AIX Open Source Tip: Analyzing module loading errors

Question & Answer

Question

How do I determine why my Open Source application is missing modules?

Answer

One of the most common problems reported by AIX Toolbox for Open Source Applications users is failure to load dependent modules.

For example,
# curl --help

(Note: the errors are enumerated for analysis)

1) exec(): 0509-036 Cannot load program curl because of the following errors: 2) 0509-022 Cannot load module /opt/freeware/lib64/libcurl.a(libcurl.so.4). 3) 0509-150 Dependent module /opt/freeware/lib/libssl.a(libssl.so.1.0.2) could not be loaded. 4) 0509-152 Member libssl.so.1.0.2 is not found in archive 5) 0509-022 Cannot load module curl_64. 6) 0509-150 Dependent module /opt/freeware/lib64/libcurl.a(libcurl.so.4) could not be loaded. 7) 0509-022 Cannot load module .

Now, examine the first few errors.

1) exec(): 0509-036 Cannot load program curl because of the following errors:

The curl program was found, but could not load.

2) 0509-022 Cannot load module /opt/freeware/lib64/libcurl.a(libcurl.so.4). 3) 0509-150 Dependent module /opt/freeware/lib/libssl.a(libssl.so.1.0.2) could not be loaded. 4) 0509-152 Member libssl.so.1.0.2 is not found in archive

The curl program tried to load libcurl.a but failed because an expected member libssl.so.1.0.2 was not found in the dependent libssl.a archive.

Examine the program to determine the library search path and dependencies.

# dump -X32_64 -Hv /opt/freeware/bin/curl INDEX PATH BASE MEMBER 0 /opt/freeware/lib64:/opt/freeware/lib64:/opt/freeware/lib:/usr/lib:/lib 1 libc.a shr_64.o 2 libpthreads.a shr_xpg5_64.o 3 libcurl.a libcurl.so.4 4 libz.a libz.so.1 5 libssh2.a libssh2.so.1 6 /opt/freeware/lib libgssapi_krb5.a libgssapi_krb5.so 7 /opt/freeware/lib libkrb5.a libkrb5.so 8 /opt/freeware/lib libk5crypto.a libk5crypto.so 9 /opt/freeware/lib libcom_err.a libcom_err.so 10 /opt/freeware/lib liblber.a liblber-2.4.so.2 11 /opt/freeware/lib libldap.a libldap-2.4.so.2

Now, examine the libcurl.a.

# dump -X32_64 -Hv /opt/freeware/lib64/libcurl.a INDEX PATH BASE MEMBER 0 /opt/freeware/lib64:/opt/freeware/lib:/usr/lib:/lib 1 libgcc_s.a shr.o 2 libssh2.a libssh2.so.1 3 /opt/freeware/lib libgssapi_krb5.a libgssapi_krb5.so 4 /opt/freeware/lib libkrb5.a libkrb5.so 5 /opt/freeware/lib libk5crypto.a libk5crypto.so 6 /opt/freeware/lib libcom_err.a libcom_err.so 7 /opt/freeware/lib liblber.a liblber-2.4.so.2 8 /opt/freeware/lib libldap.a libldap-2.4.so.2 9 libc.a shr_64.o 10 libssl.a libssl.so.1.0.2 11 libcrypto.a libcrypto.so.1.0.2 12 libz.a libz.so.1 13 libpthreads.a shr_xpg5_64.o

The /opt/freeware/lib64/libcurl.a module fails to load because libssl.so.1.0.2 is not found in /opt/freeware/lib/libssl.a.

The module loads the first libssl.a in its search path. The error indicates it loads /opt/freeware/lib/libssl.a, which does not provide the libssl.so.1.0.2 dependency.

Now determine the source of the curl program.

# rpm -qi --whatprovides `which curl` \| egrep "Name\|Package\|Build Host" Name : curl Build Host : pokndd5.pok.stglabs.ibm.com Packager : IBM AIX Toolbox <https://ibm.biz/AIXToolbox>

This curl package is from the AIX Toolbox for Open Source Software. AIX Toolbox packages use the openssl.base file set. There is no openssl rpm package available on the Toolbox download.

Check the system for any libssl.a installed by installp.

# lslpp -w `lslpp -f \| grep libssl.a` File Fileset Type ---------------------------------------------------------------------------- /usr/lib/libssl.a openssl.base File

Examine the AIX libssl.a to ensure it provides the libssl.so.1.0.2 dependency.

# ar -tv /usr/lib/libssl.a rwxr-xr-x 0/0 728648 Jan 18 10:20 2021 libssl.so rwxr-xr-x 0/0 510766 Jan 18 10:20 2021 libssl.so.0.9.8 rwxr-xr-x 0/0 728648 Jan 18 10:20 2021 libssl.so.1.0.0 rwxr-xr-x 0/0 728648 Jan 18 10:12 2021 libssl.so.1.0.2

The AIX openssl.base libssl.a provides the libssl.so.1.0.2 member.

Now, examine the loaded library:

# ar -tv /opt/freeware/lib/libssl.a rwxr-xr-x 203/1 603254 May 03 16:39 2016 libssl.so.1.0.1 rw-r--r-- 203/1 362538 May 03 16:40 2016 libssl.so.0.9.7 rw-r--r-- 203/1 528217 May 03 16:40 2016 libssl.so.0.9.8 rwxr-xr-x 203/1 580902 May 03 16:40 2016 libssl.so.1.0.0

The loaded libssl.a does not provide the libssl.so.1.0.2 member.

Determine the source of the loaded libssl.a.

# rpm -qi --whatprovides /opt/freeware/lib/libssl.a \| egrep "Name\|Package\|Build Host" Name : openssl Build Host : aix51.perzl.org

Root Cause:

A non-AIX Toolbox libssl.a is loaded instead of the AIX openssl.base libssl.a.

The built-in library search path for the AIX Toolbox curl (per dump -Hv) is:

/opt/freeware/lib64:/opt/freeware/lib64:/opt/freeware/lib:/usr/lib:/lib

If non-AIX toolbox libraries exist in this path, errors might occur.

Solution:

Remove any openssl package, and use the AIX provided openssl.base to support AIX Toolbox for Open Source Software.

You might bypass this error, for curl, by adding /usr/lib to the front of the path. However, it is not recommended to set this path because AIX file set files could conflict with Open Source packages.

For example, xmllint would fail due to its dependency on the libxml2.so.2 provided by the libxml2-2.9.11-1.ppc package.

# LIBPATH=/usr/lib:$LIBPATH # ./xmllint exec(): 0509-036 Cannot load program xmllint_64 because of the following errors: 0509-130 Symbol resolution failed for xmllint_64 because: 0509-136 Symbol _GLOBAL__AIXI_libxml2_so (number 49) is not exported from dependent module /usr/lib/libxml2.a[libxml2.so.2]. 0509-136 Symbol _GLOBAL__AIXD_libxml2_so (number 50) is not exported from dependent module /usr/lib/libxml2.a[libxml2.so.2]. 0509-136 Symbol xmlSchemaValidateSetFilename (number 169) is not exported from dependent module /usr/lib/libxml2.a[libxml2.so.2]. 0509-192 Examine .loader section symbols with the 'dump -Tv' command.

SUPPORT
RPM packages from the AIX Toolbox for Open Source Software site are not supported through AIX support. AIX support does not provide answers about usage, compatibility, or dependencies for this package. Cases opened to address AIX Toolbox problems are canceled, and users are referred to the discussion forum. For all questions or issues with AIX Toolbox for Open Source Software packages, support is provided through the A IX Open Source Community Discussion forum. The AIX Open Source development team provides 'best effort' support through the forum, only. They answer questions, if possible, but they don't own the packages, or formally support them. For more information about support, see Resolving AIX Open Source Package and Application Issues. For true expertise in usage of the package, you can consult the open source community. There is a compiled list of communities on the AIX Open Source Community blog: OSS Project Community Links Consult your application vendor support references to determine version, installation, and configuration requirements.

Related Information

IBM Support Community

Learn more about "Getting IBM Support" here

AIX Open Source Community Discussion forum

Downloading and Installing or Upgrading OpenSSL and OpenSSH

Resolving AIX Open Source Package and Application Issues

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Document Information

More support for:
AIX

Component:
AIX Open Source->Package Tips

Software version:
All Versions

Document number:
6573579

Modified date:
12 October 2022

UID

ibm16573579

IBM Support

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