Panic: file smtp-address.c: line 530 (smtp_address_write): assertion failed: (smtp_char_is_qpair(*p))

[Ralf Hildebrandt]

I have an email which cannot be delivered using LMTP:

Mar  2 15:26:54 mail-cbf dovecot: lmtp(backup at backup.invalid)<29736><cPd5Mi5fmVoodAAAplP5LA>: Panic: file smtp-address.c: line 530 (smtp_address_write): assertion failed: (smtp_char_is_qpair(*p))
Mar  2 15:26:54 mail-cbf dovecot: lmtp(backup at backup.invalid)<29736><cPd5Mi5fmVoodAAAplP5LA>: Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(+0xc6aca) [0x7f7fb50d3aca] -> /usr/lib/dovecot/libdovecot.so.0(+0xc6bad) [0x7f7fb50d3bad] ->
/usr/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7f7fb5045721] -> /usr/lib/dovecot/libdovecot.so.0(smtp_address_write+0x21d)
[0x7f7fb504931d] -> /usr/lib/dovecot/libdovecot.so.0(smtp_address_encode+0x21)
[0x7f7fb5049411] -> /usr/lib/dovecot/libdovecot-lda.so.0(+0x3774)
[0x7f7fb56d0774] -> /usr/lib/dovecot/libdovecot-lda.so.0(+0x3abf)
[0x7f7fb56d0abf] -> /usr/lib/dovecot/libdovecot-storage.so.0(mailbox_save_finish+0x7c)
[0x7f7fb53c858c] -> /usr/lib/dovecot/libdovecot-storage.so.0(mail_storage_copy+0x104)
[0x7f7fb53baeb4] -> /usr/lib/dovecot/libdovecot-storage.so.0(mdbox_copy+0x46)
[0x7f7fb53e13f6] -> /usr/lib/dovecot/libdovecot-lda.so.0(+0x3999)
[0x7f7fb56d0999] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0x48956)
[0x7f7fb53c8956] -> /usr/lib/dovecot/libdovecot-lda.so.0(mail_deliver_save+0x1ac)
[0x7f7fb56d12ac] -> /usr/lib/dovecot/libdovecot-lda.so.0(mail_deliver+0x1f6)
[0x7f7fb56d1916] -> dovecot/lmtp(lmtp_local_data+0x610)
[0x560dfd665dc0] -> dovecot/lmtp(cmd_data_continue+0x233)
[0x560dfd664b53] -> /usr/lib/dovecot/libdovecot.so.0(+0x4a6e0)
[0x7f7fb50576e0] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x69)
[0x7f7fb50eb649] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x109)
[0x7f7fb50ecf29] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x52)
[0x7f7fb50eb752] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x38)
[0x7f7fb50eb968] -> /usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13)
[0x7f7fb50682a3] -> dovecot/lmtp(main+0x23d) [0x560dfd663c3d] -> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)
[0x7f7fb4c63830] -> dovecot/lmtp(_start+0x29) [0x560dfd663d79]
Mar  2 15:26:55 mail-cbf dovecot: lmtp(backup at backup.invalid)<29736><cPd5Mi5fmVoodAAAplP5LA>: Fatal: master: service(lmtp): child 29736 killed with signal 6 (core dumped)

Using  dovecot 2:2.3.0.1-6 packages on Ubuntu 16.04

The address causing the error is:

From: =?utf-8?Q?Dorit_M=C3=BCller?= <d.müller at JOMEC.de>

Note the "umlaut" in the email address... :)
-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebrandt at charite.de | https://www.charite.de