================================================================== BUG: KASAN: stack-out-of-bounds in profile_pc+0xa4/0xe0 arch/x86/kernel/time.c:42 Read of size 8 at addr ffff8881bf94f800 by task syz.2.2794/8050 CPU: 0 PID: 8050 Comm: syz.2.2794 Tainted: G W 5.4.276-syzkaller-00020-g4275fce9fe94 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x600 mm/kasan/report.c:384 __kasan_report+0xf3/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 profile_pc+0xa4/0xe0 arch/x86/kernel/time.c:42 profile_tick+0xb9/0x100 kernel/profile.c:416 tick_sched_handle kernel/time/tick-sched.c:206 [inline] tick_sched_timer+0x237/0x3c0 kernel/time/tick-sched.c:1342 __run_hrtimer kernel/time/hrtimer.c:1581 [inline] __hrtimer_run_queues+0x3e9/0xb90 kernel/time/hrtimer.c:1643 hrtimer_interrupt+0x38a/0x890 kernel/time/hrtimer.c:1705 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1122 [inline] smp_apic_timer_interrupt+0x110/0x460 arch/x86/kernel/apic/apic.c:1147 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:200 [inline] RIP: 0010:atomic_try_cmpxchg include/asm-generic/atomic-instrumented.h:695 [inline] RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:78 [inline] RIP: 0010:do_raw_spin_lock include/linux/spinlock.h:181 [inline] RIP: 0010:__raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] RIP: 0010:_raw_spin_lock+0xc0/0x1b0 kernel/locking/spinlock.c:151 Code: fd 4c 89 ff be 04 00 00 00 e8 2c dc 42 fd 43 0f b6 04 26 84 c0 0f 85 aa 00 00 00 8b 44 24 20 b9 01 00 00 00 f0 41 0f b1 4d 00 <75> 33 48 c7 04 24 0e 36 e0 45 49 c7 04 1c 00 00 00 00 65 48 8b 04 RSP: 0018:ffff8881bf94f800 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 1ffff11037f29f00 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff8881bf94f820 RBP: ffff8881bf94f8a0 R08: dffffc0000000000 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff8881f1cdfd04 R14: 1ffff11037f29f04 R15: ffff8881bf94f820 spin_lock include/linux/spinlock.h:338 [inline] queue_lock kernel/futex.c:2345 [inline] futex_wait_setup+0x24a/0x6c0 kernel/futex.c:2795 futex_wait+0x2b8/0x890 kernel/futex.c:2844 do_futex+0x13c1/0x19f0 kernel/futex.c:3888 __do_sys_futex kernel/futex.c:3949 [inline] __se_sys_futex+0x355/0x470 kernel/futex.c:3917 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7fdddd566b99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdddc7e80f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fdddd6f4fa8 RCX: 00007fdddd566b99 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fdddd6f4fa8 RBP: 00007fdddd6f4fa0 R08: 00007fdddc7e86c0 R09: 00007fdddc7e86c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdddd6f4fac R13: 000000000000000b R14: 00007ffda1c14200 R15: 00007ffda1c142e8 The buggy address belongs to the page: page:ffffea0006fe53c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x8000000000000000() raw: 8000000000000000 ffffea0006fe53c8 ffffea0006fe53c8 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x500dc0(GFP_USER|__GFP_ZERO|__GFP_ACCOUNT) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x18f/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893 __alloc_pages include/linux/gfp.h:503 [inline] __alloc_pages_node include/linux/gfp.h:516 [inline] alloc_pages_node include/linux/gfp.h:530 [inline] alloc_thread_stack_node kernel/fork.c:259 [inline] dup_task_struct+0x85/0x600 kernel/fork.c:886 copy_process+0x56d/0x3230 kernel/fork.c:1889 _do_fork+0x197/0x900 kernel/fork.c:2399 __do_sys_clone3 kernel/fork.c:2688 [inline] __se_sys_clone3 kernel/fork.c:2675 [inline] __x64_sys_clone3+0x2da/0x300 kernel/fork.c:2675 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 page_owner free stack trace missing addr ffff8881bf94f800 is located in stack of task syz.2.2794/8050 at offset 0 in frame: _raw_spin_lock+0x0/0x1b0 this frame has 1 object: [32, 36) 'val.i.i.i' Memory state around the buggy address: ffff8881bf94f700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881bf94f780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881bf94f800: f1 f1 f1 f1 04 f3 f3 f3 00 00 00 00 00 00 00 00 ^ ffff8881bf94f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881bf94f900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: fd std 1: 4c 89 ff mov %r15,%rdi 4: be 04 00 00 00 mov $0x4,%esi 9: e8 2c dc 42 fd call 0xfd42dc3a e: 43 0f b6 04 26 movzbl (%r14,%r12,1),%eax 13: 84 c0 test %al,%al 15: 0f 85 aa 00 00 00 jne 0xc5 1b: 8b 44 24 20 mov 0x20(%rsp),%eax 1f: b9 01 00 00 00 mov $0x1,%ecx 24: f0 41 0f b1 4d 00 lock cmpxchg %ecx,0x0(%r13) * 2a: 75 33 jne 0x5f <-- trapping instruction 2c: 48 c7 04 24 0e 36 e0 movq $0x45e0360e,(%rsp) 33: 45 34: 49 c7 04 1c 00 00 00 movq $0x0,(%r12,%rbx,1) 3b: 00 3c: 65 gs 3d: 48 rex.W 3e: 8b .byte 0x8b 3f: 04 .byte 0x4