[issue17998] internal error in regular expression engine

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

For other related issues see issue18672 and issue18684.

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resolution:  -> fixed
stage: test needed -> committed/rejected
status: open -> closed

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[issue17998] internal error in regular expression engine

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

See issue18647.

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[issue17998] internal error in regular expression engine

[Larry Hastings]

Larry Hastings added the comment:

This broke the test suite on all the 32-bit Linux buildbots.  Sample output is 
here:

http://buildbot.python.org/all/builders/x86%20Ubuntu%20Shared%203.x/builds/8349/steps/test/logs/stdio

There's no obvious fix, and I want to cut 3.4a1 right about now, so I'm going 
to tag the version in trunk just before this checkin.

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[issue17998] internal error in regular expression engine

[R. David Murray]

R. David Murray added the comment:

This appears to have turned the buildbots red.

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nosy: +r.david.murray

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[issue17998] internal error in regular expression engine

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Sorry for the delay. I have committed a simple patch which fixes this bug. But 
I don't close the issue still because there are other related issues.

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[issue17998] internal error in regular expression engine

[Roundup Robot]

Roundup Robot added the comment:

New changeset 86b8b035529b by Serhiy Storchaka in branch '3.3':
Issue #17998: Fix an internal error in regular expression engine.
http://hg.python.org/cpython/rev/86b8b035529b

New changeset 36702442ffe0 by Serhiy Storchaka in branch 'default':
Issue #17998: Fix an internal error in regular expression engine.
http://hg.python.org/cpython/rev/36702442ffe0

New changeset e5e425fd1e4f by Serhiy Storchaka in branch '2.7':
Issue #17998: Fix an internal error in regular expression engine.
http://hg.python.org/cpython/rev/e5e425fd1e4f

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nosy: +python-dev

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[issue17998] internal error in regular expression engine

[Larry Hastings]

Larry Hastings added the comment:

I'm downgrading this to "deferred blocker".  I'm sure we'll get it fixed for 
Python 3.4 final, but in the meantime there's no sense in holding up Python 
3.4a1 for it.

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priority: release blocker -> deferred blocker

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[issue17998] internal error in regular expression engine

[Larry Hastings]

Larry Hastings added the comment:

Can I downgrade this to "deferred blocker"?  That means we still need to deal 
with it before the release, but we don't have to hold up Python 3.4a1 for it.

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[issue17998] internal error in regular expression engine

[Cédric Krier]

Changes by Cédric Krier :


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nosy: +ced

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[issue17998] internal error in regular expression engine

[Bohuslav "Slavek" Kabrda]

Changes by Bohuslav "Slavek" Kabrda :


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nosy: +bkabrda

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[issue17998] internal error in regular expression engine

[Larry Hastings]

Larry Hastings added the comment:

There is now a need to rush.  I'm hoping to cut the release in about two days, 
so we can have Python 3.4a1 on time.  Can we resolve this in the next day or 
two?  Sorry for the short notice.

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[issue17998] internal error in regular expression engine

[Doug Hellmann]

Changes by Doug Hellmann :


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[issue17998] internal error in regular expression engine

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I'm working on tests. No need to rush.

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stage: patch review -> test needed

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[issue17998] internal error in regular expression engine

[Matthias Klose]

Matthias Klose added the comment:

what's the status on this one?  Can the proposed patch be applied until the 
decision whether to backout the original change, or not?

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nosy: +doko, georg.brandl, larry
priority: normal -> release blocker

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[issue17998] internal error in regular expression engine

[Antoine Pitrou]

Antoine Pitrou added the comment:

Perhaps it would be safer to revert the original commit in bugfix branches, and 
just commit the better patch in default?

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nosy: +pitrou

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[issue17998] internal error in regular expression engine

[Arfrever Frehtes Taifersar Arahesis]

Changes by Arfrever Frehtes Taifersar Arahesis :


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[issue17998] internal error in regular expression engine

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Thank you Matthew for simpler examples. They helped and I'll use them in the 
tests.

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[issue17998] internal error in regular expression engine

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Here is a patch which should fix this bug. I still have to look for similar 
bugs and write tests.

--
keywords: +patch
stage:  -> patch review
versions: +Python 3.3, Python 3.4
Added file: http://bugs.python.org/file30299/re_unsigned_ptrdiff.patch

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[issue17998] internal error in regular expression engine

[Matthew Barnett]

Matthew Barnett added the comment:

Here are some simpler examples of the bug:

re.compile('.*yz', re.S).findall('xyz')
re.compile('.?yz', re.S).findall('xyz')
re.compile('.+yz', re.S).findall('xyz')

Unfortunately I find it difficult to see what's happening when single-stepping 
through the code because of the macros. :-(

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[issue17998] internal error in regular expression engine

[Christian Heimes]

Christian Heimes added the comment:

I'm able to confirm Benjamin's notes. The regexp works on 64bit Linux but fails 
with a 32bit build:

$ CFLAGS="-m32" LDFLAGS="-m32" ./configure
$ make -j10
$ ./python -c "import re; print(re.compile('(.*)\.[0-9]*\.[0-9]*$', 
re.I|re.S).findall('3.0.0'))"
Traceback (most recent call last):
  File "", line 1, in 
RuntimeError: internal error in regular expression engine

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[issue17998] internal error in regular expression engine

[Benjamin Peterson]

Benjamin Peterson added the comment:

Also, note this particular case only reproduces on 32 bit.

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[issue17998] internal error in regular expression engine

[Christian Heimes]

Changes by Christian Heimes :


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[issue17998] internal error in regular expression engine

[Benjamin Peterson]

Benjamin Peterson added the comment:

27162465316f

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assignee:  -> serhiy.storchaka
nosy: +serhiy.storchaka

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[issue17998] internal error in regular expression engine

[Ezio Melotti]

Changes by Ezio Melotti :


--
components: +Regular Expressions
nosy: +benjamin.peterson, ezio.melotti, mrabarnett
type:  -> behavior

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[issue17998] internal error in regular expression engine

[Jeroen Demeyer]

New submission from Jeroen Demeyer:

On Linux Ubuntu 13.04, i686:

$ uname -a
Linux arando 3.5.0-26-generic #42-Ubuntu SMP Fri Mar 8 23:20:06 UTC 2013 i686 
i686 i686 GNU/Linux

$ python
Python 2.7.5 (default, May 17 2013, 18:43:24) 
[GCC 4.7.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import re
>>> re.compile('(.*)\.[0-9]*\.[0-9]*$', re.I|re.S).findall('3.0.0')
Traceback (most recent call last):
  File "", line 1, in 
RuntimeError: internal error in regular expression engine

This is a 2.7.5 regression, 2.7.4 worked fine.

--
components: Library (Lib)
messages: 189461
nosy: jdemeyer
priority: normal
severity: normal
status: open
title: internal error in regular expression engine
versions: Python 2.7

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