[Bug kprobes/22772] New: missing kernel/module debuginfo for custom lt kernel

["ocket8888 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22772

            Bug ID: 22772
           Summary: missing kernel/module debuginfo for custom lt kernel
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: kprobes
          Assignee: systemtap at sourceware dot org
          Reporter: ocket8888 at gmail dot com
  Target Milestone: ---

Created attachment 10770
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10770&action=edit
kernel configuration

I've been trying (and failing) to get systemtap to work on my CentOS machine.
```
    $ uname -a
    Linux ipcdn-cache-51.cdnlab.comcast.net 4.9.70-1.el7.centos.x86_64 #1 SMP
Thu Feb 1 15:34:43 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
    $ cat /etc/centos-release```
    CentOS Linux release 7.4.1708 (Core)
    $ stap --version
    Systemtap translator/driver (version 3.1/0.168, rpm 3.1-5.el7_4)
Copyright (C) 2005-2017 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
tested kernel versions: 2.6.18 ... 4.10-rc8
enabled features: AVAHI BOOST_STRING_REF DYNINST JAVA PYTHON2 LIBRPM LIBSQLITE3
LIBVIRT LIBXML2 NLS NSS READLINE
```

I'm attaching the configuration used to build the kernel, note that it follows
the configuration specified in the FAQ (Q2). When I run the test command `stap
-ve 'probe vfs.read{exit()}` it outputs

```
    Pass 1: parsed user script and 529 library scripts using
378212virt/192180res/6484shr/188296data kb, in 2030usr/40sys/2078real ms.
    semantic error: while resolving probe point: identifier 'kernel' at
/usr/share/systemtap/tapset/linux/vfs.stp:915:18
        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: resolution failed in alias expansion builder

    semantic error: while resolving probe point: identifier 'vfs' at
<input>:1:7
            source: probe vfs.read{exit()}
                          ^

    semantic error: no match

    Pass 2: analyzed script: 0 probes, 0 functions, 0 embeds, 0 globals using
393364virt/210976res/10668shr/202812data kb, in 150usr/120sys/271real ms.
    Pass 2: analysis failed.  [man error::pass2]
```

However, I can show that I have installed all of the necessary packages:

```
    $ yum list installed | grep kernel
    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
```

note that the version numbers and release numbers match `uname -r`. As per the
FAQ (Q3), I've also verified that the kernel exists under /boot/:

```
    $ ls /boot/ | grep `uname -r`
    config-4.9.70-1.el7.centos.x86_64
    initramfs-4.9.70-1.el7.centos.x86_64.img
    symvers-4.9.70-1.el7.centos.x86_64.gz
    System.map-4.9.70-1.el7.centos.x86_64
    vmlinuz-4.9.70-1.el7.centos.x86_64
```

I'm not sure what else would be helpful, but I'm certainly willing to provide
any more information on request.

I suspect the problem has something to do with the fact that I'm using an lt
kernel, as `stap-prep` seems to be looking for the incorrect packages.

```
    ...
    No package kernel-4.9.70-1.el7.centos.x86_64 available.
    No package kernel-devel-4.9.70-1.el7.centos.x86_64 available.
    No package kernel-debuginfo-4.9.70-1.el7.centos.x86_64 available.
    ...
```

not to mention that the proper - kernel-lt-* - packages are installed as noted
above.

To put it simply: what do?

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