Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

CPU: 1 PID: 1 Comm: init Not tainted 4.15.0-rc2-mm1+ #39
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+0x194/0x257 lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 find_child_reaper kernel/exit.c:578 [inline]
 forget_original_parent+0x1428/0x1c70 kernel/exit.c:674