Here's the full back trace:
#0 0xb7434d23 in strchr () from /lib/i686/cmov/libc.so.6 No symbol table info available. #1 0x0805e02e in net_addr2ip (addr=0x0, ip=0xbf93c3dc) at network.c:619 No locals. #2 0x0804f01a in login_proxy_is_ourself (client=0x93b5060, host=0x0, port=143, destuser=0x93b8c08 "resource") at login-proxy.c:322 ip = {family = 14143, u = {ip6 = {__in6_u = { __u6_addr8 = "\300\241:\t&\241:\t\004\000\000\000`P;\t", __u6_addr16 = {41408, 2362, 41254, 2362, 4, 0, 20576, 2363}, __u6_addr32 = {154837440, 154837286, 4, 154882144}}}, ip4 = {s_addr = 154837440}}} #3 0x0804d612 in imap_proxy_new (client=0x93b5060, host=0x0, port=143, user=0x93b8c08 "resource", master_user=0x0, password=0x93aa12b "debian", ssl_flags=0, connect_timeout_msecs=0) at imap-proxy.c:448 __PRETTY_FUNCTION__ = "imap_proxy_new" #4 0x0804cea4 in client_handle_args (client=<value optimized out>, args=<value optimized out>, success=58, nodelay_r=0xbf93c50f) at client-authenticate.c:200 reason = 0x0 host = 0x0 destuser = 0x93b8c08 "resource" pass = 0x93aa12b "debian" master_user = 0x0 key = 0x0 value = <value optimized out> ssl_flags = 0 reply = <value optimized out> port = 143 proxy_timeout_msecs = 0 proxy = true temp = false nologin = false authz_failure = false #5 0x0804d3a4 in sasl_callback (_client=0x93b5060, reply=SASL_SERVER_REPLY_SUCCESS, data=0x0, args=0x3a3a3a3a) at client-authenticate.c:283 iov = {{iov_base = 0x0, iov_len = 3214132568}, {iov_base = 0x80516fb, iov_len = 154837271}, {iov_base = 0x0, iov_len = 131}} msg = <value optimized out> nodelay = <value optimized out> __PRETTY_FUNCTION__ = "sasl_callback" #6 0x0805116f in call_client_callback (client=0x0, reply=976894522, data=0x3a3a
, args=0x93aa13c) at sasl-server.c:36 sasl_callback = 0x804d250*dovecot -n* # 1.2.15: /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-3-686 i686 Debian squeeze/sid log_timestamp: %Y-%m-%d %H:%M:%S protocols: imap managesieve listen(default): * listen(imap): * listen(managesieve): *:2000 ssl: no disable_plaintext_auth: no login_dir: /var/run/dovecot/login login_executable(default): /usr/lib/dovecot/imap-login -D login_executable(imap): /usr/lib/dovecot/imap-login -D login_executable(managesieve): /usr/lib/dovecot/managesieve-login mail_privileged_group: mail mail_location: maildir:~/Maildir mmap_disable: yes mail_nfs_storage: yes mail_nfs_index: yes mbox_write_locks: fcntl dotlock mail_executable(default): /usr/lib/dovecot/imap mail_executable(imap): /usr/lib/dovecot/imap mail_executable(managesieve): /usr/lib/dovecot/managesieve mail_plugins(default): quota mail_plugins(imap): quota mail_plugins(managesieve): mail_plugin_dir(default): /usr/lib/dovecot/modules/imap mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap mail_plugin_dir(managesieve): /usr/lib/dovecot/modules/managesieve managesieve_logout_format(default): bytes=%i/%o managesieve_logout_format(imap): bytes=%i/%o managesieve_logout_format(managesieve): bytes=%i%o lda: postmaster_address: sogone@djb.hell.qua mail_plugins: quota sieve deliver_log_format: msgid=%m: %$ sendmail_path: /usr/lib/sendmail log_path: /var/log/ldaone info_log_path: /var/log/ldatwo debug: yes auth default: debug: yes passdb: driver: ldap args: /etc/dovecot/dovecot-ldap.deny deny: yes passdb: driver: ldap args: /etc/dovecot/dovecot-ldap.pass userdb: driver: prefetch userdb: driver: ldap args: /etc/dovecot/dovecot-ldap.user socket: type: listen master: path: /var/run/dovecot/auth-master mode: 438 plugin: quota: maildir sieve: ~/.dovecot.sieve sieve_dir: ~/sieve