undefined symbol: bpf_module_create_b

[lizhiyuell]

Hi, I'm installing bcc v0.24.0 in Ubuntu 18.04.1. The compiling is fine, but when I run example code /usr/share/bcc/tools/offcputime, I get the following errors:

Traceback (most recent call last):
  File "/usr/share/bcc/tools/offcputime", line 14, in <module>
    from bcc import BPF
  File "/usr/lib/python2.7/dist-packages/bcc/__init__.py", line 27, in <module>
    from .libbcc import lib, _CB_TYPE, bcc_symbol, bcc_symbol_option, _SYM_CB_TYPE
  File "/usr/lib/python2.7/dist-packages/bcc/libbcc.py", line 20, in <module>
    lib.bpf_module_create_b.restype = ct.c_void_p
  File "/usr/lib/python2.7/ctypes/__init__.py", line 379, in __getattr__
    func = self.__getitem__(name)
  File "/usr/lib/python2.7/ctypes/__init__.py", line 384, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: /usr/lib/x86_64-linux-gnu/libbcc.so.0: undefined symbol: bpf_module_create_b

I install llvm and clang with sudo apt-get install libllvm6.0 llvm-6.0-dev libclang-6.0-dev.
Referring to issue #2222, I remove the previously installed bpfcc-tools and recompile the code, but the problem still exists.

How cloud I fix this problem? Thanks.

[chenhengqi]

Try using python3.

[lizhiyuell]

Try using python3.

Changing to python3 works perfectly. Thanks.

[Tronginx]

I figured out the following solution worked for me:

cp -r /root/ebpf/bcc/build/src/python/bcc-python3/bcc/* /usr/lib/python3/dist-packages/bcc/

replace the first parameter with your bcc python library location.

Souce: https://blog.csdn.net/libocdf/article/details/130466925

[chenhengqi]

Please refer to #4583.