[issue39761] Python 3.9.0a4 fails to build when configured with --with-dtrace

2020-02-26 Thread Marcel Plch


New submission from Marcel Plch :

Steps to reproduce:

$ wget https://www.python.org/ftp/python/3.9.0/Python-3.9.0a4.tar.xz
$ tar xvf Python-3.9.0a4.tar.xz
$ cd Python-3.9.0a4
$ ./configure --with-dtrace
$ make -j12
/usr/bin/ld: libpython3.9.a(ceval.o): in function `_PyEval_EvalFrameDefault':
/home/mplch/Work/fedpkg/Python-3.9.0a4/Python/ceval.c:1117: undefined reference 
to `python_function__entry_semaphore'
/usr/bin/ld: /home/mplch/Work/fedpkg/Python-3.9.0a4/Python/ceval.c:1254: 
undefined reference to `python_line_semaphore'
/usr/bin/ld: /home/mplch/Work/fedpkg/Python-3.9.0a4/Python/ceval.c:3697: 
undefined reference to `python_function__return_semaphore'
/usr/bin/ld: /home/mplch/Work/fedpkg/Python-3.9.0a4/Python/ceval.c:1445: 
undefined reference to `python_line_semaphore'

...

/usr/bin/ld: libpython3.9.a(gcmodule.o):(.note.stapsdt+0x70): undefined 
reference to `python_gc__done_semaphore'
collect2: error: ld returned 1 exit status
make: *** [Makefile:709: Programs/_testembed] Error 1


Additional info:
$ gcc --version
gcc (GCC) 9.2.1 20190827 (Red Hat 9.2.1-1)
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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messages: 362700
nosy: Dormouse759
priority: normal
severity: normal
status: open
title: Python 3.9.0a4 fails to build when configured with --with-dtrace
type: compile error
versions: Python 3.9

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[issue39460] test_zipfile: test_add_file_after_2107() fails on s390x Fedora Rawhide 3.x

2020-01-28 Thread Marcel Plch


Marcel Plch  added the comment:

Is currently anybody actively working on this? Please, report what you have 
found out, if so.
I'd like to start digging into this tomorrow and possibly avoid any duplicit 
work.

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[issue38787] PEP 573: Module State Access from C Extension Methods

2019-11-13 Thread Marcel Plch


Change by Marcel Plch :


--
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pull_request: https://github.com/python/cpython/pull/17145

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[issue38787] PEP 573: Module State Access from C Extension Methods

2019-11-13 Thread Marcel Plch


New submission from Marcel Plch :

Currently, there is not way to access per-module state from the methods of 
types defined in extension modules.

This PEP provides a fix to this issue.

PEP 573 - https://www.python.org/dev/peps/pep-0573/

Reference implementation - 
https://github.com/Dormouse759/cpython/tree/pep-c-rebase_newer

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priority: normal
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title: PEP 573: Module State Access from C Extension Methods
type: enhancement
versions: Python 3.9

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[issue37631] EXTRA_CFLAGS get overrided by CFLAGS_NODIST

2019-07-22 Thread Marcel Plch


Marcel Plch  added the comment:

I believe you mean this downstream issue: 
https://bugzilla.redhat.com/show_bug.cgi?id=1712977

That issue is but only a consequence of a bad flag handling.
The bad flag handling affects not only test_gdb on that specific architecture, 
but the entire optimization level on all architectures, hence causing 
inconveniences in debugging in general on all architectures. It's a pure chance 
that one test caught this specific case.

It might also cause inconveniences with other use-cases for EXTRA_CFLAGS, as 
they might get overridden by CFLAGS_NODIST.

You can get the erroneous output by running the reproducer. That is:

$./configure
...
$ make CFLAGS_NODIST="-O2" EXTRA_CFLAGS="-Og"
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall 
  -Og -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter 
-Wno-missing-field-initializers -Werror=implicit-function-declaration -O2 
-I./Include/internal  -I. -I./Include-DPy_BUILD_CORE -o Programs/python.o 
./Programs/python.c

-Og from EXTRA_CFLAGS gets overridden by -O2 from CFLAGS_NODIST.

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[issue37631] EXTRA_CFLAGS get overrided by CFLAGS_NODIST

2019-07-19 Thread Marcel Plch


New submission from Marcel Plch :

Problem:
If you want to override CFLAGS by setting EXTRA_CFLAGS, they may have no effect 
if there are contrary flags in the CFLAGS_NODIST variable.

How to reproduce:
make CFLAGS_NODIST="-O2" EXTRA_CFLAGS="-Og"

If you look at GCC arguments, there is -O2 present *after* the -Og flag. This 
means -Og gets ignored.

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status: open
title: EXTRA_CFLAGS get overrided by CFLAGS_NODIST
type: behavior
versions: Python 3.7, Python 3.8, Python 3.9

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[issue34566] pipe read sometimes returns EOF but returncode is still None

2018-09-03 Thread Marcel Plch


Change by Marcel Plch :


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[issue34566] pipe read sometimes returns EOF but returncode is still None

2018-09-03 Thread Marcel Plch


Marcel Plch  added the comment:

original downstream issue - https://bugzilla.redhat.com/show_bug.cgi?id=1623070

--
title: pipe read sometimmes returns EOF but returncode is still None -> pipe 
read sometimes returns EOF but returncode is still None

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[issue34566] pipe read sometimmes returns EOF but returncode is still None

2018-09-03 Thread Marcel Plch


New submission from Marcel Plch :

TL;DR: For reproducer, please see attached file and the end of this description 
for a runner script.

It seems that when pipe is being read it has a chance of returning EOF and not 
setting the return code.
This bug affects all (or at least a broad set of) architectures and is present 
in all versions. (2.7 and 3.8 were tested).
This bug is not reproducible when configured using --with-pydebug flag.
As a result, any code relying on proper setting of the returncode attribute 
might (and probably is going to) fail.
---
$ for i in $(seq 1 1000); do ./python script.py; done | grep poll | sort | uniq 
-c

Actual output:
630 output: '', return code: 0, pollstatus=0
370 output: '', return code: None, pollstatus=None

Expected output:
1000 output: '', return code: 0, pollstatus=0

--
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files: script.py
messages: 324508
nosy: Dormouse759
priority: normal
severity: normal
status: open
title: pipe read sometimmes returns EOF but returncode is still None
versions: Python 3.8
Added file: https://bugs.python.org/file47782/script.py

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[issue34097] ZIP does not support timestamps before 1980

2018-08-10 Thread Marcel Plch


Change by Marcel Plch :


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[issue34325] test_zipfile gets OverflowError in multiple buildbots

2018-08-03 Thread Marcel Plch


Change by Marcel Plch :


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[issue34097] ZIP does not support timestamps before 1980

2018-08-02 Thread Marcel Plch


Marcel Plch  added the comment:

It seems reasonable, I'll have a look at it.

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[issue34097] ZIP does not support timestamps before 1980

2018-07-13 Thread Marcel Plch


Marcel Plch  added the comment:

I have created a PR for this: https://github.com/python/cpython/pull/8270

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[issue34097] ZIP does not support timestamps before 1980

2018-07-13 Thread Marcel Plch


Change by Marcel Plch :


--
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pull_requests: +7805
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[issue34097] ZIP does not support timestamps before 1980

2018-07-11 Thread Marcel Plch


Marcel Plch  added the comment:

I'm going to have a closer look at this and try to add the option.

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[issue32962] test_gdb fails in debug build with `-mcet -fcf-protection -O0`

2018-06-19 Thread Marcel Plch


Marcel Plch  added the comment:

> It's already done, no? But the title issue is "-mcet -fcf-protection
> -O0" and -O0 disables optimizations.

Some of the simple tests are still run even with optimizations.
Disabled optimizations is what we want, because then the function doesn't get 
inlined --> the 'next' jumps in, not out.

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[issue32962] test_gdb fails in debug build with `-mcet -fcf-protection -O0`

2018-06-18 Thread Marcel Plch


Marcel Plch  added the comment:

The problem is with this function:
static PyObject *
builtin_id(PyModuleDef *self, PyObject *v)
/*[clinic end generated code: output=0aa640785f697f65 input=5a534136419631f4]*/
{
return PyLong_FromVoidPtr(v);
}

It's a one-liner, so the compiler really likes to inline it.

Without the inline optimization, the additional "next" command makes a jump 
into the function.

But when the function is inlined and you set a breakpoint to it, the line is 
just seen as a function from the debugger, that means you already are inside 
and the "next" makes the debugger exit this line, and so the function.

More graphical explanation:
non-inline case:
br
{
next
   return PyLong_FromVoidPtr(v);

inline case:
br
   return PyLong_FromVoidPtr(v);
next
"Some code without access to the func arguments' debug symbols"


I propose two possible solutions:
1) Skip whole test_gdb when optimizations are used (who debugs with them 
anyway?)
2) Conditionalize the "next". (this could be hard as we would need to know when 
the function is inlined)

Also, I have found out that when configured with --with-pydebug and 
--enable-optimizations, tests stop to fail. (the failing bots are configuring 
with --enable-optimizations only)

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[issue30345] test_gdb fails on Python 3.6 when built with LTO+PGO

2018-06-15 Thread Marcel Plch


Change by Marcel Plch :


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[issue30345] test_gdb fails on Python 3.6 when built with LTO+PGO

2018-06-15 Thread Marcel Plch


Marcel Plch  added the comment:

Those -g switches you see there are during compile-time.
For this to work, you need to enable it also during link/time:
./configure --enable-optimizations --with-lto LDFLAGS="-g"

Except for py-bt, you should also try bt. With this link flag enabled, I can 
observe significant slowdown on my machine during the backtrace when using bt 
command (At least when I let the PGO do all the profiling, when compiled with 
the sed edit you posted here, I observe none).

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[issue30345] test_gdb fails on Python 3.6 when built with LTO+PGO

2018-06-15 Thread Marcel Plch


Marcel Plch  added the comment:

Yes, but that is not a fix really in this case.
While it makes the test pass because it 'correctly' prints out unknown objects, 
it makes no real difference when actually debugging. The -g switch at link time 
makes the debug symbols readable and user is able to debug just as usual.

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[issue30345] test_gdb fails on Python 3.6 when built with LTO+PGO

2018-06-15 Thread Marcel Plch


Marcel Plch  added the comment:

LTO may break the debug symbols and make GDB unusable.
There is an option, that fixes the issue: to use a -g switch in link flags.
Note that this slows loading of the debug symbols significantly.

I suggest these options as possible approaches:

1) make the configure script include -g in LDFLAGS when --enable-optimizations 
and --with-lto are used

2) same as 1), but only when --with-pydebug is also used.

3) document this problem and make the user aware that this possible fix (-g in 
link flags) exists

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[issue32374] Document that m_traverse for multi-phase initialized modules can be called with m_state=NULL

2018-05-28 Thread Marcel Plch

Change by Marcel Plch <gmarcel.p...@gmail.com>:


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[issue32962] test_gdb fails in debug build with `-mcet -fcf-protection -O0`

2018-05-10 Thread Marcel Plch

Change by Marcel Plch <gmarcel.p...@gmail.com>:


--
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pull_requests: +6441
stage:  -> patch review

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[issue29673] Some gdb macros are broken in 3.6

2018-03-16 Thread Marcel Plch

Marcel Plch <gmarcel.p...@gmail.com> added the comment:

I have created a PR here - https://github.com/python/cpython/pull/6126

The problem was, indeed, change in the code structure. The macro checked for 
presence inside of PyEval_EvalFrame() using address of a neighbouring function.
Also, arguments to PyEval_EvalFrame() were changed, so the macro responsible 
for printing of the frame needed a little tweak.

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[issue29673] Some gdb macros are broken in 3.6

2018-03-16 Thread Marcel Plch

Change by Marcel Plch <gmarcel.p...@gmail.com>:


--
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[issue32374] Document that m_traverse for multi-phase initialized modules can be called with m_state=NULL

2018-01-09 Thread Marcel Plch

Marcel Plch <gmarcel.p...@gmail.com> added the comment:

I have created a PR at https://github.com/python/cpython/pull/5140
It contains documentation, plus, in --with-pydebug mode, it calls m_traverse to 
catch easy cases of not handling the m_state==NULL case early.

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[issue32374] Document that m_traverse for multi-phase initialized modules can be called with m_state=NULL

2018-01-09 Thread Marcel Plch

Change by Marcel Plch <gmarcel.p...@gmail.com>:


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[issue32374] Document that m_traverse for multi-phase initialized modules can be called with m_state=NULL

2017-12-19 Thread Marcel Plch

Change by Marcel Plch <gmarcel.p...@gmail.com>:


--
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[issue6531] atexit_callfuncs() crashing within Py_Finalize() when using multiple interpreters.

2017-12-11 Thread Marcel Plch

Marcel Plch <gmarcel.p...@gmail.com> added the comment:

> At a guess, the problem is because in atexit_callfuncs():
> 
>module = PyState_FindModule();
>if (module == NULL)
>return;

In #31901, I solved this problem by getiing rid of PyState_FindModule in the 
atexit code, using module state and PEP-489 multiphase initialization.

This needed some changes in the pystate and pylifecycle code, so the specific 
interpreter has a reference to its own atexit module. This way, 
Py_EndInterpreter() is able to call the callbacks for the given interpreter.

See: https://github.com/python/cpython/pull/4611

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[issue31901] atexit callbacks should be run at subinterpreter shutdown

2017-12-04 Thread Marcel Plch

Marcel Plch <gmarcel.p...@gmail.com> added the comment:

I created a PR with fix on this issue - 
https://github.com/python/cpython/pull/4611

This makes Py_EndInterpreter() call atexit callbacks for the subinterpreter it 
is destroying.

It doesn't make Py_Finalize() end all subinterpreters, as the current 
implementation of subinterpreters makes it hard to do so. This is the same as 
the current behaviour: you need to end all subinterpreters before calling 
Py_Finalize().

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[issue31901] atexit callbacks should be run at subinterpreter shutdown

2017-11-28 Thread Marcel Plch

Change by Marcel Plch <gmarcel.p...@gmail.com>:


--
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[issue31901] atexit callbacks only called for current subinterpreter

2017-10-30 Thread Marcel Plch

New submission from Marcel Plch <gmarcel.p...@gmail.com>:

`Py_FinalizeEx()` only executes callbacks from the subinterpreter from which 
Py_FinalizeEx is called.

What is the expected behavior here?
Should the callbacks be specific to individual subinterpreters?

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nosy: Dormouse759, encukou, ncoghlan
priority: normal
severity: normal
status: open
title: atexit callbacks only called for current subinterpreter
type: behavior
versions: Python 3.7

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[issue31862] Port the standard library to PEP 489 multiphase initialization

2017-10-24 Thread Marcel Plch

Change by Marcel Plch <gmarcel.p...@gmail.com>:


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[issue31862] Port the standard library to PEP 489 multiphase initialization

2017-10-24 Thread Marcel Plch

New submission from Marcel Plch <gmarcel.p...@gmail.com>:

PEP 489 introduced multiphase initialization of extension and built-in modules.
Now, almost no module in the standard library supports this feature. This 
should be improved to prepare Python for better testing of subinterpreters.

Many benefits of PEP 489 don't apply to stdlib modules. However, the PEP 
effectively says that by using multi-phase init, the module author "promises" 
that the module is "subinterpreter-friendly" [0]. So, when porting, each module 
should be checked that it e.g. doesn't use mutable process-global state.

I'd like to port stdlib to multi-phase init, starting with the easier modules, 
to:
- get familiar with contributing to CPython,
- check and track which modules are already "subinterpreter-friendly", and
- figure out how and where PEP 489 is lacking (beyond what is discussed in 
the PEP itself).


[0]: 
https://www.python.org/dev/peps/pep-0489/#subinterpreters-and-interpreter-reloading

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title: Port the standard library to PEP 489 multiphase initialization
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[issue30403] PEP 547: Running extension modules using -m switch

2017-09-08 Thread Marcel Plch

Marcel Plch added the comment:

I have made a patch both for cython and cpython implementing a way to use 
Py_mod_create in cython.

Basically module def that specifies a new "Py_mod_cython" slot are excluded 
from the rule of no module creation, so these modules can be executed directly 
even though they specify Py_mod_create.

Is this approach safe or does it make easy for things to go wrong?

cpython - 
https://github.com/Traceur759/cpython/commit/51a7508d176b23dcf3547b970cf7e6a50898aae2

cython - 
https://github.com/Traceur759/cython/commit/2ca706e10f469cd38947eecd8b92c142532b20bc

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[issue30403] PEP 547: Running extension modules using -m switch

2017-09-01 Thread Marcel Plch

Marcel Plch added the comment:

Sorry for not responding for so long, I didn't work on Python through the 
summer because of some other matters.

Re-execution of the module is not possible, because there is a check on the C 
level, If you call exec_in_module() on an already initialized module, it'll 
raise ImportError.

Also, because of this check, there is the restriction for py_mod_create. 
"Modules" defining this slot might not be module objects at all, so they might 
not have the module state pointer (which is used to flag if the module was 
initialized).

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[issue19717] resolve() fails when the path doesn't exist

2017-05-28 Thread Marcel Plch

Changes by Marcel Plch <gmarcel.p...@gmail.com>:


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[issue30403] Running extension modules using -m switch

2017-05-23 Thread Marcel Plch

Changes by Marcel Plch <gmarcel.p...@gmail.com>:


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pull_requests: +1845

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[issue30403] Running extension modules using -m switch

2017-05-19 Thread Marcel Plch

New submission from Marcel Plch:

Currently the -m switch does not work with extension modules:

$ python3 -m math

/usr/bin/python3: No code object available for math


In order to enable extension modules to behave like Python source modules,
the -m switch should be supported.

Please, see this proof of concept:
https://github.com/Traceur759/cpython/tree/main_c_modules

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components: Extension Modules
messages: 293954
nosy: Dormouse759
priority: normal
severity: normal
status: open
title: Running extension modules using -m switch
type: enhancement
versions: Python 3.7

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[issue30177] pathlib.resolve(strict=False) only includes first child

2017-05-18 Thread Marcel Plch

Changes by Marcel Plch <gmarcel.p...@gmail.com>:


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