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[Bug 1444402] Re: While sbuilding, systemd loops attempting to umount the underlay

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These are going over the bus

signal sender=:1.0 -> dest=(null destination) serial=10268593 path=/org/freedesktop/systemd1/unit/var_2dlib_2dschroot_2dunion_2dunderlay_2dvivid_5cx2damd64_5cx2d422d4deb_5cx2d2a9d_5cx2d4364_5cx2dbba4_5cx2d04d126ec6cf2_2emount; interface=org.freedesktop.DBus.Properties; member=PropertiesChanged
   string "org.freedesktop.systemd1.Mount"
   array [
      dict entry(
         string "What"
         variant             string "/dev/disk/by-uuid/980689ca-e7d9-4a99-8230-33b8b6e917cd"
      )
      dict entry(
         string "Options"
         variant             string "rw,relatime,discard,errors=remount-ro,data=ordered"
      )
      dict entry(
         string "Type"
         variant             string "ext4"
      )
      dict entry(
         string "ControlPID"
         variant             uint32 0
      )
      dict entry(
         string "Result"
         variant             string "exit-code"
      )
   ]
   array [
      string "ExecMount"
      string "ExecUnmount"
      string "ExecRemount"
   ]
signal sender=:1.0 -> dest=(null destination) serial=10268594 path=/org/freedesktop/systemd1/unit/var_2dlib_2dschroot_2dunion_2dunderlay_2dvivid_5cx2damd64_5cx2d422d4deb_5cx2d2a9d_5cx2d4364_5cx2dbba4_5cx2d04d126ec6cf2_2emount; interface=org.freedesktop.DBus.Properties; member=PropertiesChanged
   string "org.freedesktop.systemd1.Unit"
   array [
      dict entry(
         string "ActiveState"
         variant             string "active"
      )
      dict entry(
         string "SubState"
         variant             string "mounted"
      )
      dict entry(
         string "InactiveExitTimestamp"
         variant             uint64 1429097554602566
      )
      dict entry(
         string "InactiveExitTimestampMonotonic"
         variant             uint64 10242667599
      )
      dict entry(
         string "ActiveEnterTimestamp"
         variant             uint64 1429097829298497
      )
      dict entry(
         string "ActiveEnterTimestampMonotonic"
         variant             uint64 10517363530
      )
      dict entry(
         string "ActiveExitTimestamp"
         variant             uint64 1429097829292302
      )
      dict entry(
         string "ActiveExitTimestampMonotonic"
         variant             uint64 10517357335
      )
      dict entry(
         string "InactiveEnterTimestamp"
         variant             uint64 0
      )
      dict entry(
         string "InactiveEnterTimestampMonotonic"
         variant             uint64 0
      )
      dict entry(
         string "Job"
         variant             struct {
               uint32 1467033
               object path "/org/freedesktop/systemd1/job/1467033"
            }
      )
      dict entry(
         string "ConditionResult"
         variant             boolean false
      )
      dict entry(
         string "AssertResult"
         variant             boolean false
      )
      dict entry(
         string "ConditionTimestamp"
         variant             uint64 0
      )
      dict entry(
         string "ConditionTimestampMonotonic"
         variant             uint64 0
      )
      dict entry(
         string "AssertTimestamp"
         variant             uint64 0
      )
      dict entry(
         string "AssertTimestampMonotonic"
         variant             uint64 0
      )
   ]
   array [
   ]
signal sender=:1.0 -> dest=(null destination) serial=10268595 path=/org/freedesktop/systemd1; interface=org.freedesktop.systemd1.Manager; member=JobNew
   uint32 1467033
   object path "/org/freedesktop/systemd1/job/1467033"
   string "var-lib-schroot-union-underlay-vivid\x2damd64\x2d422d4deb\x2d2a9d\x2d4364\x2dbba4\x2d04d126ec6cf2.mount"
signal sender=:1.0 -> dest=(null destination) serial=10268596 path=/org/freedesktop/systemd1/unit/var_2dlib_2dschroot_2dunion_2dunderlay_2dvivid_5cx2damd64_5cx2d422d4deb_5cx2d2a9d_5cx2d4364_5cx2dbba4_5cx2d04d126ec6cf2_2emount; interface=org.freedesktop.DBus.Properties; member=PropertiesChanged
   string "org.freedesktop.systemd1.Mount"
   array [
      dict entry(
         string "What"
         variant             string "/dev/disk/by-uuid/980689ca-e7d9-4a99-8230-33b8b6e917cd"
      )
      dict entry(
         string "Options"
         variant             string "rw,relatime,discard,errors=remount-ro,data=ordered"
      )
      dict entry(
         string "Type"
         variant             string "ext4"
      )
      dict entry(
         string "ControlPID"
         variant             uint32 6235
      )
      dict entry(
         string "Result"
         variant             string "exit-code"
      )
   ]
   array [
      string "ExecMount"
      string "ExecUnmount"
      string "ExecRemount"
   ]
signal sender=:1.0 -> dest=(null destination) serial=10268597 path=/org/freedesktop/systemd1/unit/var_2dlib_2dschroot_2dunion_2dunderlay_2dvivid_5cx2damd64_5cx2d422d4deb_5cx2d2a9d_5cx2d4364_5cx2dbba4_5cx2d04d126ec6cf2_2emount; interface=org.freedesktop.DBus.Properties; member=PropertiesChanged
   string "org.freedesktop.systemd1.Unit"
   array [
      dict entry(
         string "ActiveState"
         variant             string "deactivating"
      )
      dict entry(
         string "SubState"
         variant             string "unmounting"
      )
      dict entry(
         string "InactiveExitTimestamp"
         variant             uint64 1429097554602566
      )
      dict entry(
         string "InactiveExitTimestampMonotonic"
         variant             uint64 10242667599
      )
      dict entry(
         string "ActiveEnterTimestamp"
         variant             uint64 1429097829298497
      )
      dict entry(
         string "ActiveEnterTimestampMonotonic"
         variant             uint64 10517363530
      )
      dict entry(
         string "ActiveExitTimestamp"
         variant             uint64 1429097829298992
      )
      dict entry(
         string "ActiveExitTimestampMonotonic"
         variant             uint64 10517364025
      )
      dict entry(
         string "InactiveEnterTimestamp"
         variant             uint64 0
      )
      dict entry(
         string "InactiveEnterTimestampMonotonic"
         variant             uint64 0
      )
      dict entry(
         string "Job"
         variant             struct {
               uint32 1467033
               object path "/org/freedesktop/systemd1/job/1467033"
            }
      )
      dict entry(
         string "ConditionResult"
         variant             boolean false
      )
      dict entry(
         string "AssertResult"
         variant             boolean false
      )
      dict entry(
         string "ConditionTimestamp"
         variant             uint64 0
      )
      dict entry(
         string "ConditionTimestampMonotonic"
         variant             uint64 0
      )
      dict entry(
         string "AssertTimestamp"
         variant             uint64 0
      )
      dict entry(
         string "AssertTimestampMonotonic"
         variant             uint64 0
      )
   ]
   array [
   ]
signal sender=:1.0 -> dest=(null destination) serial=10268598 path=/org/freedesktop/systemd1/job/1467033; interface=org.freedesktop.DBus.Properties; member=PropertiesChanged
   string "org.freedesktop.systemd1.Job"
   array [
      dict entry(
         string "State"
         variant             string "running"
      )
   ]
   array [
   ]
signal sender=:1.0 -> dest=(null destination) serial=10268599 path=/org/freedesktop/systemd1; interface=org.freedesktop.systemd1.Manager; member=JobRemoved
   uint32 1467033
   object path "/org/freedesktop/systemd1/job/1467033"
   string "var-lib-schroot-union-underlay-vivid\x2damd64\x2d422d4deb\x2d2a9d\x2d4364\x2dbba4\x2d04d126ec6cf2.mount"
   string "failed"

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https://bugs.launchpad.net/bugs/1444402

Title:
  While sbuilding, systemd loops attempting to umount the underlay

Status in systemd package in Ubuntu:
  New

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?

  laney@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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References

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