[issue33312] ubsan undefined behavior sanitizer flags struct _dictkeysobject (PyDictKeysObj)

[miss-islington]

Change by miss-islington :


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[issue33312] ubsan undefined behavior sanitizer flags struct _dictkeysobject (PyDictKeysObj)

[miss-islington]

Change by miss-islington :


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[issue33312] ubsan undefined behavior sanitizer flags struct _dictkeysobject (PyDictKeysObj)

[Gregory P. Smith]

Gregory P. Smith  added the comment:


New changeset 397f1b28c4a12e3b3ed59a89599eabc457412649 by Gregory P. Smith in 
branch 'master':
bpo-33312: Fix clang ubsan out of bounds warnings in dict. (GH-6537)
https://github.com/python/cpython/commit/397f1b28c4a12e3b3ed59a89599eabc457412649


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[issue991266] Cookie.py does not correctly quote Morsels

[Alex Gaynor]

Alex Gaynor  added the comment:

None of the above :-) I'd expect the last one, but with quoting.

You should not be able to set fields in a cookie by injection.

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[issue991266] Cookie.py does not correctly quote Morsels

[Berker Peksag]

Berker Peksag  added the comment:

>>> from http.cookies import SimpleCookie
>>> c = SimpleCookie()
>>> c['name'] = 'value'
>>> c['name']['comment'] = '\n'
>>> c['name']['expires'] = '123; path=.example.invalid'
'Set-Cookie: name=value; Comment="\\012"; expires=123; path=.example.invalid'

What do you think that the snippet above should return?

'Set-Cookie: name=value; Comment="\\012"; expires=Fri, 20 Apr 2018 02:03:13 
GMT; path=.example.invalid'

or

'Set-Cookie: name=value; Comment="\\012"; expires=Fri, 20 Apr 2018 02:03:13 
GMT; path=".example.invalid"'

or

'Set-Cookie: name=value; Comment="\\012"; expires=123; 
path=".example.invalid"'

?

I don't think the path attribute (or all of them) needs to be quoted 
unconditionally. Looking at https://tools.ietf.org/html/rfc6265#section-4.1.1, 
it looks like quoting for cookie-value is optional.

Is there a use case or examples from other programming languages you can share 
with us?

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versions: +Python 3.7, Python 3.8 -Python 3.4, Python 3.5

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[issue991266] Cookie.py does not correctly quote Morsels

[Mark Williams]

Mark Williams  added the comment:

This patch only quotes the Comment attribute, and the rest of the code only 
quotes attributes if they're of the expected type.  Consider Expires:

>>> from http.cookies import SimpleCookie
>>> c = SimpleCookie()
>>> c['name'] = 'value'
>>> c['name']['comment'] = '\n'
>>> c['name']['expires'] = 123
>>> c.output()
'Set-Cookie: name=value; Comment="\\012"; expires=Fri, 20 Apr 2018 02:03:13 GMT'
>>> c['name']['expires'] = '123; path=.example.invalid'
'Set-Cookie: name=value; Comment="\\012"; expires=123; path=.example.invalid'

Here's the offending line:

https://github.com/python/cpython/blob/b87c1c92fc93c5733cd3d8606ab2301ca6ba208f/Lib/http/cookies.py#L415

Why not quote all attribute values?

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[issue33283] Mention PNG as a supported image format by Tcl/Tk

[Andrés Delfino]

Change by Andrés Delfino :


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[issue33316] PyThread_release_lock always fails

[Ivan Pozdeev]

Change by Ivan Pozdeev :


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[issue33316] PyThread_release_lock always fails

[Ivan Pozdeev]

New submission from Ivan Pozdeev :

In win7 x64 debug mode with thread_debug=1, every PyThread_release_lock() is 
accompanied with a message on stderr:

Could not PyThread_release_lock() error: 0

--
components: Interpreter Core, Windows
messages: 315497
nosy: Ivan.Pozdeev, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: PyThread_release_lock always fails
type: behavior
versions: Python 3.6, Python 3.7, Python 3.8

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[issue991266] Cookie.py does not correctly quote Morsels

[Alex Gaynor]

Alex Gaynor  added the comment:

Berker your patch looks good to me.

Convert it to a PR and then merge?

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[issue29319] Embedded 3.6.0 distribution cannot run pyz files

[Barry A. Warsaw]

Change by Barry A. Warsaw :


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[issue33312] ubsan undefined behavior sanitizer flags struct _dictkeysobject (PyDictKeysObj)

[Benjamin Peterson]

Benjamin Peterson  added the comment:

I was fixing strict aliasing problems in the code and I thought the union was 
cleaner than a bunch of casts.

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[issue33312] ubsan undefined behavior sanitizer flags struct _dictkeysobject (PyDictKeysObj)

[Gregory P. Smith]

Gregory P. Smith  added the comment:

My PR is almost a revert of 
https://github.com/python/cpython/commit/186122ead26f3ae4c2bc9f6715d2a29d339fdc5a
 so I'm curious what your motivation behind that change to use the union was?

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[issue33312] ubsan undefined behavior sanitizer flags struct _dictkeysobject (PyDictKeysObj)

[Gregory P. Smith]

Gregory P. Smith  added the comment:

I'm going to see what appveyor says with the VLA code on the PR.  I've updated 
it to use char[].

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[issue33312] ubsan undefined behavior sanitizer flags struct _dictkeysobject (PyDictKeysObj)

[Gregory P. Smith]

Gregory P. Smith  added the comment:

By my reading on how strict aliasing works, I think just changing the 
int64_t[1] or int32_t[1] in my PR to char[1] will work as char is always 
assumed to alias?

the clang ubsan i was testing my PR against wasn't warning me about strict 
aliasing. :/

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[issue33312] ubsan undefined behavior sanitizer flags struct _dictkeysobject (PyDictKeysObj)

[Benjamin Peterson]

Benjamin Peterson  added the comment:

Your PR is basically what we did prior to 
186122ead26f3ae4c2bc9f6715d2a29d339fdc5a. The problem is that may run afoul of 
different UB, namely strict aliasing. (Though, I suppose we could probably also 
avoid that by making dk_indices char[].)

If VLAs work with whatever MSVC we're using, it seems fine to add it to PEP 7. 
At worst, we can #ifdef sanitizer it.

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[issue24318] Better documentaiton of profile-opt (and release builds in general?)

[miss-islington]

Change by miss-islington :


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[issue24318] Better documentaiton of profile-opt (and release builds in general?)

[miss-islington]

Change by miss-islington :


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[issue24318] Better documentaiton of profile-opt (and release builds in general?)

[Gregory P. Smith]

Gregory P. Smith  added the comment:

FYI - The test suite minus some of the crazier tests (multiprocessing) that the 
makefile uses today is the recommended workload and is effectively what linux 
distros I've looked at use.

It is a myth that the specific application workload matters a great deal for 
building a Python PGO interpreter.  The layer of indirection provided by an 
interpreter makes it easier.  All you really need is code that exercises the 
major important C speed paths.  The eval loop, unicode internals, long bignum 
internals, marshal, re, pickle, json, xml, and cdecimal are all well exercised 
by running the test suite.

A specific Python application's actual logic is not going to exercise the 
internals of those in a meaningfully different manner.

Performance experiments bear this out.

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[issue24318] Better documentaiton of profile-opt (and release builds in general?)

[Gregory P. Smith]

Change by Gregory P. Smith :


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[issue33312] ubsan undefined behavior sanitizer flags struct _dictkeysobject (PyDictKeysObj)

[Gregory P. Smith]

Change by Gregory P. Smith :


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[issue33312] ubsan undefined behavior sanitizer flags struct _dictkeysobject (PyDictKeysObj)

[Gregory P. Smith]

Gregory P. Smith  added the comment:

notably, C99 variable length arrays syntax is not mentioned as allowed in 
https://www.python.org/dev/peps/pep-0007/.  If we want to use VLAs, that should 
be clarified.  But both our solutions should work with [1] instead of [] which 
is allowed by the ubsan checker.

it means keeping the annoying "- Py_MEMBER_SIZE(...)" of the array on all size 
calculations (but because of that the patch is smaller).

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https://bugs.python.org/file47543/maybe-less-horrible-no-vla-gps02.patch

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[issue33312] ubsan undefined behavior sanitizer flags struct _dictkeysobject (PyDictKeysObj)

[INADA Naoki]

Change by INADA Naoki :


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[issue33315] Allow queue.Queue to be used in type annotations

[Semyon Proshev]

New submission from Semyon Proshev :

from queue import Queue

a: Queue[int]

This code throws a TypeError in runtime.
But its pyi stub allows to use it in such a way 
(https://github.com/python/typeshed/blob/master/stdlib/3/queue.pyi)

I'd suggest to update classes in queue module to allow them to be used in type 
annotations.

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components: Library (Lib)
messages: 315488
nosy: sproshev
priority: normal
severity: normal
status: open
title: Allow queue.Queue to be used in type annotations
versions: Python 3.5, Python 3.6, Python 3.7, Python 3.8

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[issue31463] test_multiprocessing_fork hangs test_subprocess

[Miro Hrončok]

Miro Hrončok  added the comment:

Sorry, I've pressed the button before finishing the thought.

...so this might or might not be relevant to what you observe with master and 
originally reported.

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[issue31463] test_multiprocessing_fork hangs test_subprocess

[Miro Hrončok]

Miro Hrončok  added the comment:

This started to bother us in Fedora for various Python versions, so chances are 
something changed on the system level.

However for us it seams test_multiprocessing_fork hangs by itself, so this 
might or might not be relevant to 


# python3.7 -m test.regrtest test_multiprocessing_fork test_subprocess
Run tests sequentially
0:00:00 load avg: 1.16 [1/2] test_multiprocessing_fork
/usr/lib64/python3.7/multiprocessing/semaphore_tracker.py:55: UserWarning: 
semaphore_tracker: process died unexpectedly, relaunching.  Some semaphores 
might leak.
  warnings.warn('semaphore_tracker: process died unexpectedly, '
Exception in thread Thread-26:
Traceback (most recent call last):
  File "/usr/lib64/python3.7/threading.py", line 917, in _bootstrap_inner
self.run()
  File "/usr/lib64/python3.7/threading.py", line 865, in run
self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.7/multiprocessing/resource_sharer.py", line 139, in 
_serve
signal.pthread_sigmask(signal.SIG_BLOCK, range(1, signal.NSIG))
  File "/usr/lib64/python3.7/signal.py", line 60, in pthread_sigmask
sigs_set = _signal.pthread_sigmask(how, mask)
ValueError: signal number 32 out of range

(hangs)

^CProcess Process-184:
Traceback (most recent call last):
  File "/usr/lib64/python3.7/multiprocessing/process.py", line 297, in 
_bootstrap
self.run()
  File "/usr/lib64/python3.7/multiprocessing/process.py", line 99, in run
self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.7/test/_test_multiprocessing.py", line 3328, in 
child_access
w = conn.recv()
  File "/usr/lib64/python3.7/multiprocessing/connection.py", line 251, in recv
return _ForkingPickler.loads(buf.getbuffer())
  File "/usr/lib64/python3.7/multiprocessing/connection.py", line 960, in 
rebuild_connection
fd = df.detach()
  File "/usr/lib64/python3.7/multiprocessing/resource_sharer.py", line 57, in 
detach
with _resource_sharer.get_connection(self._id) as conn:
  File "/usr/lib64/python3.7/multiprocessing/resource_sharer.py", line 87, in 
get_connection
c = Client(address, authkey=process.current_process().authkey)
  File "/usr/lib64/python3.7/multiprocessing/connection.py", line 498, in Client
answer_challenge(c, authkey)
  File "/usr/lib64/python3.7/multiprocessing/connection.py", line 741, in 
answer_challenge
message = connection.recv_bytes(256) # reject large message
  File "/usr/lib64/python3.7/multiprocessing/connection.py", line 216, in 
recv_bytes
buf = self._recv_bytes(maxlength)
  File "/usr/lib64/python3.7/multiprocessing/connection.py", line 407, in 
_recv_bytes
buf = self._recv(4)
  File "/usr/lib64/python3.7/multiprocessing/connection.py", line 379, in _recv
chunk = read(handle, remaining)
KeyboardInterrupt
Warning -- multiprocessing.process._dangling was modified by 
test_multiprocessing_fork
  Before: <_weakrefset.WeakSet object at 0x7f4b63782dd8>
  After:  <_weakrefset.WeakSet object at 0x7f4b637821d0> 
Warning -- threading._dangling was modified by test_multiprocessing_fork
  Before: <_weakrefset.WeakSet object at 0x7f4b63782780>
  After:  <_weakrefset.WeakSet object at 0x7f4b63782da0> 

Test suite interrupted by signal SIGINT.
2 tests omitted:
test_multiprocessing_fork test_subprocess

Total duration: 1 min 35 sec
Tests result: INTERRUPTED

# python3.7 --version
Python 3.7.0b3


# python3.6 -m test.regrtest test_multiprocessing_fork test_subprocess
Run tests sequentially
0:00:00 load avg: 1.84 [1/2] test_multiprocessing_fork
/usr/lib64/python3.6/multiprocessing/semaphore_tracker.py:55: UserWarning: 
semaphore_tracker: process died unexpectedly, relaunching.  Some semaphores 
might leak.
  warnings.warn('semaphore_tracker: process died unexpectedly, '
Exception in thread Thread-20:
Traceback (most recent call last):
  File "/usr/lib64/python3.6/threading.py", line 916, in _bootstrap_inner
self.run()
  File "/usr/lib64/python3.6/threading.py", line 864, in run
self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.6/multiprocessing/resource_sharer.py", line 139, in 
_serve
signal.pthread_sigmask(signal.SIG_BLOCK, range(1, signal.NSIG))
  File "/usr/lib64/python3.6/signal.py", line 60, in pthread_sigmask
sigs_set = _signal.pthread_sigmask(how, mask)
ValueError: signal number 32 out of range

(hangs)

^CProcess Process-178:
Traceback (most recent call last):
...
KeyboardInterrupt
Warning -- multiprocessing.process._dangling was modified by 
test_multiprocessing_fork
  Before: <_weakrefset.WeakSet object at 0x7f1873917c88>
  After:  <_weakrefset.WeakSet object at 0x7f188516d978> 
Warning -- threading._dangling was modified by test_multiprocessing_fork
  Before: <_weakrefset.WeakSet object at 0x7f1873917d68>
  After:  <_weakrefset.WeakSet object at 0x7f1873917e48> 

Test suite interrupted by signal SIGINT.
2 tests omitted:
test_multiprocessing_fork test_subprocess

Total duration: 51 sec

[issue24882] ThreadPoolExecutor doesn't reuse threads until #threads == max_workers

[INADA Naoki]

INADA Naoki  added the comment:

Why not just remove TODO comment?
Thread is cheap, but not zero-cost.

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[issue26153] PyImport_GetModuleDict: no module dictionary! when `__del__` triggers a warning

[Thomas Wouters]

Change by Thomas Wouters :


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[issue32591] Deprecate sys.set_coroutine_wrapper and replace it with more focused API(s)

[Thomas Wouters]

Change by Thomas Wouters :


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[issue26153] PyImport_GetModuleDict: no module dictionary! when `__del__` triggers a warning

[Nathaniel Smith]

Change by Nathaniel Smith :


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[issue24318] Better documentaiton of profile-opt (and release builds in general?)

[Joachim Wagner]

Joachim Wagner  added the comment:

The readme in 3.6.5 has a section on PGO but the sentence "If ran,
``make profile-opt`` will do several steps." can be misunderstood that one has 
to run this command instead of "make" after "configure --enable-optimizations". 
Furthermore, a 2015 post suggests that most Linux distributions use a different 
workload than the one provided for much better results. The readme should talk 
about this, either clarifying that this issue has been resolved or making 
recommendations for the workload. (I understand that licence incompatibilities 
or the size of the workload may be reasons for not including the recommended 
workload in the source distribution.)

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[issue33189] pygettext doesn't work with f-strings

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue33189] pygettext doesn't work with f-strings

[miss-islington]

miss-islington  added the comment:


New changeset 6f870935c2e024cbd1cc379f85e6a66d7711dcc7 by Miss Islington (bot) 
in branch '3.6':
bpo-33189: pygettext.py now accepts only literal strings (GH-6364)
https://github.com/python/cpython/commit/6f870935c2e024cbd1cc379f85e6a66d7711dcc7


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[issue33189] pygettext doesn't work with f-strings

[miss-islington]

Change by miss-islington :


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[issue33189] pygettext doesn't work with f-strings

[miss-islington]

miss-islington  added the comment:


New changeset a4fb580f701df5bf07ce569a4f43abfb05c92759 by Miss Islington (bot) 
in branch '3.7':
bpo-33189: pygettext.py now accepts only literal strings (GH-6364)
https://github.com/python/cpython/commit/a4fb580f701df5bf07ce569a4f43abfb05c92759


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[issue33189] pygettext doesn't work with f-strings

[miss-islington]

Change by miss-islington :


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[issue33189] pygettext doesn't work with f-strings

[miss-islington]

Change by miss-islington :


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[issue33189] pygettext doesn't work with f-strings

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:


New changeset 69524821a87251b7aee966f6e46b3810ff5aaa64 by Serhiy Storchaka in 
branch 'master':
bpo-33189: pygettext.py now accepts only literal strings (GH-6364)
https://github.com/python/cpython/commit/69524821a87251b7aee966f6e46b3810ff5aaa64


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[issue33308] parser.st2list(..., col_info=True) triggers a SystemError

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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status: open -> closed

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[issue33308] parser.st2list(..., col_info=True) triggers a SystemError

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:


New changeset d988c0b6bd1c5965fdc51428119e9104211e688f by Serhiy Storchaka in 
branch '2.7':
[2.7] bpo-33308: Fix a crash in the parser module when convert an ST object. 
(GH-6519) (GH-6532)
https://github.com/python/cpython/commit/d988c0b6bd1c5965fdc51428119e9104211e688f


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