Yum commands error "pycurl.so: undefined symbol: CRYPTO_set_locking_callback"

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux

Issue

  • When I run yum, following error occurs:

    [root@host tmp]# yum check update
    There was a problem importing one of the Python modules
    required to run yum. The error leading to this problem was:
    
    /usr/lib64/python2.6/site-packages/pycurl.so: undefined symbol: CRYPTO_set_locking_callback
    
    Please install a package which provides this module, or
    verify that the module is installed correctly.
    
    It's possible that the above module doesn't match the
    current version of Python, which is:
    2.6.6 (r266:84292, Sep  4 2013, 07:46:00)
    [GCC 4.4.7 20120313 (Red Hat 4.4.7-3)]
    
    If you cannot solve this problem yourself, please go to
    the yum faq at:
    http://yum.baseurl.org/wiki/Faq
    

Resolution

  • Check and fix the related library paths or remove 3rd party libraries, usually libcurl or libssh2. On a x86_64 system, the standard paths for those libraries are /usr/lib64/libcurl.so.4 and /usr/lib64/libssh2.so.1

Root Cause

  • One or more third party libraries have been installed.

    # ldconfig -p -N -X | grep curl
    libcurl.so.4 (libc6,x86-64) => /usr/lib/libcurl.so.4
    libcurl.so.4 (libc6,x86-64) => /usr/lib64/libcurl.so.4
    libcurl.so (libc6,x86-64) => /usr/lib/libcurl.so
    
    # ldconfig -p -N -X | grep ssh
    libssh2.so.1 (libc6,x86-64) => /lib/libssh2.so.1
    libssh2.so.1 (libc6,x86-64) => /usr/lib64/libssh2.so.1
    libssh2.so (libc6,x86-64) => /lib/libssh2.so
    

Diagnostic Steps

  • Look at the library dependencies using the ldd tool. You can notice that pycurl.so requires libcurl.so.4, which requires libssh2.so.1, which requires libcrypto.so.10 from the OpenSSL library. This last one provides the missing symbol:

    # nm -D /usr/lib64/libcrypto.so.10 | grep -i CRYPTO_set_locking_callback
    000000000006a2e0 T CRYPTO_set_locking_callback
    
  • Output of ldd command in normal system.

    # ldd /usr/lib64/python2.6/site-packages/pycurl.so
    linux-vdso.so.1 =>  (0x00007fff9cb7f000)
    libcurl.so.4 => /usr/lib64/libcurl.so.4 (0x00007fc35da43000)  <<--- proper path
    libpython2.6.so.1.0 => /usr/lib64/libpython2.6.so.1.0 (0x00007fc35d69d000)
    libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fc35d47f000)
    libc.so.6 => /lib64/libc.so.6 (0x00007fc35d0eb000)
    libidn.so.11 => /lib64/libidn.so.11 (0x00007fc35ceb9000)
    libldap-2.4.so.2 => /lib64/libldap-2.4.so.2 (0x00007fc35cc68000)
    librt.so.1 => /lib64/librt.so.1 (0x00007fc35ca60000)
    libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x00007fc35c81c000)
    libkrb5.so.3 => /lib64/libkrb5.so.3 (0x00007fc35c535000)
    libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00007fc35c309000)
    libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007fc35c105000)
    libz.so.1 => /lib64/libz.so.1 (0x00007fc35beee000)
    libssl3.so => /usr/lib64/libssl3.so (0x00007fc35bcaf000)
    libsmime3.so => /usr/lib64/libsmime3.so (0x00007fc35ba83000)
    libnss3.so => /usr/lib64/libnss3.so (0x00007fc35b743000)
    libnssutil3.so => /usr/lib64/libnssutil3.so (0x00007fc35b517000)
    libplds4.so => /lib64/libplds4.so (0x00007fc35b313000)
    libplc4.so => /lib64/libplc4.so (0x00007fc35b10d000)
    libnspr4.so => /lib64/libnspr4.so (0x00007fc35aecf000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00007fc35accb000)
    libssh2.so.1 => /usr/lib64/libssh2.so.1 (0x00007fc35aaa2000)
    libutil.so.1 => /lib64/libutil.so.1 (0x00007fc35a89f000)
    libm.so.6 => /lib64/libm.so.6 (0x00007fc35a61b000)
    /lib64/ld-linux-x86-64.so.2 (0x0000003369800000)
    liblber-2.4.so.2 => /lib64/liblber-2.4.so.2 (0x00007fc35a40b000)
    libresolv.so.2 => /lib64/libresolv.so.2 (0x00007fc35a1f1000)
    libsasl2.so.2 => /usr/lib64/libsasl2.so.2 (0x00007fc359fd7000)
    libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x00007fc359dcb000)
    libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007fc359bc8000)
    libssl.so.10 => /usr/lib64/libssl.so.10 (0x00007fc35995b000)
    libcrypto.so.10 => /usr/lib64/libcrypto.so.10 (0x00007fc359578000)
    libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007fc359341000)
    libselinux.so.1 => /lib64/libselinux.so.1 (0x00007fc359121000)
    libfreebl3.so => /lib64/libfreebl3.so (0x00007fc358ea8000)
    
  • Output of ldd command in problematic system.

    # ldd /usr/lib64/python2.6/site-packages/pycurl.so
    linux-vdso.so.1 =>  (0x00007fff973ff000)
    libcurl.so.4 => /usr/lib/libcurl.so.4 (0x00007fe0691d1000) <<<----- might be changed.
    libpython2.6.so.1.0 => /usr/lib64/libpython2.6.so.1.0 (0x00007f110b8af000)
    libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fc35d47f000)
    libc.so.6 => /lib64/libc.so.6 (0x00007fc35d0eb000)
    librt.so.1 => /lib64/librt.so.1 (0x00007fc35ca60000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00007fc35accb000)
    libutil.so.1 => /lib64/libutil.so.1 (0x00007fc35a89f000)
    libm.so.6 => /lib64/libm.so.6 (0x00007fc35a61b000)
    /lib64/ld-linux-x86-64.so.2 (0x0000003369800000)
    
  • Do an strace on the yum command, you'll probably see it pointing to the problem package or file, like:

    open("/usr/lib/libcurl.so.4", O_RDONLY) = 9
    

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7 Comments

Sorry Posted here by mistake.

root@taxqn1psoradb03:~ # ldconfig -p -N -X | grep curl libwsman_curl_client_transport.so.1 (libc6,x86-64) => /usr/lib64/libwsman_curl_client_transport.so.1 libcurl.so.4 (libc6,x86-64) => /usr/lib64/libcurl.so.4 root@taxqn1psoradb03:~ #

root@taxqn1psoradb03:~ # ldd /usr/lib64/python2.6/site-packages/pycurl.so linux-vdso.so.1 => (0x00007fff4a3ff000) libcurl.so.4 => /usr/lib64/libcurl.so.4 (0x00007f469a9ad000) libpython2.6.so.1.0 => /usr/lib64/libpython2.6.so.1.0 (0x00007f469a607000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f469a3e9000) libc.so.6 => /lib64/libc.so.6 (0x00007f469a055000) libidn.so.11 => /lib64/libidn.so.11 (0x00007f4699e23000) libldap-2.4.so.2 => /lib64/libldap-2.4.so.2 (0x00007f4699bd5000) librt.so.1 => /lib64/librt.so.1 (0x00007f46999cd000) libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x00007f4699789000) libkrb5.so.3 => /lib64/libkrb5.so.3 (0x00007f46994a2000) libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00007f4699276000) libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007f4699072000) libz.so.1 => /lib64/libz.so.1 (0x00007f4698e5b000) libssl3.so => /usr/lib64/libssl3.so (0x00007f4698c1d000) libsmime3.so => /usr/lib64/libsmime3.so (0x00007f46989f1000) libnss3.so => /usr/lib64/libnss3.so (0x00007f46986b2000) libnssutil3.so => /usr/lib64/libnssutil3.so (0x00007f4698486000) libplds4.so => /lib64/libplds4.so (0x00007f4698282000) libplc4.so => /lib64/libplc4.so (0x00007f469807c000) libnspr4.so => /lib64/libnspr4.so (0x00007f4697e3f000) libdl.so.2 => /lib64/libdl.so.2 (0x00007f4697c3b000) libssh2.so.1 => /usr/lib64/libssh2.so.1 (0x00007f4697a12000) libutil.so.1 => /lib64/libutil.so.1 (0x00007f469780f000) libm.so.6 => /lib64/libm.so.6 (0x00007f469758b000) /lib64/ld-linux-x86-64.so.2 (0x00000039d2000000) liblber-2.4.so.2 => /lib64/liblber-2.4.so.2 (0x00007f469737b000) libresolv.so.2 => /lib64/libresolv.so.2 (0x00007f4697161000) libsasl2.so.2 => /usr/lib64/libsasl2.so.2 (0x00007f4696f47000) libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x00007f4696d3b000) libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007f4696b38000) libssl.so.10 => /usr/lib64/libssl.so.10 (0x00007f46968cb000) libcrypto.so.10 => /usr/lib64/libcrypto.so.10 (0x00007f46964eb000) libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007f46962b4000) libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f4696094000) libfreebl3.so => /lib64/libfreebl3.so (0x00007f4695e1d000) root@taxqn1psoradb03:~ #

Please help me correct the wrong library path

hi

We tried, same issue

yum install subscription-manager-migration subscription-manager-migration-data There was a problem importing one of the Python modules required to run yum. The error leading to this problem was:

/usr/lib64/python2.6/site-packages/pycurl.so: undefined symbol: CRYPTO_set_locking_callback

Please install a package which provides this module, or verify that the module is installed correctly.

It's possible that the above module doesn't match the current version of Python, which is: 2.6.6 (r266:84292, Nov 21 2013, 10:50:32) [GCC 4.4.7 20120313 (Red Hat 4.4.7-4)]

If you cannot solve this problem yourself, please go to the yum faq at: http://yum.baseurl.org/wiki/Faq

Also be sure to check the LD Cache Configuration.

I.e., while the vendor may not replace the /usr/lib[64]/libcurl.so* et al., they can interject an alternative source for it via files in /etc/ld.so.conf.d/*.conf files. Run "ldconfig" after removing the offending file so those directories are not scanned.

I run into this regularly with poorly behaving ISV software that replaces the system-wide libcurl, instead of exporting LD_LIBRARY_PATH under the executing user(s).