d: 6b c7 38 imul $0x38,%edi,%eax 20: 8b 84 b0 b4 79 d0 b2 mov -0x4d2f864c(%rax,%rsi,4),%eax 27: 89 45 ec mov %eax,-0x14(%rbp) 2a:* 8b 40 10 mov 0x10(%rax),%eax <-- trapping instruction 2d: a9 00 00 01 00 test $0x10000,%eax 32: 75 1b jne 0x4f 34: 8b 0d ec 28 db b3 mov -0x4c24d714(%rip),%ecx # 0xffffffffb3db2926 3a: 31 f6 xor %esi,%esi 3c: a9 .byte 0xa9 3d: 87 04 00 xchg %eax,(%rax,%rax,1) Code starting with the faulting instruction =========================================== 0: 8b 40 10 mov 0x10(%rax),%eax 3: a9 00 00 01 00 test $0x10000,%eax 8: 75 1b jne 0x25 a: 8b 0d ec 28 db b3 mov -0x4c24d714(%rip),%ecx # 0xffffffffb3db28fc 10: 31 f6 xor %esi,%esi 12: a9 .byte 0xa9 13: 87 04 00 xchg %eax,(%rax,%rax,1) The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250917/202509171214.912d5ac-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki