[Subinterpreters]: use static variable under building Python with --with-experimental-isolated-subinterpreters cause crash.

[JunyiXie]

BPO	43588
Nosy	@vstinner, @corona10, @shihai1991, @JunyiXie, @kumaraditya303
PRs	bpo-43588: use static variable module under building Python with --with-experimental-isolated-subinterpreters cause crash. #24963 bpo-43551: fix PyImport_Import use static silly_list, under building Python with --with-experimental-isolated-subinterpreters share silly_list in multi sub interpreters cause crash. #24929 bpo-43588: fix exceptions.c use static variable under building Python with --with-experimental-isolated-subinterpreters may cause crash. #24965 bpo-43588: fix boolobject.c static variables under building under building Python with --with-experimental-isolated-subinterpreters may cause crash #24966 bpo-43588: fix codeobject.c static variables under building under building Python with --with-experimental-isolated-subinterpreters may cause crash. #24968 bpo-43588: fix sysmodule.c use static variables under building under building Python with --with-experimental-isolated-subinterpreters may cause crash #24969 bpo-43588: fix codecs.c static variables under building under building Python with --with-experimental-isolated-subinterpreters may cause crash. #24970 bpo-43588: fix _warnings.c static variables under building under building Python with --with-experimental-isolated-subinterpreters may cause crash #24971 bpo-43588: fix listobject.c use static variables under building under building Python with --with-experimental-isolated-subinterpreters may cause crash #24972

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-03-22.08:09:32.063>
labels = ['expert-subinterpreters', '3.10', 'type-crash']
title = '[Subinterpreters]: use static variable under building Python with --with-experimental-isolated-subinterpreters cause crash.'
updated_at = <Date 2022-04-07.08:17:57.850>
user = 'https://github.com/JunyiXie'

bugs.python.org fields:

activity = <Date 2022-04-07.08:17:57.850>
actor = 'kumaraditya'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Subinterpreters']
creation = <Date 2021-03-22.08:09:32.063>
creator = 'JunyiXie'
dependencies = []
files = []
hgrepos = []
issue_num = 43588
keywords = ['patch']
message_count = 13.0
messages = ['389282', '389284', '389292', '389300', '389304', '389310', '389311', '389322', '389323', '389324', '406069', '406080', '416918']
nosy_count = 5.0
nosy_names = ['vstinner', 'corona10', 'shihai1991', 'JunyiXie', 'kumaraditya']
pr_nums = ['24963', '24929', '24965', '24966', '24968', '24969', '24970', '24971', '24972']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue43588'
versions = ['Python 3.10']

[JunyiXie]

use static module variable under building Python with --with-experimental-isolated-subinterpreters cause crash.
compiler_mod(struct compiler *c, mod_ty mod)
{
    PyCodeObject *co;
    int addNone = 1;
    static PyObject *module;
    if (!module) {
        module = PyUnicode_InternFromString("<module>");
        if (!module)
            return NULL;
    }
...
}

[JunyiXie]

43551 [Subinterpreters]: PyImport_Import use static silly_list under building Python with --with-experimental-isolated-subinterpreters share silly_list in multi subinterpreters cause crash.
https://bugs.python.org/issue43551

[JunyiXie]

grep -E 'static (\w+) \(\w+) =' $(find . -name "*.c") | wc -l
67 static variable may need fix
➜ cpython git:(master) grep -E 'static (\w+) \(\w+) =' $(find . -name "*.c")
./PC/winreg.c:static char *failMsg = "bad operand type";
./Python/codecs.c:static _PyUnicode_Name_CAPI *ucnhash_capi = NULL;
./Python/initconfig.c:static char *_Py_StandardStreamEncoding = NULL;
./Python/initconfig.c:static char *_Py_StandardStreamErrors = NULL;
./Python/import.c:static PyObject *extensions = NULL;
./Python/import.c: static PyObject *builtins_str = NULL;
./Python/import.c: static PyObject *import_str = NULL;
./Python/sysmodule.c: static PyObject *newline = NULL;
./Python/_warnings.c: static PyObject *importlib_string = NULL;
./Python/_warnings.c: static PyObject *bootstrap_string = NULL;
./Objects/unicodeobject.c:static _PyUnicode_Name_CAPI *ucnhash_capi = NULL;
./Objects/codeobject.c: static PyObject *emptystring = NULL;
./Objects/codeobject.c: static PyObject *nulltuple = NULL;
./Objects/listobject.c:static PyObject *indexerr = NULL;
./Objects/exceptions.c: static PyObject *print_prefix = NULL;
./Objects/exceptions.c: static PyObject *exec_prefix = NULL;
./Objects/boolobject.c:static PyObject *false_str = NULL;
./Objects/boolobject.c:static PyObject *true_str = NULL;
./Parser/pegen.c: static void *cache = NULL;
./Modules/_cursesmodule.c:static char *screen_encoding = NULL;
./Modules/arraymodule.c: static PyObject *array_reconstructor = NULL;
./Modules/_tkinter.c: static PyObject *tcl_library_path = NULL;
./Modules/_tkinter.c:static PyThreadState *tcl_tstate = NULL;
./Modules/_tkinter.c:static PyThreadState *event_tstate = NULL;
./Modules/syslogmodule.c:static PyObject *S_ident_o = NULL; /* identifier, held by openlog() */
./Modules/_tracemalloc.c:static PyObject *unknown_filename = NULL;
./Modules/_tracemalloc.c:static _Py_hashtable_t *tracemalloc_filenames = NULL;
./Modules/_tracemalloc.c:static traceback_t *tracemalloc_traceback = NULL;
./Modules/_tracemalloc.c:static _Py_hashtable_t *tracemalloc_tracebacks = NULL;
./Modules/_tracemalloc.c:static _Py_hashtable_t *tracemalloc_traces = NULL;
./Modules/_tracemalloc.c:static _Py_hashtable_t *tracemalloc_domains = NULL;
./Modules/_ssl.c: static PyObject *x509_asn = NULL;
./Modules/_ssl.c: static PyObject *pkcs_7_asn = NULL;
./Modules/_ssl.c:static PyThread_type_lock *_ssl_locks = NULL;
./Modules/_testbuffer.c:static PyObject *structmodule = NULL;
./Modules/_testbuffer.c:static PyObject *Struct = NULL;
./Modules/_testbuffer.c:static PyObject *calcsize = NULL;
./Modules/_testbuffer.c:static PyObject *simple_format = NULL;
./Modules/_testbuffer.c:static char *infobuf = NULL;
./Modules/_io/bufferedio.c: static PyObject *eintr_int = NULL;
./Modules/_asynciomodule.c:static futureiterobject *fi_freelist = NULL;
./Modules/_zoneinfo.c:static PyObject *io_open = NULL;
./Modules/_zoneinfo.c:static PyObject *_tzpath_find_tzfile = NULL;
./Modules/_zoneinfo.c:static PyObject *_common_mod = NULL;
./Modules/_zoneinfo.c:static PyObject *TIMEDELTA_CACHE = NULL;
./Modules/_zoneinfo.c:static PyObject *ZONEINFO_WEAK_CACHE = NULL;
./Modules/_zoneinfo.c:static StrongCacheNode *ZONEINFO_STRONG_CACHE = NULL;
./Modules/_sqlite/microprotocols.c:static PyObject *psyco_adapters = NULL;
./Modules/_ssl/debughelpers.c: static PyThread_type_lock *lock = NULL;
./Modules/_datetimemodule.c:static PyObject *us_per_ms = NULL; /* 1000 */
./Modules/_datetimemodule.c:static PyObject *us_per_second = NULL; /* 1000000 */
./Modules/_datetimemodule.c:static PyObject *us_per_minute = NULL; /* 1e6 * 60 as Python int */
./Modules/_datetimemodule.c:static PyObject *us_per_hour = NULL; /* 1e6 * 3600 as Python int */
./Modules/_datetimemodule.c:static PyObject *us_per_day = NULL; /* 1e6 * 3600 * 24 as Python int */
./Modules/_datetimemodule.c:static PyObject *us_per_week = NULL; /* 1e6*3600*24*7 as Python int */
./Modules/_datetimemodule.c:static PyObject *seconds_per_day = NULL; /* 3600*24 as Python int */
./Modules/_datetimemodule.c: static PyObject *module = NULL;
./Modules/_decimal/_decimal.c:static PyObject *tls_context_key = NULL;
./Modules/_decimal/_decimal.c:static PyDecContextObject *cached_context = NULL;
./Modules/_decimal/_decimal.c:static PyObject *current_context_var = NULL;
./Modules/_decimal/_decimal.c:static PyObject *default_context_template = NULL;
./Modules/_decimal/_decimal.c:static PyObject *basic_context_template = NULL;
./Modules/_decimal/_decimal.c:static PyObject *extended_context_template = NULL;
./Modules/_decimal/_decimal.c:static PyObject *DecimalException = NULL;
./Modules/_decimal/_decimal.c:static PyObject *Rational = NULL;
./Modules/_decimal/_decimal.c:static PyTypeObject *DecimalTuple = NULL;
./Modules/_decimal/_decimal.c: static PyObject *capsule = NULL;

[JunyiXie]

fix
./Objects/exceptions.c: static PyObject *print_prefix = NULL;
./Objects/exceptions.c: static PyObject *exec_prefix = NULL;

#24965

[vstinner]

Oh. I didn't expect so many "static" variables. I suggest to wait until a PEP is accepted for running multiple interpreters in parallel.

[JunyiXie]

Okay, I will fix these problems first. (Need for your own project)

[JunyiXie]

-> Okay, I will fix these problems first. (Need for my own project)

[JunyiXie]

I will fix the static variable problem of frequently used code

[corona10]

@JunyiXie

Please wait your patch until the PEP is approved.