Unmounting /media/usb fails during shutdown if udev is running

Attachments show two cases:

unmounting_with-udev: udev (and udev-trigger) was previously started in the sysinit runlevel.
unmounting_without-udev: udev (and udev-trigger) was stopped before shutdown.

Installed udev packages:

udev-init-scripts-32-r2
udev-init-scripts-openrc-32-r2
eudev-libs-3.2.7-r0
eudev-3.2.7-r0

/proc/mounts: https://pastebin.com/hzvQirkg

(from redmine: issue id 10525, created on 2019-05-31)

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