Re: Using systemtap

[Adrien Kunysz <adrien at kunysz dot be>]

On Wed, Dec 22, 2010 at 03:25:34PM +0100, Sloot, Hans-Peter wrote:
> I want to use systemtap and installed rpm's
> systemtap-0.9.7-5.el5
> systemtap-runtime-0.9.7-5.el5
> kernel-debuginfo-common-2.6.18-164.el5.x86_64.rpm
> kernel-debuginfo-2.6.18-164.el5.x86_64.rpm
> 
> I cannot find the correct kernel-devel rpm.
> 
> uname -a gives as kernel 2.6.18-164.0.0.0.1

This looks strange. I would expect uname -r to say 2.6.18-164.el5.

> I have the following questions:
> 1.Did I install the correct rpm's?

kernel-devel-2.6.18-164.el5.x86_64 is missing.

> 2.Where can I find the correct kernel-devel?

It should be on Red Hat Network (well, 2.6.18-164.0.0.0.1
probably isn't but 2.6.18-164.el5 probably is).

> 3.Can it be omitted?

Only if you compiled the stap modules on a system that has it.
See http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/SystemTap_Beginners_Guide/cross-compiling.html

> 4.
> When running script probe kernel.function("*") {}
> I get the errors below:
> Pass 1: parsed user script and 52 library script(s) in
> 250usr/0sys/265real ms.
> semantic error: libdwfl failure (missing x86_64 kernel/module debuginfo
> under '/lib/modules/2.6.18-164.0.0.0.1.el5xen/build'): No such file or
> directory while resolving probe point kernel.function("*")
> semantic error: no probes found
> Pass 2: analyzed script: 0 probe(s), 0 function(s), 0 embed(s), 0
> global(s) in 0usr/0sys/6real ms.
> Pass 2: analysis failed.  Try again with another '--vp 01' option.
> 
> Is that due to the missing kernel-devel package or is something else
> wrong?

It looks like kernel-debuginfo and kernel-devel for that version are
missing. I am not sure where you got version 2.6.18-164.0.0.0.1
because it doesn't sound like something that was every built by Red Hat
and if it was, I doubt it has ever been released.

What does "rpm -qa | grep kernel" say? What version are you booting on
(as per grub.conf).

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