Bullet samples segfault

Compiling or Editing the Panda Source
1

Using my own build from CVS, the Bullet hello world sample segfaults at launch. Everything else seems fine though. No build errors.

Using the snapshot build from Buildbot (1.8.0+cvs20120719~precise39) the Bullet samples work fine.

I have bullet-2.80-rev2531 installed. Are there any other tricks to compiling with Bullet support?

Here’s the stack trace…

(gdb) run 01_Basics.py 
Starting program: /usr/bin/python 01_Basics.py
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
DirectStart: Starting the game.
Known pipe types:
  glxGraphicsPipe
(all display modules loaded.)
[New Thread 0x7fffdd0ba700 (LWP 11523)]
[Thread 0x7fffdd0ba700 (LWP 11523) exited]
[New Thread 0x7fffdd0ba700 (LWP 11524)]
[New Thread 0x7fffd88b8700 (LWP 11525)]

Program received signal SIGSEGV, Segmentation fault.                                                                                                                                                       
0x00000000000f1976 in ?? ()                                                                                                                                                                                
(gdb) bt                                                                                                                                                                                                   
#0  0x00000000000f1976 in ?? ()                                                                                                                                                                            
#1  0x00007fffd3d37583 in BuildInstants (module=0x1f14e18) at built/tmp/libpandabullet_igate.cxx:50426                                                                                                     
#2  0x00007ffff57b2dce in Dtool_PyModuleInitHelper (defs=0x7fffffffb060, modulename=0x7fffd3d44807 "libpandabullet") at dtool/src/interrogatedb/py_panda.cxx:468                                           
#3  0x00007fffd3c5dd52 in initlibpandabullet () at built/tmp/libpandabullet_module.cxx:18                                                                                                                  
#4  0x000000000047af44 in _PyImport_LoadDynamicModule ()                                                                                                                                                   
#5  0x000000000053d7db in ?? ()                                                                                                                                                                            
#6  0x00000000004fc1a3 in ?? ()                                                                                                                                                                            
#7  0x000000000053e0a4 in ?? ()                                                                                                                                                                            
#8  0x00000000004c2e6b in ?? ()                                                                                                                                                                            
#9  0x0000000000497ea4 in PyEval_EvalFrameEx ()                                                                                                                                                            
#10 0x0000000000498602 in PyEval_EvalFrameEx ()                                                                                                                                                            
#11 0x000000000049f1c0 in PyEval_EvalCodeEx ()                                                                                                                                                             
#12 0x00000000004a8960 in ?? ()                                                                                                                                                                            
#13 0x00000000004e9f36 in PyObject_Call ()                                                                                                                                                                 
#14 0x00000000004ec11a in ?? ()                                                                                                                                                                            
#15 0x00000000004e9f36 in PyObject_Call ()                                                                                                                                                                 
#16 0x00000000004eaa2b in PyObject_CallFunctionObjArgs ()                                                                                                                                                  
#17 0x000000000047e6aa in ?? ()                                                                                                                                                                            
#18 0x000000000049a55a in PyEval_EvalFrameEx ()
#19 0x000000000049f1c0 in PyEval_EvalCodeEx ()
#20 0x00000000004a9081 in PyRun_FileExFlags ()
#21 0x00000000004a9311 in PyRun_SimpleFileExFlags ()
#22 0x00000000004aa8bd in Py_Main ()
#23 0x00007ffff68e576d in __libc_start_main (main=0x41b980 <main>, argc=2, ubp_av=0x7fffffffdfc8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffdfb8)
    at libc-start.c:226
#24 0x000000000041b9b1 in _start 

(gdb) up
#1  0x00007fffd3d37583 in BuildInstants (module=0x1f14e18) at built/tmp/libpandabullet_igate.cxx:50426
50426      PyModule_AddIntConstant(module,"X_up",0);

[/code]

2

Looks like a build conflict, as if some of your Panda libraries are compiled against a different version of Python or so.

3

yup, that was it.

But now I have the same problem with Windows x64. I compiled bullet 2.80-rev2541 using VS2008, as a 64-bit release. Copied the libs and headers into panda’s thirdparty directory and did makepanda.

I can import the bullet modules, e.g.

from panda3d.bullet import BulletWorld

but when I do

self.world=BulletWorld()

it crashes. I just get an error message that “Python has stopped working”, and then Windows tries helplessly to find a solution to the problem for a while. I figure I’ll have to learn how to do debugging on Windows, but first I just thought I’d ask if there are any particular compile options when building Bullet? I just used the defaults in the VS project.

4

I just had a look at the Bulletworld constructor, and I have to admit that there is very bad support for finding errors. For example I do not assert creation of internal objects, and there is no feedback on the spam channel. I can add these later today. Might help finding out what is going on.