c - 使用带有核心文件的 gdb 进行调试时输出消息不清晰

Question

我在 ubuntu 12.04 上使用 gdb 调试我的 c 代码，下面是命令:

msz@ubuntu:~$ gdb m core

运行上述命令后，我得到以下消息:

warning: Can't read pathname for load map: Input/output error.

warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7fff8cdfe000
Core was generated by `./m'.
Program terminated with signal 11, Segmentation fault.
#0  0x0000000000400962 in matmultunopt ()

这两个警告是什么意思？从最后一行可以得出什么结论，即

#0  0x0000000000400962 in matmultunopt ()

当然，它给出了一些提示，表明 matmultunopt() 中存在一些问题，但是什么是:

#0  0x0000000000400962

警告实际上告诉我什么？

更新

现在我使用 -g 执行此操作并收到以下消息:

warning: Can't read pathname for load map: Input/output error.

warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7fffde2c8000
Core was generated by `./m'.
Program terminated with signal 11, Segmentation fault.
#0  0x0000000000400962 in matmultunopt (matrix1=0x3, matrix2=0xd7d030, 
    resultant=0xd7d050, rows1=2, colmns1=2, rows2=2, colmns2=2)
    at mattmgpuf1.c:115
115         {   double a = matrix1[i*rows2 + k];

仍然，我无法理解给定行的含义:

 #0  0x0000000000400962 in matmultunopt (matrix1=0x3, matrix2=0xd7d030, 
        resultant=0xd7d050, rows1=2, colmns1=2, rows2=2, colmns2=2)

Answer 1

调试器的输出解释:

#0  0x0000000000400962 in matmultunopt (matrix1=0x3, matrix2=0xd7d030, resultant=0xd7d050, rows1=2, colmns1=2, rows2=2, colmns2=2) at mattmgpuf1.c:115
^^  ^----------------^    ^----------^  ^---------------------------------------------------------------------------------------^     ^--------------^
|   |                     |             |                                                                                             |
|   |                     |             |                                                                                             +-- source file name and line where the program stopped
|   |                     |             +-- current function's parameters and their values
|   |                     +-- current function
|   +-- program address
+-- stack/call level