gh-122311: Add more tests for pickle (lenient)

[serhiy-storchaka]

• Issue: Add more tests for pickle and fix error messages #122311

[miss-islington-app]

Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.12, 3.13.
🐍🍒⛏🤖

[miss-islington-app]

Sorry, @serhiy-storchaka, I could not cleanly backport this to 3.12 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker bc93923a2dee00751e44da58b6967c63e3f5c392 3.12

[bedevere-app]

GH-122377 is a backport of this pull request to the 3.13 branch.

[bedevere-app]

GH-122378 is a backport of this pull request to the 3.12 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot ARM64 MacOS M1 Refleaks NoGIL 3.x has failed when building commit bc93923.

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/1368/builds/1511) and take a look at the build logs.
4. Check if the failure is related to this commit (bc93923) 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/1368/builds/1511

Failed tests:

• test_pickle

Test leaking resources:

• test_pickle: memory blocks
• test_pickle: references

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

==

Click to see traceback logs

remote: Enumerating objects: 11, done.        
remote: Counting objects:   9% (1/11)        
remote: Counting objects:  18% (2/11)        
remote: Counting objects:  27% (3/11)        
remote: Counting objects:  36% (4/11)        
remote: Counting objects:  45% (5/11)        
remote: Counting objects:  54% (6/11)        
remote: Counting objects:  63% (7/11)        
remote: Counting objects:  72% (8/11)        
remote: Counting objects:  81% (9/11)        
remote: Counting objects:  90% (10/11)        
remote: Counting objects: 100% (11/11)        
remote: Counting objects: 100% (11/11), done.        
remote: Compressing objects: 100% (1/1)        
remote: Compressing objects: 100% (1/1), done.        
remote: Total 6 (delta 5), reused 6 (delta 5), pack-reused 0        
From https://github.com/python/cpython
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HEAD is now at bc93923a2d gh-122311: Add more tests for pickle (GH-122376)
Switched to and reset branch 'main'

In file included from ./Modules/tkappinit.c:17:
In file included from /opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/tk.h:99:
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:131:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        int (*free_private)();  /* called to free private storage */
                           ^
                            void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:334:33: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        struct _XImage *(*create_image)();
                                       ^
                                        void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:453:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        XID (*resource_alloc)(); /* allocator function */
                             ^
                              void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:471:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        int (*synchandler)();   /* Synchronization handler */
                          ^
                           void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:496:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        Bool (*event_vec[128])();  /* vector for wire to event */
                              ^
                               void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:497:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        Status (*wire_vec[128])(); /* vector for event to wire */
                               ^
                                void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:509:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        Bool (**error_vec)();      /* vector for wire to error */
                          ^
                           void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:522:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        int (*savedsynchandler)(); /* user synchandler when Xlib usurps */
                               ^
                                void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:1053:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
typedef void (*XIMProc)();
                       ^
                        void
9 warnings generated.
In file included from ./Modules/_tkinter.c:52:
In file included from /opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/tk.h:99:
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:131:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        int (*free_private)();  /* called to free private storage */
                           ^
                            void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:334:33: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        struct _XImage *(*create_image)();
                                       ^
                                        void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:453:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        XID (*resource_alloc)(); /* allocator function */
                             ^
                              void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:471:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        int (*synchandler)();   /* Synchronization handler */
                          ^
                           void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:496:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        Bool (*event_vec[128])();  /* vector for wire to event */
                              ^
                               void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:497:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        Status (*wire_vec[128])(); /* vector for event to wire */
                               ^
                                void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:509:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        Bool (**error_vec)();      /* vector for wire to error */
                          ^
                           void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:522:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
        int (*savedsynchandler)(); /* user synchandler when Xlib usurps */
                               ^
                                void
/opt/homebrew/Cellar/tcl-tk/8.6.13_5/include/tcl-tk/X11/Xlib.h:1053:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
typedef void (*XIMProc)();
                       ^
                        void
9 warnings generated.

make: *** [buildbottest] Error 2

[encukou]

Indeed, this exposes a refleak:

$ ./python -m test test_pickle -m '*CPicklingErrorTests*' -R:8
Using random seed: 131680457
0:00:00 load avg: 1.18 Run 1 test sequentially in a single process
0:00:00 load avg: 1.18 [1/1] test_pickle
beginning 13 repetitions. Showing number of leaks (. for 0 or less, X for 10 or more)
12345:67890123
XX111 11111111
test_pickle leaked [1, 1, 1, 1, 1, 1, 1, 1] references, sum=8
test_pickle failed (reference leak)

[serhiy-storchaka]

Should be fixed in #122411.