==================================================================
BUG: KASAN: stack-out-of-bounds in user_mode arch/x86/include/asm/ptrace.h:131 [inline]
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x10a0/0x1400 arch/x86/kernel/unwind_orc.c:410
Read of size 8 at addr ffff8880b451f4f0 by task syz-executor.0/14315

CPU: 0 PID: 14315 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 user_mode arch/x86/include/asm/ptrace.h:131 [inline]
 unwind_next_frame+0x10a0/0x1400 arch/x86/kernel/unwind_orc.c:410
 perf_callchain_kernel+0x3fa/0x5c0 arch/x86/events/core.c:2346
 get_perf_callchain+0x392/0x860 kernel/events/callchain.c:202
 perf_callchain+0x165/0x1c0 kernel/events/core.c:6474
 perf_prepare_sample+0x81e/0x1620 kernel/events/core.c:6501
 __perf_event_output kernel/events/core.c:6616 [inline]
 perf_event_output_forward+0xf3/0x270 kernel/events/core.c:6634
 __perf_event_overflow+0x13c/0x370 kernel/events/core.c:7907
 perf_swevent_hrtimer+0x272/0x3e0 kernel/events/core.c:9261
 __run_hrtimer kernel/time/hrtimer.c:1465 [inline]
 __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1527
 hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:784 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:806 [inline]
RIP: 0010:lock_acquire+0x97/0x3c0 kernel/locking/lockdep.c:3903
Code: 82 f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 eb 02 00 00 48 83 3d 50 2f a6 08 00 0f 84 75 02 00 00 9c <58> 0f 1f 44 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 44 24 08 48
RSP: 0018:ffff8880b451f3e0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13e3050 RBX: ffff88804c02e380 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff88804c02ec04
RBP: ffffffff8d249940 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
 audit_ctl_lock kernel/audit.c:244 [inline]
 audit_receive+0x81/0x230 kernel/audit.c:1523
 retint_kernel+0x2d/0x2d
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:lock_acquire+0x1ec/0x3c0 kernel/locking/lockdep.c:3911
Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 b7 01 00 00 48 83 3d 09 2e a6 08 00 0f 84 2a 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b
RSP: 168a3ea9:ffffffff89f85fa0 EFLAGS: ffffffff8d243760 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13e3051 RBX: 0000000041b58ab3 RCX: 6ef1e41ac93df87f
RDX: dffffc0000000000 RSI: 000000009004fc4c RDI: 0000000000000286
RBP: ffffffff816026d1 R08: 00000000594ea6fa R09: 0000000000000000
R10: ffffffff88188780 R11: ffffffff89b72700 R12: ffffffff8d249940
R13: 0000000000000000 R14: 0000000000000002 R15: 1ffff110168a3e92

The buggy address belongs to the page:
page:ffffea0002d147c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfff00000000000()
raw: 00fff00000000000 0000000000000000 ffffffff02d10101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880b451f380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880b451f400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880b451f480: 00 00 f1 f1 f1 f1 00 00 00 f2 00 00 00 f2 f2 f2
                                                             ^
 ffff8880b451f500: 00 00 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00
 ffff8880b451f580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
   7:	fc ff df
   a:	48 c1 e8 03          	shr    $0x3,%rax
   e:	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1)
  12:	0f 85 eb 02 00 00    	jne    0x303
  18:	48 83 3d 50 2f a6 08 	cmpq   $0x0,0x8a62f50(%rip)        # 0x8a62f70
  1f:	00
  20:	0f 84 75 02 00 00    	je     0x29b
  26:	9c                   	pushfq
* 27:	58                   	pop    %rax <-- trapping instruction
  28:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  2d:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  34:	fc ff df
  37:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  3c:	48                   	rex.W