LMTP crashing heavily for my 2.2.36 installation

[Timo Sirainen]

On 11 Jul 2018, at 8.41, Wolfgang Rosenauer <wrosenauer at gmail.com> wrote:
> 
> Hi,
> 
> I'm running 2.2.36 (as provided by openSUSE in their server:mail repository) and at least at one of my systems LMTP is crashing regularly on certain messages (apparently a lot of them).
> 
> Sometimes (but not always a backtrace is posted to the logs:
> 
> 2018-07-11T07:34:56.741848+02:00 saruman dovecot: lmtp(14690): Fatal: master: service(lmtp): child 14690 killed with signal 11 (core dumps disabled)
> 2018-07-11T07:34:56.820474+02:00 saruman dovecot: lmtp(an007498): Panic: file imap-bodystructure.c: line 116 (part_write_body_multipart): assertion failed: (part->data != NULL)
..
> storage.so.0(mail_set_attachment_keywords+0x162) [0x7ff549773662]

Looks like it's because of the "mail_attachment_detection_options = add-flags-on-save" setting. What mailbox format do you use? It's currently broken with mbox and in v2.2.36 with Maildir (which was fixed in v2.3.2).