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Re: Systemtap user space probing issue - Unknown symbol in module


On 07/19/2016 10:47 AM, buddhika chamith wrote:
> Please find it attached. I don't have sudo access to this particular
> machine at the moment. But let me know if this is not enough
> information without running as root.
> 
> On Tue, Jul 19, 2016 at 11:30 AM, Frank Ch. Eigler <fche@redhat.com> wrote:
>>
>> chamibuddhika wrote:
>>
>>> [...]
>>> [7681057.827483] stap_610f349f374e883560aeeb9de1523c1f__13285: Unknown
>>> symbol __tracepoint_sched_process_exit (err 0)
>>> [...]
>>
>> This is reminiscent of
>> https://www.sourceware.org/ml/systemtap/2016-q2/msg00082.html but
>> those incompatibilities were worked out in a stap version << 3.0.
>> Could you submit a fuller 'stap-report' output?

What's odd is that according to your 'stap-report' output, your kernel
has CONFIG_TRACEPOINTS=y, but systemtap can't register the tracepoints
it needs.

Can you try 'perf list tracepoint' as root and see what you get?

One more thing. You said earlier you were running systemtap 3.0. It
appears that you have systemtap 2.3 installed. Did you build systemtap
3.0 yourself?

-- 
David Smith
dsmith@redhat.com
Red Hat
http://www.redhat.com
256.217.0141 (direct)
256.837.0057 (fax)


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