From the log:
Jul 11 13:12:42 mproxy dovecot: imap-login: Login: user=<hildeb>, method=PLAIN, rip=141.42.206.36, lip=141.42.206.11, mpid=27254, TLS, session=
Jul 11 13:12:44 mproxy dovecot: imap(hildeb): Panic: file imap-client.c: line 854 (client_check_command_hangs): assertion failed: ((io_loop_find_fd_conditions(current_ioloop, client->fd_out) & IO_WRITE) != 0)
Jul 11 13:12:44 mproxy dovecot: imap(hildeb): Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(+0x8e09e)
[0x7efd1d3a309e] -> /usr/lib/dovecot/libdovecot.so.0(+0x8e18c)
[0x7efd1d3a318c] -> /usr/lib/dovecot/libdovecot.so.0(i_fatal+0)
[0x7efd1d34169e] -> dovecot/imap hildeb 141.42.206.36 UID FETCH - 8192 bytes waiting corked
[0x55649b35cd42] -> dovecot/imap hildeb 141.42.206.36 UID FETCH - 8192 bytes waiting corked
[0x55649b35ce68] -> /usr/lib/dovecot/libdovecot.so.0(+0xaf370)
[0x7efd1d3c4370] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x4c)
[0x7efd1d3b715c] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x101)
[0x7efd1d3b85b1] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x25)
[0x7efd1d3b71e5] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x30)
[0x7efd1d3b7380] -> /usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13)
[0x7efd1d347c13] -> dovecot/imap hildeb 141.42.206.36 UID FETCH - 8192 bytes waiting corked [0x55649b34faf2] -> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)
[0x7efd1cf6c830] -> dovecot/imap hildeb 141.42.206.36 UID FETCH - 8192 bytes waiting corked [0x55649b34fc6f]
Jul 11 13:12:44 mproxy dovecot: imap(hildeb): Fatal: master: service(imap): child 27254 killed with signal 6 (core dumped)
# 2.3.0.alpha0 (3aae884) [XI:2:2.3.0~alpha0-1~auto+197]: /etc/dovecot/dovecot.conf
--
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@charite.de | http://www.charite.de