I downloaded and installed dovecot 1.1 nightly build yesterday. Here is a the errors I collected from the log file.

dovecot: Aug 15 14:19:29 Error: IMAP(use@doamin): Log synchronization error at seq=7,offset=24 for /data2/mail/we/webmail.us/ji/jing/dovecot.index: Extension introduction for unknown id 2 dovecot: Aug 15 14:19:29 Error: IMAP(use@doamin): Log synchronization error at seq=7,offset=52 for /data2/mail/we/webmail.us/ji/jing/dovecot.index: Extension introduction for unknown id 2 dovecot: Aug 15 14:19:29 Error: IMAP(use@doamin): Log synchronization error at seq=7,offset=80 for /data2/mail/we/webmail.us/ji/jing/dovecot.index: Extension record updated without intro prefix dovecot: Aug 15 14:19:29 Error: IMAP(use@doamin): Log synchronization error at seq=7,offset=416 for /data2/mail/we/webmail.us/ji/jing/dovecot.index: Extension introduction for unknown id 0 dovecot: Aug 15 14:19:29 Error: IMAP(use@doamin): Log synchronization error at seq=7,offset=444 for /data2/mail/we/webmail.us/ji/jing/dovecot.index: Extension header update without intro prefix dovecot: Aug 15 14:19:29 Error: IMAP(use@doamin): Log synchronization error at seq=7,offset=528 for /data2/mail/we/webmail.us/ji/jing/dovecot.index: Extension introduction for unknown id 0 dovecot: Aug 15 14:19:29 Error: IMAP(use@doamin): Log synchronization error at seq=7,offset=556 for /data2/mail/we/webmail.us/ji/jing/dovecot.index: Extension header update without intro prefix dovecot: Aug 15 14:19:29 Error: IMAP(use@doamin): Log synchronization error at seq=7,offset=776 for /data2/mail/we/webmail.us/ji/jing/dovecot.index: Extension introduction for unknown id 2 dovecot: Aug 15 14:19:29 Error: IMAP(use@doamin): Log synchronization error at seq=7,offset=804 for /data2/mail/we/webmail.us/ji/jing/dovecot.index: Extension introduction for unknown id 3 dovecot: Aug 15 14:19:29 Error: IMAP(use@doamin): Log synchronization error at seq=7,offset=832 for /data2/mail/we/webmail.us/ji/jing/dovecot.index: Extension introduction for unknown id 2 dovecot: Aug 15 14:19:29 Error: IMAP(use@doamin): Log synchronization error at seq=7,offset=876 for /data2/mail/we/webmail.us/ji/jing/dovecot.index: Extension introduction for unknown id 3 dovecot: Aug 15 14:19:29 Error: IMAP(use@doamin): Sending log messages too fast, throttling.. dovecot: Aug 15 14:19:29 Error: child 8898 (imap) killed with signal 6 dovecot: Aug 15 14:19:29 Info: IMAP(use@doamin): Disconnected: Logged out bytes=36/238 dovecot: Aug 15 14:19:30 Error: IMAP(use@doamin): Log synchronization error at seq=7,offset=920 for /data2/mail/we/webmail.us/ji/jing/dovecot.index: Extension introduction for unknown id 2 dovecot: Aug 15 14:19:30 Error: IMAP(use@doamin): Log synchronization error at seq=7,offset=948 for /data2/mail/we/webmail.us/ji/jing/dovecot.index: Extension introduction for unknown id 2 dovecot: Aug 15 14:19:30 Error: IMAP(use@doamin): file mail-index-sync-keywords.c: line 285 (mail_index_sync_keywords): assertion failed: (rec->modify_type == MODIFY_REMOVE) dovecot: Aug 15 14:19:30 Error: IMAP(use@doamin): Raw backtrace: imap [0x80badb6] -> imap [0x80ba903] -> imap(mail_index_sync_keywords+0xee) [0x80ac3e6] -> imap(mail_index_sync_record+0x393) [0x80a0437] -> imap(mail_index_sync_map+0x208) [0x80a075c] -> imap(mail_index_map+0x89) [0x809b059] -> imap [0x8098907] -> imap [0x8098b39] -> imap(mail_index_open+0x133) [0x8098c73] -> imap(index_storage_mailbox_open+0x75) [0x8092e71] -> imap [0x806de18] -> imap [0x806dfb6] -> /usr/lib/dovecot/imap/lib10_quota_plugin.so [0x119de8] -> imap(mailbox_open+0x50) [0x80ae1ec] -> imap(_cmd_select_full+0x76) [0x805da4e] -> imap(cmd_select+0x10) [0x805dcbc] -> imap [0x805fa22] -> imap [0x805f941] -> imap [0x805fab1] -> imap(_client_input+0x56) [0x805fb6e] -> imap(io_loop_handler_run+0x100) [0x80bff0c] -> imap(io_loop_run+0x2d) [0x8066b21] -> imap(main+0x64) [0x8066518] -> /lib/tls/libc.so.6(__libc_start_main+0xda) [0x6db78a] -> imap(__fxstat64+0x71) [0x8059605]

Thanks,

Wenjie