Re: Generating Instrumentation for Other Computers

[Arkady <arkady dot miasnikov at gmail dot com>]

Another piece of information. When running with verbose output among
other things I am getting

Created temporary directory "/tmp/stapqv5YN0"
Session arch: x86_64 release: 2.6.32-71.7.1.el6.x86_64
Parsed kernel "/home/arkady/debuginfo/./usr/src/kernels/2.6.32-71.7.1.el6.x86_64/.config",
containing 2952 tuples
Parsed kernel "/home/arkady/debuginfo/./usr/src/kernels/2.6.32-71.7.1.el6.x86_64/Module.symvers",
containing 5083 vmlinux exports
Parsed kernel "/home/arkady/debuginfo/./usr/src/kernels/2.6.32-71.7.1.el6.x86_64/System.map",
containing 25650 symbols
Processing tapset "/usr/share/systemtap/tapset/linux/context.stpm"
......
Searched: "/usr/share/systemtap/tapset/*.stp", found: 26, processed: 26
Processing tapset "/home/arkady/agent/LinuxAgent/tapset/dentry.stp"
Processing tapset "/home/arkady/agent/LinuxAgent/tapset/sysfs.stp"
Processing tapset "/home/arkady/agent/LinuxAgent/tapset/task.stp"
Searched: "/home/arkady/agent/LinuxAgent/tapset/*.stp", found: 3, processed: 3
Pass 1: parsed user script and 114 library script(s) using
207088virt/34908res/3232shr/32000data kb, in 200usr/30sys/224real ms.
Attempting to extract kernel debuginfo build ID from
/home/arkady/debuginfo/./usr/src/kernels/2.6.32-71.7.1.el6.x86_64/vmlinux.id



On Wed, Mar 1, 2017 at 1:20 PM, Arkady <arkady.miasnikov@gmail.com> wrote:
> Hi,
>
> I am trying to create a build environment for generating the kernel
> modules for other computers. My goal is to have a chroot with multiple
> kernel-devel/debuginfo packages.
> I started by following
> https://sourceware.org/systemtap/SystemTap_Beginners_Guide/cross-compiling.html
> I downloaded and installed packages for 2.6.32-71.7.1.el6.x86_64 (a
> random pick of the kernel) manually using
>
> rpm --force  -ivh  kernel-debuginfo-2.6.32-71.7.1.el6.x86_64.rpm
> kernel-debuginfo-common-x86_64-2.6.32-71.7.1.el6.x86_64.rpm
> kernel-devel-2.6.32-71.7.1.el6.x86_64.rpm
>
> After that I tried
>
> stap -r 2.6.32-71.7.1.el6.x86_64 -p4 <script_name>.stp
>
> I am getting
>
> semantic error: missing x86_64 kernel/module debuginfo [man
> warning::debuginfo] under
> '/home/arkady/debuginfo/usr/src/kernels/2.6.32-71.7.1.el6.x86_64'
>
> I tried to specify --root in the command to rpm and avoid --force this
> way. STAP command is
> stap -r <root here>/usr/src/kernels/2.6.32-71.7.1.el6.x86_64 -p4
> <script_name>.stp
>
> It did not solve the problem. This is how my
> usr/src/kernels/2.6.32-71.7.1.el6.x86_64/ looks like
>
> Makefile   Module.symvers  arch   crypto   firmware  include  ipc
> lib  net      scripts   sound  usr Makefile.common  System.map
> block  drivers  fs        init     kernel  mm   samples  security
> tools  virt
>
> and /usr/src/kernels/2.6.32-642.el6.x86_64/kernel/
>
> Kconfig.freezer  Kconfig.hz  Kconfig.preempt  Makefile  events  gcov
> irq  power  time  trace
>
> I went on to the file dwflpp.cxx and tried to figure out what is
> missing - my theory was that some symlink can solve the problem. From
> the source code it appears that dwfl_module_getdwarf() fails to parse
> the module (or found it).
>
> What module?
>
> Thank you, Arkady.