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

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

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

--- Comment #10 from ocket8888 <ocket8888 at gmail dot com> ---
(In reply to David Smith from comment #4)
> (In reply to ocket8888 from comment #0)
> > Created attachment 10770 [details]
> > 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'
> 
> Interesting. I'm betting the '-lt' tag is going to show up in the filenames
> installed by one (or more) of the kernel-lt packages. Pay close attention to
> the following packages: kernel-lt, kernel-lt-debuginfo, and kernel-lt-devel.
> Does '-lt' show up in any of the filenames from those packages?
> 
> If so, an semi-easy workaround here would be to create a symbolic link from
> the path systemtap expects to the path containing '-lt'.
> 
> If I'm right, I'm not sure what the best solution to this problem would be
> in systemtap to automatically recognize the '-lt' kernels.

Here's what I got:

```
    $ repoquery -l kernel-lt-`uname -r` | grep -e "-lt"
    /etc/ld.so.conf.d/kernel-lt-4.9.70-1.el7.centos.x86_64.conf
```

the devel package installs nothing with '-lt' in the name, while the debuginfo
package dumped too much stuff to paste, but what might be the issue is
everything it puts under /usr/src is under a 'kernel-lt-4.9.70' directory.

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