[Bug 1301451] Re: System doesn't start correct if it has a separate /usr filesystem

[Quinn Balazs]

Systemd (through the auspices of the linux system itself) require that
/usr be present and mounted by the time it is started. The easiest way
to circumvent this issue (other than just moving /usr back to the
rootfs) is to create an initramfs that essentially will hide from the
system that /usr is split off and not pre-mounted. Systemd isn't the
issue here, there isn't a way to reliably bring up a modern system with
an empty /usr. There is little hope that this will be supported so your
best bet will be creating an initramfs that will mount /usr on top of /
before init is started. See http://freedesktop.org/wiki/Software/systemd
/separate-usr-is-broken/ for some more information on this issue and the
reasons its pretty unlikely to be fixed. Going to set this as affecting
systemd and wait for someone else to make the call on whether this
really constitutes a bug.

** Package changed: ubuntu => systemd (Ubuntu)

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Title:
  System doesn't start correct if it has a separate /usr filesystem

Status in “systemd” package in Ubuntu:
  New

Bug description:
  Hi! I use Ubuntu 14.04 testing

  My problem: System doesn't start after reboot, It don't mount all
  filesystems

  crashbit at crashbit-Dell-System-XPS-L321X:~$ lsb_release -rd
  Description:	Ubuntu Trusty Tahr (development branch)
  Release:	14.04

  I update the system and restart it every time, today I see an updates of systemd, udev and kernel.
  When the process ends I restart the system, but it don't mount all filesystems.

  My configuration:
  crashbit at crashbit-Dell-System-XPS-L321X:~$ lsblk
  NAME                  MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
  sda                     8:0    0 238,5G  0 disk
  ├─sda1                  8:1    0   3,7G  0 part
  │ └─sda1_crypt (dm-0) 252:0    0   3,7G  0 crypt [SWAP]
  ├─sda2                  8:2    0     1K  0 part
  ├─sda5                  8:5    0   7,5G  0 part  /
  ├─sda6                  8:6    0   428M  0 part  /boot
  ├─sda7                  8:7    0  24,2G  0 part  /usr
  └─sda8                  8:8    0 202,7G  0 part
    └─sda8_crypt (dm-1) 252:1    0 202,7G  0 crypt

  /dev/sda5                on  /                         type  ext4             (rw,errors=remount-ro)
  proc                     on  /proc                     type  proc             (rw,noexec,nosuid,nodev)
  sysfs                    on  /sys                      type  sysfs            (rw,noexec,nosuid,nodev)
  none                     on  /sys/fs/cgroup            type  tmpfs            (rw)
  none                     on  /sys/fs/fuse/connections  type  fusectl          (rw)
  none                     on  /sys/kernel/debug         type  debugfs          (rw)
  none                     on  /sys/kernel/security      type  securityfs       (rw)
  udev                     on  /dev                      type  devtmpfs         (rw,mode=0755)
  devpts                   on  /dev/pts                  type  devpts           (rw,noexec,nosuid,gid=5,mode=0620)
  tmpfs                    on  /run                      type  tmpfs            (rw,noexec,nosuid,size=10%,mode=0755)
  none                     on  /run/lock                 type  tmpfs            (rw,noexec,nosuid,nodev,size=5242880)
  none                     on  /run/shm                  type  tmpfs            (rw,nosuid,nodev)
  none                     on  /run/user                 type  tmpfs            (rw,noexec,nosuid,nodev,size=104857600,mode=0755)
  none                     on  /sys/fs/pstore            type  pstore           (rw)
  cgroup                   on  /sys/fs/cgroup/cpuset     type  cgroup           (rw,relatime,cpuset)
  cgroup                   on  /sys/fs/cgroup/cpu        type  cgroup           (rw,relatime,cpu)
  /dev/sda6                on  /boot                     type  ext2             (rw)
  /dev/sda7                on /usr                         type  btrfs            (rw)
  /dev/mapper/sda8_crypt   on  /home                     type  btrfs            (rw,subvol=@home)
  systemd                  on  /sys/fs/cgroup/systemd    type  cgroup           (rw,noexec,nosuid,nodev,none,name=systemd)
  /home/crashbit/.Private  on  /home/crashbit            type  ecryptfs         (ecryptfs_check_dev_ruid,ecryptfs_cipher=aes,ecryptfs_key_bytes=16,ecryptfs_unlink_sigs,ecryptfs_sig=XXXXXXXXXX,ecryptfs_fnek_sig=XXXXXXXXXXXXX)
  gvfsd-fuse               on  /run/user/1000/gvfs       type  fuse.gvfsd-fuse  (rw,nosuid,nodev,user=crashbit)

  Normally the system starts perfect, but after this upgrades the system doesn't start.
  I try tu reboot in recovery mode and moun manually /usr partition, but if I do it, the system does not starts correctly.

  I've also tried to start with an old kernel, but does not work

  Finally I moved  all files of /usr partition tu root partition and rename it, and system starts correctly.
  I think it happens becouse I have a separated /usr partition, but I don't know how package creates this problem.

  Sorry for my bad English

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