[Tcl-bugs] [ tcl-Bugs-3192580 ] invalid pointer freed

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Bugs item #3192580, was opened at 2011-02-25 19:58
Message generated for change (Comment added) made by dkf
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Category: 41. Memory Allocation
Group: obsolete: 8.5.7
>Status: Pending
Resolution: None
Priority: 5
Private: No
Submitted By: Michael Zalokar (mzalokar)
Assigned to: Jeffrey Hobbs (hobbs)
Summary: invalid pointer freed

Initial Comment:
The program runs for a while, then this.  This is using the standard python, tkinter, tk and tcl included in RHEL 6.

# rpm -qa | egrep "^tcl-|^tk-|^tkinter-|^python-"
python-pycurl-7.19.0-5.el6.x86_64
tcl-devel-8.5.7-6.el6.x86_64
python-libs-2.6.5-3.el6.x86_64
python-ldap-2.3.10-1.el6.x86_64
python-slip-0.2.11-1.el6.noarch
python-iniparse-0.3.1-2.1.el6.noarch
tk-devel-8.5.7-5.el6.x86_64
python-2.6.5-3.el6.x86_64
python-urlgrabber-3.9.1-7.el6.noarch
python-devel-2.6.5-3.el6.x86_64
tkinter-2.6.5-3.el6.x86_64
tcl-8.5.7-6.el6.x86_64
python-ethtool-0.3-5.1.el6.x86_64
python-iwlib-0.1-1.2.el6.x86_64
python-setuptools-0.6.10-3.el6.noarch
tk-8.5.7-5.el6.x86_64
python-meh-0.9-1.el6.noarch


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>Comment By: Donal K. Fellows (dkf)
Date: 2011-02-25 21:20

Message:
Impossible to tell what's wrong on the evidence provided. It could be
python code trying to free an object from the wrong thread (Tcl_Obj values
are strongly thread-bound) or passing in an invalid value. It could also be
a bug in code which has subsequently returned (having put the world into an
inconsistent state first). Memory deallocation faults have a tendency to
not be closely correlated in the code with the bug as memory management is
a complex process-global resource. A minimal program that reproduces the
fault would be superbly useful in progressing this (better yet,
purify/valgrind run)...

(It's even possible that it is a fault in your own code; I see that you
have modules compiled into your home directory loaded. It's just not
possible to rule them out for now.)

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