[systemd-bugs] [Bug 78337] New: journald can be very slow (on btrfs ?)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78337

          Priority: medium
            Bug ID: 78337
          Assignee: systemd-bugs at lists.freedesktop.org
           Summary: journald can be very slow (on btrfs ?)
        QA Contact: systemd-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: mildred-bug.freedesktop at mildred.fr
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: general
           Product: systemd

Created attachment 98555
  --> https://bugs.freedesktop.org/attachment.cgi?id=98555&action=edit
ls -l output

I used journald in both Fedora and ArchLinux, on a btrfs filesystem, and I
noticed on two occasions (once for each distribution) that journald can become
very slow, to the point where the boot proess is taking a very long time (more
than 10 minutes).

After getting a shell, I found that I couldn't access the log at all. Or it
took a very long time (a few minutes for `journalctl -fa`).

Removing (or moving away) all files in /var/log/journal fixed the problem and
the system was as fast as the first day.

I still have the old files for diagnosis if you want me to try something with
them.

Here is the output of --verify and --disk-usage

$ journalctl -D /var/log/journal/e92df66897d24a499a6b6ecf7e6a30c2- --disk-usage
Journals take up 4.0G on disk.

The output of --verify command (that was successful) and the list of files is
attached.

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