which version of wordpress are you using?

I've only tested with the latest WordPress version (4.8.2).

It may be only /wp-admin/index.php that triggers the problem. If clicking around in wp-admin's navigation to other pages besides /wp-admin/index.php and /wp-admin/index.php has not been requested since FPM was restarted, the other wp-admin pages don't crash.

Trying to narrow down the code where the crash is happening, here is the chain of function calls that, if any of them are not performed, the crash doesn’t happen.

In wp-admin/index.php crashes at:
<?php wp_dashboard(); ?>

Which is in wp-admin/includes/dashboard.php and crashes at:
<?php do_meta_boxes( $screen->id, 'side', '' ); ?>

Which is in wp-admin/includes/template.php and crashes at:
call_user_func($box['callback'], $object, $box);

This is the var_dump() output of $box['callback'] when it crashes:

string(24) "wp_dashboard_quick_press"

That function is in wp-admin/includes/dashboard.php and crashes at:
wp_dashboard_recent_drafts();

Which is in wp-admin/includes/dashboard.php and crashes at:
$drafts = get_posts( $query_args );

Which is in wp-includes/post.php and crashes at:
return $get_posts->query($r);

Which is in wp-includes/class-wp-query.php and crashes at:
return $this->get_posts();

I’m not sure where in WP_Query::get_posts() it’s crashing. Unfortunately I don’t have time to dig into it right now.

I hope that helps.

Here's the rest of following the code until where it crashes.

In wp-includes/class-wp-query.php crashes at
$q['orderby'] = addslashes_gpc( $q['orderby'] );

Which is in wp-includes/formatting.php and crashes when calling:
return wp_slash($gpc);

Which is in the same file (wp-includes/formatting.php) and crashes at:
$value = addslashes( $value );

The var_dump of $value at that time is:

string(8) "modified"

The entire wp_slash() function is:

function wp_slash( $value ) {
	if ( is_array( $value ) ) {
		foreach ( $value as $k => $v ) {
			if ( is_array( $v ) ) {
				$value[$k] = wp_slash( $v );
			} else {
				$value[$k] = addslashes( $v );
			}
		}
	} else {
		$value = addslashes( $value );
	}
	return $value;
}

please give an access to your box, you could send me via mail.  thanks

I've emailed access info for a test box to you. Thanks!