Re: stap server is not able to use

[Martin Cermak <mcermak@redhat.com>]

Hi Eric,

systemtap packages come with stap-prep command that should do it for you:

https://sourceware.org/systemtap/SystemTap_Beginners_Guide/using-systemtap.html#using-setup

Depending on your environment, modern stap-prep may use debuginfod
for you.  That way you might have needed debugging information
available without actually installing the debuginfo RPMs.

https://sourceware.org/elfutils/Debuginfod.html

Hope this helps,

Martin


On  Mon  2023-12-04  13:57 , Lee Eric wrote:
> Hi Martin,
> 
> Thanks for your reply and it seems no connection error on the compile
> server. However, do we have any updated steps on how to install kernel
> debuginfo RPM packages? I searched a lot and seems old methods to use
> debuginfo-install command does not work.
> 
> Hui
> 
> On Mon, Dec 4, 2023 at 4:08 AM Martin Cermak <mcermak@redhat.com> wrote:
> >
> > Hi Eric,
> >
> > On  Sun  2023-12-03  13:03 , Lee Eric via Systemtap wrote:
> > > Hi,
> > >
> > > I just noticed my stap scripts need to run via stap-server and I
> > > followed the doc link https://sourceware.org/systemtap/wiki/SecureBoot
> > > to set up stap server. However, I feel like the error messages from
> > > the stap command is really odd:
> > >
> > > # stap --list-server=all
> > > ...
> > >  host=thinkpad01.local address=127.0.0.1 port=44621
> > > sysinfo="6.5.10-300.fc39.x86_64 x86_64" version=5.0
> > > certinfo="00:c1:73:c9:a1"
> > >  host=thinkpad01.local address=127.0.0.1 port=44621
> > > sysinfo="6.5.10-200.fc38.x86_64 x86_64" version=5.0
> > > certinfo="00:c1:73:c9:a1"
> > >  host=thinkpad01.local address=127.0.0.1 port=44621
> > > sysinfo="6.3.8-200.fc38.x86_64 x86_64" version=5.0
> > > certinfo="00:c1:73:c9:a1"
> > >  host=thinkpad01.local address=127.0.0.1 port=44621
> > > sysinfo="6.3.8-100.fc37.x86_64 x86_64" version=5.0
> > > certinfo="00:c1:73:c9:a1"
> > >  host=thinkpad01.local address=127.0.0.1 port=44621
> > > sysinfo="6.3.12-200.fc38.x86_64 x86_64" version=5.0
> > > certinfo="00:c1:73:c9:a1"
> > >  host=thinkpad01.local address=127.0.0.1 port=44621
> > > sysinfo="6.5.9-200.fc38.x86_64 x86_64" version=5.0
> > > certinfo="00:c1:73:c9:a1"
> > > ...
> > >
> > > And I'm using Fedora 39, so I would like to test if stap can connect
> > > to a server regardless the stap command ONLY accepting
> > > hostname/ip/cert serial which they are all the same.
> > >
> > > # stap -vvv --use-server=127.0.0.1:44621 -e 'probe begin { exit() }'
> > > ...
> > > Session arch: x86_64 release: 6.5.10-300.fc39.x86_64
> > > Build tree: "/lib/modules/6.5.10-300.fc39.x86_64/build"
> > > Using a compile server.
> > > Running sh -c cd '/tmp/stapvTSXTA/client' && zip -qr
> > > '/tmp/stapvTSXTA/client.zip' *
> > > Spawn waitpid result (0x0): 0
> > > Servers matching 127.0.0.1:44621:
> > >  host=unknown address=127.0.0.1 port=44621 sysinfo="unknown"
> > > version=unknown certinfo="unknown"
> > > All specified servers:
> > >  host=unknown address=127.0.0.1 port=44621 sysinfo="unknown"
> > > version=unknown certinfo="unknown"
> > > Unable to connect to a server.
> > > Passes: via server ? using 264956virt/19200res/16128shr/2424data kb,
> > > in 0usr/0sys/4real ms.
> > > Passes: via server failed.  Try again with another '-v' option.
> > > The kernel on your system requires modules to be signed for loading.
> > > The module created by compiling your script must be signed by a
> > > systemtap compile-server.  [man stap-server]
> > > ...
> > >
> > > What's the meaning of that error exactly? Why stap cannot match one
> > > server in this case? I also did wireshark and I'm sure stap didn't
> > > talk to the tcp port 44621
> > >
> > > Is there any clue about this usage? Any help would be appreciated.
> >
> > I think you are missing a `stap --trust-servers ...` step.  We
> > have a simple testcase for stap server in Fedora CI:
> >
> > https://src.fedoraproject.org/rpms/systemtap/blob/rawhide/f/tests/Sanity/stap-server-basic-sanity/runtest.sh
> >
> > One of relatively fresh logs showing how it worked on Fedora 39
> > is here:
> >
> > https://artifacts.dev.testing-farm.io/9d3c8552-145d-424f-a4fb-ddda1f5ef58e/work-ci1wn81l3u/plans/ci/execute/data/guest/default-0/tests/Sanity/stap-server-basic-sanity-32/output.txt
> >
> > Hope this helps,
> > Martin
> >
>