Comment 0 for bug 1754078

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 available.

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

$> stap -L 'kernel.function("reparent_leader")'
kernel.function("reparent_leader@/build/linux-r9581B/linux-4.13.0/kernel/exit.c:632")

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)
https://sourceware.org/ml/systemtap/2017-q4/msg00096.html