[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

Change by STINNER Victor :


Added file: https://bugs.python.org/file50251/strict_refleak_check.patch

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

I changed it to 

+for i in range(2):
+dash_R_cleanup(fs, ps, pic, zdc, abcs)
+support.gc_collect()


(loop twice instead of 3 times) and that seems fine too.

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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

STINNER Victor  added the comment:

> (once I remove the @skip on test_no_hang_on_context_chain_cycle2). 

Oh. I forgot that the test is still skipped!


> With your patch I don't see a leak for refleak.py, but I still see one for 
> ./python.exe -m test -R 3:3 test_exceptions -m 
> test_no_hang_on_context_chain_cycle2 -m 
> test_recursion_normalizing_infinite_exception -m 
> test_recursion_in_except_handler -m test_recursion_normalizing_with_no_memory 
> -F -j1

If I apply attached strict_refleak_check.patch and I remove @unittest.skip("See 
issue 44895") of test_no_hang_on_context_chain_cycle2(), I get:

$ ./python -m test -R 3:3 test_exceptions -m 
test_no_hang_on_context_chain_cycle2 -m 
test_recursion_normalizing_infinite_exception -m 
test_recursion_in_except_handler -m test_recursion_normalizing_with_no_memory

(...)
test_exceptions leaked [6, -6, 6] references, sum=6
(...)

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

With your patch I don't see a leak for refleak.py, but I still see one for 

./python.exe -m test -R 3:3 test_exceptions -m 
test_no_hang_on_context_chain_cycle2 -m 
test_recursion_normalizing_infinite_exception -m 
test_recursion_in_except_handler -m test_recursion_normalizing_with_no_memory 
-F -j1

(once I remove the @skip on test_no_hang_on_context_chain_cycle2). 


However, if I make this change it looks better:


--- a/Lib/test/libregrtest/refleak.py
+++ b/Lib/test/libregrtest/refleak.py
@@ -90,8 +90,9 @@ def get_pooled_int(value):
 for i in rep_range:
 test_func()
 
-dash_R_cleanup(fs, ps, pic, zdc, abcs)
-support.gc_collect()
+for i in range(3):
+dash_R_cleanup(fs, ps, pic, zdc, abcs)
+support.gc_collect()

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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 679cb4781ea370c3b3ce40d3334dc404d7e9d92b by Victor Stinner in 
branch 'main':
bpo-44895: libregrtest: refleak check clears types later (GH-28113)
https://github.com/python/cpython/commit/679cb4781ea370c3b3ce40d3334dc404d7e9d92b


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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

Change by STINNER Victor :


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keywords: +patch
pull_requests: +26554
pull_request: https://github.com/python/cpython/pull/28113

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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

STINNER Victor  added the comment:

>  I changed dash_R_cleanup to put the sys._clear_type_cache() after 
> clear_caches() and the leak is gone

Aha! The order of function calls in dash_R_cleanup() matters.

Calling sys._clear_type_cache() at the end of dash_R_cleanup() perfectly makes 
sense. If you do that, please add a comment to explain that the order matters. 
For example, the code about ABC classes is likely to modify classes.

About the gc_collect() call, I dislike calling it in clear_caches() and then 
again in dash_R_cleanup(). I would even prefer to *remove* it from both 
functions and call it explicitly at the call site: in dash_R() and in 
runtest.py.

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

Oh, I see now what you meant. 

I think you're right that it's cleanup. I changed dash_R_cleanup to put the 
sys._clear_type_cache() after clear_caches() and the leak is gone:

@@ -166,9 +166,6 @@ def dash_R_cleanup(fs, ps, pic, zdc, abcs):
 zipimport._zip_directory_cache.clear()
 zipimport._zip_directory_cache.update(zdc)
 
-# clear type cache
-sys._clear_type_cache()
-
 # Clear ABC registries, restoring previously saved ABC registries.
 abs_classes = [getattr(collections.abc, a) for a in 
collections.abc.__all__]
 abs_classes = filter(isabstract, abs_classes)
@@ -181,6 +178,12 @@ def dash_R_cleanup(fs, ps, pic, zdc, abcs):
 
 clear_caches()
 
+# clear type cache
+sys._clear_type_cache()
+
+support.gc_collect()
+



I did this because I suspected it's something related to types, because it only 
happen when we define the exception classes (A and B) inside the test function. 

So maybe the type objects of these exceptions are not cleared from the type 
cache because they have refcount > 0 but by the time  clear_caches() and 
gc.collect() finish they are cleared?


Note this doesn't mean the change I made is always right - maybe the whole body 
of dash_R_cleanup should be in a loop until nothing changes?

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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

STINNER Victor  added the comment:

> It could be a problem with the way _Py_RefTotal is incremented/decremented.

It can be a cache which is kept alive and then clear the following iteration. 
See my previous comment:

test leaked [-4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 
4] references, sum=0

libregrtest/refleak.py does its best to clear *all* caches, type caches, free 
lists, etc. A single cache which is not cleared can confused libregrtest.

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

Victor - I am also getting a feeling that this may not be a real leak but 
rather a bug in the refleaks test bookkeeping. 

It could be a problem with the way _Py_RefTotal is incremented/decremented.

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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

STINNER Victor  added the comment:

A variant of this problem: bpo-36560 with a leak 1 memory block per iteration.

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

I think the leak happens when we invoke GC while the recursion limit is 
exceeded. It goes way if make this change:


def recurse_in_body_and_except():
try:
recurse_in_body_and_except()
except RecursionError as e:
gc.disable()
recurse_in_body_and_except()
gc.enable()


I also added a __del__ to B and saw it being called when recursion limit is 
small (though adding the __del__ makes the leak go away. Actually just adding 
"def f(): pass" is enough to make it go away).

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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

STINNER Victor  added the comment:

You can also play with the clear() method of frame objects and 
traceback.clear_frames() (which expects a traceback object).

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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

STINNER Victor  added the comment:

> test leaked [-4, 4, -4] references, sum=-4

If I disable the GC, the script no longer detects "leaks". Same using a GC 
threshold of 800.

Using a GC threshold between 100 and 700, I reproduce the [-4, 4, -4] 
references leak.

Funny bug.

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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

STINNER Victor  added the comment:

Irit: do you still reproduce the issue using gc.disable()? Or you can try 
different values to call gc.set_threshold(). You may also try different values 
in ns.huntrleaks, like: ns.huntrleaks = (3, 20, 'tt_out.py'). With 20 
iterations, do you still reproduce the leak?

To make the issue more likely, you can change check_rc_deltas() in 
Lib/test/libregrtest/refleak.py. Try:

def check_rc_deltas(deltas):
return any(delta >= 1 for delta in deltas)

With this change, the script stops immediately:

test leaked [-4, 4, -4] references, sum=-4
test leaked [-4, 4, -4] memory blocks, sum=-4

Using 20 iterations, I get:

test leaked [-4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 
4] references, sum=0
test leaked [-4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 
4] memory blocks, sum=0

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[issue44895] refleak test failure in test_exceptions

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

There is some timing-related race condition at hand because I tried in a Linux 
machine and a MacBook Pro (intel) laptop and I wasn't able to reproduce after 
20 min of the script running :(

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

> Could you outline how are you reproducing the leaks?

Sorry I missed this. Just run the script:


iritkatriel@Irits-MBP cpython-1 % ./python.exe refleak.py
-- 1 --
beginning 6 repetitions
123456
..
-- 2 --
beginning 6 repetitions
123456
..
-- 3 --
beginning 6 repetitions
123456
..
test leaked [2, 4, 2] references, sum=8
test leaked [2, 4, 2] memory blocks, sum=8

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

I'm using a mac. It typically fails within at most 10-20 iterations.

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[issue44895] refleak test failure in test_exceptions

[Mark Shannon]

Mark Shannon  added the comment:

refleak.py seems to run forever for me. Got bored after 6000 iterations.

Which O/S and configure options are needed for refleak.py to fail?

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

This doesn't leak:

try:
raise B()
except B:
tb = sys.exc_info()[1].__traceback__

So this isn't about the traceback being part of the cycle. The B() needs to be 
there too.

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[issue44895] refleak test failure in test_exceptions

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

> But this makes it not leak again, so now we know it's the traceback:

The traceback is a very heavy gc object because it contains the frames, and in 
the locals of the frame is the traceback itself via the exception. This is a 
well known heavy cycle, but the gc should take care of it if the cycle becomes 
isolated

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[issue44895] refleak test failure in test_exceptions

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

I am still amazed that I cannot reproduce the leaks on my machine. Maybe I am 
missing some steps.

Could you outline how are you reproducing the leaks?

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

But this makes it not leak again, so now we know it's the traceback:

try:
raise B()
except B:
b = sys.exc_info()[1]
b.__traceback__ = None

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

It's probably not that because this leaks too, and it skips the cleanup:

try:
raise B()
except B:
b = sys.exc_info()[1]

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[issue44895] refleak test failure in test_exceptions

[Guido van Rossum]

Guido van Rossum  added the comment:

So there's code generated for an except clause with a variable that clears the 
variable at the end, so that this works:

try:
  ...
except Exception as err:
  ...
print(err)  # Should fail, since err was cleared when the except clause exited.

Maybe there's a bug here, either in the runtime or in the way that the code is 
generated?

--
nosy: +gvanrossum

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

I'm pretty sure the frame locals is involved. 

This leaks (not a is being re-raised, not b):

-
def test_no_hang_on_context_chain_cycle2():
class A(Exception): pass
class B(Exception): pass

try:
try:
raise A()
except A as _a:
a = _a
try:
raise B() 
except B as _b:
b = _b
raise a 
except A: 
pass
-

But this doesn't leak:

-
def test_no_hang_on_context_chain_cycle2():
class A(Exception): pass
class B(Exception): pass

try:
try:
raise A()
except A as _a:
a = _a
try:
raise B() 
except B as _b:
pass # b = _b  <== not saving b in a local
raise a 
except A: 
pass
-

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Change by Irit Katriel :


--
Removed message: https://bugs.python.org/msg399763

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

I'm pretty sure the frame locals is involved. 

This leaks (note that a is being re-raised, not b):

-
def test_no_hang_on_context_chain_cycle2():
class A(Exception): pass
class B(Exception): pass

try:
try:
raise A()
except A as _a:
a = _a
try:
raise B() 
except B as _b:
b = _b
raise a 
except A: 
pass
-

But this doesn't leak:

-
def test_no_hang_on_context_chain_cycle2():
class A(Exception): pass
class B(Exception): pass

try:
try:
raise A()
except A as _a:
a = _a
try:
raise B() 
except B as _b:
pass # b = _b  <== not saving b in a local
raise a 
except A: 
pass
-

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[issue44895] refleak test failure in test_exceptions

[Dong-hee Na]

Dong-hee Na  added the comment:


New changeset c2c857b40f226575d64e0d56a759cbd799f51e62 by Dong-hee Na in branch 
'main':
bpo-44895: Introduce PYTHONDUMPREFSFILE variable for refcount dumping (GH-27767)
https://github.com/python/cpython/commit/c2c857b40f226575d64e0d56a759cbd799f51e62


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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

But if I also add a gc loop at the beginning of 
test_recursion_in_except_handler, the leak goes away.

def test_recursion_in_except_handler():
while gc.collect(): 
   pass
def set_relative_recursion_limit(n):
...


So maybe test_recursion_in_except_handler is resurrecting something that 
test_no_hang_on_context_chain_cycle2 has let go of?

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

However, if I replace the assignment with a gc.collect() call, it still leaks:

def test_no_hang_on_context_chain_cycle2():
while gc.collect():
pass
class A(Exception):
pass
class B(Exception):
pass
...


I also changed gc_collect in Lib/test/support/__init__.py (which is called by 
the refleak check) to loop until gc.collect() returns 0 (currently it calls 
gc.collect() 3 times).  Still leaks.

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[issue44895] refleak test failure in test_exceptions

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

>> x = list(range(100))

Is creating a lot of objects, and the gc has a chance to run on every object 
creation so maybe what's happening there is that you are inadvertently 
triggering the gc

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

It's midnight, so just one last weirdness before I turn into a pumpkin:

If I add this assignment to x the issue seems to go away (or become less 
frequent so I don't see it?)   But if I assign x to a small constant it still 
leaks. 


def test_no_hang_on_context_chain_cycle2():
x = list(range(100))
class A(Exception):
pass
class B(Exception):
pass

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

I meant refleaks.py, not reflinks.py.

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

I've reproduced the leak in 3.10 (with the reflinks.py script).

In 3.9 the double-recursion segfaults:

Fatal Python error: _Py_CheckRecursiveCall: Cannot recover from stack overflow.
Python runtime state: initialized

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

(Pdb) test_no_hang_on_context_chain_cycle2.__code__.co_consts[1]

(Pdb) 
sys.getrefcount(test_no_hang_on_context_chain_cycle2.__code__.co_consts[1])
2
(Pdb) 
gc.get_referrers(test_no_hang_on_context_chain_cycle2.__code__.co_consts[1])
[]

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

The leak seems to be due to the nested definitions of the Exception types A and 
B. It goes away if I move them out of the function so that it's like:


class A(Exception):
pass
class B(Exception):
pass

def test_no_hang_on_context_chain_cycle2():
try:
try:
raise A()
except A as _a:
a = _a
try:
raise B()
except B as _b:
b = _b
raise b
except B:
pass

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

I've attached an even shorter script (refleak.py) that reproduces the leak.

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Added file: https://bugs.python.org/file50224/refleak.py

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[issue44895] refleak test failure in test_exceptions

[miss-islington]

miss-islington  added the comment:


New changeset 1960409a6dcbd1e3527f02b523bd27df9086dd77 by Miss Islington (bot) 
in branch '3.10':
bpo-44895: skip test_no_hang_on_context_chain_cycle2 until the refleak is fixed 
(GH-27761)
https://github.com/python/cpython/commit/1960409a6dcbd1e3527f02b523bd27df9086dd77


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[issue44895] refleak test failure in test_exceptions

[miss-islington]

Change by miss-islington :


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pull_request: https://github.com/python/cpython/pull/27778

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[issue44895] refleak test failure in test_exceptions

[Łukasz Langa]

Łukasz Langa  added the comment:


New changeset 62bc716fde20fcb7b47416c7959be9e66df93212 by Irit Katriel in 
branch 'main':
bpo-44895: skip test_no_hang_on_context_chain_cycle2 until the refleak is fixed 
(GH-27761)
https://github.com/python/cpython/commit/62bc716fde20fcb7b47416c7959be9e66df93212


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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

I created issue44917 for the recursion hang because it seems like it's really 
another bug.

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[issue44895] refleak test failure in test_exceptions

[Dong-hee Na]

Dong-hee Na  added the comment:

GH-27767 is a tooling patch for extract dump easily.
See cpython-1628938551.dump.gz for msg399588.

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[issue44895] refleak test failure in test_exceptions

[Dong-hee Na]

Change by Dong-hee Na :


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pull_requests: +26243
pull_request: https://github.com/python/cpython/pull/27767

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[issue44895] refleak test failure in test_exceptions

[Dong-hee Na]

Dong-hee Na  added the comment:

Here is the dump I extracted.

0:00:00 load avg: 2.89 Run tests sequentially
0:00:00 load avg: 2.89 [1/1] test_exceptions
beginning 6 repetitions
123456
..
test_exceptions leaked [6, 6, 6] references, sum=18
test_exceptions leaked [6, 6, 6] memory blocks, sum=18
test_exceptions failed (reference leak)

== Tests result: FAILURE ==

1 test failed:
test_exceptions

1 re-run test:
test_exceptions

Total duration: 5.7 sec
Tests result: FAILURE

--
Added file: https://bugs.python.org/file50216/cpython-1628938551.dump.gz

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[issue44895] refleak test failure in test_exceptions

[Chris Jerdonek]

Chris Jerdonek  added the comment:

FYI, I tried myself, and setting PYTHONHASHSEED didn't make the failures 
deterministic.

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[issue44895] refleak test failure in test_exceptions

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

If someone can reproduce more or less reliably, it would be great to know where 
are the leaked objects. For that, compile CPython with "-with-trace-refs", 
surround the suspicious test in a loop (test_no_hang_on_context_chain_cycle2 
for example) of a 1000 or more iterations and run the test with the 
PYTHONDUMPREFS=1 environment variable. You will see the leaked objects at 
shutdown hopefully.

Hopefully the leaked objects would be a gigantic set by then so we the number 
of references will be noticeable.

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[issue44895] refleak test failure in test_exceptions

[Chris Jerdonek]

Chris Jerdonek  added the comment:

Last question: might trying different values of PYTHONHASHSEED help?

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

For instance, if memory addresses of objects are different, so objects sort 
differently in different runs on the same system.

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[issue44895] refleak test failure in test_exceptions

[Chris Jerdonek]

Chris Jerdonek  added the comment:

"How does this explain it not being non-deterministic on" -> "How does this 
explain it not being deterministic on"

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[issue44895] refleak test failure in test_exceptions

[Chris Jerdonek]

Chris Jerdonek  added the comment:

> Maybe it's a very precise threshold which triggers the issue. Between Linux 
> and macOS, the site module executes different code paths which produce 
> different GC counters.
> Sometimes, the GC must happen in a very precise line, one line later is too 
> late.

How does this explain it not being non-deterministic on, say, macOS since the 
same lines of code will be executing each time? Is there a way to force things 
to happen in a deterministic fashion? (I interpreted the responses to mean that 
it's non-deterministic even when run on the same machine, so I'm not talking 
about, say, the differences from running macOS on different machines.)

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

Regarding the hang in msg399539, do we need some special handling of the case 
were a RecursionError is being raised and its context is another 
RecursionError?  Like a FatalError?

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[issue44895] refleak test failure in test_exceptions

[Dong-hee Na]

Dong-hee Na  added the comment:

Oops sorry. 

Without PR 27746, I was able to reproduce on my macOS environment.

test_exceptions leaked [6, 6, 6] references, sum=18
test_exceptions leaked [6, 6, 6] memory blocks, sum=18
test_exceptions failed (reference leak)

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Change by Irit Katriel :


--
pull_requests: +26237
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/27761

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[issue44895] refleak test failure in test_exceptions

[Dong-hee Na]

Dong-hee Na  added the comment:

> However hang was able to reproduce.

I meant msg399539

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[issue44895] refleak test failure in test_exceptions

[Dong-hee Na]

Dong-hee Na  added the comment:

>From my macOS, I was not able to reproduce the issue also as like as Victor 
>and Pablo.

repeat 10 ./python.exe -m test -R 3:3 test_exceptions -m 
test_no_hang_on_context_chain_cycle2 -m 
test_recursion_normalizing_infinite_exception -m 
test_recursion_in_except_handler -m test_recursion_normalizing_with_no_memory

However hang was able to reproduce.

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

Adding Mark since he worked on recursion recently.

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nosy: +Mark.Shannon

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

The script below hangs on my mac (it's an extract from 
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 

[issue44895] refleak test failure in test_exceptions

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

I have tried to reproduce this on my Linux and Mac machines and I have been 
unable to do it for the time being in either of them.

--
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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

STINNER Victor  added the comment:

Chris:
> Out of curiosity, is the failure deterministic in environments where it 
> fails? If not, what is the source of the indeterminism -- some kind of race 
> condition or something else?

The GC uses counters and thresholds to decide which collection and when they 
should be collected. I tried to play with gc.set_threshold(), but I failed to 
reproduce the issue on Linux.

Maybe it's a very precise threshold which triggers the issue. Between Linux and 
macOS, the site module executes different code paths which produce different GC 
counters.

Sometimes, the GC must happen in a very precise line, one line later is too 
late. See bpo-44422 for a case of threading.enumerate() (different kind of bug, 
but it's related to the GC). See bpo-44184 for another example of GC bug which 
only occurred on Windows and only if you type an exact command line.

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[issue44895] refleak test failure in test_exceptions

[Łukasz Langa]

Łukasz Langa  added the comment:

I merged the workaround to get refleak buildbots unstuck for the weekend. I 
bumped the issue stage back to "needs patch" as the available one isn't a 
solution.

--
stage: patch review -> needs patch

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[issue44895] refleak test failure in test_exceptions

[miss-islington]

miss-islington  added the comment:


New changeset ebc59262349d6901b825ed9101d604e826757262 by Miss Islington (bot) 
in branch '3.10':
bpo-44895: Temporarily add an extra gc.collect() call (GH-27746)
https://github.com/python/cpython/commit/ebc59262349d6901b825ed9101d604e826757262


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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

> what is the source of the indeterminism -- some kind of race condition or 
> something else?


My hunch is it could be timing of GC. But it's hard to say at this point.

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[issue44895] refleak test failure in test_exceptions

[miss-islington]

Change by miss-islington :


--
nosy: +miss-islington
nosy_count: 5.0 -> 6.0
pull_requests: +26229
pull_request: https://github.com/python/cpython/pull/27753

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[issue44895] refleak test failure in test_exceptions

[Łukasz Langa]

Łukasz Langa  added the comment:


New changeset 7bf28cbb4bf37fa6bdfc2d3f8a3939066b3f8f22 by Irit Katriel in 
branch 'main':
bpo-44895: Temporarily add an extra gc.collect() call (GH-27746)
https://github.com/python/cpython/commit/7bf28cbb4bf37fa6bdfc2d3f8a3939066b3f8f22


--
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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

It’s not deterministic.

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[issue44895] refleak test failure in test_exceptions

[Chris Jerdonek]

Chris Jerdonek  added the comment:

Out of curiosity, is the failure deterministic in environments where it fails? 
If not, what is the source of the indeterminism -- some kind of race condition 
or something else?

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

My smallest failing example so far:


def test_recursion_in_except_handler(self):

self.test_no_hang_on_context_chain_cycle2()

def set_relative_recursion_limit(n):
depth = 1
while True:
try:
sys.setrecursionlimit(depth)
except RecursionError:
depth += 1
else:
break
sys.setrecursionlimit(depth+n)

def recurse_in_body_and_except():
try:
recurse_in_body_and_except()
except:
recurse_in_body_and_except()

recursionlimit = sys.getrecursionlimit()
try:
set_relative_recursion_limit(10)
try:
recurse_in_body_and_except()
except RecursionError:
pass
else:
self.fail("Should have raised a RecursionError")
finally:
sys.setrecursionlimit(recursionlimit)

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

This fails (test_recursion_normalizing_with_no_memory is not needed):

./python.exe -m test -R 3:3 test_exceptions -m 
test_no_hang_on_context_chain_cycle2 -m 
test_recursion_normalizing_infinite_exception -m 
test_recursion_in_except_handler

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Change by Irit Katriel :


--
keywords: +patch
pull_requests: +26224
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/27746

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

The problem disappears if I add a gc.collect() loop at the beginning of the new 
test:

diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index 79798ecf05..e0aeac9d10 100644
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -1014,6 +1014,7 @@ def cycle():
 
 def test_no_hang_on_context_chain_cycle2(self):
 # See issue 25782. Cycle at head of context chain.
+while gc.collect(): pass
 
 class A(Exception):
 pass

--

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

> I don't know why you need to kill it. It's not a long test.

Ah I see, -F.

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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

STINNER Victor  added the comment:

> I see it on Mac but not windows.

Aha, maybe there is something specific on Mac which triggers an exact code path 
to trigger to bug. I already saw bugs like that.

You can try to play with gc.set_threshold() to change how garbage collection is 
triggered.

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

I don't know why you need to kill it. It's not a long test.

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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

STINNER Victor  added the comment:

> Victor, if the …cycle2 test is hanging then you need the change in PR27626.

That's the commit d5c217475c4957a8084ac3f92ae012ece5edc7cb. My main branch is 
up to date (commit 8ac0886091c27bf4b6bb0a9b571e174b554d31a4), it includes the 
commit d5c217475c4957a8084ac3f92ae012ece5edc7cb.

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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

STINNER Victor  added the comment:

I am not more lucky in the main branch. I ran it for 30 minutes and it didn't 
fail.

$ ./python -m test -R 3:3 test_exceptions -m 
test_no_hang_on_context_chain_cycle2 -m 
test_recursion_normalizing_infinite_exception -m 
test_recursion_in_except_handler -m test_recursion_normalizing_with_no_memory 
-F -j1
(...)
0:31:15 load avg: 1.88 [184] test_exceptions passed
beginning 6 repetitions
123456
..
^C
Kill  process group

== Tests result: INTERRUPTED ==
Test suite interrupted by signal SIGINT.

184 tests OK.

Total duration: 31 min 19 sec
Tests result: INTERRUPTED


I tested commit 8ac0886091c27bf4b6bb0a9b571e174b554d31a4.

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

Victor, if the …cycle2 test is hanging then you need the change in PR27626.

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

Irit Katriel  added the comment:

I see it on Mac but not windows.

Running the test with -v or adding prints makes the leak go away. I’m 
suspecting that one of the recursion tests fails to clear an exception or 
something like that.

Removing any one of the tests makes it stop failing.

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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

STINNER Victor  added the comment:

I fail to reproduce the issue on Linux on the 3.10 branch. I interrupted the 
job after 20 minutes:

$ ./python -m test -R 3:3 test_exceptions -m 
test_no_hang_on_context_chain_cycle2 -m 
test_recursion_normalizing_infinite_exception -m 
test_recursion_in_except_handler -m test_recursion_normalizing_with_no_memory 
-F -j1
(...)
0:21:38 load avg: 2.01 [134] test_exceptions passed
beginning 6 repetitions
123456
..

I tested the commit 5d34ad4e1943a88c9d3aadd300fd0f05dab7.

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[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

Change by STINNER Victor :


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nosy: +vstinner

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[issue44895] refleak test failure in test_exceptions

[Dong-hee Na]

Change by Dong-hee Na :


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nosy: +corona10

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[issue44895] refleak test failure in test_exceptions

[Irit Katriel]

New submission from Irit Katriel :

For background see https://bugs.python.org/issue33930#msg399403


iritkatriel@Irits-MBP cpython % repeat 10 ./python.exe -m test -R 3:3 
test_exceptions -m test_no_hang_on_context_chain_cycle2 -m 
test_recursion_normalizing_infinite_exception -m 
test_recursion_in_except_handler -m test_recursion_normalizing_with_no_memory
0:00:00 load avg: 2.32 Run tests sequentially
0:00:00 load avg: 2.32 [1/1] test_exceptions
beginning 6 repetitions
123456
..

== Tests result: SUCCESS ==

1 test OK.

Total duration: 5.9 sec
Tests result: SUCCESS
0:00:00 load avg: 2.22 Run tests sequentially
0:00:00 load avg: 2.22 [1/1] test_exceptions
beginning 6 repetitions
123456
..

== Tests result: SUCCESS ==

1 test OK.

Total duration: 5.8 sec
Tests result: SUCCESS
0:00:00 load avg: 2.20 Run tests sequentially
0:00:00 load avg: 2.20 [1/1] test_exceptions
beginning 6 repetitions
123456
..

== Tests result: SUCCESS ==

1 test OK.

Total duration: 5.8 sec
Tests result: SUCCESS
0:00:00 load avg: 2.17 Run tests sequentially
0:00:00 load avg: 2.17 [1/1] test_exceptions
beginning 6 repetitions
123456
..
test_exceptions leaked [6, 6, 4] references, sum=16
test_exceptions leaked [6, 6, 4] memory blocks, sum=16
test_exceptions failed (reference leak)

== Tests result: FAILURE ==

1 test failed:
test_exceptions

1 re-run test:
test_exceptions

Total duration: 5.9 sec
Tests result: FAILURE
0:00:00 load avg: 2.08 Run tests sequentially
0:00:00 load avg: 2.08 [1/1] test_exceptions
beginning 6 repetitions
123456
..
test_exceptions leaked [6, 6, 6] references, sum=18
test_exceptions leaked [6, 6, 6] memory blocks, sum=18
test_exceptions failed (reference leak)

== Tests result: FAILURE ==

1 test failed:
test_exceptions

1 re-run test:
test_exceptions

Total duration: 5.8 sec
Tests result: FAILURE
0:00:00 load avg: 2.39 Run tests sequentially
0:00:00 load avg: 2.39 [1/1] test_exceptions
beginning 6 repetitions
123456
..
test_exceptions leaked [6, 6, 6] references, sum=18
test_exceptions leaked [6, 6, 6] memory blocks, sum=18
test_exceptions failed (reference leak)

== Tests result: FAILURE ==

1 test failed:
test_exceptions

1 re-run test:
test_exceptions

Total duration: 6.0 sec
Tests result: FAILURE
0:00:00 load avg: 2.36 Run tests sequentially
0:00:00 load avg: 2.36 [1/1] test_exceptions
beginning 6 repetitions
123456
..
test_exceptions leaked [6, 6, 6] references, sum=18
test_exceptions leaked [6, 6, 6] memory blocks, sum=18
test_exceptions failed (reference leak)

== Tests result: FAILURE ==

1 test failed:
test_exceptions

1 re-run test:
test_exceptions

Total duration: 6.0 sec
Tests result: FAILURE
0:00:00 load avg: 2.31 Run tests sequentially
0:00:00 load avg: 2.31 [1/1] test_exceptions
beginning 6 repetitions
123456
..

== Tests result: SUCCESS ==

1 test OK.

Total duration: 6.3 sec
Tests result: SUCCESS
0:00:00 load avg: 2.20 Run tests sequentially
0:00:00 load avg: 2.20 [1/1] test_exceptions
beginning 6 repetitions
123456
..
test_exceptions leaked [6, 6, 6] references, sum=18
test_exceptions leaked [6, 6, 6] memory blocks, sum=18
test_exceptions failed (reference leak)

== Tests result: FAILURE ==

1 test failed:
test_exceptions

1 re-run test:
test_exceptions

Total duration: 6.1 sec
Tests result: FAILURE
0:00:00 load avg: 2.35 Run tests sequentially
0:00:00 load avg: 2.35 [1/1] test_exceptions

--
components: Interpreter Core
messages: 399424
nosy: iritkatriel
priority: normal
severity: normal
status: open
title: refleak test failure in test_exceptions
versions: Python 3.11

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