Re: [Xotcl] how to track a segmentation fault problem in Xotcl?

From: Catherine Letondal <letondal_at_pasteur.fr>
Date: Mon, 01 Sep 2003 11:56:57 +0200

Zoran Vasiljevic wrote:
> On Friday 29 August 2003 16:26, Catherine Letondal wrote:
> > Hi,
> >
> > I have just re-installed Xotcl 1.0.2 version and succedeed in running my
> > application with some minor changes since the last xotcl version I used on
> > this platform (Sparc/Solaris 7) was the 0.9 :-)
> >
> > I have a segmentation fault that occurs when a command is called from a Tk
> > menu. The command is attached to the popup by a:
> > add command -command
> > statement on a menu Tk widget that is raised by a tk_popup.
> >
> > However, the very same command, when called from the tcl (xowish)
> > interpreter, works and does not produce any core dump. And most menu items
> > also work well.
> >
> > So my question is: how do I debug such a situation?
> > Thanks for any help...
>
> You should compile wish with symbols (./configure --enable-symbols).
> The same appiles for xotcl as well.


When I compile xotcl after a ./configure --enable-symbols the compilation
just fails to compile because it looks for a libtcl8.3g.so file (or maybe I should
have built the tcl library before?):

cc -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DVERSION=\"1.0\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_UNISTD_H=1 -DHAVE_TCL_COMPILE_H=1 -DTCL_SHLIB_EXT=\".so\" -I/local/packages/tcl8.3.2/generic -I/local/packages/tcl8.3.2/unix -I"./../generic" -I"./../unix" -I"/usr/local/include" -g -g -fPIC -g -DXOLIBPKG=\"/usr/local/lib/xotcl1.0\" -DXOTCLVERSION=\"1.0\" -DXOTCLPATCHLEVEL=\".2\" -c `echo ../unix/xotclAppInit.c` -o o/xotclAppInit.o
cc: Warning: illegal option -fPIC
cc -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DVERSION=\"1.0\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_UNISTD_H=1 -DHAVE_TCL_COMPILE_H=1 -DTCL_SHLIB_EXT=\".so\" -I/local/packages/tcl8.3.2/generic -I/local/packages/tcl8.3.2/unix -I"./../generic" -I"./../unix" -I"/usr/local/include" -g -g -fPIC -g -DXOLIBPKG=\"/usr/local/lib/xotcl1.0\" -DXOTCLVERSION=\"1.0\" -DXOTCLPATCHLEVEL=\".2\" -c `echo ../generic/findXOTcl.c` -o o/findXOTcl.o
cc: Warning: illegal option -fPIC
cc o/xotclAppInit.o o/findXOTcl.o -L/local/packages/tcl8.3.2/unix -ltcl8.3g -ldl -lsocket -lnsl -lm -lc -o ../xotclsh
ld: fatal: library -ltcl8.3g: not found
ld: fatal: File processing errors. No output written to ../xotclsh
*** Error code 1
make: Fatal error: Command failed for target `../xotclsh'
Current working directory /local/packages/xotcl-1.0.2/unix
*** Error code 1
make: Fatal error: Command failed for target `xotclsh'



But in fact, gdb tells where the program stopped:

(gdb) bt
#0 0xfed5c580 in Tcl_PopCallFrame () from /local/lib/libtcl8.3.so
#1 0xfed69950 in TclObjInterpProc () from /local/lib/libtcl8.3.so
#2 0xfed61f98 in EvalObjv () from /local/lib/libtcl8.3.so
#3 0xfed625dc in Tcl_EvalEx () from /local/lib/libtcl8.3.so
#4 0xfed627cc in Tcl_Eval () from /local/lib/libtcl8.3.so
#5 0xfed28114 in Tcl_GlobalEval () from /local/lib/libtcl8.3.so
#6 0xfee26058 in Tk_BindEvent () from /local/lib/libtk8.3.so
#7 0xfee2aaac in TkBindEventProc () from /local/lib/libtk8.3.so
#8 0xfee308a0 in Tk_HandleEvent () from /local/lib/libtk8.3.so
#9 0xfee30ca4 in WindowEventProc () from /local/lib/libtk8.3.so
#10 0xfed5f960 in Tcl_ServiceEvent () from /local/lib/libtcl8.3.so
#11 0xfed5fcf8 in Tcl_DoOneEvent () from /local/lib/libtcl8.3.so
#12 0xfee30d08 in Tk_MainLoop () from /local/lib/libtk8.3.so
#13 0xfee3bb7c in Tk_MainEx () from /local/lib/libtk8.3.so
#14 0x2be9c in main ()


In fact I should rather re-start from the beginning. I had many problems during
the compilation of Xotcl on my platform.
Here is how the output looks like:

Text relocation remains referenced
    against symbol offset in file
<unknown> 0x140f8 so/xotcl.o
<unknown> 0x140f4 so/xotcl.o
<unknown> 0x13d78 so/xotcl.o
<unknown> 0x10b60 so/xotcl.o
<unknown> 0x13644 so/xotcl.o
<unknown> 0x10b5c so/xotcl.o
[...]
memcpy 0x50 so/xotcl.o
memcpy 0x124 so/xotcl.o
memcpy 0x638 so/xotcl.o
memcpy 0xf594 so/xotcl.o
memcpy 0x5a4 so/xotcl.o
memcpy 0xbc so/xotcl.o
tclStubsPtr 0x96a8 so/xotcl.o
tclStubsPtr 0x98ac so/xotcl.o
tclStubsPtr 0x98dc so/xotcl.o
tclStubsPtr 0x98e0 so/xotcl.o
tclStubsPtr 0x9680 so/xotcl.o
tclStubsPtr 0x9600 so/xotcl.o
[...]
tclStubsPtr 0x468 so/xotclTrace.o
[...]
XOTclObjErrArgCnt 0xd2f8 so/xotcl.o
[...]
XOTclObjErrArgCnt 0x12dac so/xotcl.o
[...]
XOTclObjErrArgCnt 0x458 so/xotclTrace.o
[...]
tclIntStubsPtr 0x119dc so/xotcl.o
[...]
XOTclAddPMethod 0x10ad8 so/xotcl.o
XOTclAddPMethod 0x1447c so/xotcl.o
XOTclSelfDispatchCmd 0x1443c so/xotcl.o
XOTclSelfDispatchCmd 0x14438 so/xotcl.o
XOTclInitProcNSCmd 0x14414 so/xotcl.o
XOTclInitProcNSCmd 0x14418 so/xotcl.o
Xotcl_Init 0x12f40 so/xotcl.o
Tcl_InitStubs 0x138f0 so/xotcl.o
XOTcl_TraceObjCmd 0x14388 so/xotcl.o
XOTcl_TraceObjCmd 0x14384 so/xotcl.o
<unknown> 0xa4 so/xotclError.o
<unknown> 0xc0 so/xotclError.o
<unknown> 0x114 so/xotclError.o
[...]

XOTclStackTrace 0x498 so/xotclTrace.o
XOTclCallStackTrace 0x4c0 so/xotclTrace.o
ld: fatal: relocations remain against allocatable but non-writable sections
make: Fatal error: Command failed for target `libxotcl1.0.so'
Current working directory /local/packages/xotcl-1.0.2/unix
make: Fatal error: Command failed for target `libs'

I don't remember how it is I still have a libxotcl1.o.so built!!

No wonder there is a segmentation fault.

Thanks a lot for any help,

--
Catherine Letondal -- Pasteur Institute Computing Center