[Tcl-bugs] [ tcl-Bugs-804681 ] errorInfo trace can crash in FreeListInternalRep()

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Bugs item #804681, was opened at 2003-09-11 16:00
Message generated for change (Comment added) made by dgp
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=804681&group_id=10894

Category: 45. Traces
Group: 8.4.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Ed Hume (hume)
Assigned to: Don Porter (dgp)
Summary: errorInfo trace can crash in FreeListInternalRep()

Initial Comment:
If a variable trace is placed on errorInfo, certain errors cause a core dump in FreeListInternalRep() 

on both NT and Linux platforms.  The crash does not happen with version 8.3



To show the error enter the following at the Tcl prompt:



proc show args {puts $args}

trace variable errorInfo wu show

expr 9/0



Here is the NT stack:



FreeListInternalRep(Tcl_Obj * 0x002eb348) line 1386 + 6 bytes

TclExecuteByteCode(Tcl_Interp * 0x0029d380, ByteCode * 0x002a5390) line 4198 + 55 bytes

TclCompEvalObj(Tcl_Interp * 0x0029d380, Tcl_Obj * 0x00294ba0) line 1008 + 13 bytes

Tcl_EvalObjEx(Tcl_Interp * 0x0029d380, Tcl_Obj * 0x00294ba0, int 131072) line 3952 + 13 bytes

Tcl_RecordAndEvalObj(Tcl_Interp * 0x0029d380, Tcl_Obj * 0x00294ba0, int 131072) line 142 + 23 

bytes

Tcl_Main(int 1, char * * 0x00274b30, int (Tcl_Interp *)* 0x00401005 _Tcl_AppInit) line 390 + 24 

bytes

main() line 110 + 19 bytes

mainCRTStartup() line 338 + 17 bytes

KERNEL32! 7c4e87f5()



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>Comment By: Don Porter (dgp)
Date: 2003-09-11 18:27

Message:
Logged In: YES 
user_id=80530



Thanks for the report.



Further investigation reveals

this bug entered sometime between

releases Tcl 8.4a4 and Tcl 8.4.0.

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