[systemd-bugs] [Bug 70856] New: PrivateTmp works incorrectly with `mount --make-rprivate /`

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70856

          Priority: medium
            Bug ID: 70856
          Assignee: systemd-bugs at lists.freedesktop.org
           Summary: PrivateTmp works incorrectly with `mount
                    --make-rprivate /`
        QA Contact: systemd-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: s.seletskiy at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: general
           Product: systemd

# dd if=/dev/zero of=/tmp/test-drive bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.0437981 s, 2.4 GB/s

# mkfs.ext4 /tmp/test-drive 
mke2fs 1.42.8 (20-Jun-2013)
/tmp/test-drive is not a block special device.
Proceed anyway? (y,n) y
Discarding device blocks: done                            
Filesystem label=
OS type: Linux
...

# systemctl stop ntpd

# mount /tmp/test-drive /mnt

# systemctl start ntpd

# umount /mnt

# grep loop /proc/*/mounts | wc -l
0

# systemctl stop ntpd

# mount --make-rprivate /

# mount /tmp/test-drive /mnt

# systemctl start ntpd

# umount /mnt 

# grep loop /proc/*/mounts | wc -l
1

# grep loop /proc/*/mounts
/proc/1411/mounts:/dev/loop0 /mnt ext4 rw,relatime,data=ordered 0 0

# pgrep -af ntpd
1411 /usr/bin/ntpd -g -u ntp:ntp

# systemctl show ntpd | grep Fragme
FragmentPath=/usr/lib/systemd/system/ntpd.service

# grep Priva /usr/lib/systemd/system/ntpd.service
PrivateTmp=true


As you can see, umounting wouldn't work on unit that was started with
PrivateTmp.

This bug is very annoying while using ZFS On Linux, because it stops umounted
dataset to be destroyed ("dataset is busy").

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/systemd-bugs/attachments/20131025/a9c1fd1d/attachment.html>