dovecot - Jan 2023 - Error: Mailbox INBOX: file_dotlock_create in directory /var/mail failed: Permission denied

Hi All,

We are running Round cube on top of dovecot and postfix as our email 
echo system. Main problem we are facing is that, roundcube loads really 
slow for big inboxes (~5000 emails). I found that, while it loads, imap 
process goes high in terms of CPU utilization(~90%). I asked it in some 
roundcube support group, They believe that it is related to dovecot not 
roundcube. Can you shed any light on this issue. Thanks in advance.

Here is $dovecot -n$ output

xyz at roundcube-internal-server-1:/etc/dovecot$ dovecot -n
# 2.3.16 (7e2e900c1a): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.16 (09c29328)
# OS: Linux 5.15.0-1024-kvm x86_64 Ubuntu 22.04.1 LTS
# Hostname: roundcube-internal-server-1
auth_mechanisms = plain login
disable_plaintext_auth = no
listen = *
lock_method = dotlock
mail_always_cache_fields = date.received
mail_cache_min_mail_count = 5000
mail_location = 
mbox:~/mail:INBOX=/var/mail/%u:INDEX=/var/indexes/isical.ac.in/%n
mail_privileged_group = mail
mail_sort_max_read_count = 100
mailbox_list_index_include_inbox = yes
mailbox_list_index_very_dirty_syncs = yes
maildir_very_dirty_syncs = yes
mbox_dotlock_change_timeout = 1 mins
mbox_lazy_writes = no
mbox_write_locks = dotlock fcntl
namespace inbox {
   inbox = yes
   location    prefix }
passdb {
   driver = pam
}
protocols = imap pop3
ssl_cert = </etc/dovecot/private/dovecot.pem
ssl_client_ca_dir = /etc/ssl/certs
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
userdb {
   driver = passwd
}
protocol !indexer-worker {
   mail_vsize_bg_after_count = 100
}

On a different note we are getting error occasionally of the following 
type. I dont know if they are related.

Jan 16 15:36:13 roundcube-internal-server-1 dovecot: 
imap(xyz)<361270><aqauu17ycsvAqL8/>: Error:
unlink(/var/mail/xyz.lock)
failed: Permission denied (in file-dotlock.c:195)
Jan 16 15:36:13 roundcube-internal-server-1 dovecot: 
imap(xyz)<361270><aqauu17ycsvAqL8/>: Error: unlink(xyz.lock) failed:
Permission denied (in file-dotlock.c:195)
Jan 16 15:36:13 roundcube-internal-server-1 dovecot: 
imap(xyz)<361270><aqauu17ycsvAqL8/>: Error: Mailbox INBOX: 
file_dotlock_create(xyz) in directory /var/mail failed: Permission 
denied (euid=10865(xyz) egid=8(mail) missing +w perm: /var/mail, UNIX 
perms appear ok (ACL/MAC wrong?), dir owned by 0:8 mode=0771)
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On Mon, Jan 16, 2023 at 1:34 PM manmatha <manmatha at isical.ac.in> wrote:
> Hi All,
>
> We are running Round cube on top of dovecot and postfix as our email echo
> system. Main problem we are facing is that, roundcube loads really slow for
> big inboxes (~5000 emails). I found that, while it loads, imap process goes
> high in terms of CPU utilization(~90%). I asked it in some roundcube
> support group, They believe that it is related to dovecot not roundcube.
> Can you shed any light on this issue. Thanks in advance.
>
> Here is $dovecot -n$ output
>
> xyz at roundcube-internal-server-1: <manmatha at
roundcube-internal-server-1:>/etc/dovecot$
> dovecot -n
> # 2.3.16 (7e2e900c1a): /etc/dovecot/dovecot.conf
> # Pigeonhole version 0.5.16 (09c29328)
> # OS: Linux 5.15.0-1024-kvm x86_64 Ubuntu 22.04.1 LTS
> # Hostname: roundcube-internal-server-1
> auth_mechanisms = plain login
> disable_plaintext_auth = no
> listen = *
> lock_method = dotlock
> mail_always_cache_fields = date.received
> mail_cache_min_mail_count = 5000
> mail_location = mbox:~/mail:INBOX=/var/mail/%u:INDEX=/var/indexes/
> isical.ac.in/%n
>
Yes. Please migrate from mbox to Maildir++ and you will not suffer from
those lock issues.


-- 
Best regards,
Odhiambo WASHINGTON,
Nairobi,KE
+254 7 3200 0004/+254 7 2274 3223
"Oh, the cruft.", egrep -v '^$|^.*#' ?\_(?)_/? :-)
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