加载psycopg2模块时出现"undefined symbol：_PyObject_NextNotImplemented“错误

Question

environment: Ubuntu 10.04 LTS
build Python 2.7.2 with ./configure --with-zlib --enable-unicode=ucs4
postgresql-9.0
wsgi
Django 1.3
virtualenv
apache

我正在尝试建立Ubuntu Django应用服务器。安装已完成，没有出现错误消息。确切的安装方法在Ubuntu 11.04上是成功的。然而，当在Ubuntu10.04上完成安装并尝试从Django加载psycopg2时，我得到了以下错误(我在11.04没有得到这个错误)：

File "/home/nreeves/venv/lib/python2.7/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 24, in <module>
raise ImproperlyConfigured("Error loading psycopg2 module: %s" % e)
ImproperlyConfigured: Error loading psycopg2 module: /home/nreeves/venv/lib/python2.7/site-packages/psycopg2/_psycopg.so: undefined symbol: _PyObject_NextNotImplemented

我的猜测是某些库的链接是不正确的。但是我不知道从哪里开始..。我有以下输出-不确定这是否对我有帮助…

$ ldd /home/nreeves/venv/lib/python2.7/site-packages/psycopg2/_psycopg.so

linux-gate.so.1 =>  (0xb77da000)
libpq.so.5 => /usr/lib/libpq.so.5 (0xb7788000)
libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0xb776f000)
libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7614000)
libssl.so.0.9.8 => /lib/i686/cmov/libssl.so.0.9.8 (0xb75cc000)
libcrypto.so.0.9.8 => /lib/i686/cmov/libcrypto.so.0.9.8 (0xb747a000)
libkrb5.so.3 => /usr/lib/libkrb5.so.3 (0xb73c9000)
libcom_err.so.2 => /lib/libcom_err.so.2 (0xb73c5000)
libgssapi_krb5.so.2 => /usr/lib/libgssapi_krb5.so.2 (0xb7395000)
libldap_r-2.4.so.2 => /usr/lib/libldap_r-2.4.so.2 (0xb734e000)
/lib/ld-linux.so.2 (0xb77db000)
libdl.so.2 => /lib/tls/i686/cmov/libdl.so.2 (0xb734a000)
libz.so.1 => /lib/libz.so.1 (0xb7335000)
libk5crypto.so.3 => /usr/lib/libk5crypto.so.3 (0xb7311000)
libkrb5support.so.0 => /usr/lib/libkrb5support.so.0 (0xb7308000)
libkeyutils.so.1 => /lib/libkeyutils.so.1 (0xb7304000)
libresolv.so.2 => /lib/tls/i686/cmov/libresolv.so.2 (0xb72f0000)
liblber-2.4.so.2 => /usr/lib/liblber-2.4.so.2 (0xb72e3000)
libsasl2.so.2 => /usr/lib/libsasl2.so.2 (0xb72cb000)
libgnutls.so.26 => /usr/lib/libgnutls.so.26 (0xb722f000)
libtasn1.so.3 => /usr/lib/libtasn1.so.3 (0xb721e000)
libgcrypt.so.11 => /lib/libgcrypt.so.11 (0xb71ab000)
libgpg-error.so.0 => /lib/libgpg-error.so.0 (0xb71a6000)

以及以下命令输出：

$ ls -l  /usr/lib/libpq*

-rw-r--r-- 1 root root 224904 2011-09-26 06:33 /usr/lib/libpq.a
lrwxrwxrwx 1 root root     12 2011-09-26 10:51 /usr/lib/libpq.so -> libpq.so.5.4
lrwxrwxrwx 1 root root     12 2011-09-26 10:51 /usr/lib/libpq.so.5 -> libpq.so.5.4
-rw-r--r-- 1 root root 150976 2011-09-26 06:33 /usr/lib/libpq.so.5.4

在我看来，一切都是正确的。任何建议都将不胜感激。

Answer 1

你提到了'wsgi‘作为一个标签。如果这意味着您正在使用Apache/mod_wsgi，那么请注意mod_wsgi必须针对相同的Python版本/安装进行编译，并且您需要验证mod_wsgi在运行时选取的libpython.so是否与指定链接的Python库的mod_wsgi相同。

Answer 2

多亏了patrys和Graham Dumpleton，很明显，我的自定义构建Python2.7和wsgi安装是错误的，并且缺少关键的库链接。现在，按照下面的说明解决此问题即可解决问题。感谢所有分享信息的聪明和善良的人。

卸载Python：https://askubuntu.com/questions/17841/will-python2-7-be-available-for-lucid-in-future

• Then

• WSGI：sudo apt-get purge libapache2-mod-wsgi

• Install WSGI：http://grok.zope.org/documentation/tutorial/installing-and-setting-up-grok-under-mod-wsgi/installing-and-configuring-mod-wsgi

Answer 3

这个特殊的符号来自libpython*.*.so.1.0 (用您的python版本替换通配符)。当使用nm列出动态符号时，您应该会看到它

$ ldd /usr/lib64/python2.7/site-packages/psycopg2/_psycopg.so | grep libpython
libpython2.7.so.1.0 => /usr/lib64/libpython2.7.so.1.0 (0x00007fe14f0c6000)
$ nm -D /usr/lib64/libpython2.7.so.1.0 | grep PyObject_NextNotImplemented
000000000008a880 T _PyObject_NextNotImplemented

您是否在使用自定义构建？看起来你的_psycopg.so版本根本没有链接到libpython。