[FS#833] pppoe memory problem

[LEDE Bugs]

The following task has a new comment added:

FS#833 - pppoe memory problem
User who did this - olenchenko (olenchenko)

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I have the same issue when pppoe tries to reconnect using Linksys WRT1900ACS, LEDE Reboot 17.01.4 r3560-79f57e422d, Kernel Version	4.4.92.
echo 3> /proc/sys/vm/drop_caches does not help.

Yesterday my ISP had some major issues and my 1900ACS become unusable after ~45mins - I could not connect to it (web and SSH) and had to reboot it with power switch.

Is there a way to debug this problem?
This issue looks to me like a critical one.
Any advice?
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=833#comment3873