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BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x169f/0x1810 arch/x86/kernel/unwind_orc.c:470
Read of size 8 at addr ffff8881ce51f860 by task syz-executor215/2442

CPU: 0 PID: 2442 Comm: syz-executor215 Not tainted 4.14.143+ #0
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xca/0x134 lib/dump_stack.c:53
 print_address_description+0x60/0x226 mm/kasan/report.c:187
 __kasan_report.cold+0x1a/0x41 mm/kasan/report.c:316
 unwind_next_frame+0x169f/0x1810 arch/x86/kernel/unwind_orc.c:470
 perf_callchain_kernel+0x3a0/0x540 arch/x86/events/core.c:2338
 get_perf_callchain+0x2f5/0x770 kernel/events/callchain.c:217
 perf_callchain+0x147/0x190 kernel/events/callchain.c:190
 perf_prepare_sample+0x6a8/0x1360 kernel/events/core.c:6148
 __perf_event_output kernel/events/core.c:6264 [inline]
 perf_event_output_forward+0xdc/0x220 kernel/events/core.c:6282
 __perf_event_overflow+0x12d/0x340 kernel/events/core.c:7520
 perf_swevent_overflow+0x7a/0xf0 kernel/events/core.c:7596
 perf_swevent_event+0x19c/0x270 kernel/events/core.c:7629
 perf_tp_event+0x633/0x7f0 kernel/events/core.c:8058
 perf_trace_run_bpf_submit kernel/events/core.c:8028 [inline]
 perf_trace_run_bpf_submit+0x113/0x170 kernel/events/core.c:8014
 perf_trace_lock_acquire+0x341/0x4e0 include/trace/events/lock.h:13
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x279/0x360 kernel/locking/lockdep.c:3990
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
 spin_lock include/linux/spinlock.h:317 [inline]
 queue_lock kernel/futex.c:2238 [inline]
 futex_wait_setup+0x132/0x330 kernel/futex.c:2677
 futex_wait+0x1ad/0x570 kernel/futex.c:2735
 do_futex+0x13f/0x1980 kernel/futex.c:3663
 SYSC_futex kernel/futex.c:3723 [inline]
 SyS_futex+0x1c5/0x2c3 kernel/futex.c:3691
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4467e9
RSP: 002b:00007f796f28adb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 00000000004467e9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc28
RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c
R13: 00007fffbd056c5f R14: 00007f796f28b9c0 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00073947c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000000()
raw: 4000000000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 ffffea00073947e0 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881ce51f700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881ce51f780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881ce51f800: 00 00 00 f1 f1 f1 f1 f1 f1 04 f2 00 f3 f3 f3 00
                                                       ^
 ffff8881ce51f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881ce51f900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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