dovecot - May 2008 - 1.1rc5 Panic: mailbox-tree.c: line 171 (mailbox_tree_iterate_set_next_node)

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

On May 25, 2008, at 8:30 PM, Jeffrey Rice wrote:
> 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)
Any idea how to reproduce this? Could you find out the exact LSUB  
command that causes this? For example enable rawlog for the user: 
http://wiki.dovecot.org/Debugging/Rawlog

Also send me the user's subscriptions file. It most likely has to do  
with what kind of a mailbox hierarchy is used..
> 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.
You shouldn't need the above settings at all.
>  userdb:
>    driver: static
>    args: uid=5000 gid=5000 home=/home/vmail/%u/home
I assume gid=5000 is the vmail? That already gives vmail group access  
to the process.

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Timo Sirainen wrote:
> On May 25, 2008, at 8:30 PM, Jeffrey Rice wrote:
>
>> 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)
>
>

The command in question seems to be:
3 lsub "" "*"

## subscriptions
Phil's Email.Beekeeping
Phil's Email.Family Mail
Phil's Email.Kaiperm Credit Union
Phil's Email.Kiva
Phil's Email.Rob and Jill
INBOX.Sent
INBOX.Trash
INBOX.Drafts
INBOX.Children International
Phil's Email
Sent
Drafts
Phil's Email.Kalamazoo College
Phil's Email.New York Times
Phil's Email.True Majority
Trash
.Sent.Sent-Dec-2006
.Sent.Sent-Jan-2007
.Sent.Sent-Feb-2007
.Sent.Sent-Mar-2007
Phil's Email.PayPal
Phil's Email.Receipts
Phil's Email.Amazon
Phil's Email.Ancestry
Sent.Sent-Dec-2007
##EOF


Could it be the mailboxes with the dot prefix?  I have another user who 
does not generate a crash with the same command, and does not have any 
such mailboxes.
>> 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.
>
> You shouldn't need the above settings at all.
>
OK, so the gid parameter below will give dovecot rw access to the 
maildirs owned by vmail?
>>  userdb:
>>    driver: static
>>    args: uid=5000 gid=5000 home=/home/vmail/%u/home
>
> I assume gid=5000 is the vmail? That already gives vmail group access 
> to the process.
>
Yes.  I did wonder if I had an error here, because home=/home/vmail/%u.  
I don't know where the last "/home" came from.  Removing it
didn't seem
to change the error.

Jeff