[Python-bugs-list] [Bug #115919] Integer multiplication overflow

Tue, 3 Oct 2000 09:03:45 -0700

Bug #115919, was updated on 2000-Oct-03 08:01
Here is a current snapshot of the bug.

Project: Python
Category: Core
Status: Open
Resolution: None
Bug Group: None
Priority: 5
Summary: Integer multiplication overflow

Details: roland@cachemir ~ $ python2.0 
Python 2.0b2 (#3, Oct  3 2000, 16:30:25) 
[GCC 2.95.2 20000220 (Debian GNU/Linux)] on linux2
Type "copyright", "credits" or "license" for more information.
>>> 1+1
2
>>> 1*1
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
OverflowError: integer multiplication
>>> 

Last CVS update 2000-10-03 around 14:00 UTC.  Last before that was some weeks ago, sorry for not being precise.  Compiled with ./configure --prefix=/usr/local/ && make, su and make install.  Only personal change is the use of readline in Modules/Setup.local.  Did I do something wrong?

Follow-Ups:

Date: 2000-Oct-03 08:25
By: jhylton

Comment:
What happens when you run "make test"?  It looks like there is something fundamentally broken, but I can't tell what it is.  If 1*1 fails, I expect the rest of the test suite to also report errors.

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Date: 2000-Oct-03 08:38
By: lo-lan-do

Comment:
make test shows me plenty of lines looking like this one (except the name of the test changes):

test_grammar
test test_grammar crashed -- exceptions.OverflowError: integer multiplication

I also get messages along the lines of 'test test_dbm skipped --  No module named dbm', but I guess these ones are OK.
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Date: 2000-Oct-03 08:40
By: jhylton

Comment:
Can you include the complete output?

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Date: 2000-Oct-03 09:02
By: lo-lan-do

Comment:
[In case the bug would be caused by a recent upgrade to a beta glibc, I tried the '1*1' test with Python 1.5.2.  No bug visible there.]

$ make distclean && ./configure --prefix=/usr/local/ && make
$ make test &> test.log

It seems that 'make test' somehow hangs when testing threads, so I cut at that point.  I hope the relevant info is shown before that point.
Here goes...

PYTHONPATH= ./python -tt ./Lib/test/regrtest.py -l
Unhandled exception in thread:
test_grammar
test test_grammar crashed -- exceptions.OverflowError: integer multiplication
test_opcodes
test_operations
test_builtin
test test_builtin crashed -- exceptions.OverflowError: integer multiplication
test_exceptions
test_types
test test_types crashed -- exceptions.OverflowError: integer multiplication
test_MimeWriter
test_StringIO
test_al
test test_al skipped --  No module named al
test_array
test test_array crashed -- exceptions.OverflowError: integer multiplication
test_atexit
test_audioop
test test_audioop skipped --  No module named audioop
test_augassign
test test_augassign crashed -- exceptions.OverflowError: integer multiplication
test_binascii
test_binhex
test test_binhex crashed -- exceptions.OverflowError: integer multiplication
test_bsddb
test_cd
test test_cd skipped --  No module named cd
test_cfgparser
test test_cfgparser crashed -- exceptions.OverflowError: integer multiplication
test_cgi
test test_cgi crashed -- exceptions.OverflowError: integer multiplication
test_cl
test test_cl skipped --  No module named cl
test_class
test_cmath
test_compile
test_contains
test_cookie
test test_cookie crashed -- exceptions.OverflowError: integer multiplication
test_cpickle
test_crypt
test test_crypt skipped --  No module named crypt
test_dbm
test test_dbm skipped --  No module named dbm
test_dl
test test_dl skipped --  No module named dl
test_dospath
test_errno
test_extcall
test_fcntl
test_file
test_fork1
test_format
test_gc
test_gdbm
test test_gdbm skipped --  No module named gdbm
test_getopt
test_gettext
test test_gettext crashed -- exceptions.OverflowError: integer multiplication
test_gl
test test_gl skipped --  No module named gl
test_grp
test_gzip
test test_gzip skipped --  No module named zlib
test_hash
test_imageop
test test_imageop skipped --  No module named imageop
test_imgfile
test test_imgfile skipped --  No module named imgfile
test_largefile
test test_largefile skipped --  platform does not have largefile support
test_linuxaudiodev
test test_linuxaudiodev skipped --  No module named linuxaudiodev
test_long
test test_long crashed -- exceptions.OverflowError: integer multiplication
test_longexp
test_math
test_md5
test_mimetools
test test_mimetools crashed -- exceptions.AttributeError: encode
test_minidom
test test_minidom skipped --  No module named pyexpat
test_mmap
test test_mmap crashed -- exceptions.OverflowError: integer multiplication
test_new
test_nis
test test_nis skipped --  No module named nis
test_ntpath
test_openpty
test_operator
test test_operator failed -- Writing: 'mul(5, 2) = <class exceptions.OverflowError at 0x818f41c>: 10 expected', expected: 'testing:
 neg\012testing: or_\012testing: pos\012testing: repeat\012testing: rshift'
test_parser
test_pickle
test_pkg
test_poll
test test_poll crashed -- exceptions.OverflowError: integer multiplication
test_popen2
test_posixpath
test_pow
test test_pow crashed -- exceptions.OverflowError: integer multiplication
test_pty
test test_pty skipped --  No module named termios
test_pwd
test_pyexpat
test test_pyexpat skipped --  cannot import name expat
test_re
test test_re crashed -- exceptions.OverflowError: integer multiplication
test_regex
test_rfc822
test test_rfc822 crashed -- exceptions.OverflowError: integer multiplication
test_rgbimg
test test_rgbimg skipped --  No module named rgbimg
test_rotor
test_sax
test test_sax skipped --  cannot import name expat
test_select
test_sha
test_signal
test_socket
test_sre
test test_sre failed -- Writing: "sre.match(r'(a)|(b)', 'b').start(1)", expected: ''
test_strftime
test test_strftime crashed -- exceptions.OverflowError: integer multiplication
test_string
test_strop
test_struct
test test_struct crashed -- exceptions.OverflowError: integer multiplication
test_sunaudiodev
test test_sunaudiodev skipped --  No module named sunaudiodev
test_thread
Traceback (most recent call last):
  File "./Lib/test/test_thread.py", line 21, in task
    delay = random.random() * numtasks
  File "/home/roland/perso/src/sourceforge/python/dist/src/Lib/whrandom.py", line 71, in random
    x = (171 * x) % 30269
OverflowError: integer multiplication

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Date: 2000-Oct-03 09:03
By: jhylton

Comment:
Two more questions:
1) What platform?  Is this a 64-bit machine?  A regular x86?
2) Could you run this under gdb and report where exactly the error is being generated?  The exception is raised in Objects/intobject.c.  I would set a breakpoint at the top of int_mul() and step through the function.

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For detailed info, follow this link:
http://sourceforge.net/bugs/?func=detailbug&bug_id=115919&group_id=5470