[Bug runtime/17126] tracepoints.exp testcase causing stalls/hang on ppc64

["hemkshaw at in dot ibm.com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17126

--- Comment #7 from hemkshaw at in dot ibm.com <hemkshaw at in dot ibm.com> ---
Thanks Frank, I installed the kernel-debuginfo and kernel-debuginfo-common
packages for the required kernel.
But, even after installation of kernel-debuginfo-3.10.0-123.el7.ppc64 package,
the problem still persists.

# rpm -qa | grep kernel-debuginfo
kernel-debuginfo-3.10.0-123.el7.ppc64
kernel-debuginfo-common-ppc64-3.10.0-123.el7.ppc64

# stap -l' kernel.trace("hcall_*")'
#

I looked into /proc/kallsysms to find where this hcall related symbols differ
from others, but the hcall related symbols and hrtimer related symbols were
similar. 
The /proc/kallsyms have entries for __tracepoint_ptr_hcall_entry and
__tracepoint_ptr_hrtimer_init.

I strace'd stap to try and find out where actually stap is failing to find the
hcall_* events, but stap is going through all the usual files it needs. So far,
 I didn't notice anything unusual on the strace o/p.

Thanks,
Hemant

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