[PyCUDA] undefined symbol error

[Chris]

Hey Andreas,
I am having a similar issue that Kambiz Tavabi was having. Here is the error
(I have pycuda on anaconda2 just like Kambiz)

File "main_class.py", line 17, in <module>
import pycuda.gl as cuda_gl
File
"/home/uchytilc/anaconda2/lib/python2.7/site-packages/pycuda-2016.1.2-py2.7-linux-x86_64.egg/pycuda/gl/__init__.py",
line 2, in <module>
import pycuda._driver as _drv
ImportError:
/home/uchytilc/anaconda2/lib/python2.7/site-packages/pycuda-2016.1.2-py2.7-linux-x86_64.egg/pycuda/_driver.so:
undefined symbol: _ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED1Ev

The weird thing is that I have some files that are having this problem and
some that are not, with identical import statements.

import sys

from OpenGL.GL import *
from OpenGL.GLUT import *
from OpenGL.GLU import *
from OpenGL.GL.ARB.vertex_buffer_object import *
from OpenGL.GL.ARB.pixel_buffer_object import *

import pycuda.gl as cuda_gl
import pycuda.driver as cuda_driver

The files that are experiencing this issue are all files that run this
import statement right at the top in the main.py file, the one I initialize
from. The one that doesn't hit this error has the import statements in a
second file that is being imported with an __init__.py file. Not sure if
this is pure coincidence or not but I figured it was worth bringing up.



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[Andreas Kloeckner]

Post by Chris
Hey Andreas,
I am having a similar issue that Kambiz Tavabi was having. Here is the error
(I have pycuda on anaconda2 just like Kambiz)
File "main_class.py", line 17, in <module>
import pycuda.gl as cuda_gl
File
"/home/uchytilc/anaconda2/lib/python2.7/site-packages/pycuda-2016.1.2-py2.7-linux-x86_64.egg/pycuda/gl/__init__.py",
line 2, in <module>
import pycuda._driver as _drv
undefined symbol: _ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED1Ev
The weird thing is that I have some files that are having this problem and
some that are not, with identical import statements.
import sys
from OpenGL.GL import *
from OpenGL.GLUT import *
from OpenGL.GLU import *
from OpenGL.GL.ARB.vertex_buffer_object import *
from OpenGL.GL.ARB.pixel_buffer_object import *
import pycuda.gl as cuda_gl
import pycuda.driver as cuda_driver
The files that are experiencing this issue are all files that run this
import statement right at the top in the main.py file, the one I initialize
from. The one that doesn't hit this error has the import statements in a
second file that is being imported with an __init__.py file. Not sure if
this is pure coincidence or not but I figured it was worth bringing up.

Sorry for the delay in responding. GCC 5.1 switched its C++ ABI with version
5. I suspect some of the binary packages you have installed are using
the old ABI (Anaconda is built on CentOS 6 I believe and would be using
the old ABI), while C++ software you built on your machine (PyCUDA) will
use the new ABI. See here for more info:

https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html

Try adding (in PyCUDA's siteconf.py)

-D_GLIBCXX_USE_CXX11_ABI=0

to CXXFLAGS.

Hope that helps,
Andreas

[jredwards]

Hi,

I have been getting the same error message:

Traceback (most recent call last):
File "test/test_driver.py", line 6, in <module>
from pycuda.tools import mark_cuda_test, dtype_to_ctype
File
"/home/jedwards/anaconda3/envs/py36/lib/python3.6/site-packages/pycuda-2016.1.2-py3.6-linux-x86_64.egg/pycuda/tools.py",
line 34, in <module>
import pycuda.driver as cuda
File
"/home/jedwards/anaconda3/envs/py36/lib/python3.6/site-packages/pycuda-2016.1.2-py3.6-linux-x86_64.egg/pycuda/driver.py",
line 5, in <module>
from pycuda._driver import * # noqa
ImportError:
/home/jedwards/anaconda3/envs/py36/lib/python3.6/site-packages/pycuda-2016.1.2-py3.6-linux-x86_64.egg/pycuda/_driver.cpython-36m-x86_64-linux-gnu.so:
undefined symbol: _ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED1Ev

I added -D_GLIBCXX_USE_CXX11_ABI=0 to the CXXFLAGS when remaking, but the
error continues to crop up.

Any ideas?

thanks

James



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[Peter Walsh]

Andreas' suggested fix (build pycuda yourself with CXX11_ABI option) worked
fine for me.

Are you sure you are running the newly built pycuda? The logs show you
using a virtual env etc, sure you installed newly built pycuda to that one
etc?

Post by jredwards
Hi,
File "test/test_driver.py", line 6, in <module>
from pycuda.tools import mark_cuda_test, dtype_to_ctype
File
"/home/jedwards/anaconda3/envs/py36/lib/python3.6/site-
packages/pycuda-2016.1.2-py3.6-linux-x86_64.egg/pycuda/tools.py",
line 34, in <module>
import pycuda.driver as cuda
File
"/home/jedwards/anaconda3/envs/py36/lib/python3.6/site-
packages/pycuda-2016.1.2-py3.6-linux-x86_64.egg/pycuda/driver.py",
line 5, in <module>
from pycuda._driver import * # noqa
/home/jedwards/anaconda3/envs/py36/lib/python3.6/site-
packages/pycuda-2016.1.2-py3.6-linux-x86_64.egg/pycuda/_dri
undefined symbol: _ZNSt7__cxx1112basic_stringIcSt11char_
traitsIcESaIcEED1Ev
I added -D_GLIBCXX_USE_CXX11_ABI=0 to the CXXFLAGS when remaking, but the
error continues to crop up.
Any ideas?
thanks
James
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[jredwards]

Thanks, yes it's definitely installed in that env. I have uninstalled pycuda,
performed a su -c "make clean" for the pycuda download and then re-run su -c
"make install" with the CXXFLAGS. Still getting the same error.



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[Hanan]

*** After suffering for a day I found I had a misspelled the CUDA_ROOT
environment variable! The setup scripts do not verify it is correct.... Be
ware! ***




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