Public bug reported:

Dovecot errors in log:
Feb  8 10:25:26 tesla dovecot: imap(u...@example.com): Error: 
chdir(/home/vmail/example.com/user) failed: No such file or directory
Feb  8 10:25:26 tesla dovecot: imap(u...@example.com): Debug: Effective 
uid=5000, gid=5000, home=/home/vmail/example.com/user, 
chroot=/var/tmp/vmail_chroot/
Feb  8 10:25:26 tesla dovecot: imap(u...@example.com): Debug: Home dir not 
found: /home/vmail/example.com/user
Feb  8 10:25:26 tesla dovecot: imap(u...@example.com): Debug: Namespace inbox: 
type=private, prefix=, sep=, inbox=no, hidden=no, list=yes, subscriptions=yes 
location=maildir:~/Maildir:LAYOUT=fs
Feb  8 10:25:26 tesla dovecot: imap(u...@example.com): Debug: fs: 
root=/home/vmail/example.com/user/Maildir, index=, indexpvt=, control=, inbox=, 
alt=
Feb  8 10:25:26 tesla dovecot: imap(u...@example.com): Debug: Namespace : 
/home/vmail/example.com/user/Maildir doesn't exist yet, using default 
permissions
Feb  8 10:25:26 tesla dovecot: imap(u...@example.com): Debug: Namespace : Using 
permissions from /home/vmail/example.com/user/Maildir: mode=0700 gid=default
Feb  8 10:25:26 tesla dovecot: imap(u...@example.com): Error: user 
u...@example.com: Initialization failed: Namespace '': 
mkdir(/home/vmail/example.com/user/Maildir) failed: Permission denied 
(euid=5000(<getpwuid() error>) egid=50
00(<getgrgid() error>))
Feb  8 10:25:26 tesla dovecot: imap(u...@example.com): Error: Invalid user 
settings. Refer to server log for more information.

Home dir /home/vmail/example.com/user exists and vmail user can cd to
that directory. This error appears no matter what I permissions set,
even on 777.

Dovecot config below:
# 2.2.9: /etc/dovecot/dovecot.conf
# OS: Linux 3.13.0-55-generic x86_64 Ubuntu 14.04.3 LTS 
auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = login digest-md5 cram-md5
auth_verbose = yes
first_valid_gid = 5000
first_valid_uid = 5000
last_valid_gid = 5000
last_valid_uid = 5000
mail_chroot = /var/tmp/vmail_chroot/
mail_debug = yes
mail_home = /home/vmail/%d/%n
mail_location = maildir:~/Maildir:LAYOUT=fs
mailbox_list_index = yes
namespace inbox {
  location = 
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix = 
}
passdb {
  args = scheme=CRYPT username_format=%u /etc/dovecot/users
  driver = passwd-file
}
plugin {
  quota_rule = *:storage=100M
}
protocols = " imap lmtp pop3"
service auth-worker {
  user = $default_internal_user
}
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0666
    user = postfix
  }
}
service imap-login {
  inet_listener imap {
    port = 0
  }
  inet_listener imaps {
    port = 993
    ssl = yes
  }
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
}
service pop3-login {
  inet_listener pop3 {
    port = 0
  }
  inet_listener pop3s {
    port = 995
    ssl = yes
  }
}
ssl_cert = </etc/ssl/certs/x.example.com.pem
ssl_key = </etc/ssl/private/example.com.key
ssl_protocols = !SSLv2 !SSLv3
userdb {
  args = username_format=%u /etc/dovecot/users
  driver = passwd-file
}

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: dovecot-imapd 1:2.2.9-1ubuntu2.1
ProcVersionSignature: Ubuntu 3.13.0-55.94-generic 3.13.11-ckt20
Uname: Linux 3.13.0-55-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
Date: Mon Feb  8 10:26:45 2016
SourcePackage: dovecot
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: dovecot (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dovecot trusty

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https://bugs.launchpad.net/bugs/1543032

Title:
  Dovecot doesn't see user home dir

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