GDB 7.0后加入了Reversal Debugging功能。具体来说，比如我在getbuf()和main()上设置了断点，当启动程序时会停在main()函数的断点上。此时敲入record后continue到下一断点getbuf()，GDB就会记录从main()到getbuf()的运行时信息。现在用rn就可以逆向地从getbuf()调试到main()。就像《X战警：逆转未来》里一样，挺神奇吧！
这种方式适合从bug处反向去找引起bug的代码，实用性因情况而异。当然，它也是有局限性的。像程序假如有I/O输出等外部条件改变时，GDB是没法“逆转”的。
[root@ bufbomb]# gdb bufbomb GNU gdb (GDB) Red Hat Enterprise Linux (7.2-75.el6) Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu". For bug reporting instructions, please see: <>... Reading symbols from /root/Temp/bufbomb/bufbomb...done. (gdb) b getbuf Breakpoint 1 at 0x8048ad6 (gdb) b main Breakpoint 2 at 0x80490c6 (gdb) run -t cdai The program being debugged has been started already. Start it from the beginning? (y or n) y Starting program: /root/Temp/bufbomb/bufbomb -t cdai Breakpoint 2, 0x080490c6 in main () (gdb) record (gdb) c Continuing. Team: cdai Cookie: 0x5e5ee04e Breakpoint 1, 0x08048ad6 in getbuf () (gdb) rn Single stepping until exit from function getbuf, which has no line number information. 0x08048dad in test () (gdb) rn Single stepping until exit from function test, which has no line number information. 0x08049080 in launch () (gdb) rn Single stepping until exit from function launch, which has no line number information. 0x08049252 in main ()GDB+GDBserver无源码调试Android 动态链接库的技巧
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