==================================================================
BUG: KASAN: out-of-bounds in get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
BUG: KASAN: out-of-bounds in __unwind_start+0x37c/0x3c0 arch/x86/kernel/unwind_frame.c:76
Read of size 8 at addr ffff8801aedf7828 by task syz-executor5/31003

CPU: 0 PID: 31003 Comm: syz-executor5 Not tainted 4.9.123-g520d10d3 #81
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801ae667888 ffffffff81eb9689 ffffea0006bb7dc0 ffff8801aedf7828
 0000000000000000 ffff8801aedf7830 ffff8801ae6679c0 ffff8801ae6678c0
 ffffffff8156c3fe ffff8801aedf7828 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81eb9689>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb9689>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8156c3fe>] print_address_description+0x6c/0x234 mm/kasan/report.c:256
 [<ffffffff8156c808>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff8156c808>] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412
 [<ffffffff8153fb94>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 [<ffffffff810d42dc>] get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
 [<ffffffff810d42dc>] __unwind_start+0x37c/0x3c0 arch/x86/kernel/unwind_frame.c:76
 [<ffffffff8107b9a9>] unwind_start arch/x86/include/asm/unwind.h:39 [inline]
 [<ffffffff8107b9a9>] __save_stack_trace+0x59/0xf0 arch/x86/kernel/stacktrace.c:41
 [<ffffffff8107baa8>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816dc3d8>] proc_pid_stack+0x148/0x220 fs/proc/base.c:469
 [<ffffffff816ddacd>] proc_single_show+0xfd/0x170 fs/proc/base.c:771
 [<ffffffff815f1c56>] seq_read+0x4b6/0x12e0 fs/seq_file.c:240
 [<ffffffff81575725>] __vfs_read+0x115/0x570 fs/read_write.c:449
 [<ffffffff81576ef0>] vfs_read+0x120/0x380 fs/read_write.c:472
 [<ffffffff8157af49>] SYSC_read fs/read_write.c:588 [inline]
 [<ffffffff8157af49>] SyS_read+0xd9/0x1c0 fs/read_write.c:581
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff83a01d93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

The buggy address belongs to the page:
page:ffffea0006bb7dc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801aedf7700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801aedf7780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801aedf7800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                     ^
 ffff8801aedf7880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801aedf7900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================