[Bug 1804603] Re: systemd-tmpfiles-setup.service fails on btrfs

[Dimitri John Ledkov]

** Description changed:

- After update to systemd 237-3ubuntu10.9 systemd-tmpfiles-setup.service
- fails with:
+ [Impact]
+ 
+  * Last security update introduced a regression on btrfs based systems, causing systemd-tmpfiles-setup.service to fail to start, resulting in degraded machines.
+  * Cherrypick upstream fixes to resolve this.
+ 
+ [Test Case]
+ 
+  * Install VM using btrfs for /
+  * Boot, check that systemd-tmpfiles-setup.service is started successfully with:
+ $ systemctl status systemd-tmpfiles-setup.service
+ 
+ [Regression Potential]
+ 
+  * btrfs fd doesn't support the set of flags that systemd used, with
+ this patch, a compat set of flags is set instead, thus resolving the
+ introduced regression. The worst case scenario is that creating
+ subvolumes/directories is still broken (as in, the current status quo).
+ 
+ [Other Info]
+  
+  * Example bad output
+ 
+ 
+ After update to systemd 237-3ubuntu10.9 systemd-tmpfiles-setup.service fails with:
  
  Nov 21 13:44:12 node-blc49 systemd[1]: Starting Create Volatile Files and Directories...
  Nov 21 13:44:12 node-blc49 systemd-tmpfiles[1226]: Failed to create directory or subvolume "/var": Bad file descriptor
  Nov 21 13:44:12 node-blc49 systemd-tmpfiles[1226]: Failed to create directory or subvolume "/home": Bad file descriptor
  Nov 21 13:44:12 node-blc49 systemd-tmpfiles[1226]: Failed to create directory or subvolume "/srv": Bad file descriptor
  Nov 21 13:44:12 node-blc49 systemd[1]: systemd-tmpfiles-setup.service: Main process exited, code=exited, status=1/FAILURE
  Nov 21 13:44:12 node-blc49 systemd[1]: systemd-tmpfiles-setup.service: Failed with result 'exit-code'.
  Nov 21 13:44:12 node-blc49 systemd[1]: Failed to start Create Volatile Files and Directories.
  
  This happens on btrfs root filesystems in real hardware and on our
  virtualized servers as well. 237-3ubuntu10.6 didnt show this errors and
  going back to 237-3ubuntu10 removes them as well.
  
  # lsb_release -rd
  Description:    Ubuntu 18.04.1 LTS
  Release:        18.04
  
  # apt-cache policy systemd
  systemd:
-   Installiert:           237-3ubuntu10.9
-   Installationskandidat: 237-3ubuntu10.9
-   Versionstabelle:
-  *** 237-3ubuntu10.9 500
-         500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
-         500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
-         100 /var/lib/dpkg/status
-      237-3ubuntu10 500
-         500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
+   Installiert:           237-3ubuntu10.9
+   Installationskandidat: 237-3ubuntu10.9
+   Versionstabelle:
+  *** 237-3ubuntu10.9 500
+         500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
+         500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
+         100 /var/lib/dpkg/status
+      237-3ubuntu10 500
+         500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

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https://bugs.launchpad.net/bugs/1804603

Title:
  systemd-tmpfiles-setup.service fails on btrfs

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  New
Status in systemd source package in Cosmic:
  In Progress
Status in systemd source package in Disco:
  Fix Released

Bug description:
  [Impact]

   * Last security update introduced a regression on btrfs based systems, causing systemd-tmpfiles-setup.service to fail to start, resulting in degraded machines.
   * Cherrypick upstream fixes to resolve this.

  [Test Case]

   * Install VM using btrfs for /
   * Boot, check that systemd-tmpfiles-setup.service is started successfully with:
  $ systemctl status systemd-tmpfiles-setup.service

  [Regression Potential]

   * btrfs fd doesn't support the set of flags that systemd used, with
  this patch, a compat set of flags is set instead, thus resolving the
  introduced regression. The worst case scenario is that creating
  subvolumes/directories is still broken (as in, the current status
  quo).

  [Other Info]
   
   * Example bad output

  
  After update to systemd 237-3ubuntu10.9 systemd-tmpfiles-setup.service fails with:

  Nov 21 13:44:12 node-blc49 systemd[1]: Starting Create Volatile Files and Directories...
  Nov 21 13:44:12 node-blc49 systemd-tmpfiles[1226]: Failed to create directory or subvolume "/var": Bad file descriptor
  Nov 21 13:44:12 node-blc49 systemd-tmpfiles[1226]: Failed to create directory or subvolume "/home": Bad file descriptor
  Nov 21 13:44:12 node-blc49 systemd-tmpfiles[1226]: Failed to create directory or subvolume "/srv": Bad file descriptor
  Nov 21 13:44:12 node-blc49 systemd[1]: systemd-tmpfiles-setup.service: Main process exited, code=exited, status=1/FAILURE
  Nov 21 13:44:12 node-blc49 systemd[1]: systemd-tmpfiles-setup.service: Failed with result 'exit-code'.
  Nov 21 13:44:12 node-blc49 systemd[1]: Failed to start Create Volatile Files and Directories.

  This happens on btrfs root filesystems in real hardware and on our
  virtualized servers as well. 237-3ubuntu10.6 didnt show this errors
  and going back to 237-3ubuntu10 removes them as well.

  # lsb_release -rd
  Description:    Ubuntu 18.04.1 LTS
  Release:        18.04

  # apt-cache policy systemd
  systemd:
    Installiert:           237-3ubuntu10.9
    Installationskandidat: 237-3ubuntu10.9
    Versionstabelle:
   *** 237-3ubuntu10.9 500
          500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
          100 /var/lib/dpkg/status
       237-3ubuntu10 500
          500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

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