### ImageMagick version

7.1.1-13

### Operating system

Linux

### Operating system, version and so on

ubuntu-20.04

### Description

After executing the/home/ljh/ImageMagick/build/bin/convert in/1.pdf in/1.png command for dozens of hours, the PDF file still cannot be converted to a png image. 

### Steps to Reproduce

My Compilation Process：
git clone https://github.com/ImageMagick/ImageMagick.git
cd ImageMagick
CFLAGS="-g -O0" CXXFLAGS="-g -O0" ./configure --prefix="$HOME/ImageMagick/build/"
sh configure
chmod u+x configure
./configure --prefix="$HOME/ImageMagick/build/"
make
sudo make install

reproduce: /home/ljh/ImageMagick/build/bin/convert in/1.pdf in/1.png

### Images

[1.pdf](https://github.com/ImageMagick/ImageMagick/files/12184063/1.pdf)

Unable to convert PDF file to PNG image.
This is a GitHub Issue
repo:ImageMagick
owner:ImageMagick
Title : Unable to convert PDF file to PNG image.
Issue date:

--- start body ---
### ImageMagick version

7.1.1-13

### Operating system

Linux

### Operating system, version and so on

ubuntu-20.04

### Description

After executing the/home/ljh/ImageMagick/build/bin/convert in/1.pdf in/1.png command for dozens of hours, the PDF file still cannot be converted to a png image. 

### Steps to Reproduce

My Compilation Process：
git clone https://github.com/ImageMagick/ImageMagick.git
cd ImageMagick
CFLAGS="-g -O0" CXXFLAGS="-g -O0" ./configure --prefix="$HOME/ImageMagick/build/"
sh configure
chmod u+x configure
./configure --prefix="$HOME/ImageMagick/build/"
make
sudo make install

reproduce: /home/ljh/ImageMagick/build/bin/convert in/1.pdf in/1.png

### Images

[1.pdf](https://github.com/ImageMagick/ImageMagick/files/12184063/1.pdf)

--- end body ---

None