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Description of problem:
The simple empty systemtap probe on scheduler_tick cause the kernel RHEL4U4 kernel to crash:

#stap -v -e 'probe kernel.function("scheduler_tick") {}'

There was a suggestion by Chuck Ebbert to fix this problem.

http://lkml.org/lkml/2006/6/19/106

The question is Ebbert's suggestions a reasonable fix to the problem?




Version-Release number of selected component (if applicable):
kernel-2.6.9-42.0.3.EL, 

How reproducible:
Always


Steps to Reproduce:
1. Install the needed kernel-debuginfo, kernel-devel, and sysetmtap
2. As root run: stap -v -e 'probe kernel.function("scheduler_tick") {}'


Actual Results:
Machine crashes with following messages on console:

Linux slingshot.devel.redhat.com 2.6.9-37.EL #1 Fri May 19 17:55:44 EDT 2006
i686 athlon i386 GNU/Linux

Kernel panic - not sync: kernel/module.c:2114:
spin_lock(kernel/module.c:c036b280) already locked by kernel/module.c:2114

 Badness in panic at kernel/panic.c:118

Expected Results:
Probe runs until user hits control-c. No crash.

Additional info: