1. 设置core文件路径在当前工作目录

echo "core-%e-%p-%t" > /proc/sys/kernel/core_pattern

具体参数

%s - insert signal that caused the coredump into the filename 添加导致产生core的信号
%t - insert UNIX time that the coredump occurred into filename 添加core文件生成时的unix时间
%h - insert hostname where the coredump happened into filename 添加主机名
%e - insert coredumping executable name into filename 添加导致产生core的命令
%p - insert pid into filename 添加pid
%u - insert current uid into filename 添加uid
%g - insert current gid into filename 添加gid

2. 查看core文件设置大小限制

ulimit -c

3. 设置core文件大小

ulimit -c filesize
exp:

    ulimit -c 100M
    
    ulimit -c unlimited

gdb调试指令

编译一个测试程序

    #include<stdio.h>
    int coredump_next()
    {
            int *ptr = NULL;
          *ptr = 101;
          return 0;
    }
    
    int coredump(){
            return coredump_next();
    }
    
    int main()
    {
        return coredump();
    }

1. bt执行