================================================================== BUG: KASAN: stack-out-of-bounds in profile_pc+0xa4/0xe0 arch/x86/kernel/time.c:42 Read of size 8 at addr ffff8881d84dfca0 by task udevd/411 CPU: 0 PID: 411 Comm: udevd Not tainted 5.4.254-syzkaller-04740-g65fc90b61bc7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 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 The buggy address belongs to the page: page:ffffea00076137c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x8000000000000000() raw: 8000000000000000 ffffea00076137c8 ffffea00076137c8 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:4891 __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:878 copy_process+0x56d/0x3230 kernel/fork.c:1881 _do_fork+0x197/0x900 kernel/fork.c:2391 __do_sys_clone kernel/fork.c:2549 [inline] __se_sys_clone kernel/fork.c:2530 [inline] __x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2530 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 ffff8881d84dfca0 is located in stack of task udevd/411 at offset 0 in frame: _raw_spin_lock+0x0/0x1b0 arch/x86/include/asm/atomic.h:200 this frame has 1 object: [32, 36) 'val.i.i.i' Memory state around the buggy address: ffff8881d84dfb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881d84dfc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881d84dfc80: 00 00 00 00 f1 f1 f1 f1 04 f3 f3 f3 00 00 00 00 ^ ffff8881d84dfd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881d84dfd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================