Re: BUG #16707: Memory leak

PG Bug reporting form <noreply@postgresql.org> writes:
> It seems that since I switched from PostgreSQL 9.5 to 12, I started to have
> a memory leak.

Could you maybe collect a memory map from one of the bloated processes?
It'd go something like

* attach to process with gdb

* "call MemoryContextStats(TopMemoryContext)"

* quit gdb

* look in postmaster log for memory dump

You probably need to have debug symbols installed for step 2 to work.

            regards, tom lane