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BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1360/0x17d0 arch/x86/kernel/unwind_orc.c:477
Read of size 8 at addr ffff88809422fa98 by task syz-executor149/6729

CPU: 0 PID: 6729 Comm: syz-executor149 Not tainted 4.14.195-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 unwind_next_frame+0x1360/0x17d0 arch/x86/kernel/unwind_orc.c:477
 perf_callchain_kernel+0x38c/0x520 arch/x86/events/core.c:2343
 get_perf_callchain+0x2df/0x740 kernel/events/callchain.c:217
 perf_callchain+0x147/0x190 kernel/events/callchain.c:190
 perf_prepare_sample+0xd77/0x1380 kernel/events/core.c:6162
 __perf_event_output kernel/events/core.c:6278 [inline]
 perf_event_output_forward+0xc9/0x1f0 kernel/events/core.c:6296
 __perf_event_overflow+0x113/0x310 kernel/events/core.c:7541
 perf_swevent_overflow kernel/events/core.c:7617 [inline]
 perf_swevent_event+0x299/0x460 kernel/events/core.c:7645
 perf_tp_event+0x540/0x6e0 kernel/events/core.c:8079
 perf_trace_run_bpf_submit+0x119/0x200 kernel/events/core.c:8049
 perf_trace_lock_acquire+0x332/0x510 include/trace/events/lock.h:13
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x2b8/0x3f0 kernel/locking/lockdep.c:3997
 __mutex_lock_common kernel/locking/mutex.c:756 [inline]
 __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
 futex_cleanup_begin kernel/futex.c:3833 [inline]
 futex_exit_release+0x26/0x220 kernel/futex.c:3885
 exit_mm_release+0x16/0x30 kernel/fork.c:1171
 exit_mm kernel/exit.c:500 [inline]
 do_exit+0x56f/0x27f0 kernel/exit.c:852
 do_group_exit+0x100/0x2e0 kernel/exit.c:962
 get_signal+0x38d/0x1ca0 kernel/signal.c:2423
 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:814
 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160
 prepare_exit_to_usermode+0x1af/0x210 arch/x86/entry/common.c:199
 retint_user+0x8/0x18
RIP: 0033:0x43f31f
RSP: 002b:00007ffe04b8f328 EFLAGS: 00010283
RAX: 00007ffe04b8f370 RBX: 00007ffe04b8f370 RCX: 0000000000000000
RDX: 00000000000000e0 RSI: 0000000000000000 RDI: 00007ffe04b8f370
RBP: 0000000000000000 R08: 00000000000000e0 R09: 00000000000000c2
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000001001
R13: 0000000000402420 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0002508bc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0xfffe0000000000()
raw: 00fffe0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809422f980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88809422fa00: f1 f1 f1 f1 00 00 00 f2 00 00 00 f2 f2 f2 00 00
>ffff88809422fa80: 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
                            ^
 ffff88809422fb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88809422fb80: 00 f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2 00 00 f3
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