[Messenger / Mailer] Sending an email with binary attachment async fails

Symfony version(s) affected: 4.3.5

Description
When trying to send an email with a binary attachment asynchronously, Symfony encounters an exception and fails.

How to reproduce

set up async sending using the Messenger component
attach a PDF to the email being formed. Mine is templated, and I'm attachin the PDF as a string, but I doubt it matters.

Possible Solution

Additional context
I tried attaching the first 20 bytes of the PDF, here's the code extract just in case:

$email = new TemplatedEmail();
$fileName = sprintf('%s.pdf', $object->getName());
$email
  ->to($recipient)
  ->subject('Subject')
  ->htmlTemplate('email/template.html.twig')
  ->context([
    'some_var' => $someVar,
    'other_var' => $otherVar,
  ])
  // $pdf is a TCPDF object
  ->attach(substr($pdf->output($fileName, 'S'), 0, 20), $fileName, 'application/pdf');

$this->mailer->send($email);

and here's the resulting crash log from docker output:

php_1    | 2019-10-08T14:59:19+00:00 [debug] INSERT INTO messenger_messages (body, headers, queue_name, created_at, available_at) VALUES(?, ?, ?, ?, ?)
php_1    | 2019-10-08T14:59:19+00:00 [critical] Uncaught PHP Exception Symfony\Component\Messenger\Exception\HandlerFailedException: "An exception occurred while executing 'INSERT INTO messenger_messages (body, headers, queue_name, created_at, available_at) VALUES(?, ?, ?, ?, ?)' with params 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php_1    | 1\x62\x73\x74\x72\x61\x63\x74\x48\x65\x61\x64\x65\x72\x5c\x30\x6c\x61\x6e\x67\x5c\x22\x3b\x4e\x3b\x73\x3a\x35\x33\x3a\x5c\x22\x5c\x30\x53\x79\x6d\x66\x6f\x6e\x79\x5c\x5c\x43\x6f\x6d\x70\x6f\x6e\x65\x6e\x74\x5c\x5c\x4d\x69\x6d\x65\x5c\x5c\x48\x65\x61\x64\x65\x72\x5c\x5c\x41\x62\x73\x74\x72\x61\x63\x74\x48\x65\x61\x64\x65\x72\x5c\x30\x63\x68\x61\x72\x73\x65\x74\x5c\x22\x3b\x73\x3a\x35\x3a\x5c\x22\x75\x74\x66\x2d\x38\x5c\x22\x3b\x7d\x7d\x73\x3a\x37\x3a\x5c\x22\x73\x75\x62\x6a\x65\x63\x74\x5c\x22\x3b\x61\x3a\x31\x3a\x7b\x69\x3a\x30\x3b\x4f\x3a\x34\x38\x3a\x5c\x22\x53\x79\x6d\x66\x6f\x6e\x79\x5c\x5c\x43\x6f\x6d\x70\x6f\x6e\x65\x6e\x74\x5c\x5c\x4d\x69\x6d\x65\x5c\x5c\x48\x65\x61\x64\x65\x72\x5c\x5c\x55\x6e\x73\x74\x72\x75\x63\x74\x75\x72\x65\x64\x48\x65\x61\x64\x65\x72\x5c\x22\x3a\x35\x3a\x7b\x73\x3a\x35\x35\x3a\x5c\x22\x5c\x30\x53\x79\x6d\x66\x6f\x6e\x79\x5c\x5c\x43\x6f\x6d\x70\x6f\x6e\x65\x6e\x74\x5c\x5c\x4d\x69\x6d\x65\x5c\x5c\x48\x65\x61\x64\x65\x72\x5c\x5c\x55\x6e\x73\x74\x72\x75\x63\x74\x75\x72\x65\x64\x48\x65\x61\x64\x65\x72\x5c\x30\x76\x61\x6c\x75\x65\x5c\x22\x3b\x73\x3a\x34\x36\x3a\x5c\x22\x43\x72\x69\x63\x6b\x65\x74\x20\x70\x72\x61\x63\x74\x69\x63\x65\x20\x70\x6c\x61\x6e\x20\x68\x61\x73\x20\x62\x65\x65\x6e\x20\x73\x68\x61\x72\x65\x64\x20\x77\x69\x74\x68\x20\x79\x6f\x75\x5c\x22\x3b\x73\x3a\x35\x30\x3a\x5c\x22\x5c\x30\x53\x79\x6d\x66\x6f\x6e\x79\x5c\x5c\x43\x6f\x6d\x70\x6f\x6e\x65\x6e\x74\x5c\x5c\x4d\x69\x6d\x65\x5c\x5c\x48\x65\x61\x64\x65\x72\x5c\x5c\x41\x62\x73\x74\x72\x61\x63\x74\x48\x65\x61\x64\x65\x72\x5c\x30\x6e\x61\x6d\x65\x5c\x22\x3b\x73\x3a\x37\x3a\x5c\x22\x53\x75\x62\x6a\x65\x63\x74\x5c\x22\x3b\x73\x3a\x35\x36\x3a\x5c\x22\x5c\x30\x53\x79\x6d\x66\x6f\x6e\x79\x5c\x5c\x43\x6f\x6d\x70\x6f\x6e\x65\x6e\x74\x5c\x5c\x4d\x69\x6d\x65\x5c\x5c\x48\x65\x61\x64\x65\x72\x5c\x5c\x41\x62\x73\x74\x72\x61\x63\x74\x48\x65\x61\x64\x65\x72\x5c\x30\x6c\x69\x6e\x65\x4c\x65\x6e\x67\x74\x68\x5c\x22\x3b\x69\x3a\x37\x36\x3b\x73\x3a\x35\x30\x3a\x5c\x22\x5c\x30\x53\x79\x6d\x66\x6f\x6e\x79\x5c\x5c\x43\x6f\x6d\x70\x6f\x6e\x65\x6e\x74\x5c\x5c\x4d\x69\x6d\x65\x5c\x5c\x48\x65\x61\x64\x65\x72\x5c\x5c\x41\x62\x73\x74\x72\x61\x63\x74\x48\x65\x61\x64\x65\x72\x5c\x30\x6c\x61\x6e\x67\x5c\x22\x3b\x4e\x3b\x73\x3a\x35\x33\x3a\x5c\x22\x5c\x30\x53\x79\x6d\x66\x6f\x6e\x79\x5c\x5c\x43\x6f\x6d\x70\x6f\x6e\x65\x6e\x74\x5c\x5c\x4d\x69\x6d\x65\x5c\x5c\x48\x65\x61\x64\x65\x72\x5c\x5c\x41\x62\x73\x74\x72\x61\x63\x74\x48\x65\x61\x64\x65\x72\x5c\x30\x63\x68\x61\x72\x73\x65\x74\x5c\x22\x3b\x73\x3a\x35\x3a\x5c\x22\x75\x74\x66\x2d\x38\x5c\x22\x3b\x7d\x7d\x7d\x73\x3a\x34\x39\x3a\x5c\x22\x5c\x30\x53\x79\x6d\x66\x6f\x6e\x79\x5c\x5c\x43\x6f\x6d\x70\x6f\x6e\x65\x6e\x74\x5c\x5c\x4d\x69\x6d\x65\x5c\x5c\x48\x65\x61\x64\x65\x72\x5c\x5c\x48\x65\x61\x64\x65\x72\x73\x5c\x30\x6c\x69\x6e\x65\x4c\x65\x6e\x67\x74\x68\x5c\x22\x3b\x69\x3a\x37\x36\x3b\x7d\x69\x3a\x31\x3b\x4e\x3b\x7d\x7d\x7d\x7d\x73\x3a\x36\x31\x3a\x5c\x22\x5c\x30\x53\x79\x6d\x66\x6f\x6e\x79\x5c\x5c\x43\x6f\x6d\x70\x6f\x6e\x65\x6e\x74\x5c\x5c\x4d\x61\x69\x6c\x65\x72\x5c\x5c\x4d\x65\x73\x73\x65\x6e\x67\x65\x72\x5c\x5c\x53\x65\x6e\x64\x45\x6d\x61\x69\x6c\x4d\x65\x73\x73\x61\x67\x65\x5c\x30\x65\x6e\x76\x65\x6c\x6f\x70\x65\x5c\x22\x3b\x4e\x3b\x7d\x7d", "[]", "default", "2019-10-08T14:59:19", "2019-10-08T14:59:19"]:
php_1    | SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect string value: '\xE2\xE3\xCF\xD3\x0A7...' for column `icc`.`messenger_messages`.`body` at row 1" at /srv/app/vendor/symfony/messenger/Middleware/HandleMessageMiddleware.php line 82

I tried changing the body and headers fields of the messenger_messages DB table to longblob, but it didn't fix the issue. I suppose encoding the body in b64 or qp before attempting to store it could help.

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[Messenger / Mailer] Sending an email with binary attachment async fails #33913

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[Messenger / Mailer] Sending an email with binary attachment async fails #33913

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