==================================================================
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+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76
Read of size 8 at addr ffff8801c69878b8 by task syz-executor0/3682

CPU: 1 PID: 3682 Comm: syz-executor0 Not tainted 4.9.77-ge12a9c4 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c6a1f900 ffffffff81d941c9 ffffea00071a61c0 ffff8801c69878b8
 0000000000000000 ffff8801c69878c0 ffff8801c6a1fa30 ffff8801c6a1f938
 ffffffff8153db93 ffff8801c69878b8 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d941c9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d941c9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153db93>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153e0b5>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153e0b5>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153e214>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff810d5397>] get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
 [<ffffffff810d5397>] __unwind_start+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76
 [<ffffffff8107c689>] unwind_start arch/x86/include/asm/unwind.h:39 [inline]
 [<ffffffff8107c689>] __save_stack_trace+0x59/0xf0 arch/x86/kernel/stacktrace.c:41
 [<ffffffff8107c788>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c4f46>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c6718>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e884f>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff8156b9e3>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156f77e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff8157386f>] SYSC_pread64 fs/read_write.c:629 [inline]
 [<ffffffff8157386f>] SyS_pread64+0x13f/0x170 fs/read_write.c:616
 [<ffffffff838b2c2e>] entry_SYSCALL_64_fastpath+0x29/0xe8

The buggy address belongs to the page:
page:ffffea00071a61c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c6987780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c6987800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c6987880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                           ^
 ffff8801c6987900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c6987980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3682 Comm: syz-executor0 Tainted: G    B           4.9.77-ge12a9c4 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c6a1f858 ffffffff81d941c9 ffffffff841970ff ffff8801c6a1f930
 0000000000000000 ffff8801c69878c0 ffff8801c6a1fa30 ffff8801c6a1f920
 ffffffff8142f3c1 0000000041b58ab3 ffffffff8418ab70 ffffffff8142f205
Call Trace:
 [<ffffffff81d941c9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d941c9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142f3c1>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff8153db00>] kasan_end_report+0x50/0x50 mm/kasan/report.c:176
 [<ffffffff8153dfa7>] kasan_report_error mm/kasan/report.c:356 [inline]
 [<ffffffff8153dfa7>] kasan_report+0x167/0x360 mm/kasan/report.c:408
 [<ffffffff8153e214>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff810d5397>] get_frame_pointer arch/x86/include/asm/stacktrace.h:64 [inline]
 [<ffffffff810d5397>] __unwind_start+0x3a7/0x3c0 arch/x86/kernel/unwind_frame.c:76
 [<ffffffff8107c689>] unwind_start arch/x86/include/asm/unwind.h:39 [inline]
 [<ffffffff8107c689>] __save_stack_trace+0x59/0xf0 arch/x86/kernel/stacktrace.c:41
 [<ffffffff8107c788>] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71
 [<ffffffff816c4f46>] proc_pid_stack+0x146/0x230 fs/proc/base.c:466
 [<ffffffff816c6718>] proc_single_show+0xf8/0x170 fs/proc/base.c:768
 [<ffffffff815e884f>] seq_read+0x32f/0x1290 fs/seq_file.c:240
 [<ffffffff8156b9e3>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156f77e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff8157386f>] SYSC_pread64 fs/read_write.c:629 [inline]
 [<ffffffff8157386f>] SyS_pread64+0x13f/0x170 fs/read_write.c:616
 [<ffffffff838b2c2e>] entry_SYSCALL_64_fastpath+0x29/0xe8
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..