[Tcl-bugs] [ tcl-Bugs-3390272 ] safe-3.* leaks

[SourceForge.net <no...@so...>]

Bugs item #3390272, was opened at 2011-08-12 00:06
Message generated for change (Comment added) made by ferrieux
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=3390272&group_id=10894

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: 33. Safe Base
Group: development: 8.6b2
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Don Porter (dgp)
>Assigned to: miguel sofer (msofer)
Summary: safe-3.* leaks

Initial Comment:

Each of the four tests matching safe-3.* leaks
a Tcl_Obj.

----------------------------------------------------------------------

>Comment By: Alexandre Ferrieux (ferrieux)
Date: 2011-08-12 01:34

Message:
The stack below shows the leaked obj is the interp's objresult, which is
juggled/cached with a local named "objResultPtr". Maybe Miguel, having all
of TEBCresume's invariants in mind, will be quick to find the code path
where that local is improperly overwritten (or not updated when coming out
of a recursive call) ?

'==13739== 24 bytes in 1 blocks are definitely lost in loss record 13 of
15
==13739==    at 0x4005BDC: malloc (vg_replace_malloc.c:195)
==13739==    by 0x402EFB8: TclpAlloc (tclAlloc.c:705)
==13739==    by 0x403F140: Tcl_Alloc (tclCkalloc.c:1046)
==13739==    by 0x40A4BAF: TEBCresume (tclExecute.c:2144)
==13739==    by 0x40343A2: TclNRRunCallbacks (tclBasic.c:4311)
==13739==    by 0x4036635: TclEvalObjEx (tclBasic.c:5882)
==13739==    by 0x40C2D46: SlaveEval (tclInterp.c:2777)
==13739==    by 0x40BFCC3: Tcl_InterpObjCmd (tclInterp.c:826)
==13739==    by 0x4034299: TclNREvalObjv (tclBasic.c:4269)
==13739==    by 0x40A6A41: TEBCresume (tclExecute.c:2793)
==13739==    by 0x40343A2: TclNRRunCallbacks (tclBasic.c:4311)
==13739==    by 0x4033E98: Tcl_EvalObjv (tclBasic.c:4103)


----------------------------------------------------------------------

Comment By: Don Porter (dgp)
Date: 2011-08-12 00:10

Message:
Reduced leaking script:

interp create a -safe
safe::interpInit a
safe::interpDelete a


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=3390272&group_id=10894