==================================================================
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 ffff8801c6ab7828 by task syz-executor2/9573

CPU: 0 PID: 9573 Comm: syz-executor2 Not tainted 4.9.124-g09eb2ba #83
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c9acfb00 ffffffff81eb95e9 ffffea00071aadc0 ffff8801c6ab7828
 0000000000000000 ffff8801c6ab7830 ffff8801c9acfc38 ffff8801c9acfb38
 ffffffff8156c35e ffff8801c6ab7828 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81eb95e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb95e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8156c35e>] print_address_description+0x6c/0x234 mm/kasan/report.c:256
 [<ffffffff8156c768>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff8156c768>] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412
 [<ffffffff8153faf4>] __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
 [<ffffffff816dc338>] proc_pid_stack+0x148/0x220 fs/proc/base.c:469
 [<ffffffff816dda2d>] proc_single_show+0xfd/0x170 fs/proc/base.c:771
 [<ffffffff815eeb13>] traverse+0x363/0x920 fs/seq_file.c:124
 [<ffffffff815ef210>] seq_lseek+0x140/0x3c0 fs/seq_file.c:337
 [<ffffffff8157661d>] vfs_llseek fs/read_write.c:298 [inline]
 [<ffffffff8157661d>] SYSC_lseek fs/read_write.c:311 [inline]
 [<ffffffff8157661d>] SyS_lseek+0xed/0x170 fs/read_write.c:302
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff83a019d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

The buggy address belongs to the page:
page:ffffea00071aadc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c6ab7700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c6ab7780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c6ab7800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                     ^
 ffff8801c6ab7880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c6ab7900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
input:  as /devices/virtual/input/input15
input:  as /devices/virtual/input/input16