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When executing Remote Commands on spacewalk CentOS 5 clients, it allways returns with: Fatal error in Python code occurred [[6]]" (code -1)

Looking from clients /var/log/up2date it shows Invalid Syntax error:
[Fri Feb 17 14:59:45 2017] up2date D: handle_action{'action': "<?xml version='1.0'?>\n<methodCall>\n<methodName>script.run</methodName>\n<params>\n<param>\n<value><int>44250</int></value>\n</param>\n<param>\n<value><struct>\n<member>\n<name>username</name>\n<value><string>root</string></value>\n</member>\n<member>\n<name>groupname</name>\n<value><string>root</string></value>\n</member>\n<member>\n<name>now</name>\n<value><string>2017-02-17 14:58:54</string></value>\n</member>\n<member>\n<name>timeout</name>\n<value><int>600</int></value>\n</member>\n<member>\n<name>script</name>\n<value><string>#!/bin/sh\n# Add your shell script below\nid</string></value>\n</member>\n</struct></value>\n</param>\n</params>\n</methodCall>\n", 'version': 2, 'id': 44250}
[Fri Feb 17 14:59:45 2017] up2date D: handle_action actionid = 44250, version = 2
[Fri Feb 17 14:59:45 2017] up2date D: do_call script.run(44250, {'username': 'root', 'groupname': 'root', 'now': '2017-02-17 14:58:54', 'timeout': 600, 'script': '#!/bin/sh\n# Add your shell script below\nid'}){'cache_only': None}
[Fri Feb 17 14:59:45 2017] up2date 
Traceback (most recent call last):
  File "/usr/sbin/rhn_check", line 381, in __run_action
    (status, message, data) = CheckCli.__do_call(method, params, kwargs)
  File "/usr/sbin/rhn_check", line 373, in __do_call
    method = getMethod.getMethod(method, "/usr/share/rhn/", "actions")
  File "/usr/share/rhn/up2date_client/getMethod.py", line 83, in getMethod
    actions = __import__(modulename)
exceptions.SyntaxError: invalid syntax (script.py, line 52)

[Fri Feb 17 14:59:45 2017] up2date D: Sending back response((6,), 'Fatal error in Python code occurred', {})

Same remote command under CentOS 6 and 7 runs ok without errors.

Reproducible: Didn't try




Spacewalk server is installed on CentOS 7.3, and uses Spacewalk v2.6 repository. 

Clients are CentOS 5/6/7 versions and only CentOS 5.x spacewalk clients gives this error. I tested to run Remote Command on CentOS 6 and CentOS 7 and they run ok.

CentOS 5 spacewalk client RPM versions:
spacewalk-client-repo-2.6-0.el5
spacewalk-backend-usix-2.6.75-1.el5
rhn-org-trusted-ssl-cert-1.0-1
rhncfg-5.10.99-1.el5
rhncfg-actions-5.10.99-1.el5
rhn-setup-2.6.8-1.el5
rhnlib-2.6.3-1.el5
rhncfg-client-5.10.99-1.el5
yum-rhn-plugin-2.6.3-1.el5
rhn-check-2.6.8-1.el5
rhn-client-tools-2.6.8-1.el5
rhnsd-5.0.25-1.el5