Why does / overlay fill?

Installing and Using OpenWrt
1

My modem has reached this level of completion after about 30 days in the / overlay section, about 89%
Why is this section being filled? And how to stop it? Because it creates problems after filling

Filesystem                Size      Used Available Use% Mounted on
/dev/root                11.3M     11.3M         0 100% /rom
tmpfs                    61.1M    640.0K     60.5M   1% /tmp
/dev/mtdblock6            2.9M      2.6M    320.0K  89% /overlay
overlayfs:/overlay        2.9M      2.6M    320.0K  89% /
tmpfs                   512.0K         0    512.0K   0% /dev
/dev/mtdblock7          320.0K    196.0K    124.0K  61% /noremove
2

If you installed any packages or you are adding files in the permanent storage, that will decrease the anyway small overlay amount of space.

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3

What should I do to solve this problem?

4

All files you create or delete after the installation (except temporary files that go to RAM) take some space from "/overlay". What modifications have you performed after the installation?

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5

After installation, a series of bash files are executed automatically and simple settings such as changing lan, etc. are performed.
A number of packages are also installed, such as snmpd and ..

6
  1. Remove the additional packages.
  2. Add extroot
  3. Change the router to a more beefy.
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7

If the space used increases offer the installation and configuration, perhaps some of the extra packages are writing to the internal flash memory.

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8 
du /overlay | sort -n
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9

Check the contents of /overlay/upper directory.
You should be able to identify, which files consume space.

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