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X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR11MB4612 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: 731bdd97466a280d6bdd8eceeb13d9fab6f26cbd ("cgroup: avoid per-cpu allocation of size zero rstat cpu locks") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master [test failed on linux-next/master 176e917e010cb7dcc605f11d2bc33f304292482b] in testcase: boot config: x86_64-randconfig-123-20250522 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) +------------------------------------------------+------------+------------+ | | dc9f08bac2 | 731bdd9746 | +------------------------------------------------+------------+------------+ | BUG:kernel_NULL_pointer_dereference,address | 0 | 6 | | Oops | 0 | 6 | | RIP:lockdep_init_map_type | 0 | 6 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 6 | +------------------------------------------------+------------+------------+ 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/202505281034.7ae1668d-lkp@intel.com [ 3.888181][ T0] BUG: kernel NULL pointer dereference, address: 0000000000000028 [ 3.888838][ T0] #PF: supervisor write access in kernel mode [ 3.889345][ T0] #PF: error_code(0x0002) - not-present page [ 3.889345][ T0] PGD 0 P4D 0 [ 3.889345][ T0] Oops: Oops: 0002 [#1] KASAN PTI [ 3.889345][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.14.0-11173-g731bdd97466a #1 PREEMPT(undef) [ 3.889345][ T0] RIP: 0010:lockdep_init_map_type (kernel/locking/lockdep.c:4945) [ 3.889345][ T0] Code: 5b c3 cc cc cc cc cc 48 89 df e8 e2 6f d0 ff eb e5 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 56 53 50 <48> c7 47 10 00 00 00 00 48 c7 47 08 00 00 00 00 c7 47 24 00 00 00 All code ======== 0: 5b pop %rbx 1: c3 ret 2: cc int3 3: cc int3 4: cc int3 5: cc int3 6: cc int3 7: 48 89 df mov %rbx,%rdi a: e8 e2 6f d0 ff call 0xffffffffffd06ff1 f: eb e5 jmp 0xfffffffffffffff6 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 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: f3 0f 1e fa endbr64 25: 55 push %rbp 26: 41 56 push %r14 28: 53 push %rbx 29: 50 push %rax 2a:* 48 c7 47 10 00 00 00 movq $0x0,0x10(%rdi) <-- trapping instruction 31: 00 32: 48 c7 47 08 00 00 00 movq $0x0,0x8(%rdi) 39: 00 3a: c7 .byte 0xc7 3b: 47 24 00 rex.RXB and $0x0,%al ... Code starting with the faulting instruction =========================================== 0: 48 c7 47 10 00 00 00 movq $0x0,0x10(%rdi) 7: 00 8: 48 c7 47 08 00 00 00 movq $0x0,0x8(%rdi) f: 00 10: c7 .byte 0xc7 11: 47 24 00 rex.RXB and $0x0,%al ... [ 3.889345][ T0] RSP: 0000:ffffffff86207dc8 EFLAGS: 00010246 [ 3.889345][ T0] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000 [ 3.889345][ T0] RDX: ffffffff89125900 RSI: ffffffff84a8a080 RDI: 0000000000000018 [ 3.889345][ T0] RBP: 0000000000000002 R08: 0000000000000002 R09: 0000000000000000 [ 3.889345][ T0] R10: 0000000000000000 R11: ffffed1024080701 R12: dffffc0000000000 [ 3.889345][ T0] R13: dffffc0000000000 R14: ffffffff89125900 R15: ffffffff84a8a080 [ 3.889345][ T0] FS: 0000000000000000(0000) GS:0000000000000000(0000) knlGS:0000000000000000 [ 3.889345][ T0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3.889345][ T0] CR2: 0000000000000028 CR3: 000000000629a000 CR4: 00000000000406b0 [ 3.889345][ T0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 3.889345][ T0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 3.889345][ T0] Call Trace: [ 3.889345][ T0] [ 3.889345][ T0] __raw_spin_lock_init (include/linux/lockdep.h:135 include/linux/lockdep.h:142 kernel/locking/spinlock_debug.c:25) [ 3.889345][ T0] ss_rstat_init (kernel/cgroup/rstat.c:532) [ 3.889345][ T0] cgroup_init_subsys (kernel/cgroup/cgroup.c:6091) [ 3.889345][ T0] cgroup_init (kernel/cgroup/cgroup.c:?) [ 3.889345][ T0] start_kernel (init/main.c:1094) [ 3.889345][ T0] x86_64_start_reservations (??:?) [ 3.889345][ T0] x86_64_start_kernel (??:?) [ 3.889345][ T0] common_startup_64 (arch/x86/kernel/head_64.S:419) [ 3.889345][ T0] [ 3.889345][ T0] Modules linked in: [ 3.889345][ T0] CR2: 0000000000000028 [ 3.889345][ T0] ---[ end trace 0000000000000000 ]--- [ 3.889345][ T0] RIP: 0010:lockdep_init_map_type (kernel/locking/lockdep.c:4945) [ 3.889345][ T0] Code: 5b c3 cc cc cc cc cc 48 89 df e8 e2 6f d0 ff eb e5 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 56 53 50 <48> c7 47 10 00 00 00 00 48 c7 47 08 00 00 00 00 c7 47 24 00 00 00 All code ======== 0: 5b pop %rbx 1: c3 ret 2: cc int3 3: cc int3 4: cc int3 5: cc int3 6: cc int3 7: 48 89 df mov %rbx,%rdi a: e8 e2 6f d0 ff call 0xffffffffffd06ff1 f: eb e5 jmp 0xfffffffffffffff6 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 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: f3 0f 1e fa endbr64 25: 55 push %rbp 26: 41 56 push %r14 28: 53 push %rbx 29: 50 push %rax 2a:* 48 c7 47 10 00 00 00 movq $0x0,0x10(%rdi) <-- trapping instruction 31: 00 32: 48 c7 47 08 00 00 00 movq $0x0,0x8(%rdi) 39: 00 3a: c7 .byte 0xc7 3b: 47 24 00 rex.RXB and $0x0,%al ... Code starting with the faulting instruction =========================================== 0: 48 c7 47 10 00 00 00 movq $0x0,0x10(%rdi) 7: 00 8: 48 c7 47 08 00 00 00 movq $0x0,0x8(%rdi) f: 00 10: c7 .byte 0xc7 11: 47 24 00 rex.RXB and $0x0,%al The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250528/202505281034.7ae1668d-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki