New issue 2833: Memory leak with non-exhausted nested generators
https://bitbucket.org/pypy/pypy/issues/2833/memory-leak-with-non-exhausted-nested
František Skála:
When I have nested generators and don't exhaust them fully, memory is not
released properly. I've tried a version with and without closing the generators
manually, but I did not observe any difference.
Tested in an ubuntu 16.04 docker image with just pypy3 installed:
```
#!none
$ pypy3 --version
Python 3.5.3 (fdd60ed87e94, Apr 24 2018, 06:10:04)
[PyPy 6.0.0 with GCC 6.2.0 20160901]
$ uname -a
Linux 60286eff83ae 4.4.0-124-generic #148-Ubuntu SMP Wed May 2 13:00:18 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux
```
The code showing this problem (main.py) while closing the generators manually:
```
#!python
def sample_generator():
yield 3
def nesting_generator():
inner_generator = sample_generator()
try:
for x in inner_generator:
yield x
finally:
inner_generator.close()
def leak():
outer_generator = nesting_generator()
next(outer_generator)
outer_generator.close()
while True:
leak()
```
Command used: `pypy3 main.py`
Expected behaviour:
* memory consumption of the pypy3 process doesn't grow over time
Actual behaviour:
* memory consumption growing rapidly (~250MB increase each second)
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