Valgrind - showing memory leaks?

Hi Hackers,

I ran a postgres server with valgrind looking for memory leaks at a
particular extension, but I am experiencing something strange. Here are the
steps:

1. PG configured & compile as follows:
---------------------------------------------------
$ ./configure --enable-debug CFLAGS="-ggdb -Og -g3 -fno-omit-frame-pointer"
--enable-cassert \
--enable-rpath --enable-tap-tests --with-ssl=openssl --with-systemd
--enable-depend \
--enable-injection-points --with-liburing --enable-dtrace --prefix=/tmp/pg18
$ make install

2. In terminal-1, PG Server launched as follows:
----------------------------------------------------------------
$ valgrind --leak-check=full --gen-suppressions=all
--suppressions=postgres/src/tools/valgrind.supp \
--time-stamp=yes
--error-markers=VALGRINDERROR-BEGIN,VALGRINDERROR-END
--log-file=/valgrind_%p.log
\
--trace-children=yes /tmp/pg18/bin/postgres -D /tmp/data1
--log_line_prefix="%m %p " \
--log_statement=all --shared_buffers=64MB 2>&1 | tee
/tmp/valgrind_postmaster.log

3. In terminal-2, psql launched as follows:
-------------------------------------------------------
$ /tmp/pg18/bin/psql postgres
psql (18devel)
Type "help" for help.

postgres=# select pg_backend_pid();
pg_backend_pid
----------------
2293900
(1 row)

postgres=# CREATE TABLE tbl1 (scope text NOT NULL);
CREATE TABLE
postgres=# INSERT INTO tbl1 VALUES ('some'),('full');
INSERT 0 2
postgres=# select * from tbl1;
scope
-------
some
full
(2 rows)

postgres=# drop table tbl1;
DROP TABLE
postgres=# \q

Attached is valgrind output generated showing memory leaks.

5. Question:
----------------
I believe that the valgrind should not report any memory leaks in such
simple/common commands. What am I doing wrong here?

Regards,

Yasir Hussain
Data Bene