/usr/share/systemtap/runtime/linux/autoconf-nameidata.c is in systemtap-common 2.3-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #include <linux/namei.h>
struct nameidata nd __attribute__ ((unused)) = {.path={(void *)0}};
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