IPVS: ftp: loaded support on port[0] = 21
F2FS-fs (loop0): Found nat_bits in checkpoint
==================================================================
BUG: KASAN: stack-out-of-bounds in deref_stack_regs arch/x86/kernel/unwind_orc.c:305 [inline]
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x142e/0x17d0 arch/x86/kernel/unwind_orc.c:437
Read of size 8 at addr ffff88808db5f5a8 by task syz-executor.1/9994

CPU: 1 PID: 9994 Comm: syz-executor.1 Not tainted 4.14.304-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 deref_stack_regs arch/x86/kernel/unwind_orc.c:305 [inline]
 unwind_next_frame+0x142e/0x17d0 arch/x86/kernel/unwind_orc.c:437
 perf_callchain_kernel+0x38c/0x520 arch/x86/events/core.c:2344
 get_perf_callchain+0x2de/0x740 kernel/events/callchain.c:217
 perf_callchain+0x147/0x190 kernel/events/callchain.c:190
 perf_prepare_sample+0x6a0/0x13a0 kernel/events/core.c:6171
 __perf_event_output kernel/events/core.c:6287 [inline]
 perf_event_output_forward+0xc9/0x1f0 kernel/events/core.c:6305
 __perf_event_overflow+0x113/0x310 kernel/events/core.c:7554
 perf_swevent_hrtimer+0x229/0x360 kernel/events/core.c:8762
 __run_hrtimer kernel/time/hrtimer.c:1223 [inline]
 __hrtimer_run_queues+0x2fe/0xc70 kernel/time/hrtimer.c:1287
 hrtimer_interrupt+0x1b9/0x470 kernel/time/hrtimer.c:1321
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline]
 smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1104
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:796
 </IRQ>
RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:774 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:796 [inline]
RIP: 0010:lock_acquire+0x97/0x3f0 kernel/locking/lockdep.c:3993
RSP: 0018:ffff88808db5f490 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff11e13d8 RBX: ffff888091f98180 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888091f98a04
RBP: ffffffff8904c0a0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffff888091f98180 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
 kernfs_activate+0x2a/0x180 fs/kernfs/dir.c:1242
 retint_kernel+0x2d/0x2d
RIP: 0000:0xffff888091f989d4
RSP: 8904c040:dffffc0000000000 EFLAGS: ffffffff874009d1 ORIG_RAX: ffffffff00000002
RAX: ffffffff872433c0 RBX: ffffffff81a3824a RCX: 0000000041b58ab3
RDX: ffffffff88b61714 RSI: ffffffff8141dec0 RDI: 0000000000000000
RBP: ffffffff8904c0a0 R08: ffffffff88b613d8 R09: 0000000041b58ab3
R10: 0000000000000282 R11: 0000000000000003 R12: ffffffff81a385fe
R13: ffffffff8904c0a0 R14: 1ffff11011b6bead R15: 1ffff11011b6beaa

The buggy address belongs to the page:
page:ffffea000236d7c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0xfff00000000000()
raw: 00fff00000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808db5f480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808db5f500: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00
>ffff88808db5f580: 00 f2 00 00 00 f2 f2 f2 00 00 00 00 00 f3 f3 f3
                                  ^
 ffff88808db5f600: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808db5f680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================