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Assuming that you are new about debugging tools, I give you simple example with GDB or LLDB. Just attach to a running process by like this command, and then insert breakpoints.
gdb -p $PROCESS_ID
lldb attach -p $PROCESS_ID
ps aux | grep gzserver
After a process was attached, you can use debugger commands. (e.g. set breakpoints, stepwise execution, continue. blah blah)
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