Issue 1072259: re module segfaulting in large regular expression (original) (raw)

Created on 2004-11-24 03:38 by edemaine, last changed 2022-04-11 14:56 by admin. This issue is now closed.

Files
File name Uploaded Description Edit
test2.py edemaine,2004-11-24 03:38 offending code sample
test2.py edemaine,2004-11-30 23:57 more offending code sample
sre.patch niemeyer,2004-12-02 16:20 Patch
Messages (5)
msg23290 - (view) Author: Erik Demaine (edemaine) Date: 2004-11-24 03:38
The attached code worked fine in Python 2.3 and prior, but broke in a recent version of Python 2.4 (I think between the alpha and beta, but I'm not sure). It now causes a Segmentation fault, at least on my Linux boxes (2.4.18 and 2.4.22). For those not looking at the attachment, the code is essentially: import re re.match (...big regular expression..., 'December 20, 1997', re.IGNORECASE) The code works if the re.IGNORECASE flag is omitted. I hope I'm not doing anything stupid in installation... I tried both CVS head and 2.4c1, both with-pyalloc and without-pyalloc.
msg23291 - (view) Author: Erik Demaine (edemaine) Date: 2004-11-24 03:40
Logged In: YES user_id=265183 An update: The same code crashes (general protection fault) on a vanilla install of 2.4c1 on Windows XP using the MSI installer. So I don't think it's my installation.
msg23292 - (view) Author: Erik Demaine (edemaine) Date: 2004-11-30 23:57
Logged In: YES user_id=265183 FYI, this bug remains in 2.4final, which is a shame to me (but probably just a timing mishap), as it makes 2.4 unusable to me. However, the exact version I attached before does seem to work on on 2.4final on WindowsXP, but still not on Linux. Attached is a version that still fails on 2.4final on all systems I've tried. The only difference is using re.compile(...).match instead of re.match.
msg23293 - (view) Author: Raymond Hettinger (rhettinger) * (Python committer) Date: 2004-12-01 03:47
Logged In: YES user_id=80475 Verified that this segfaults on Py2.4 final but not Py2.3.
msg23294 - (view) Author: Gustavo Niemeyer (niemeyer) * (Python committer) Date: 2004-12-02 16:20
Logged In: YES user_id=7887 I'm really sorry for not fixing this before 2.4 final. The only reason it wasn't fixed is because I wasn't aware about it until yesterday. The problem is fixed in CVS on revision 2.110 of _sre.c. The patch is also attached for reference. Thank you very much for reporting it Erik, and thanks you for pointing the bug to me Raymond.
History
Date User Action Args
2022-04-11 14:56:08 admin set github: 41222
2004-11-24 03:38:54 edemaine create