我不知道为什么我看不到这种回溯。加载我自己的二进制文件中的符号，并安装包libc6-dbg。我是否需要告诉gdb在哪里找到libc符号？
Program received signal SIGSEGV, Segmentation fault.
__memcpy_ia32 () at ../sysdeps/i386/i686/multiarch/../memcpy.S:74
74 ../sysdeps/i386/i686/multiarch/../memcpy.S: No such file or directory.
(gdb) bt full
#0 __memcpy_ia32 () at ../sysdeps/i386/i686/multiarch/../memcpy.S:74
No locals.
#1 0x00000000 in ?? ()
No symbol table info available.
(gdb)