JIT: don't leak shim memory when shutting down the interpreter

[diegorusso]

Address @brandtbucher comment here: #137961 (comment)

[markshannon]

Already reviewed internally.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x RHEL9 LTO + PGO 3.x (tier-3) has failed when building commit 450e836.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1578/builds/3788) and take a look at the build logs.
4. Check if the failure is related to this commit (450e836) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1578/builds/3788

Summary of the results of the build (if available):

Click to see traceback logs

remote: Enumerating objects: 8, done.        
remote: Counting objects:  16% (1/6)        
remote: Counting objects:  33% (2/6)        
remote: Counting objects:  50% (3/6)        
remote: Counting objects:  66% (4/6)        
remote: Counting objects:  83% (5/6)        
remote: Counting objects: 100% (6/6)        
remote: Counting objects: 100% (6/6), done.        
remote: Compressing objects:  50% (1/2)        
remote: Compressing objects: 100% (2/2)        
remote: Compressing objects: 100% (2/2), done.        
remote: Total 8 (delta 4), reused 4 (delta 4), pack-reused 2 (from 2)        
From https://github.com/python/cpython
 * branch                    main       -> FETCH_HEAD
Note: switching to '450e836aefd5973fb1ecc130dafa9055d122838f'.

You are in 'detached HEAD' state. You can look around, make experimental
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do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 450e836aefd JIT: don't leak shim memory when shutting down the interpreter (#142984)
Switched to and reset branch 'main'

find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
make[2]: [Makefile:3418: clean-retain-profile] Error 1 (ignored)
lto-wrapper: warning: using serial compilation of 4 LTRANS jobs
lto-wrapper: warning: using serial compilation of 4 LTRANS jobs
lto-wrapper: warning: using serial compilation of 6 LTRANS jobs
lto-wrapper: warning: using serial compilation of 2 LTRANS jobs
lto-wrapper: warning: using serial compilation of 4 LTRANS jobs
lto-wrapper: warning: using serial compilation of 3 LTRANS jobs
lto-wrapper: warning: using serial compilation of 3 LTRANS jobs
lto-wrapper: warning: using serial compilation of 3 LTRANS jobs
lto-wrapper: warning: using serial compilation of 2 LTRANS jobs
lto-wrapper: warning: using serial compilation of 2 LTRANS jobs
lto-wrapper: warning: using serial compilation of 7 LTRANS jobs
lto-wrapper: warning: using serial compilation of 4 LTRANS jobs
lto-wrapper: warning: using serial compilation of 3 LTRANS jobs
lto-wrapper: warning: using serial compilation of 2 LTRANS jobs
lto-wrapper: warning: using serial compilation of 3 LTRANS jobs
lto-wrapper: warning: using serial compilation of 128 LTRANS jobs
lto-wrapper: warning: using serial compilation of 6 LTRANS jobs
lto-wrapper: warning: using serial compilation of 2 LTRANS jobs
lto-wrapper: warning: using serial compilation of 128 LTRANS jobs
lto-wrapper: warning: using serial compilation of 128 LTRANS jobs
during IPA pass: profile
./Modules/posixmodule.c: In function ‘fill_time’:
./Modules/posixmodule.c:18824:1: internal compiler error: Segmentation fault
18824 | }
      | ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugzilla.redhat.com/bugzilla> for instructions.
Preprocessed source stored into /tmp/cc97Xxs7.out file, please attach this to your bugreport.
make[1]: *** [Makefile:3863: Modules/posixmodule.o] Error 1
make[1]: *** Waiting for unfinished jobs....
Python/ceval.c: In function ‘_Py_BuildMap_StackRefSteal’:
Python/ceval.c:1327:11: warning: ‘args_o_temp’ may be used uninitialized [-Wmaybe-uninitialized]
 1327 |     res = _PyDict_FromItems(
      |           ^~~~~~~~~~~~~~~~~~
 1328 |         args_o, 2,
      |         ~~~~~~~~~~
 1329 |         args_o+1, 2,
      |         ~~~~~~~~~~~~
 1330 |         half_args
      |         ~~~~~~~~~
 1331 |     );
      |     ~      
In file included from Python/ceval.c:13:
./Include/internal/pycore_dict.h:290:23: note: by argument 3 of type ‘struct PyObject * const *’ to ‘_PyDict_FromItems’ declared here
  290 | PyAPI_FUNC(PyObject *)_PyDict_FromItems(
      |                       ^~~~~~~~~~~~~~~~~
In file included from Python/ceval.c:1031:
Python/ceval.c:1322:52: note: ‘args_o_temp’ declared here
 1322 |     STACKREFS_TO_PYOBJECTS(arguments, half_args*2, args_o);
      |                                                    ^~~~~~
Python/ceval.c: In function ‘_PyCallMethodDescriptorFast_StackRefSteal’:
Python/ceval.c:1214:11: warning: ‘args_o_temp’ may be used uninitialized [-Wmaybe-uninitialized]
 1214 |     res = cfunc(self, (args_o + 1), total_args - 1);
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Python/ceval.c:1214:11: note: by argument 2 of type ‘struct PyObject * const *’ to ‘struct PyObject * <Td5d> (struct PyObject *, struct PyObject * const *, Py_ssize_t)’
In file included from Python/ceval.c:1031:
Python/ceval.c:1205:51: note: ‘args_o_temp’ declared here
 1205 |     STACKREFS_TO_PYOBJECTS(arguments, total_args, args_o);
      |                                                   ^~~~~~
Python/ceval.c:1214:11: warning: ‘_232’ may be used uninitialized [-Wmaybe-uninitialized]
 1214 |     res = cfunc(self, (args_o + 1), total_args - 1);
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Python/ceval.c:1214:11: note: by argument 2 of type ‘struct PyObject * const *’ to ‘struct PyObject * <Td5d> (struct PyObject *, struct PyObject * const *, Py_ssize_t)’
In file included from Python/ceval.c:1031:
Python/ceval.c:1205:51: note: ‘args_o_temp’ declared here
 1205 |     STACKREFS_TO_PYOBJECTS(arguments, total_args, args_o);
      |                                                   ^~~~~~
Python/ceval.c: In function ‘_PyCallMethodDescriptorFastWithKeywords_StackRefSteal’:
Python/ceval.c:1248:11: warning: ‘args_o_temp’ may be used uninitialized [-Wmaybe-uninitialized]
 1248 |     res = cfunc(self, (args_o + 1), total_args-1, NULL);
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Python/ceval.c:1248:11: note: by argument 2 of type ‘struct PyObject * const *’ to ‘struct PyObject * <Td63> (struct PyObject *, struct PyObject * const *, Py_ssize_t, struct PyObject *)’
In file included from Python/ceval.c:1031:
Python/ceval.c:1238:51: note: ‘args_o_temp’ declared here
 1238 |     STACKREFS_TO_PYOBJECTS(arguments, total_args, args_o);
      |                                                   ^~~~~~
Python/ceval.c:1248:11: warning: ‘_232’ may be used uninitialized [-Wmaybe-uninitialized]
 1248 |     res = cfunc(self, (args_o + 1), total_args-1, NULL);
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Python/ceval.c:1248:11: note: by argument 2 of type ‘struct PyObject * const *’ to ‘struct PyObject * <Td63> (struct PyObject *, struct PyObject * const *, Py_ssize_t, struct PyObject *)’
In file included from Python/ceval.c:1031:
Python/ceval.c:1238:51: note: ‘args_o_temp’ declared here
 1238 |     STACKREFS_TO_PYOBJECTS(arguments, total_args, args_o);
      |                                                   ^~~~~~
make: *** [Makefile:1041: profile-opt] Error 2