pwntools中使用tmux和gdb attach时Waiting for debugger无限等待的解决方案

解决方案
那么稍微修改一下源码即可。即找到了tracer就不用在while了，直接退出循环就完事了~
vim /usr/local/lib/python3.6/dist-packages/pwnlib/util/proc.py，然后把wait_for_debugger函数换成下面这个。（其实只改动了一小点，所以手动修改两三行就行）

#/usr/local/lib/python3.6/dist-packages/pwnlib/util/proc.py

def wait_for_debugger(pid, debugger_pid=None):
    """wait_for_debugger(pid, debugger_pid=None) -> None

    Sleeps until the process with PID `pid` is being traced.
    If debugger_pid is set and debugger exits, raises an error.
    
    Arguments:
        pid (int): PID of the process.
    
    Returns:
        None
    """
    t = Timeout()
    with t.countdown(timeout=15):
        with log.waitfor('Waiting for debugger') as l:
            while debugger_pid:
                debugger = psutil.Process(debugger_pid)
                #while t.timeout and tracer(pid) is None:
                # 新增加
                if tracer(pid) is not None: break
                try:
                    debugger.wait(0.01)
                except psutil.TimeoutExpired:
                    pass
                else:
                    debugger_pid = 0
            else:
                while t.timeout and tracer(pid) is None:
                    time.sleep(0.01)
    
        if tracer(pid):
            l.success()
        elif debugger_pid == 0:
            l.failure("debugger exited! (maybe check /proc/sys/kernel/yama/ptrace_scope)")
        else:
            l.failure('Debugger did not attach to pid %d within 15 seconds', pid)