Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009

CPU: 0 PID: 1 Comm: init Not tainted 4.9.94-g8683408 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d9ac79d0 ffffffff81d9b509 ffffffff83a4a360 00000000ffffffff
 ffff8801d9ad8000 0000000000000000 ffff8801d9ad8010 ffff8801d9ac7a90
 ffffffff8141f845 0000000041b58ab3 ffffffff8419c168 ffffffff8141f686
Call Trace:
 [<ffffffff81d9b509>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d9b509>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8141f845>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff81420377>] find_child_reaper kernel/exit.c:552 [inline]
 [<ffffffff81420377>] forget_original_parent kernel/exit.c:641 [inline]
 [<ffffffff81420377>] exit_notify kernel/exit.c:677 [inline]
 [<ffffffff81420377>] do_exit.cold.24+0x17b/0x2b2 kernel/exit.c:859
 [<ffffffff81144d91>] do_group_exit+0x111/0x340 kernel/exit.c:941
 [<ffffffff81167b5f>] get_signal+0x4cf/0x1450 kernel/signal.c:2317
 [<ffffffff810524d7>] do_signal+0x87/0x19f0 arch/x86/kernel/signal.c:807
 [<ffffffff81005581>] exit_to_usermode_loop+0xe1/0x120 arch/x86/entry/common.c:157
 [<ffffffff810064d4>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff810064d4>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff810064d4>] do_syscall_64+0x364/0x490 arch/x86/entry/common.c:287
 [<ffffffff838d1313>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..