Coredump Fault Analysis

If a program runs for 3 days before it goes wrong, this time

Do we have to use GDB to debug the program for 3 days?

At this point we need to use the core dump:

1, Core dump is also called kernel dump. When an exception occurs while the program is running, the Linux system can store the contents of the memory in a core file when the program goes wrong

, this process is called core Dump.

2. What kind of mistake does core dump use to deal with? It is mainly a segment error (segment fault) ...

The general performance is: A. Array access out of bounds B. Access null pointer c. stack Overflow d. Modify read-only memory

3. On Linux systems, the core dump function is turned off by default, but can be turned on/off via the Ulimit command

Open: Ulimit-c Unlimited

Close: ulimit-c 0

4. After core dump occurs, you can use GDB to view the contents of the core file and locate the error location of the program

Usage: GDB Program name core file name

GdB./test core.122223

5. Complete Example:

Gdb-c core.id Program Name

Input: Where. You can know who is calling and which line is down in which function.

or enter BT

Coredump Fault Analysis