[Bug translator/27410] New: rpm-set path based probes

[Bug translator/27410] New: rpm-set path based probes

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27410

            Bug ID: 27410
           Summary: rpm-set path based probes
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com
  Target Milestone: ---

Bug #25568's introduced capabilities to specify probes by build-id, but this is
not very user friendly.  What users tend to see directly are file names, and
occasionally filenames from archives that are not even installed.

The attachment is a demonstration prototype for a stap front-end that can take
a path name and a list of RPM-containing directories.  It computes a
buildid-based script template based on finding all buildids for the given path
name in any of the RPMs found, and then compiles than via stap -p4.  It uses a
temporary instance of debuginfod to build/serve the buildid executables /
debuginfo.

% sh stap-multirpm /usr/bin/vi /path/to/RPMs
[starts debuginfod -R /path/to/RPMs ...]
[chance to edit template SCRIPT.stp]
[compiles to stap_hexcode.ko]
[kills debuginfod]
% sudo staprun stap_hexcode.ko &
% /usr/bin/vi   # of any version from any of those RPMs
[watch stap probe hit]


We should consider growing some native systemtap syntax for this.  Suggestions
welcome.  Possibility:

probe rpmsearch("/path/to/RPMs/prefix*").process("/path/name").function(...) {
}
probe debsearch(...) { }

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[Bug translator/27410] rpm-set path based probes

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27410

Frank Ch. Eigler <fche at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fche at redhat dot com

--- Comment #1 from Frank Ch. Eigler <fche at redhat dot com> ---
Created attachment 13221
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13221&action=edit
proof of concept shell script

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[Bug translator/27410] rpm-set path based probes

[rgoldber at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27410

Ryan Goldberg <rgoldber at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rgoldber at redhat dot com

--- Comment #2 from Ryan Goldberg <rgoldber at redhat dot com> ---
Created attachment 14322
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14322&action=edit
Submit A Patch for 27410

The following expands on the original proposal. This patch allows for the user
to probe processes similarly to regular process("PATH").** probes but instead
searches the current federation of debuginfod servers instead of the host file
system.

The new syntax which would achieve the original task is as follows:
$ debuginfod -R /path/to/RPMs/prefix
$ env DEBUGINFOD_URLS=http://localhost:8002/ stap -e 
'probe debuginfod.process("/path/name").function(...) { }'

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[Bug translator/27410] rpm-set path based probes

[rgoldber at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27410

Ryan Goldberg <rgoldber at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Ryan Goldberg <rgoldber at redhat dot com> ---
commit  a2d19c8670690f87ee74db4a106829aa8edefbce
Author: Ryan Goldberg <rgoldber@redhat.com>     
Date:   Fri, 25 Aug 2023 14:20:09 +0000 (10:20 -0400)

PR27410: Probe processes using debuginfod

New tapset which allows for process
probing using executables/debuginfo
stored in debuginfod servers.

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