[Bug 1444402] Re: LXC with r/w sys and udev keeps trying to unmount bind mounts

Wed Jun 10 18:21:30 UTC 2015

This bug was fixed in the package systemd - 219-7ubuntu6

---------------
systemd (219-7ubuntu6) vivid; urgency=medium

  * Fix assertion crash with empty Exec*= paths. (LP: #1454173)
  * systemd-fsckd autopkgtest: Stop assuming that
    /etc/default/grub.d/90-autopkgtest.cfg exists.
  * systemd-fsckd autopkgtest: Add missing plymouth test dependency.
  * debian/tests/boot-smoke: Allow 10 seconds for systemd jobs to settle down.
  * Fix "tentative" state of devices which are not in /dev (mostly in
    containers), and avoid overzealous cleanup unmounting of mounts from them.
    (LP: #1444402)
  * journal: Gracefully handle failure to bind to audit socket, which is known
    to fail in namespaces (containers) with current kernels. Also
    conditionalize systemd-journald-audit.socket on CAP_AUDIT_READ.
    (LP: #1457054)
  * Add sigpwr-container-shutdown.service: Power off when receiving SIGPWR in
    a container. This makes lxc-stop work for systemd containers.
    (LP: #1457321)

 -- Martin Pitt <martin.pitt at ubuntu.com>  Thu, 21 May 2015 14:47:46
+0200

** Changed in: systemd (Ubuntu Vivid)
       Status: Fix Committed => Fix Released

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Title:
  LXC with r/w sys and udev keeps trying to unmount bind mounts

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Vivid:
  Fix Released

Bug description:
  I recently hit ENOSPC which turned out to be the result of various
  syslogs from the current and previous boots totalling up to 30G.

  They were filled with messages like

  Apr 15 11:22:35 vivid systemd[1]: Unit var-lib-schroot-union-underlay-vivid\x2damd64\x2d5d4f7453\x2d9a95\x2d4a6a\x2d9aee\x2d9394923bf734.mount is bound to inactive unit dev-disk-by\x2duuid-980689ca\x2de7d9\x2d4a99\x2d8230\x2d33b8b6e917cd.device. Stopping, too.
  Apr 15 11:22:35 vivid systemd[1]: Unmounting /var/lib/schroot/union/underlay/vivid-amd64-5d4f7453-9a95-4a6a-9aee-9394923bf734...
  Apr 15 11:22:35 vivid umount[31795]: umount: /var/lib/schroot/union/underlay/vivid-amd64-5d4f7453-9a95-4a6a-9aee-9394923bf734: target is busy
  Apr 15 11:22:35 vivid umount[31795]: (In some cases useful info about processes that
  Apr 15 11:22:35 vivid umount[31795]: use the device is found by lsof(8) or fuser(1).)
  Apr 15 11:22:35 vivid systemd[1]: var-lib-schroot-union-underlay-vivid\x2damd64\x2d5d4f7453\x2d9a95\x2d4a6a\x2d9aee\x2d9394923bf734.mount mount process exited, code=exited status=32
  Apr 15 11:22:35 vivid systemd[1]: Failed unmounting /var/lib/schroot/union/underlay/vivid-amd64-5d4f7453-9a95-4a6a-9aee-9394923bf734.
  Apr 15 11:22:35 vivid systemd[1]: Unit var-lib-schroot-union-underlay-vivid\x2damd64\x2d5d4f7453\x2d9a95\x2d4a6a\x2d9aee\x2d9394923bf734.mount is bound to inactive unit dev-disk-by\x2duuid-980689ca\x2de7d9\x2d4a99\x2d8230\x2d33b8b6e917cd.device. Stopping, too.
  Apr 15 11:22:35 vivid systemd[1]: Unmounting /var/lib/schroot/union/underlay/vivid-amd64-5d4f7453-9a95-4a6a-9aee-9394923bf734...
  Apr 15 11:22:35 vivid systemd[1]: Unmounted /var/lib/schroot/union/underlay/vivid-amd64-5d4f7453-9a95-4a6a-9aee-9394923bf734.
  Apr 15 11:22:35 vivid systemd[1]: Unit var-lib-schroot-union-underlay-vivid\x2damd64\x2d5d4f7453\x2d9a95\x2d4a6a\x2d9aee\x2d9394923bf734.mount entered failed state.

  looping constantly for the duration of any builds in sbuild.

  Why is systemd trying to do this?

  SRU TEST CASE:
  --------------
   - Create a vivid container, and set "lxc.aa_profile = unconfined" and "lxc.mount.auto = sys:rw cgroup" in its config. (Note that the latter is not supported!)
   - Start the container
   - Run "mount -v -o bind /bin /mnt"
   - Observe that it doesn't stay mounted, but "sudo journalctl" says

  Mai 06 09:17:08 test systemd[1]: Unit mnt.mount is bound to inactive unit dev-sda3.device. Stopping, too.
  Mai 06 09:17:08 test systemd[1]: Unmounting /mnt...
  Mai 06 09:17:08 test systemd[1]: Unmounted /mnt.

   - With the fixed package bind mounts stay mounted.

  REGRESSION POTENTIAL: This could potentially break cleanup of stale
  mount points of either hotplug devices which disappear, or media which
  get forcefully ejected (like CDs). Testing should include that these
  still work.

  laney at vivid> apt-cache policy systemd
  systemd:
    Installed: 219-7ubuntu1
    Candidate: 219-7ubuntu1
    Version table:
   *** 219-7ubuntu1 0
          500 http://sherwood/ubuntu/ vivid/main amd64 Packages
          100 /var/lib/dpkg/status

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