Public bug reported:

Due to ubuntu kernel (Ubuntu 4.13.0-36.40-generic 4.13.13) being
compiled with ""-fno-var-tracking-assignments", the debug symbols
produced are of lesser quality, i.e. $context variables are not

E.g.: (systemtap needs to be installed on the system)

$> stap -L 'kernel.function("reparent_leader")'

on Fedora (Linux 4.15.6-300.fc27.x86_64) the same command gives:
kernel.function("reparent_leader@kernel/exit.c:632") $dead:struct list_head* 
$p:struct task_struct* $father:struct task_struct*

more info:
SystemTap Release notes (known issues)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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  reenable full variable debugging information within dbgsyms with gcc
  vta cflags

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