gh-106182: sys: Intern getfilesystemencoding() and getfilesystemencodeerrors()

[methane]

• Issue: sys.getfilesystemencoding() should return interned string #106182

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Arch Linux TraceRefs 3.x has failed when building commit f1034ba.

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/all/#builders/484/builds/3569) and take a look at the build logs.
4. Check if the failure is related to this commit (f1034ba) 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/all/#builders/484/builds/3569

Failed tests:

• test__xxsubinterpreters
• test_capi

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

==

Click to see traceback logs

remote: Enumerating objects: 16, done.        
remote: Counting objects:   6% (1/16)        
remote: Counting objects:  12% (2/16)        
remote: Counting objects:  18% (3/16)        
remote: Counting objects:  25% (4/16)        
remote: Counting objects:  31% (5/16)        
remote: Counting objects:  37% (6/16)        
remote: Counting objects:  43% (7/16)        
remote: Counting objects:  50% (8/16)        
remote: Counting objects:  56% (9/16)        
remote: Counting objects:  62% (10/16)        
remote: Counting objects:  68% (11/16)        
remote: Counting objects:  75% (12/16)        
remote: Counting objects:  81% (13/16)        
remote: Counting objects:  87% (14/16)        
remote: Counting objects:  93% (15/16)        
remote: Counting objects: 100% (16/16)        
remote: Counting objects: 100% (16/16), done.        
remote: Compressing objects:  11% (1/9)        
remote: Compressing objects:  22% (2/9)        
remote: Compressing objects:  33% (3/9)        
remote: Compressing objects:  44% (4/9)        
remote: Compressing objects:  55% (5/9)        
remote: Compressing objects:  66% (6/9)        
remote: Compressing objects:  77% (7/9)        
remote: Compressing objects:  88% (8/9)        
remote: Compressing objects: 100% (9/9)        
remote: Compressing objects: 100% (9/9), done.        
remote: Total 9 (delta 7), reused 2 (delta 0), pack-reused 0        
From https://github.com/python/cpython
 * branch                  main       -> FETCH_HEAD
Note: switching to 'f1034ba7f67400e7ed7e299dc8b22521c4e43246'.

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

HEAD is now at f1034ba7f6 gh-106182: sys: Intern getfilesystemencoding() and getfilesystemencodeerrors() (#106183)
Switched to and reset branch 'main'

Objects/object.c:2197: _Py_ForgetReference: Assertion failed: invalid object chain
Enable tracemalloc to get the memory block allocation traceback

object address  : 0x7fae73ed0740
object refcount : 0
object type     : 0x557f5e177960
object type name: float
object repr     : <refcnt 0 at 0x7fae73ed0740>

Fatal Python error: _PyObject_AssertFailed: _PyObject_AssertFailed
Python runtime state: initialized

Thread 0x00007fae808bb6c0 (most recent call first):
  File "<string>", line 10 in subthread
  File "/buildbot/buildarea/3.x.pablogsal-arch-x86_64/build/Lib/threading.py", line 989 in run
  File "/buildbot/buildarea/3.x.pablogsal-arch-x86_64/build/Lib/threading.py", line 1052 in _bootstrap_inner
  File "/buildbot/buildarea/3.x.pablogsal-arch-x86_64/build/Lib/threading.py", line 1009 in _bootstrap

Current thread 0x00007fae81745740 (most recent call first):
  File "/buildbot/buildarea/3.x.pablogsal-arch-x86_64/build/Lib/test/support/threading_helper.py", line 142 in start_threads
  File "/buildbot/buildarea/3.x.pablogsal-arch-x86_64/build/Lib/contextlib.py", line 144 in __exit__
  File "<string>", line 14 in <module>

Extension modules: _testinternalcapi (total: 1)
Debug memory block at address p=0x7fae8166dce0: API '�'
    18302063728033390045 bytes originally requested
    The 7 pad bytes at p-7 are not all FORBIDDENBYTE (0xfd):
        at p-7: 0xdd *** OUCH
        at p-6: 0xdd *** OUCH
        at p-5: 0xdd *** OUCH
        at p-4: 0xdd *** OUCH
        at p-3: 0xdd *** OUCH
        at p-2: 0xdd *** OUCH
        at p-1: 0xdd *** OUCH
    Because memory is corrupted at the start, the count of bytes requested
       may be bogus, and checking the trailing pad bytes may segfault.
    The 8 pad bytes at tail=0xfdfe7dac7f64babd are Fatal Python error: Segmentation fault

Thread 0x00007fae808bb6c0 (most recent call first):
  File "<string>", line 10 in subthread
  File "/buildbot/buildarea/3.x.pablogsal-arch-x86_64/build/Lib/threading.py", line 989 in run
  File "/buildbot/buildarea/3.x.pablogsal-arch-x86_64/build/Lib/threading.py", line 1052 in _bootstrap_inner
  File "/buildbot/buildarea/3.x.pablogsal-arch-x86_64/build/Lib/threading.py", line 1009 in _bootstrap

Current thread 0x00007fae81745740 (most recent call first):
  File "/buildbot/buildarea/3.x.pablogsal-arch-x86_64/build/Lib/test/support/threading_helper.py", line 142 in start_threads
  File "/buildbot/buildarea/3.x.pablogsal-arch-x86_64/build/Lib/contextlib.py", line 144 in __exit__
  File "<string>", line 14 in <module>

Extension modules: _testcapi, _testmultiphase, _testsinglephase, _xxsubinterpreters, _testinternalcapi (total: 5)
make: *** [Makefile:2006: buildbottest] Segmentation fault (core dumped)

Cannot open file '/buildbot/buildarea/3.x.pablogsal-arch-x86_64/build/test-results.xml' for upload