imac的终端中进行gdb调试，打好断点后，运行报错，这是什么原因？

Question

我写了简单的.c和makefile，通过HomeBrew安装的gdb，版本是GNU gdb (GDB) 8.1，打断点后运行就报错了，报错如下：请教各位是什么原因，多谢了！

localhost:skx_learn shikaixun$ gdb sort
GNU gdb (GDB) 8.1
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Reading symbols from sort...done.
(gdb) b 4
Breakpoint 1 at 0x100000dc5: file main.c, line 4.
(gdb) r
Starting program: /Users/shikaixun/skx_learn/sort
[New Thread 0x1803 of process 674]
[New Thread 0x2803 of process 674]
During startup program terminated with signal SIGTRAP, Trace/breakpoint trap.