[Bug 1766754] Re: Linux kernel > 4.14 requires systemtap 3.2

[Tyler Hicks]

Here's the output from systemtap 3.1-3, under the Ubuntu
4.15.0-20.21-generic kernel, showing failure to build the module.

** Attachment added: "stap-bad.txt"
   https://bugs.launchpad.net/ubuntu/+source/systemtap/+bug/1766754/+attachment/5127252/+files/stap-bad.txt

** Description changed:

  [Impact]
  
  systemtap cannot be used in Ubuntu 18.04 due to kernel ABI
  incompatibilities with the 4.15 based kernel. The upstream kernel
  changes are:
  
  - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7eeb6b893bd28c68b6d664de1d3120e49b855cdb
  - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d3a024abbc43827785
  
  [Test Case]
  
  Load an example systemtap script to verify that it can be built and used
  with the Ubuntu 18.04 kernel.
+ 
+ $ sudo stap -v -e 'probe kernel.function("proc_dostring")
+ {printf("proc_dostring() called\n"); exit()}'
+ 
+ In another terminal, execute 'cat /proc/sys/kernel/hostname' and the
+ stap command should print "proc_dostring() called" and exit. See the
+ stap-bad.txt and stap-good.txt attachments for example output.
  
  [Regression Potential]
  
  Low regression potential since the package does not currently work as-
  is.
  
  [Original Bug Report]
  
  Per https://sourceware.org/bugzilla/show_bug.cgi?id=22158 , Systemtap
  3.1 is broken on kernel versions > 4.14. It looks like they're aware of
  this in the debian package : https://bugs.debian.org/cgi-
  bin/bugreport.cgi?bug=892995 .  With Bionic Beaver about to ship with
  kernel 4.15 and systemtap 3.1-3, systemtap will be unusable on the LTS
  of Ubuntu.
  
  $ lsb_release -rd
  Description:	Ubuntu Bionic Beaver (development branch)
  Release:	18.04
  $ uname -a
  Linux appliance 4.15.0-19-generic #20-Ubuntu SMP Sun Apr 22 00:03:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  $ apt-cache policy systemtap
  systemtap:
    Installed: 3.1-3
    Candidate: 3.1-3
    Version table:
   *** 3.1-3 500
          500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
          100 /var/lib/dpkg/status

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https://bugs.launchpad.net/bugs/1766754

Title:
  Linux kernel > 4.14 requires systemtap 3.2

Status in systemtap package in Ubuntu:
  New

Bug description:
  [Impact]

  systemtap cannot be used in Ubuntu 18.04 due to kernel ABI
  incompatibilities with the 4.15 based kernel. The upstream kernel
  changes are:

  - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7eeb6b893bd28c68b6d664de1d3120e49b855cdb
  - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d3a024abbc43827785

  [Test Case]

  Load an example systemtap script to verify that it can be built and
  used with the Ubuntu 18.04 kernel.

  $ sudo stap -v -e 'probe kernel.function("proc_dostring")
  {printf("proc_dostring() called\n"); exit()}'

  In another terminal, execute 'cat /proc/sys/kernel/hostname' and the
  stap command should print "proc_dostring() called" and exit. See the
  stap-bad.txt and stap-good.txt attachments for example output.

  [Regression Potential]

  Low regression potential since the package does not currently work as-
  is.

  [Original Bug Report]

  Per https://sourceware.org/bugzilla/show_bug.cgi?id=22158 , Systemtap
  3.1 is broken on kernel versions > 4.14. It looks like they're aware
  of this in the debian package : https://bugs.debian.org/cgi-
  bin/bugreport.cgi?bug=892995 .  With Bionic Beaver about to ship with
  kernel 4.15 and systemtap 3.1-3, systemtap will be unusable on the LTS
  of Ubuntu.

  $ lsb_release -rd
  Description:	Ubuntu Bionic Beaver (development branch)
  Release:	18.04
  $ uname -a
  Linux appliance 4.15.0-19-generic #20-Ubuntu SMP Sun Apr 22 00:03:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  $ apt-cache policy systemtap
  systemtap:
    Installed: 3.1-3
    Candidate: 3.1-3
    Version table:
   *** 3.1-3 500
          500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
          100 /var/lib/dpkg/status

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