================================================================== BUG: KASAN: stack-out-of-bounds in profile_pc+0xa4/0xe0 arch/x86/kernel/time.c:42 Read of size 8 at addr ffff8881ef16f660 by task syz-executor/3458 CPU: 0 PID: 3458 Comm: syz-executor 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:queued_spin_lock include/asm-generic/qspinlock.h:76 [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+0x7a/0x1b0 kernel/locking/spinlock.c:151 Code: 89 e3 48 c1 eb 03 48 b8 f1 f1 f1 f1 04 f3 f3 f3 4a 89 04 23 bf 01 00 00 00 e8 72 c9 f3 fc 4d 89 fe 49 c1 ee 03 43 0f b6 04 26 <84> c0 0f 85 bb 00 00 00 c7 44 24 20 00 00 00 00 4c 89 ef be 04 00 RSP: 0018:ffff8881ef16f660 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000004 RBX: 1ffff1103de2decc RCX: ffffffff84512a00 RDX: fdcdba41be8f162f RSI: 00000000000007f2 RDI: 0000000000000000 RBP: ffff8881ef16f6f0 R08: ffffffff81c7f364 R09: ffffffff81a1ad22 R10: ffff8881ee00ee40 R11: 0000000000000002 R12: dffffc0000000000 R13: ffffffff85e0c540 R14: 1ffff1103de2ded0 R15: ffff8881ef16f680 spin_lock include/linux/spinlock.h:338 [inline] find_inode_nowait+0x6f/0x170 fs/inode.c:1483 ext4_update_other_inodes_time fs/ext4/inode.c:5387 [inline] ext4_do_update_inode fs/ext4/inode.c:5514 [inline] ext4_mark_iloc_dirty+0x21a1/0x3560 fs/ext4/inode.c:6071 ext4_mark_inode_dirty+0x4e7/0x7a0 fs/ext4/inode.c:6273 add_dirent_to_buf+0x647/0x780 fs/ext4/namei.c:2163 ext4_add_entry+0x917/0x1240 fs/ext4/namei.c:2389 ext4_add_nondir fs/ext4/namei.c:2716 [inline] ext4_symlink+0x8b3/0xef0 fs/ext4/namei.c:3496 vfs_symlink+0x36c/0x500 fs/namei.c:4276 do_symlinkat+0x19b/0x400 fs/namei.c:4303 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f25d62341b7 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0a 01 00 00 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:00007ffc349edfb8 EFLAGS: 00000206 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f25d62341b7 RDX: 00007f25d62a3a5c RSI: 00000000ffffff9c RDI: 00007ffc349ee070 RBP: 0000000000000001 R08: 0000000000000013 R09: 00007ffc349edd07 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000032 R13: 0000000000001388 R14: 00007ffc349ee070 R15: 00007ffc349ee070 The buggy address belongs to the page: page:ffffea0007bc5bc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x8000000000000000() raw: 8000000000000000 0000000000000000 ffffea0007bc5bc8 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_clone kernel/fork.c:2557 [inline] __se_sys_clone kernel/fork.c:2538 [inline] __x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2538 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4955 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4961 __free_slab+0x221/0x2e0 mm/slub.c:1774 free_slab mm/slub.c:1789 [inline] discard_slab mm/slub.c:1795 [inline] unfreeze_partials+0x14e/0x180 mm/slub.c:2288 put_cpu_partial+0x44/0x180 mm/slub.c:2324 __slab_free+0x297/0x360 mm/slub.c:2971 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x1d9/0x210 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x41/0x210 mm/kasan/common.c:507 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842 getname_flags+0xb8/0x4e0 fs/namei.c:141 user_path_at_empty+0x28/0x50 fs/namei.c:2703 user_path_at include/linux/namei.h:49 [inline] vfs_statx+0x115/0x210 fs/stat.c:187 vfs_fstatat include/linux/fs.h:3380 [inline] __do_sys_newfstatat fs/stat.c:367 [inline] __se_sys_newfstatat+0xce/0x770 fs/stat.c:361 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 addr ffff8881ef16f660 is located in stack of task syz-executor/3458 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: ffff8881ef16f500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881ef16f580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881ef16f600: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 ^ ffff8881ef16f680: 04 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881ef16f700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: 89 e3 mov %esp,%ebx 2: 48 c1 eb 03 shr $0x3,%rbx 6: 48 b8 f1 f1 f1 f1 04 movabs $0xf3f3f304f1f1f1f1,%rax d: f3 f3 f3 10: 4a 89 04 23 mov %rax,(%rbx,%r12,1) 14: bf 01 00 00 00 mov $0x1,%edi 19: e8 72 c9 f3 fc call 0xfcf3c990 1e: 4d 89 fe mov %r15,%r14 21: 49 c1 ee 03 shr $0x3,%r14 25: 43 0f b6 04 26 movzbl (%r14,%r12,1),%eax * 2a: 84 c0 test %al,%al <-- trapping instruction 2c: 0f 85 bb 00 00 00 jne 0xed 32: c7 44 24 20 00 00 00 movl $0x0,0x20(%rsp) 39: 00 3a: 4c 89 ef mov %r13,%rdi 3d: be .byte 0xbe 3e: 04 00 add $0x0,%al