[Dovecot] Dovecot 2.1.1 crash

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Dovecot RPM from atrpms crashed, here are the logs:

Aug 31 11:55:08 10.123.128.231 dovecot: imap(user@domain): Panic: 
Message count decreased
Aug 31 11:55:08 10.123.128.231 dovecot: imap(user@domain): Error: Raw 
backtrace: /usr/lib64/dovecot/libdovecot.so.0(+0x4184a) [0x7f144f00384a] 
-> /usr/lib64/dovecot/libdovecot.so.0(+0x41896) [0x7f144f003896] -> 
/usr/lib64/dovec
ot/libdovecot.so.0(+0x1934a) [0x7f144efdb34a] -> dovecot/imap() 
[0x417ba9] -> dovecot/imap() [0x40a636] -> dovecot/imap() [0x40a96c] -> 
dovecot/imap(command_exec+0x3d) [0x410a5d] -> 
dovecot/imap(client_command_cancel+0x3a) [0x40f3da] ->
dovecot/imap(client_destroy+0xdd) [0x41025d] -> 
/usr/lib64/dovecot/libdovecot.so.0(io_loop_call_io+0x36) 
[0x7f144f00fd16] -> 
/usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0x9f) 
[0x7f144f010d9f] -> /usr/lib64/dovecot/libdovecot.s
o.0(io_loop_run+0x28) [0x7f144f00fcb8] -> 
/usr/lib64/dovecot/libdovecot.so.0(master_service_run+0x13) 
[0x7f144effc0d3] -> dovecot/imap(main+0x29d) [0x418a0d] -> 
/lib64/libc.so.6(__libc_start_main+0xfd) [0x7f144ec4dcdd] -> dovecot/imap()
[0x408469]
Aug 31 11:55:09 10.123.128.231 dovecot: imap(user@domain): Fatal: 
master: service(imap): child 20986 killed with signal 6 (core dumps 
disabled)

Doveconf -n:

# 2.1.1: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-279.19.1.el6.x86_64 x86_64 CentOS release 6.3 (Final)
auth_master_user_separator = *
auth_mechanisms = plain login
disable_plaintext_auth = no
first_valid_uid = 300
mail_fsync = always
mail_location = maildir:~/Maildir
mail_nfs_index = yes
mail_nfs_storage = yes
mbox_write_locks = fcntl
mmap_disable = yes
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix =
}
passdb {
  args = /etc/dovecot/sql.conf.ext
  driver = sql
}
service imap-login {
  inet_listener imap {
    port = 143
  }
  process_min_avail = 4
  service_count = 0
  vsz_limit = 128 M
}
service pop3-login {
  inet_listener pop3 {
    port = 110
  }
  process_min_avail = 4
  service_count = 0
  vsz_limit = 128 M
}
ssl_ca = </usr/local/admin/certs/wildcard.ca
ssl_cert = </usr/local/admin/certs/wildcard.crt
ssl_key = </usr/local/admin/certs/wildcard.key
userdb {
  args = /etc/dovecot/telco-sql.conf.ext
  driver = sql
}
protocol imap {
  mail_max_userip_connections = 30
}