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According to this comment in #1880: https://github.com/topjohnwu/Magisk/issues/1880#issuecomment-546657588 If Linux recycled our PPID, and coincidentally the process that reused the PPID is root, AND init wants to kill the whole process group, magiskd will get killed as a result. There is no real way to block a SIGKILL signal, so we simply make sure our daemon PID is the process group leader by renaming the directory. Close #1880