Tcl - Segmentation fault when evaluating 'string is'

Author

Segmentation fault when evaluating 'string is'

mathieu

2006-12-18, 7:11 pm

Hello there,

I have a bizarre problem where my application is segfaulting. The
last tcl call I can see is:

if {[string is double 405.73]}
{.2.11.19.20.23.26.114.304.306.308.314.318.320 insert 0 405.73}

The backtrace in gdb is:

(gdb) bt
#0 0xa6af21c3 in Tcl_CommandComplete () from /usr/lib/libtcl8.4.so.0
#1 0xa6af1e01 in Tcl_ParseCommand () from /usr/lib/libtcl8.4.so.0
#2 0xa6af3be4 in TclParseInteger () from /usr/lib/libtcl8.4.so.0
#3 0xa6af427f in TclParseInteger () from /usr/lib/libtcl8.4.so.0
#4 0xa6af430f in TclParseInteger () from /usr/lib/libtcl8.4.so.0
#5 0xa6af439f in TclParseInteger () from /usr/lib/libtcl8.4.so.0
#6 0xa6af442f in TclParseInteger () from /usr/lib/libtcl8.4.so.0
#7 0xa6af44cf in TclParseInteger () from /usr/lib/libtcl8.4.so.0
#8 0xa6af455f in TclParseInteger () from /usr/lib/libtcl8.4.so.0
#9 0xa6af45ef in TclParseInteger () from /usr/lib/libtcl8.4.so.0
#10 0xa6af467f in TclParseInteger () from /usr/lib/libtcl8.4.so.0
#11 0xa6af470f in TclParseInteger () from /usr/lib/libtcl8.4.so.0
#12 0xa6af36ce in TclParseInteger () from /usr/lib/libtcl8.4.so.0
#13 0xa6af4857 in Tcl_ParseExpr () from /usr/lib/libtcl8.4.so.0
#14 0xa6abadda in TclCompileExpr () from /usr/lib/libtcl8.4.so.0
#15 0xa6ac6885 in Tcl_ExprObj () from /usr/lib/libtcl8.4.so.0
#16 0xa6a9d193 in Tcl_ExprBooleanObj () from /usr/lib/libtcl8.4.so.0
#17 0xa6aaaa55 in Tcl_IfObjCmd () from /usr/lib/libtcl8.4.so.0
#18 0xa6a9d931 in TclEvalObjvInternal () from /usr/lib/libtcl8.4.so.0
#19 0xa6a9dedd in Tcl_EvalEx () from /usr/lib/libtcl8.4.so.0
#20 0xa6a9e1eb in Tcl_Eval () from /usr/lib/libtcl8.4.so.0
#21 0xa6a9e286 in Tcl_GlobalEval () from /usr/lib/libtcl8.4.so.0

Thanks for any suggestion,
-M

peace07

2006-12-18, 7:11 pm

mathieu schrieb:

> Hello there,
>
> I have a bizarre problem where my application is segfaulting. The
> last tcl call I can see is:
>
> if {[string is double 405.73]}
> {.2.11.19.20.23.26.114.304.306.308.314.318.320 insert 0 405.73}
>

string is double 405.73
works fine for me. So, does this single statement causes an
segmentation fault in your environment? In other words, you start your
Tcl-Interpreter and you get the segmentation fault by typing
string is double 405.73
?
Regards,
Friedemann

Andreas Leitgeb

2006-12-18, 7:11 pm

mathieu <mathieu.malaterre@gmail.com> wrote:
> Hello there,
> I have a bizarre problem where my application is segfaulting. The
> last tcl call I can see is:
> if {[string is double 405.73]}
> {.2.11.19.20.23.26.114.304.306.308.314.318.320 insert 0 405.73}

Doesn't segfault here, but that doesn't necessarily mean anything.

does it also segfault for expr {[string is double 405.73]} ?
if not, does it also for an empty "then"-clause?
if not, what type of widget is .2.11.19.20.... ?

Which platform?

Could be a bug triggered by shimmering some string to double.

Michael A. Cleverly

2006-12-18, 7:12 pm

On Mon, 18 Dec 2006, mathieu wrote:

> Hello there,
>
> I have a bizarre problem where my application is segfaulting. The
> last tcl call I can see is:
>
> if {[string is double 405.73]}
> {.2.11.19.20.23.26.114.304.306.308.314.318.320 insert 0 405.73}

Based on the name of your widget I'm guessing you are building a GUI for
some kind of SNMP application? Are you running tclsh or a custom built
interpreter? Are you loading binary extensions?

Michael

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