[Python-bugs-list] [Bug #133489] compile leaks memory (current CVS)

[noreply@sourceforge.net]

Bug #133489, was updated on 2001-Feb-21 13:10
Here is a current snapshot of the bug.

Project: Python
Category: Python Interpreter Core
Status: Closed
Resolution: Fixed
Bug Group: None
Priority: 7
Submitted by: effbot
Assigned to : bwarsaw
Summary: compile leaks memory (current CVS)

Details: while 1: compile("print 'hello'\n", "<string>", "exec")

run it. watch your computer run out of memory. enough said ;-) /F


Follow-Ups:

Date: 2001-Feb-23 10:34
By: bwarsaw

Comment:
Fixed in 2.169 of compile.c.
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Date: 2001-Feb-21 19:23
By: jhylton

Comment:
Based on inspection of the code, the following patch looks like it should
fix the problem.  It appears that the very first PySymtableEntryObject (the
one created in symtable_build()) isn't getting cleaned up.  It contains
pointers to all its children, so they aren't cleaned up either.

But if I apply this patch, the interpreter always crashes.  It doesn't seem
to crash at the same place every time, but it always does.  The stack trace
always points to a seg fault in malloc().

So I suspect the patch is correct and that the leak is masking some other
refcount bug.  If you could apply the patch and diagnose the crash, I think
we'd make more progress.

Index: Python/compile.c
===================================================================
RCS file: /cvsroot/python/python/dist/src/Python/compile.c,v
retrieving revision 2.168
diff -c -r2.168 compile.c
***************
*** 4193,4198 ****
--- 4195,4201 ----
  {
        Py_XDECREF(st->st_symbols);
        Py_XDECREF(st->st_stack);
+       Py_XDECREF(st->st_cur);
        PyMem_Free((void *)st);
  }
  
-------------------------------------------------------

Date: 2001-Feb-21 13:14
By: jhylton

Comment:
Can you do an insure pass?

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For detailed info, follow this link:
http://sourceforge.net/bugs/?func=detailbug&bug_id=133489&group_id=5470