Hello!

Got a panic&assertion failed with LMTP proxy. Target Dovecot LMTP
server hanged and Dovecot LMTP proxy server started logging
panics/assertions. Core dumps were disabled unfortunately, so I don't
know if this is helpful at all:

Dec 29 15:41:58 lmtp(8853): Panic: file lmtp-proxy.c: line 370
(lmtp_proxy_output_timeout): assertion failed: (proxy->data_input->eof) Dec 29 15:41:58 lmtp(8853): Error: Raw backtrace:
/usr/local/dovecot20/lib/dovecot/libdovecot.so.0 [0xb76aa7c1] ->
/usr/local/dovecot20/lib/dovecot/libdovecot.so.0 [0xb76aa83f] ->
/usr/local/dovecot20/lib/dovecot/libdovecot.so.0(i_error+0)
[0xb76aab14] -> dovecot/lmtp [0x804e3f4] ->
/usr/local/dovecot20/lib/dovecot/libdovecot.so.0(io_loop_handle_timeouts+0xe0)
[0xb76b7720] ->
/usr/local/dovecot20/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x8b)
[0xb76b843b] ->
/usr/local/dovecot20/lib/dovecot/libdovecot.so.0(io_loop_run+0x40)
[0xb76b7340] ->
/usr/local/dovecot20/lib/dovecot/libdovecot.so.0(master_service_run+0x2a)
[0xb76a31fa] -> dovecot/lmtp(main+0x170) [0x804b380] ->
/lib/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7516455] ->
dovecot/lmtp [0x804b171] Dec 29 15:41:58 master: Error: service(lmtp): child 8853 killed with
signal 6 (core dumps disabled)

doveconf -n output: $ /usr/local/dovecot20/bin/doveconf -c
/usr/local/dovecot20/etc/dovecot/dovecot-lmtpproxy.conf -n # 2.0.8: /usr/local/dovecot20/etc/dovecot/dovecot-lmtpproxy.conf # OS: Linux 2.6.31.5 i686 Debian 5.0.7 auth_cache_negative_ttl = 0 auth_mechanisms = plain login auth_socket_path = /usr/local/dovecot20/var/run/dovecot-lmtpproxy/auth-userdb auth_username_chars =
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@&: auth_verbose = yes base_dir = /usr/local/dovecot20/var/run/dovecot-lmtpproxy/ disable_plaintext_auth = no listen = * lmtp_proxy = yes log_path = /var/log/dovecot.lmtpproxy/dovecot.lmtpproxy.log login_log_format_elements = user=<%u> service=%s method=%m rip=%r lip=%l %c login_trusted_networks = 172.16.83.64/26 mail_fsync = never mail_gid = 1000 mail_location = maildir:~/Maildir mail_uid = 1000 maildir_very_dirty_syncs = yes passdb { args = /usr/local/dovecot20/etc/dovecot/dovecot-sql.lmtpproxy.alias.conf driver = sql } postmaster_address = postmaster@example.com protocols = lmtp service auth-worker { user = $default_internal_user } service auth { client_limit = 8192 unix_listener auth-userdb { mode = 0666 } } service imap-login { process_min_avail = 1 service_count = 0 vsz_limit = 1 G } service imap { process_limit = 2048 } service lmtp { inet_listener lmtp { address = * port = 24 } process_min_avail = 1 service_count = 0 user = mailuser vsz_limit = 512 M } service pop3-login { process_min_avail = 1 service_count = 0 vsz_limit = 1 G } service pop3 { process_limit = 2048 } ssl = no verbose_proctitle = yes protocol lda { info_log_path = log_path = mail_fsync = optimized } protocol imap { imap_client_workarounds = delay-newmail mail_max_userip_connections = 20 } protocol lmtp { mail_fsync = optimized } protocol pop3 { mail_max_userip_connections = 5 pop3_client_workarounds = outlook-no-nuls oe-ns-eoh }