r0 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000180), 0x0, 0x0)
r1 = ioctl$LOOP_CTL_GET_FREE(0xffffffffffffffff, 0x4c82)
ioctl$LOOP_CTL_REMOVE(r0, 0x4c81, r1)