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[Bug 1011053] Rebooting takes a long time because dmeventd refuses to exit (LVM thin volume)
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Mon, 09 Jan 2017 17:56:28 +0000
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--- Comment #7 from Thiago Macieira <thiago@xxxxxxx> ---
(In reply to zhen ren from comment #6)

I can replicate this locally now;-)

I can confirm that the message "WARNING: There are still devices being
monitored." comes from dmeventd (the string is in the /usr/sbin/dmeventd
executable). I can confirm that the dmeventd process is running after boot.
And yet:

According to "man dmeventd", it will be started to run when
mirror/raid/snapshot/thin feature(s) is/are used. In your case, it's "thin
pool" - system-pool0-tpool being monitored. The time when we create/activate
a thin pool is good chance to start this deamon, which can be done within
the code of LVM tools' commands.

Enabling the "dm-event.service" explicitly works for me. Could you have a

# systemctl enable dm-event.service
Created symlink from /etc/systemd/system/
to /usr/lib/systemd/system/dm-event.service.

It's enabled now. I'll let you know after my next reboot how it goes (shouldn't
take long, this machine crashes on suspend and on hibernate very often).

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