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BUG: KASAN: stack-out-of-bounds in deref_stack_regs arch/x86/kernel/unwind_orc.c:349 [inline]
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x195c/0x1c60 arch/x86/kernel/unwind_orc.c:515
Read of size 8 at addr ffff888047aa7ec8 by task syz-executor.2/16146

CPU: 1 PID: 16146 Comm: syz-executor.2 Not tainted 4.19.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __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
 deref_stack_regs arch/x86/kernel/unwind_orc.c:349 [inline]
 unwind_next_frame+0x195c/0x1c60 arch/x86/kernel/unwind_orc.c:515
 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:6450
 perf_prepare_sample+0x81e/0x1620 kernel/events/core.c:6477
 __perf_event_output kernel/events/core.c:6592 [inline]
 perf_event_output_forward+0xf3/0x270 kernel/events/core.c:6610
 __perf_event_overflow+0x13c/0x370 kernel/events/core.c:7883
 perf_swevent_overflow kernel/events/core.c:7959 [inline]
 perf_swevent_event+0x347/0x550 kernel/events/core.c:7987
 perf_tp_event+0x29f/0xaa0 kernel/events/core.c:8415
 perf_trace_run_bpf_submit+0x144/0x220 kernel/events/core.c:8389
 perf_trace_sys_exit+0x2dc/0x460 include/trace/events/syscalls.h:44
 trace_sys_exit include/trace/events/syscalls.h:44 [inline]
 syscall_slow_exit_work+0x36c/0x630 arch/x86/entry/common.c:231
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x523/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x465d27
Code: 3c 1c 48 f7 d8 49 39 c4 72 b8 e8 a4 4d 02 00 85 c0 78 bd 48 83 c4 08 4c 89 e0 5b 41 5c c3 0f 1f 44 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe85b5d55f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 0000000020038000 RCX: 0000000000465d27
RDX: 00007fe85b5d5d30 RSI: 000000004008ae90 RDI: 0000000000000008
RBP: 0000000020039000 R08: 0000000000000000 R09: 00000000000000b3
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020039800
R13: 00007fe85b5d5d30 R14: 0000000000000009 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00011ea9c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfff00000000000()
raw: 00fff00000000000 0000000000000000 ffffffff011e0101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888047aa7d80: 04 f2 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 00
 ffff888047aa7e00: 00 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00
>ffff888047aa7e80: 00 00 00 00 00 00 f3 f3 f3 f3 00 00 00 00 00 00
                                              ^
 ffff888047aa7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888047aa7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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