[issue44917] interpreter hangs on recursion in both body and handler of a try block

[Irit Katriel]

Irit Katriel  added the comment:

Right, this is a duplicate of issue42951.

--
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> Random and infinite loop in dealing with recursion error for 
"try-except "

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[issue44917] interpreter hangs on recursion in both body and handler of a try block

[Mark Shannon]

Mark Shannon  added the comment:

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

real0m1.107s
user0m1.099s
sys 0m0.008s
mark@nero:~/repos/cpython$ time ./python ~/test/test.py 16

real0m4.468s
user0m4.464s
sys 0m0.004s
mark@nero:~/repos/cpython$ time ./python ~/test/test.py 17

real0m20.968s
user0m20.928s
sys 0m0.040s
mark@nero:~/repos/cpython$ time ./python ~/test/test.py 18

real2m29.562s
user2m29.270s
sys 0m0.140s


I would expect ./python ~/test/test.py 30 to take millions of years.

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[issue44917] interpreter hangs on recursion in both body and handler of a try block

[Irit Katriel]

Irit Katriel  added the comment:

Not sure. Here we do set the recursion limit.

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[issue44917] interpreter hangs on recursion in both body and handler of a try block

[Mark Shannon]

Mark Shannon  added the comment:

This looks like a duplicate of https://bugs.python.org/issue42951

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nosy: +Mark.Shannon

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[issue44917] interpreter hangs on recursion in both body and handler of a try block

[Irit Katriel]

Irit Katriel  added the comment:

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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[issue44917] interpreter hangs on recursion in both body and handler of a try block

[Irit Katriel]

New submission from Irit Katriel :

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