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Some startup-time scripts may need uprobes.ko build/installed/loaded on RHEL<7, but the initscript doesn't know to whether/how to do this.

Patches posted upstream:
https://sourceware.org/ml/systemtap/2014-q3/msg00133.html

Reproduced with systemtap-2.5-5.el6:

===== 
[root@dell-per320-01 script.d]# cat tracels.stp 
probe process("/bin/ls").function("main") {println(pp(), "blah ")}
[root@dell-per320-01 script.d]#
[root@dell-per320-01 script.d]# service systemtap start
Starting systemtap:  Compiling tracels ... done
 Starting tracels ... error
[FAILED]
===== 

Plus Console output is

=====
tracels: Unknown symbol register_uprobe
tracels: Unknown symbol unmap_uretprobe
tracels: Unknown symbol register_uretprobe
tracels: Unknown symbol unmap_uprobe
tracels: Unknown symbol unregister_uprobe
=====

Verified with systemtap-2.7-2.el6.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-1333.html