You can reproduce a kernel oom-kill of a specific  progress using oom_adj
and  the magic-sysrq hotkey or file.

For example, to make pid $pid get oomkilled, you can do the following:

$ echo 1000 | sudo tee /proc/$pid/oom_score_adj
$ echo f | sudo tee /proc/sysrq-trigger

This assumes you haven't adjusted the oom score for any other pids
significantly up (unlikely) and that you have CONFIG_MAGIC_SYSRQ in your
kernel (very likely).

Another way to do it would be to run the process in a specific cgroup (e.g.
with cgexec) and enforce a very low memory limit on that cgroup, and that's
probably a bit more robust though also a little more complicated.

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