[Dovecot] 1.2.11 nfs_flush_file_handle_cache_dir problems

[Ade Fewings]

Hi chaps

We're using the mbox_snarf plugin to snarf mail from /var/mail/%U to
~%U/Mail/inbox and using dotlocking on all accesses.  This is on Solaris
with NFS mounted home directories.

We're getting a few (very few) of these for just a couple of users:

Error: nfs_flush_file_handle_cache_dir: rmdir(/var/mail) failed: Device busy

Which, having searched, I see some discussion of in the past, but not
with 1.2.  We're using:

mail_privileged_group = mail

For the /var/mail 'inboxes', which I thought would tackle this problem. 

Couple of questions, if you don't mind:
1. Does dovecot user need to be a member of the mail group?
2. Does this error message represent a real problem that needs solving? 
It's very strange how rare it is and that only a few select users have
encountered.

Full dovecot.conf below:

> # 1.2.11: /usr/local/dovecot-1.2.11-b/etc/dovecot.conf
> # OS: SunOS 5.10 sun4v
> log_path: /usr/local/dovecot/var/dovecot.log
> protocols: imap imaps pop3 pop3s
> listen(default): *:143 *:10143 *:20143 *:30143 *:40143 *:50143
> listen(imap): *:143 *:10143 *:20143 *:30143 *:40143 *:50143
> listen(pop3): *:110
> ssl_listen(default): *:993 *:10993
> ssl_listen(imap): *:993 *:10993
> ssl_listen(pop3): *:995
> ssl: no
> ssl_cipher_list: MEDIUM:!LOW
> disable_plaintext_auth: no
> shutdown_clients: no
> login_dir: /usr/local/dovecot-1.2.11-b/var/run/dovecot/login
> login_executable(default):
> /usr/local/dovecot-1.2.11-b/libexec/dovecot/imap-login
> login_executable(imap):
> /usr/local/dovecot-1.2.11-b/libexec/dovecot/imap-login
> login_executable(pop3):
> /usr/local/dovecot-1.2.11-b/libexec/dovecot/pop3-login
> max_mail_processes: 1024
> verbose_proctitle: yes
> mail_privileged_group: mail
> mail_location: mbox:~/Mail:INBOX=/var/mail/%u
> mail_debug: yes
> mmap_disable: yes
> mail_nfs_storage: yes
> mail_nfs_index: yes
> lock_method: dotlock
> mbox_read_locks: dotlock
> mbox_write_locks: dotlock
> mail_executable(default): /usr/local/dovecot-1.2.11-b/libexec/dovecot/imap
> mail_executable(imap): /usr/local/dovecot-1.2.11-b/libexec/dovecot/imap
> mail_executable(pop3): /usr/local/dovecot-1.2.11-b/libexec/dovecot/pop3
> mail_plugins: mbox_snarf
> mail_plugin_dir(default): /usr/local/dovecot-1.2.11-b/lib/dovecot/imap
> mail_plugin_dir(imap): /usr/local/dovecot-1.2.11-b/lib/dovecot/imap
> mail_plugin_dir(pop3): /usr/local/dovecot-1.2.11-b/lib/dovecot/pop3
> auth default:
>   verbose: yes
>   debug: yes
>   passdb:
>     driver: pam
>   passdb:
>     driver: passwd
>     args: blocking=yes
>   userdb:
>     driver: passwd
>     args: blocking=yes
> plugin:
>   mbox_snarf: ~/Mail/inbox

Much appreciate your time, it has made an amazing difference here, I'm
just seeking absolute perfection I think (well, mbox perfection anyway).

~~
Ade


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