The only way to get rid of them is to either make the parent process call waitpid() on them, or by terminating the parent process. Killing them – even with SIGKILL – has no effect. Zombie processes do not consume memory or CPU. Zombie processes show up in ps and on Linux they have “” appended to their names. Formally, a zombie process as defined by Unix operating systems is a process that has already exited, but its parent process has not waited for its exit yet. Frozen processes are sometimes also called zombie processes, but this is not formally correct. This article attempts to be generic, but will also provide Ruby-specific tips. How is Phusion Passenger’s frozen process killing fix implemented, and under what constraints does it work?.Why was Phusion Passenger not immune to the problem of frozen processes?.Phusion Passenger) automatically cleanup frozen processes?
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