[systemd-bugs] [Bug 71277] New: every boot hangs for ~20s at a random stage

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71277

          Priority: medium
            Bug ID: 71277
          Assignee: systemd-bugs at lists.freedesktop.org
           Summary: every boot hangs for ~20s at a random stage
        QA Contact: systemd-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: yzb3 at wp.pl
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: general
           Product: systemd

Recently I noticed that my boot has become much slower than before. I ran
systemd-analyze, which reports a silly value:

Startup finished in 584542y 2w 2d 20h 1min 44.604s (loader) + 2.007s (kernel) +
28.255s (userspace) = 30.262s

I tried to identify the culprit service by running systemd-analyze
critical-chain, but it hangs for around 20s at random stages of boot (this time
at sysinit.target, but on previous boot it was systemd-tmpfiles-setup.service,
sometimes it is timers.target or basic.target... you get the point):

multi-user.target @28.255s
└─systemd-logind.service @28.037s +217ms
  └─basic.target @28.036s
    └─timers.target @28.035s
      └─systemd-tmpfiles-clean.timer @28.035s
        └─sysinit.target @2.443s
          └─systemd-update-utmp.service @2.306s +136ms
            └─systemd-tmpfiles-setup.service @2.219s +87ms
              └─local-fs.target @2.218s
                └─home.mount @2.148s +70ms
                 
└─dev-disk-by\x2duuid-c26e6d9a\x2d0bbb\x2d436a\x2da217\x2d95c738b5b9c6.device
@2.148s

#journalctl -b also doesn't help, not even with the systemd debug kernel
parameter - the point at which the boot pauses for around 20s is random and
debug provides no additional [relevant] information.

systemd-analyze blame reports no service that would explain this pause:

           439ms systemd-udev-trigger.service
           434ms systemd-sysctl.service
           433ms systemd-vconsole-setup.service
           433ms sys-kernel-debug.mount
           217ms systemd-logind.service
           206ms kmod-static-nodes.service
           136ms systemd-update-utmp.service
            88ms sys-kernel-config.mount
            88ms dev-hugepages.mount
            87ms systemd-tmpfiles-setup.service
            86ms systemd-remount-fs.service
            86ms tmp.mount
            70ms home.mount
            54ms systemd-user-sessions.service
            46ms systemd-tmpfiles-setup-dev.service
            37ms user at 1000.service
            27ms systemd-backlight at acpi_video0.service
            20ms systemd-journal-flush.service
            17ms systemd-udevd.service
            15ms systemd-random-seed.service
             5ms dev-mqueue.mount
             5ms alsa-restore.service

Please advise whether I can provide any additional information that could help
resolve this.

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