Bug 173906

Summary:	imap index tree corruption on NFS mounted homedirs
Product:	[Fedora] Fedora	Reporter:	Fabrice Bellet <fabrice>
Component:	dovecot	Assignee:	John Dennis <jdennis>
Status:	CLOSED NEXTRELEASE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4	CC:	fabrice, tss, wtogami
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-11-22 16:37:43 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Fabrice Bellet 2005-11-22 14:31:49 UTC

Description of problem:

dovecot is accessed with squirrelmail with the imap protocol, on an up-to-date
fedora core 4. When performing (delete) "move to trash" operation with
squirrelmail, the following error message appears in the mailog, and the move
operation is aborted :

Nov 22 14:56:10 tux imap(bellet): Corrupted binary tree file
/misc/raid/bellet/mail/.imap/Trash/.imap.index.tree: UID to be inserted isn't
higher than existing (273 <= 274)

Refreshing the view of the inbox allows to continue with the imap session.

This error is not 100% reproductible, but occurs more frequently, when :
  . large amount of messages are deleted in the webmail
  . new messages are delivered to the inbox in parallel.

The particularity of the homedir is that it is mounted over NFS, via the
automounter, with the following options :

disk.creatis.insa-lyon.fr:/mnt/raid /misc/raid nfs
rw,mand,v3,rsize=32768,wsize=32768,soft,intr,tcp,lock,addr=disk.creatis.insa-lyon.fr
0 0

A simple way to reproduce this problem is to setup an NFS mounted home
directory, deliver mail to this user on a periodic interval, and delete these
messages in parallel with squirrelmail.

dovecot.conf contains these options :
protocols = imap imaps pop3 pop3s
imap_listen = [::]
pop3_listen = [::]
imaps_listen = [::]
pop3s_listen = [::]
ssl_cert_file = /etc/pki/dovecot/dovecot.pem
ssl_key_file = /etc/pki/dovecot/private/dovecot.pem
login_dir = /var/run/dovecot-login
login = imap
login = pop3
first_valid_uid = 100
mbox_locks = fcntl
auth = default
auth_mechanisms = plain
auth_userdb = passwd
auth_passdb = pam
auth_user = root

Comment 1 Timo Sirainen 2005-11-22 15:07:54 UTC

0.99.x Dovecot doesn't support having index files in NFS mounted directories,
don't do it.

1.0-alpha versions support it with setting mmap_disable=yes, but it still has
some problems.

Append eg. :INDEX=/var/indexes/%u to default_mail_env to move indexes elsewhere.

Comment 2 Fabrice Bellet 2005-11-22 16:37:43 UTC

Thanks for the hint ! I didn't read the documentation carefully and missed this
point. I appended ":INDEX=MEMORY" instead, because the machine has many
accounts, and I'm a lazy sysadmin :-) I think I can live with the cpu overhead.
Now it works.