Help

Help

[Fieck, Brennan]

I need help installing/using systemtap, is this a good place to ask?

Re: Help

[Vratislav Bendel]

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
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

Re: [EXTERNAL] Re: Help

[Fieck, Brennan]

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

Re: [EXTERNAL] Re: Help

[Fieck, Brennan]

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

Re: [EXTERNAL] Re: Help

[Arkady]

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
>

Re: [EXTERNAL] Re: Help

[Fieck, Brennan]

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
>

Re: [EXTERNAL] Re: Help

[Arkady]

Fieck,

Make sure that you install at least 3 RPM packages

kernel-debuginfo-2.6.32-642.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-642.el6.x86_64.rpm
kernel-devel-2.6.32-642.el6.x86_64.rpm

Try something like
mkdir -p /lib/modules/$KERNEL_VERSION/
rm -f /lib/modules/$KERNEL_VERSION/build
ln -s /usr/src/kernels/$KERNEL_VERSION /lib/modules/$KERNEL_VERSION/build


On Thu, Jun 14, 2018 at 6:49 PM, Fieck, Brennan
<Brennan_Fieck@comcast.com> wrote:
> 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
>>
>

Re: [EXTERNAL] Re: Help

[Frank Ch. Eigler]

"Fieck, Brennan" <Brennan_Fieck@comcast.com> writes:

> [...]
> $ 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

Rather than this search, how about

% rpm -ql kernel-lt-debuginfo | grep vmlinux

It would not surprise me if that custom kernel build ended up missing
some of the debuginfo.  The kernel.spec files that do this are deep
magic.

Have you tested stap on your box, but with a normal distro kernel
and its normal debuginfo?


- FChE

Re: [EXTERNAL] Re: Help

[Fieck, Brennan]

I got one hit on that:

/usr/src/debug/kernel-lt-4.9.70/linux-4.9.70-1.el7.centos.x86_64/tools/perf/tests/vmlinux-kallsyms.c

I've never tested on this specific machine with a normal kernel, but I have used stap before on an Ubuntu
VM.
________________________________________
From: Frank Ch. Eigler <fche@redhat.com>
Sent: Thursday, June 14, 2018 10:10 AM
To: Fieck, Brennan
Cc: Vratislav Bendel; systemtap@sourceware.org
Subject: Re: [EXTERNAL] Re: Help

"Fieck, Brennan" <Brennan_Fieck@comcast.com> writes:

> [...]
> $ 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

Rather than this search, how about

% rpm -ql kernel-lt-debuginfo | grep vmlinux

It would not surprise me if that custom kernel build ended up missing
some of the debuginfo.  The kernel.spec files that do this are deep
magic.

Have you tested stap on your box, but with a normal distro kernel
and its normal debuginfo?


- FChE

Re: [EXTERNAL] Re: Help

[Frank Ch. Eigler]

Hi -

> I got one hit on that:
> 
> /usr/src/debug/kernel-lt-4.9.70/linux-4.9.70-1.el7.centos.x86_64/tools/perf/tests/vmlinux-kallsyms.c

There should also be a large /vmlinux file.

- FChE