queue_work(system_dfl_wq, &unix_gc_work
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Unix GC Remastered
Introduction The AF_UNIX garbage collector is an interesting piece of the kernel. It exists because sockets can be sent with SCM_RIGHTS but they can become unreachable from user-space while still being kept alive by the kernel, which is not memory efficient; in this situation, the garbage collector intervenes to free them. Not long ago, the subsystem was rewritten from scratch on top of a graph/Strongly-Connected-Components model; but it is still bug prone.