Questions about the shellcode about webkit-regex-exploit HOT 2 CLOSED

Your shellcode won't work because Safari is sandboxed, you first need a Sandbox Escape to run shell commands.
The reason why you get the crash is that the syscall fails and you're not returning a valid value from your shellcode.
If you want to debug using lldb, you need to attach to WebContent, not Safari. WebContent is the Process that runs JavaScript and displays the website. Note that there will be one WebContent process for each open Tab.

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Thank you very much. @LinusHenze

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