[Dovecot] 1.1rc5 Panic: mailbox-tree.c: line 171 (mailbox_tree_iterate_set_next_node)

[Jeffrey Rice]

Hi,
I do hope this hasn't been covered.  I googled and looked in the 
archives but didn't see anything related, so hopefully I am not covering 
old ground.

I recently upgraded from 1.0.10 to 1.1rc5.

I am seeing this error from clients:

May 25 11:01:54 finity dovecot: Panic: IMAP(xxx at here.org): file 
mailbox-tree.c: line 171 (mailbox_tree_iterate_set_next_node): assertion 
failed: (len <= ctx->parent_pos)

May 25 10:21:19 finity dovecot: IMAP(xxx at here.org): Raw backtrace: imap 
[0x80ced44] -> imap [0x80ce99a] -> imap [0x80a0c63] -> 
imap(maildir_list_iter_next+0x33) [0x806ba53] -> imap [0x805c49b] -> 
imap(cmd_list_full+0x4b2) [0x805d1d2] -> imap(cmd_lsub+0x1a) [0x805d55a] 
-> imap [0x805f83c] -> imap [0x805f8e5] -> imap [0x80600c5] -> 
imap(client_input+0x5e) [0x80602ce] -> imap(io_loop_handler_run+0x110) 
[0x80d6ad0] -> imap(io_loop_run+0x28) [0x80d5d28] -> imap(main+0x4a1) 
[0x8067e71] -> /lib/libc.so.6(__libc_start_main+0xe0) [0xb7de6450] -> 
imap [0x8059d61]


##
In my old install, I did have
mail_extra_groups = vmail

I commented that out and put in:

mail_access_groups = vmail
mail_privileged_group = vmail

The documentation on these parameters is a bit light, so I'm not sure 
which (or both) to use.  Can someone clarify?  All the maildirs are 
owned by group vmail.


### dovecot -n
# 1.1.rc5: /etc/dovecot/dovecot.conf
ssl_cert_file: /etc/dovecot/ssl/certs/dovecot_cert.pem
ssl_key_file: /etc/dovecot/ssl/private/dovecot_key.pem
ssl_cipher_list: ALL:!LOW
login_dir: /usr/local/var/run/dovecot/login
login_executable: /usr/local/libexec/dovecot/imap-login
login_greeting: IMAP ready.
login_process_per_connection: no
login_processes_count: 1
mail_access_groups: vmail
mail_location: maildir:/home/vmail/%u
maildir_copy_preserve_filename: yes
mail_process_size: 70
auth default:
   mechanisms: plain cram-md5 login
   passdb:
     driver: sql
     args: /etc/dovecot/dovecot-mysql.cnf
   userdb:
     driver: passwd
   userdb:
     driver: static
     args: uid=5000 gid=5000 home=/home/vmail/%u/home
   socket:
     type: listen
     client:
       path: /var/spool/postfix/private/dovecot-auth-client
       mode: 432
       user: postfix
       group: postfix