[Python-bugs-list] [ python-Bugs-599254 ] Py_SAFE_DOWNCAST assert in marshal.c

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Bugs item #599254, was opened at 2002-08-23 16:19
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Category: Python Interpreter Core
Group: Python 2.2
Status: Closed
Resolution: Duplicate
Priority: 5
Submitted By: John Ehresman (jpe)
Assigned to: Michael Hudson (mwh)
Summary: Py_SAFE_DOWNCAST assert in marshal.c

Initial Comment:
In a win32 debug build (compiled with VC++ 6.0) of
Python 2.2.0 using the default options, the
Py_SAFE_DOWNCAST assertion check fails on line 64 of
marshal.c when c is 0x8c.  The VC++ quick watch window
displays 0xffffff8c as the value of the expression
'(int)(char)c'.  The following code will trigger the
assertion:

import marshal
marshal.dumps([0x8c] * 1000)

I am downloading the latest VC++ service pack now to
see if that makes a difference.

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>Comment By: Thomas Heller (theller)
Date: 2002-08-23 17:17

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To Tim: I've marked it as bugfix candidate in the checkin 
message. Isn't this enough?

"""
Fix SF 588452: debug build crashes on marshal.dumps([128] 
* 1000).
See there for a description.

Added test case.

Bugfix candidate for 2.2.x, not sure about previous versions:
probably low priority, because virtually no one runs debug 
builds.
"""

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Comment By: John Ehresman (jpe)
Date: 2002-08-23 16:33

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Thanks.  It is a duplicate.

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Comment By: Tim Peters (tim_one)
Date: 2002-08-23 16:29

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Yes, it's a duplicate, fixed in current CVS.  IIRC, nobody 
has backported the fix to the 2.2 line.

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Comment By: Michael Hudson (mwh)
Date: 2002-08-23 16:24

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Unless I'm much mistaken, this is a dup of:

[ 588452 ] $DEBUG_PYTHON -O freeze.py broken

which was fixed just a few weeks ago.

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