Function media_handle_sideload doesn't return with some pdf files due to Imagick

[alceomazza]

I'm trying to upload procedurally some media with media_handle_sideload, but some pdf files cause the execution flow to froze without media_handle_sideload returning a value nor launching an Exception.
This happens when the Imagick module is installed.

Environment

• OS: CentOS 7
• PHP Version: 7.4.28
• WordPress Version: 5.9.2
• Imagick Version: 6.9.10-68

Debug snippet

The bug can be verified calling the function alceo_handle_media_debug

<?php

function alceo_handle_media_debug() {
    alceo_handle_media( 'https://life365.s3.eu-central-1.amazonaws.com/IT/p/11822/file/FilamentClear_2018.pdf' );
}

function alceo_handle_media( $url ) {
    $path_info = pathinfo( parse_url( $url )['path'] );
    $file_type = wp_check_filetype( $path_info['basename'] );

    if ( ! $file_type['ext'] ) {
        return;
    }

    require_once( ABSPATH . 'wp-admin/includes/media.php' );
    require_once( ABSPATH . 'wp-admin/includes/file.php' );
    require_once( ABSPATH . 'wp-admin/includes/image.php' );

    $media_title = $path_info['basename'];

    $tmp_name = download_url( $url );

    if ( is_wp_error( $tmp_name ) ) {
        error_log( print_r( $tmp_name, true ) );
    }

    $file = array(
        'name' => $media_title,
        'tmp_name' => $tmp_name,
    );

    try {
        $media_id = media_handle_sideload(
            $file, 0, null, array(
                'post_author' => 0,
                'post_name' => sanitize_title( $media_title ),
            )
        );
    } catch ( \Exception $e ) {
        error_log( print_r( $e, true ) );
    }

    if ( is_wp_error( $media_id ) ) {
        error_log( print_r( $tmp_name, true ) );
    }
}

Testing

I've tried to test adding these error_log lines into method pdf_load_source of class WP_Image_Editor_Imagick (file wp-includes/class-wp-image-editor-imagick.php)

<?php

class WP_Image_Editor_Imagick extends WP_Image_Editor {

    // ...    

    protected function pdf_load_source() {
        error_log( "Into pdf_load_source" );
        $filename = $this->pdf_setup();
        error_log( "Filename: " . print_r( $filename, true ) );

        if ( is_wp_error( $filename ) ) {
            return $filename;
        }

        try {
            error_log( "Trying with " . print_r( $this->image, true ) );
            // When generating thumbnails from cropped PDF pages, Imagemagick uses the uncropped
            // area (resulting in unnecessary whitespace) unless the following option is set.
            $this->image->setOption( 'pdf:use-cropbox', true );
            error_log( "Option use cropbox true" );

            // Reading image after Imagick instantiation because `setResolution`
            // only applies correctly before the image is read.
            $this->image->readImage( $filename );
            error_log( "Image read tried" );
        } catch ( Exception $e ) {
            error_log( "Catched" );
            // Attempt to run `gs` without the `use-cropbox` option. See #48853.
            $this->image->setOption( 'pdf:use-cropbox', false );
            error_log( "Option use cropbox false" . print_r( '', true ) );

            $this->image->readImage( $filename );
            error_log( "Image read" . print_r( '', true ) );
        }

        return true;
    }

    // ... 
}

with this result in debug.log:

[23-Mar-2022 14:36:23 UTC] Into pdf_load_source
[23-Mar-2022 14:36:23 UTC] Filename: /<host_path>/wp-content/uploads/2022/03/Product-XXXXX-FilamentClear_2018-1.pdf[0]
[23-Mar-2022 14:36:23 UTC] Trying with Imagick Object
(
)

[23-Mar-2022 14:36:23 UTC] Option use cropbox true

And none of the following error_log prints coming after this last line.

Other details

• This happens with some pdf files (the one from the url in the code being one of them)
• I've tried changing php version to the latest 8.1, but the issue persists