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Created on 2021-08-14 22:17 by iritkatriel, last changed 2022-04-11 14:59 by admin. This issue is now closed.
| Messages (6) | |||
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| msg399599 - (view) | Author: Irit Katriel (iritkatriel) *  |
Date: 2021-08-14 22:17 | |
This was found while investigating issue44895. It may or may not be the cause of that issue. The script below hangs on a mac (it's an extract from test_exceptions.test_recursion_in_except_handler). ----------- import sys count = 0 def main(): def f(): global count count += 1 try: f() except RecursionError: f() sys.setrecursionlimit(30) try: f() except RecursionError: pass main() print(count) ----------- When I kill it the traceback shows it alternating between the two recursive calls, but not in a regular pattern: ... [snipped a lot] File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ [Previous line repeated 2 more times] RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ [Previous line repeated 1 more time] RecursionError: maximum recursion depth exceeded During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/iritkatriel/src/cpython/tt.py", line 22, in <module> main() ^^^^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 18, in main f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ [Previous line repeated 10 more times] File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 11, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 13, in f f() ^^^ File "/Users/iritkatriel/src/cpython/tt.py", line 7, in f def f(): KeyboardInterrupt |
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| msg399600 - (view) | Author: Irit Katriel (iritkatriel) * |
Date: 2021-08-14 22:19 | |
Perhaps the interpreter should detect that it is about to raise a RecusionError whose context is another RecursionError, and raise a FatalError instead? |
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| msg399606 - (view) | Author: Mark Shannon (Mark.Shannon) * |
Date: 2021-08-15 07:49 | |
This looks like a duplicate of https://bugs.python.org/issue42951 |
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| msg399608 - (view) | Author: Irit Katriel (iritkatriel) * |
Date: 2021-08-15 08:44 | |
Not sure. Here we do set the recursion limit. |
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| msg399609 - (view) | Author: Mark Shannon (Mark.Shannon) * |
Date: 2021-08-15 09:29 | |
A recursion limit of 30 is effectively infinite. With a debug build of 3.11, the time to execute grows very fast indeed, probably super-exponentially. mark@nero:~/repos/cpython$ time ./python ~/test/test.py 15 real 0m1.107s user 0m1.099s sys 0m0.008s mark@nero:~/repos/cpython$ time ./python ~/test/test.py 16 real 0m4.468s user 0m4.464s sys 0m0.004s mark@nero:~/repos/cpython$ time ./python ~/test/test.py 17 real 0m20.968s user 0m20.928s sys 0m0.040s mark@nero:~/repos/cpython$ time ./python ~/test/test.py 18 real 2m29.562s user 2m29.270s sys 0m0.140s I would expect ./python ~/test/test.py 30 to take millions of years. |
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| msg399614 - (view) | Author: Irit Katriel (iritkatriel) * |
Date: 2021-08-15 11:42 | |
Right, this is a duplicate of issue42951. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:59:48 | admin | set | github: 89080 |
| 2021-08-15 11:42:46 | iritkatriel | set | status: open -> closed superseder: Random and infinite loop in dealing with recursion error for "try-except " messages: + msg399614 resolution: duplicate stage: resolved |
| 2021-08-15 09:29:35 | Mark.Shannon | set | messages: + msg399609 |
| 2021-08-15 08:44:20 | iritkatriel | set | messages: + msg399608 |
| 2021-08-15 07:49:05 | Mark.Shannon | set | nosy:
+ Mark.Shannon messages: + msg399606 |
| 2021-08-14 22:19:04 | iritkatriel | set | messages: + msg399600 |
| 2021-08-14 22:17:05 | iritkatriel | create | |