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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 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: 16e7d1ea820782b8335c2a52052e4a0d9ca0d4b0 ("slab: add sheaves to most caches") https://git.kernel.org/cgit/linux/kernel/git/vbabka/linux.git b4/sheaves-for-all in testcase: boot config: x86_64-randconfig-004-20251015 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/202510161341.61ccb50f-lkp@intel.com [ 9.175176][ T0] BUG: kernel NULL pointer dereference, address: 0000000000000030 [ 9.175820][ T0] #PF: supervisor read access in kernel mode [ 9.176255][ T0] #PF: error_code(0x0000) - not-present page [ 9.176689][ T0] PGD 0 P4D 0 [ 9.176951][ T0] Oops: Oops: 0000 [#1] KASAN [ 9.177296][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Tainted: G T 6.18.0-rc1-00007-g16e7d1ea8207 #1 PREEMPT(undef) [ 9.178200][ T0] Tainted: [T]=RANDSTRUCT [ 9.178512][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 9.179274][ T0] RIP: 0010:__kmalloc_noprof (mm/slub.c:5635) [ 9.179696][ T0] Code: 75 0d 8b 55 d0 48 89 df 31 f6 e8 db 01 73 02 45 89 fc 4c 8b 7d c8 4c 89 ef 48 89 de 4c 89 fa 44 89 e1 e8 d3 b4 05 00 48 89 c3 <45> 8b 45 30 0f 1f 44 00 00 e8 42 c1 bd ff 84 c0 75 0d f6 05 ae f9 All code ======== 0: 75 0d jne 0xf 2: 8b 55 d0 mov -0x30(%rbp),%edx 5: 48 89 df mov %rbx,%rdi 8: 31 f6 xor %esi,%esi a: e8 db 01 73 02 call 0x27301ea f: 45 89 fc mov %r15d,%r12d 12: 4c 8b 7d c8 mov -0x38(%rbp),%r15 16: 4c 89 ef mov %r13,%rdi 19: 48 89 de mov %rbx,%rsi 1c: 4c 89 fa mov %r15,%rdx 1f: 44 89 e1 mov %r12d,%ecx 22: e8 d3 b4 05 00 call 0x5b4fa 27: 48 89 c3 mov %rax,%rbx 2a:* 45 8b 45 30 mov 0x30(%r13),%r8d <-- trapping instruction 2e: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 33: e8 42 c1 bd ff call 0xffffffffffbdc17a 38: 84 c0 test %al,%al 3a: 75 0d jne 0x49 3c: f6 .byte 0xf6 3d: 05 .byte 0x5 3e: ae scas %es:(%rdi),%al 3f: f9 stc Code starting with the faulting instruction =========================================== 0: 45 8b 45 30 mov 0x30(%r13),%r8d 4: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 9: e8 42 c1 bd ff call 0xffffffffffbdc150 e: 84 c0 test %al,%al 10: 75 0d jne 0x1f 12: f6 .byte 0xf6 13: 05 .byte 0x5 14: ae scas %es:(%rdi),%al 15: f9 stc [ 9.181316][ T0] RSP: 0000:ffffffff84e07dd0 EFLAGS: 00010046 [ 9.181986][ T0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 9.182866][ T0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 9.183766][ T0] RBP: ffffffff84e07e10 R08: 0000000000000000 R09: 0000000000000000 [ 9.184642][ T0] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000dc0 [ 9.185509][ T0] R13: 0000000000000000 R14: 000000000000000c R15: 00000000000003e0 [ 9.186381][ T0] FS: 0000000000000000(0000) GS:0000000000000000(0000) knlGS:0000000000000000 [ 9.187359][ T0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 9.188105][ T0] CR2: 0000000000000030 CR3: 0000000004ed7000 CR4: 00000000000000b0 [ 9.188989][ T0] Call Trace: [ 9.189338][ T0] [ 9.189655][ T0] ? do_kmem_cache_create (mm/slub.c:2602 mm/slub.c:7637 mm/slub.c:8609) [ 9.190269][ T0] do_kmem_cache_create (mm/slub.c:2602 mm/slub.c:7637 mm/slub.c:8609) [ 9.190856][ T0] create_boot_cache (mm/slab_common.c:679) [ 9.191415][ T0] kmem_cache_init (mm/slub.c:?) [ 9.191935][ T0] mm_core_init (mm/mm_init.c:2716) [ 9.192406][ T0] start_kernel (init/main.c:972) [ 9.192926][ T0] x86_64_start_reservations (??:?) [ 9.193487][ T0] x86_64_start_kernel (arch/x86/kernel/head64.c:234 (discriminator 2)) [ 9.194033][ T0] common_startup_64 (arch/x86/kernel/head_64.S:419) [ 9.194613][ T0] [ 9.194924][ T0] Modules linked in: [ 9.195327][ T0] CR2: 0000000000000030 [ 9.195775][ T0] ---[ end trace 0000000000000000 ]--- [ 9.196363][ T0] RIP: 0010:__kmalloc_noprof (mm/slub.c:5635) [ 9.197005][ T0] Code: 75 0d 8b 55 d0 48 89 df 31 f6 e8 db 01 73 02 45 89 fc 4c 8b 7d c8 4c 89 ef 48 89 de 4c 89 fa 44 89 e1 e8 d3 b4 05 00 48 89 c3 <45> 8b 45 30 0f 1f 44 00 00 e8 42 c1 bd ff 84 c0 75 0d f6 05 ae f9 All code ======== 0: 75 0d jne 0xf 2: 8b 55 d0 mov -0x30(%rbp),%edx 5: 48 89 df mov %rbx,%rdi 8: 31 f6 xor %esi,%esi a: e8 db 01 73 02 call 0x27301ea f: 45 89 fc mov %r15d,%r12d 12: 4c 8b 7d c8 mov -0x38(%rbp),%r15 16: 4c 89 ef mov %r13,%rdi 19: 48 89 de mov %rbx,%rsi 1c: 4c 89 fa mov %r15,%rdx 1f: 44 89 e1 mov %r12d,%ecx 22: e8 d3 b4 05 00 call 0x5b4fa 27: 48 89 c3 mov %rax,%rbx 2a:* 45 8b 45 30 mov 0x30(%r13),%r8d <-- trapping instruction 2e: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 33: e8 42 c1 bd ff call 0xffffffffffbdc17a 38: 84 c0 test %al,%al 3a: 75 0d jne 0x49 3c: f6 .byte 0xf6 3d: 05 .byte 0x5 3e: ae scas %es:(%rdi),%al 3f: f9 stc Code starting with the faulting instruction =========================================== 0: 45 8b 45 30 mov 0x30(%r13),%r8d 4: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 9: e8 42 c1 bd ff call 0xffffffffffbdc150 e: 84 c0 test %al,%al 10: 75 0d jne 0x1f 12: f6 .byte 0xf6 13: 05 .byte 0x5 14: ae scas %es:(%rdi),%al 15: f9 stc The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251016/202510161341.61ccb50f-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki