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There are so many possibilities to kill frozen programs in linux.
https://www.fosslinux.com/39434/5-things-to-do-when-your-linux-system-gui-freezes.htm
The one thing they’re missing, which honestly shouldn’t happen on at least desktop distros, is the system becoming unresponsive under memory pressure because before the kernel decides to kill off anything it rather swaps its own data structures out to disk, grinding everything to such a crawl that it’s indistinguishable from a complete freeze.
The solution is early OOM, which is more aggressive at killing things off and it honestly should be installed and activated by default.
and of course psDooM