The special handling of the post_max_size error is located here:

symfony/src/Symfony/Component/Form/Extension/HttpFoundation/HttpFoundationRequestHandler.php

Lines 73 to 90 in 6e03a42

    
           // Mark the form with an error if the uploaded size was too large 
        
           // This is done here and not in FormValidator because $_POST is 
        
           // empty when that error occurs. Hence the form is never submitted. 
        
           $contentLength = $this->serverParams->getContentLength(); 
        
           $maxContentLength = $this->serverParams->getPostMaxSize(); 
        
           if (!empty($maxContentLength) && $contentLength > $maxContentLength) { 
        
               // Submit the form, but don't clear the default values 
        
               $form->submit(null, false); 
        
               $form->addError(new FormError( 
        
                   $form->getConfig()->getOption('post_max_size_message'), 
        
                   null, 
        
                   array('{{ max }}' => $this->serverParams->getNormalizedIniPostMaxSize()) 
        
               )); 
        
               return; 
        
           }

	// Mark the form with an error if the uploaded size was too large
	// This is done here and not in FormValidator because $_POST is
	// empty when that error occurs. Hence the form is never submitted.
	$contentLength = $this->serverParams->getContentLength();
	$maxContentLength = $this->serverParams->getPostMaxSize();

	if (!empty($maxContentLength) && $contentLength > $maxContentLength) {
	// Submit the form, but don't clear the default values
	$form->submit(null, false);

	$form->addError(new FormError(
	$form->getConfig()->getOption('post_max_size_message'),
	null,
	array('{{ max }}' => $this->serverParams->getNormalizedIniPostMaxSize())
	));

	return;
	}

Uh oh!

When post_max_size is reached, CSRF error is triggered #19140

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