[issue24482] itertools.tee causes segfault in a multithreading environment, while the equivalent implementation doesn't

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

I can also reproduce the original script's segfault in 2.7 but not in master. 
There is a related bug as per the original description by Dmitry that 
itertools.tee is not thread safe in https://bugs.python.org/msg323817 and a 
related SO answer to this that will add some context 
https://stackoverflow.com/a/44638570/2610955

Thanks

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[issue24482] itertools.tee causes segfault in a multithreading environment, while the equivalent implementation doesn't

[Xiang Zhang]

Change by Xiang Zhang :


--
resolution:  -> duplicate
stage: needs patch -> resolved
status: open -> closed
superseder:  -> itertools.tee not thread-safe; can segfault interpreter when 
wrapped iterator releases GIL

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[issue24482] itertools.tee causes segfault in a multithreading environment, while the equivalent implementation doesn't

[Raymond Hettinger]

Raymond Hettinger added the comment:

 Is it expected?

No, it is a bug.

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[issue24482] itertools.tee causes segfault in a multithreading environment, while the equivalent implementation doesn't

[Dmitry Odzerikho]

Changes by Dmitry Odzerikho dmitry.odzeri...@gmail.com:


Added file: http://bugs.python.org/file39757/test_segfault.py

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[issue24482] itertools.tee causes segfault in a multithreading environment, while the equivalent implementation doesn't

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I can't reproduce the crash in 3.3+ (this doesn't matter the bug is gone), but 
can reproduce in 2.7 and 3.2. Here is a reproducer that compatible with 2.7 and 
3.x.

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Added file: http://bugs.python.org/file39762/test_segfault.py

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[issue24482] itertools.tee causes segfault in a multithreading environment, while the equivalent implementation doesn't

[Serhiy Storchaka]

Changes by Serhiy Storchaka storch...@gmail.com:


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nosy: +serhiy.storchaka

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[issue24482] itertools.tee causes segfault in a multithreading environment, while the equivalent implementation doesn't

[Dmitry Odzerikho]

New submission from Dmitry Odzerikho:

Hi,

I'm using iterators returned by itertools.tee in different threads. The 
original iterator passed to itertools.tee is thread-safe, however, it doesn't 
guarantees that the cloned iterators are thread safe too. However the 
equivalent implementation of itertools.tee in pure Python seems to work fine in 
this case. Is it expected or I'm doing something wrong?

I'm attaching a simple example that shows the behaviour.

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title: itertools.tee causes segfault in a multithreading environment, while the 
equivalent implementation does'nt - itertools.tee causes segfault in a 
multithreading environment, while the equivalent implementation doesn't
Added file: http://bugs.python.org/file39756/test_segfault.py

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[issue24482] itertools.tee causes segfault in a multithreading environment, while the equivalent implementation doesn't

[Dmitry Odzerikho]

Changes by Dmitry Odzerikho dmitry.odzeri...@gmail.com:


Removed file: http://bugs.python.org/file39756/test_segfault.py

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[issue24482] itertools.tee causes segfault in a multithreading environment, while the equivalent implementation doesn't

[Ezio Melotti]

Changes by Ezio Melotti ezio.melo...@gmail.com:


--
nosy: +rhettinger
stage:  - needs patch

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