[ns] eval signal SIGSEGV

[Sencun Zhu <szhu1@ise.gmu.edu>]

Hello, deal all:

	I met a problem when I use:

  Tcl &tcl=Tcl::instance();
  tcl.eval("set udp__ [new Agent/UDP]");
  agent_ = (Kronos_UdpAgent *) TclObject::lookup(tcl.result());

at c++ level, it receives signal SIGSEGV. while it is okay in TCL level.
the below is the debug information:
....
Reading symbols from /usr/lib/gconv/ISO8859-1.so...done.
#0  0x81574ab in Tcl_ParseCommand () at gen/ptypes.cc:120
120     EmbeddedTcl et_ns_ptypes(code);
(gdb) bt
#0  0x81574ab in Tcl_ParseCommand () at gen/ptypes.cc:120
#1  0x8158495 in Tcl_EvalEx () at gen/ptypes.cc:120
#2  0x81581ca in Tcl_EvalTokens () at gen/ptypes.cc:120
#3  0x8158512 in Tcl_EvalEx () at gen/ptypes.cc:120
#4  0x81587aa in Tcl_Eval () at gen/ptypes.cc:120
#5  0x8125630 in Tcl_GlobalEval () at gen/ptypes.cc:120
#6  0x811bc64 in Tcl::eval () at gen/ptypes.cc:120
......

any hint is appreciated.

BTW:  I wrote similar stuff and ran in ns-2.1b6 before.

thank you

Sencun