=============================
WARNING: suspicious RCU usage
4.13.0-mm1+ #7 Not tainted
-----------------------------
./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
no locks held by syzkaller152010/4286.

stack backtrace:
CPU: 0 PID: 4286 Comm: syzkaller152010 Not tainted 4.13.0-mm1+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4673
 kvm_get_bus include/linux/kvm_host.h:479 [inline]
 kvm_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:678 [inline]
 kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3152 [inline]
 kvm_dev_ioctl+0x877/0x1840 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3203