================================================================== BUG: KASAN: stack-out-of-bounds in profile_pc+0xa4/0xe0 arch/x86/kernel/time.c:42 Read of size 8 at addr ffff8881e633fbe0 by task syz-executor.0/1293 CPU: 1 PID: 1293 Comm: syz-executor.0 Not tainted 5.4.276-syzkaller-04920-g3ffe89ed1bf9 #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:atomic_try_cmpxchg include/asm-generic/atomic-instrumented.h:693 [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+0x8a/0x1b0 kernel/locking/spinlock.c:151 Code: 4a 89 04 23 bf 01 00 00 00 e8 d2 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 00 00 e8 29 dc 42 fd 4c 89 ff be 04 00 00 00 e8 RSP: 0018:ffff8881e633fbe0 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000004 RBX: 1ffff1103cc67f7c RCX: 00000000e633fc03 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff8881e633fc80 R08: ffffffff82093f15 R09: ffffed103d0669c6 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff8881dabbc188 R14: 1ffff1103cc67f80 R15: ffff8881e633fc00 spin_lock include/linux/spinlock.h:338 [inline] d_instantiate_new+0x68/0x110 fs/dcache.c:1975 ext4_add_nondir fs/ext4/namei.c:2719 [inline] ext4_symlink+0x906/0xef0 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: 0033:0x7f4ecdb4c427 Code: 73 01 c3 48 c7 c1 b0 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffefd0a8da8 EFLAGS: 00000202 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007ffefd0a8e70 RCX: 00007f4ecdb4c427 RDX: 00007f4ecdb98540 RSI: 00000000ffffff9c RDI: 00007ffefd0a8e70 RBP: 0000000000000001 R08: 0000000000000013 R09: 00007ffefd0a8af7 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea000798cfc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x8000000000000000() raw: 8000000000000000 0000000000000000 ffffea000798cfc8 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] __kmalloc+0x105/0x2e0 mm/slub.c:3909 kmalloc include/linux/slab.h:561 [inline] kernfs_fop_write+0x120/0x3e0 fs/kernfs/file.c:292 __vfs_write+0x103/0x750 fs/read_write.c:494 vfs_write+0x206/0x4e0 fs/read_write.c:558 ksys_write+0x199/0x2c0 fs/read_write.c:611 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 addr ffff8881e633fbe0 is located in stack of task syz-executor.0/1293 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: ffff8881e633fa80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881e633fb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881e633fb80: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 ^ ffff8881e633fc00: 04 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881e633fc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: 4a 89 04 23 mov %rax,(%rbx,%r12,1) 4: bf 01 00 00 00 mov $0x1,%edi 9: e8 d2 c9 f3 fc call 0xfcf3c9e0 e: 4d 89 fe mov %r15,%r14 11: 49 c1 ee 03 shr $0x3,%r14 15: 43 0f b6 04 26 movzbl (%r14,%r12,1),%eax 1a: 84 c0 test %al,%al 1c: 0f 85 bb 00 00 00 jne 0xdd 22: c7 44 24 20 00 00 00 movl $0x0,0x20(%rsp) 29: 00 * 2a: 4c 89 ef mov %r13,%rdi <-- trapping instruction 2d: be 04 00 00 00 mov $0x4,%esi 32: e8 29 dc 42 fd call 0xfd42dc60 37: 4c 89 ff mov %r15,%rdi 3a: be 04 00 00 00 mov $0x4,%esi 3f: e8 .byte 0xe8