Experimental Physics and
Industrial Control System

I think the assertion which is failing is at:

https://github.com/epics-base/epics-base/blob/3.14/src/db/dbNotify.c#L405

This code is involved with the CA put w/ callback operation.

The function dbNotifyCompletion() isn't called from many places in Base.

https://github.com/epics-base/epics-base/blob/3.14/src/db/dbAccess.c#L647

https://github.com/epics-base/epics-base/blob/3.14/src/db/recGbl.c#L259

In both places, the call is conditional on PPN!=NULL, which is what the
assert() is asserting.  So either dbNotifyCompletion() is being called
from some other code, or there is some memory corruption.

A stack trace should distinguish between these two possibilities.