how to debug problem with "failing unmounting"

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Hi
On the soc on which I work there is issue with unmouting some partitions/directories during /sbin/reboot, here is some example:

[   OK   ]  Stopped target Local File System.
Unmouting Temporary Directory (/tmp)...
Unmouting /run/user/0... 
...
[   FAILED  ]  Failed unmouting Temporary Directory (/tmp).
[   FAILED  ]  Failed unmouting  /run/user/0. 
....

Unfortunately like it is typical in kernel information about why unmouting failed doesn't appear.  So seems like searching in darkness what is going on. Is any way how to search in darkness? Firstly I should make sure /tmp or /run/user/0 is really a partition and was mount at linux startup. Then maybe I should check access rights if it is rwx. What else can be tried here?
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