`MemoryError` during parse can escalate to `SystemError` and abort on small input

Crash report

What happened?

string = (
    b'(*h(((h(h(h(' +
    b'[' * 35 +
    b'*h(' +
    b'[' * 38 +
    b'**h(' +
    b'[' * 31 +
    b'(' * 4 +
    b'~' * 20 +
    b'F{' +
    b'[' * 27 +
    b'**h(' +
    b'[' * 31 +
    b'(' * 4 +
    b'~' * 23 +
    b'F{F"{F"{F"{F"{F"{F"{F"{FF""{{F"{""{F"{F{{F"{F"{F"\\}'
)

compile(string, "<input>", "single")

Gives me:

Fatal Python error: _Py_CheckFunctionResult: a function returned a result with an exception set
Python runtime state: initialized
MemoryError: Parser stack overflowed - Python source too complex to parse

The above exception was the direct cause of the following exception:

SystemError: <class 'SyntaxWarning'> returned a result with an exception set

Current thread 0x00007efd1b8e8780 [python] (most recent call first):
  File "/tmp/repro.py", line 19 in <module>
Aborted                    (core dumped) ./python /tmp/repro.py

Found by OSS-Fuzz.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Output from running 'python -VV' on the command line:

No response

Linked PRs

• gh-150067

在 CPython main 上執行提供的 compile() 重現程式，並將其 MemoryError/SystemError 失敗與回報的致命中止進行比較。閱讀涉及的 parser 和 SyntaxWarning 處理，然後檢視連結的 PR gh-150067。當輸入不再中止直譯器，也不再將 parser 錯誤升級為 SystemError 時，即視為完成。