/usr/share/systemtap/tapset/init.stp is in systemtap-common 3.1-3ubuntu0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | // 'init' is a probe alias to run as early as possible, using begin(INT64_MIN).
// That runs it before all other begin probes, but still after basic internal
// initialization -- notably after any -G foo=bar values are set.
probe init = begin(-9223372036854775808) {}
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