Re: [EXTERNAL] Re: Help

["Fieck, Brennan" <Brennan_Fieck@comcast.com>]

Arkady,

As you can see in the output of my `yum list installed` command, I do have the debuginfo package (and headers and devel)
for my kernel installed, but systemtap can't seem to find them for some reason.

Also, idk if it makes a difference, but I'm actually running CentOS 7.4, not 6
________________________________________
From: larytet@gmail.com <larytet@gmail.com> on behalf of Arkady <arkady.miasnikov@gmail.com>
Sent: Thursday, June 14, 2018 9:33 AM
To: Fieck, Brennan
Cc: Vratislav Bendel; systemtap@sourceware.org
Subject: Re: [EXTERNAL] Re: Help

Fieck,

Assuming CentOS look for the RPM package with the debuginfo

http://debuginfo.centos.org/6/x86_64/
http://mirror.centos.org/centos-6/6.8/updates/x86_64/Packages/
http://vault.centos.org/6.4/updates

On Thu, Jun 14, 2018 at 6:16 PM, Fieck, Brennan
<Brennan_Fieck@comcast.com> wrote:
> Whoops, it left out my screenfetch info, here's a hosted link: http://pix.toile-libre.org/upload/original/1528989347.png
>
> ________________________________
> From: Fieck, Brennan
> Sent: Thursday, June 14, 2018 8:51 AM
> To: Vratislav Bendel
> Cc: systemtap@sourceware.org
> Subject: Re: [EXTERNAL] Re: Help
>
>
> Bendel,
>
>
> Thanks for responding. I installed the 'systemtap' package via yum, but it wasn't working, so I built from source
>
> to get a more up-to-date version (3.1 -> 3.3). The problem I'm having is that systemtap can't find my kernel's
>
> debug symbols. Here's some relevant information:
>
>
> $ stap --version
>
> Systemtap translator/driver (version 3.3/0.168, non-git sources)
> Copyright (C) 2005-2018 Red Hat, Inc. and others
> This is free software; see the source for copying conditions.
> tested kernel versions: 2.6.18 ... 4.18-rc0
> enabled features: BPF JAVA PYTHON2 PYTHON3 LIBRPM LIBVIRT LIBXML2 NLS
>
>
> $ screenfetch
>
> [X]
>
>
> $ yum list installed | grep kernel
>
> kernel-debug.x86_64        3.10.0-693.21.1.el7 @centos-base
> kernel-devel.x86_64        3.10.0-693.21.1.el7 @centos-base/7.4.1708
> kernel-lt.x86_64           4.9.67-1.el7.centos @cdn-Addons
> kernel-lt.x86_64           4.9.70-1.el7.centos installed
> kernel-lt-debuginfo.x86_64 4.9.70-1.el7.centos installed
> kernel-lt-devel.x86_64     4.9.70-1.el7.centos installed
> kernel-lt-headers.x86_64   4.9.70-1.el7.centos installed
> kernel-lt-tools.x86_64     4.9.70-1.el7.centos installed
> kernel-lt-tools-libs.x86_64
> kernel-lt-tools-libs-devel.x86_64
>
>
> $ repoquery -l kernel-lt-debuginfo
>
> 29407
>
>
> $ repoquery -l kernel-lt-debuginfo | cut -d '/' --fields=1,2,3,4,5 | sort | uniq
>
> /usr/lib/debug
> /usr/lib/debug/.build-id
> /usr/lib/debug/.dwz
> /usr/lib/debug/lib
> /usr/lib/debug/usr
> /usr/src/debug/kernel-lt-4.9.70
>
>
> $ sudo stap -e 'probe vfs.read { exit(); }'
>
> semantic error: while resolving probe point: identifier 'kernel' at /usr/local/share/systemtap/tapset/linux/vfs.stp:962:18
>         source: probe vfs.read = kernel.function("vfs_read")
>                                  ^
>
> semantic error: missing x86_64 kernel/module debuginfo [man warning::debuginfo] under '/lib/modules/4.9.70-1.el7.centos.x86_64/build'
>
> semantic error: while resolving probe point: identifier 'vfs' at <input>:1:7
>         source: probe vfs.read { exit(); }
>                       ^
>
> semantic error: no match
>
> Pass 2: analysis failed.  [man error::pass2]
>
>
>
> ________________________________
> From: Vratislav Bendel <vbendel@redhat.com>
> Sent: Thursday, June 14, 2018 8:03 AM
> To: Fieck, Brennan
> Cc: systemtap@sourceware.org
> Subject: [EXTERNAL] Re: Help
>
> Hello Fieck,
>
> Firstly you need to install the systemtap package via package manager
> (depending on what linux-distro you have the command would be for example 'yum' or 'dnf' or 'apt-get' ...)
>
> Then the basics are pretty easy. I'd recommend you to read through the Tutorial available at sourceware.org<http://sourceware.org>
> and try out some of the simple scripts described there (At least that's how I started learning how to use it :) ).
>
> The tutorial:
> https://sourceware.org/systemtap/tutorial.pdf<https://sourceware.org/systemtap/tutorial.pdf>
>
> Additionally, systemtap is very well documented in it's "man-pages"
> and also in other documents at https://sourceware.org/systemtap/documentation.html
>
> Also note that there might be additional packages you'd need to install like 'kernel-devel' and 'kernel-debuginfo',
> however systemtap itself will tell you exactly when you run it.
>
> I hope this will be helpful to you.
>
> Best regards,
> Vratislav Bendel
>