I'm noticing a disbalance in function__entry and function__return static marker hits.  Python comes with systemtap static markers as described in [1]. The following is a demonstration how the function__return marker is hit, while the respective function__entry marker is not.  Let's have a simple python script:

$ cat test.py 
import random
print(random.random())
$ 

The following is a demonstration how certain function__return markers are hit:

$ cat gdb.cmds 
# run program so that all .SO's load and so do the static markers
r
# list avail static markers
info probes stap python
# print the 1st marker argument (filename) each time the static marker is hit:
b -probe-stap function__return
commands 1
p (char*)$_probe_arg0
c
end
r
$ gdb --command=gdb.cmds --batch --args python3 ./test.py | grep -F random
$2944 = 0x7ffff74e9780 "/usr/lib64/python3.11/random.py"
$2945 = 0x7ffff74e9780 "/usr/lib64/python3.11/random.py"
$2946 = 0x7ffff74e9780 "/usr/lib64/python3.11/random.py"
$2947 = 0x7ffff74e9780 "/usr/lib64/python3.11/random.py"
$2948 = 0x7ffff74e9780 "/usr/lib64/python3.11/random.py"
$2949 = 0x7ffff74e9780 "/usr/lib64/python3.11/random.py"
$ 

Now let's modify our gdb.cmds file so that function__entry markers are being monitored instead of function__return markers:

$ cat gdb.cmds 
# run program so that all .SO's load and so do the static markers
r
# list avail static markers
info probes stap python
# print the 1st marker argument (filename) each time the static marker is hit:
b -probe-stap function__entry
commands 1
p (char*)$_probe_arg0
c
end
r
$ gdb --command=gdb.cmds --batch --args python3 ./test.py | grep -F random
$ 


No hit at all.  That said, if the function return marker is hit, the respective entry marker should be hit as well.  So this is the reported disbalance.  Please investigate.  Also note that with python2.7-2.7.18-27.fc38.x86_64 there is no disbalance. 

The reported problem happens with python3-3.11.1-1.fc38.x86_64 and gdb-12.1-9.fc38.x86_64.  It can also be observed using systemtap instead of gdb, as shown in [2].

------------
[1] https://github.com/python/cpython/blob/main/Doc/howto/instrumentation.rst
[2] https://sourceware.org/bugzilla/show_bug.cgi?id=29832