[vtk-developers] Bug: Tk + VTK apps crash on exit.

[Prabhu Ramachandran]

hi,

I've been running into a strange problem with the Python wrappers.  I
updated my CVS tree to check out David's subclass stuff and my Tk
based applications are having trouble with the build.  I did a make
clean and a new rebuild and still face the following problem.

Just run vtkTkRenderWidget.py in Wrapping/Python.  Everything runs
fine but when you exit you get this error.

$ python vtkTkRenderWidget.py
Fatal Python error: PyThreadState_Get: no current thread
Aborted
$

While this might not seem a very bad problem it does affect multiple
windows badly.  For instance if I have two renderwindows open using
two different Toplevels then if I close one window the whole
application dies due to the fatal error.  Here is the backtrace on
gdb.

>>> execfile('vtkTkRenderWidget.py')
Fatal Python error: PyThreadState_Get: no current thread

Program received signal SIGABRT, Aborted.
[Switching to Thread 1024 (LWP 22238)]
0x40336911 in kill () from /lib/libc.so.6
(gdb) back
#0  0x40336911 in kill () from /lib/libc.so.6
#1  0x4002dc0e in pthread_kill () from /lib/libpthread.so.0
#2  0x4002e0dd in raise () from /lib/libpthread.so.0
#3  0x40337d71 in abort () from /lib/libc.so.6
#4  0x0806dde1 in Py_FatalError () at Python/pythonrun.c:1231
#5  0x0806c270 in PyThreadState_Get () at Python/pystate.c:213
#6  0x08063b1f in PyErr_Occurred () at Python/errors.c:78
#7  0x0808e5f2 in lookdict (mp=0x8173e1c, key=0x80dfe94, hash=136886352)
    at Objects/dictobject.c:249
#8  0x0808eb4a in PyDict_DelItem (op=0x8173e1c, key=0x80dfe94)
    at Objects/dictobject.c:548
#9  0x404fa7c7 in vtkPythonDeleteObjectFromHash (obj=0x8297aa0)
    at /skratch/prabhu/vtk/cvs/VTK/Common/vtkPythonUtil.cxx:1244
#10 0x404f90a9 in vtkPythonDeleteCommand::Execute (this=0x82a4368, 
    caller=0x828b850)
    at /skratch/prabhu/vtk/cvs/VTK/Common/vtkPythonUtil.cxx:364
#11 0x406e92b5 in vtkSubjectHelper::InvokeEvent (this=0x82c6c60, event=2, 
    callData=0x0, self=0x828b850)
    at /skratch/prabhu/vtk/cvs/VTK/Common/vtkObject.cxx:421
#12 0x406e94e2 in vtkObject::InvokeEvent (this=0x828b850, event=2, 
    callData=0x0) at /skratch/prabhu/vtk/cvs/VTK/Common/vtkObject.cxx:495
#13 0x406e8f89 in vtkObject::UnRegister (this=0x828b850, o=0x0)
    at /skratch/prabhu/vtk/cvs/VTK/Common/vtkObject.cxx:281

This is evidently related to the new changes.  Sounds like a key
error.  I dont really know why exactly the error occurs, I thought it
might be of some use to David.

prabhu