[systemd-bugs] [Bug 90803] New: btrfs_subvol_snapshot() broken

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90803

            Bug ID: 90803
           Summary: btrfs_subvol_snapshot() broken
           Product: systemd
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: dh.herrmann at gmail.com
        QA Contact: systemd-bugs at lists.freedesktop.org

Created attachment 116211
  --> https://bugs.freedesktop.org/attachment.cgi?id=116211&action=edit
strace log

Hi

Running `systemd-nspawn -D / -xb` produces the following error for me:

  david at david-t2 ~/dev/systemd $ sudo ./systemd-nspawn -D / -xb
  Failed to create snapshot /.#a726c057b3fe24c6 from /: No such file or
directory

I tracked this down to btrfs_subvol_snapshot(), and subvol_snapshot_children()
in particular. If called with BTRFS_SNAPSHOT_RECURSIVE, it fails in the
recursion step.

My root system consists of the root snapshot at '/', and a btrfs snapshot at
'/var/lib/machines'. The strace output is attached.

Thanks
David

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