参考：http://www.cnblogs.com/ahuo/category/72819.html      http://blog.csdn.net/tenfyguo/article/details/8159176      http://blog.csdn.net/ylyuanlu/article/details/9115159  一.进程产生进程coredump必备条件： ulimit-c  x     x取值 [4,unlimited]二.生成coredump文件 1.指定格与路径生产coredump:需要自已健立mkdir -p /data/coredump目录,并且用户有写权限 echo “/data/coredump/core.%e.%p" > /proc/sys/kernel/core_pattern     =========》core.xx.4944进程 Core_pattern的格式 说明%% 单个%字符%p 所dump进程的进程ID%u 所dump进程的实际用户ID%g 所dump进程的实际组ID%s 导致本次core dump的信号%t core dump的时间 (由1970年1月1日计起的秒数)%h 主机名%e 程序文件名 2.默认生成格式（程序的当前工作目录,chdir可能改变当前目录,不一定是程序的运行目录)[root@localhost ~]# cat /proc/sys/kernel/core_patterncore文件格式示例：core.5592三.示例

 

gcc -g -Wall xx.c -oxx   有调试符号 [root@localhost ~]# cat -n xx.c     1     2     3  #include 
     
           4     5  void func(char *p)     6  {     7  *p = 'p';     8  }     9    10  int main(int argc, char *argv[])    11  {    12  char *p=NULL;    13  func(p);    14    15  return 0;    16  }
     

 

[root@localhost ~]# ./xxSegmentation fault (core dumped)

 

[root@localhost ~]# gdb ./xx  ./core.5650GNU gdb (GDB) 7.7Copyright (C) 2014 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-unknown-linux-gnu".Type "show configuration" for configuration details.For bug reporting instructions, please see:
      .Find the GDB manual and other documentation resources online at:
      .For help, type "help".Type "apropos word" to search for commands related to "word"...Reading symbols from ./xx...done.[New LWP 5650]Core was generated by `./xx'.Program terminated with signal SIGSEGV, Segmentation fault.#0  0x0000000000400454 in func (p=0x0) at xx.c:77       *p = 'p';(gdb) list23       #include 
      
       45       void func(char *p)6       {7       *p = 'p';8       }910      int main(int argc, char *argv[])11      {(gdb) 12      char *p=NULL;13      func(p);1415      return 0;16      }(gdb) Line number 17 out of range; xx.c has 16 lines.
      
     

[root@localhost ~]# file core.5650core.5650: ELF 64-bit LSB core file AMD x86-64, version 1 (SYSV), SVR4-style, from 'xx' [root@localhost ~]# readelf -h core.5650ELF Header:  Magic:   7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00   Class:                             ELF64  Data:                              2's complement, little endian  Version:                           1 (current)  OS/ABI:                            UNIX - System V  ABI Version:                       0  Type:                              CORE (Core file)  Machine:                           Advanced Micro Devices X86-64  Version:                           0x1  Entry point address:               0x0  Start of program headers:          64 (bytes into file)  Start of section headers:          0 (bytes into file)  Flags:                             0x0  Size of this header:               64 (bytes)  Size of program headers:           56 (bytes)  Number of program headers:         16  Size of section headers:           0 (bytes)  Number of section headers:         0  Section header string table index: 0

 

gcc xx.c -oxx  无调试符号 [root@localhost ~]# gdb ./xx  ./core.5687GNU gdb (GDB) 7.7Copyright (C) 2014 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-unknown-linux-gnu".Type "show configuration" for configuration details.For bug reporting instructions, please see:
      .Find the GDB manual and other documentation resources online at:
      .For help, type "help".Type "apropos word" to search for commands related to "word"...Reading symbols from ./xx...(no debugging symbols found)...done.[New LWP 5687]Core was generated by `./xx'.Program terminated with signal SIGSEGV, Segmentation fault.#0  0x0000000000400454 in func () -------------------------------------------------------------------------------(gdb) listNo symbol table is loaded.  Use the "file" command. (gdb) disas 0x0000000000400454    Dump of assembler code for function func:   0x0000000000400448 <+0>:     push   %rbp   0x0000000000400449 <+1>:     mov    %rsp,%rbp   0x000000000040044c <+4>:     mov    %rdi,-0x8(%rbp)   0x0000000000400450 <+8>:     mov    -0x8(%rbp),%rax=> 0x0000000000400454 <+12>:    movb   $0x70,(%rax)   0x0000000000400457 <+15>:    leaveq    0x0000000000400458 <+16>:    retq   End of assembler dump.(gdb) bt#0  0x0000000000400454 in func ()#1  0x0000000000400479 in main ()