{"id":3332,"date":"2017-06-02T22:55:02","date_gmt":"2017-06-02T14:55:02","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=3332"},"modified":"2017-06-06T19:29:33","modified_gmt":"2017-06-06T11:29:33","slug":"linux%e4%b8%8b%e7%9a%84%e3%80%8csegmentation-fault-core-dumped%e3%80%8d","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/3332.html","title":{"rendered":"Linux\u4e0b\u7684\u300cSegmentation fault (core dumped)\u300d"},"content":{"rendered":"

=Start=<\/p>\n

\u7f18\u7531\uff1a<\/h4>\n

\u6700\u8fd1\u4e00\u6bb5\u65f6\u95f4\u5728Linux\u4e0b\u7528C\u8bed\u8a00\u505a\u4e00\u4e9b\u5f00\u53d1\u5de5\u4f5c\uff0c\u4f46\u662f\u7531\u4e8e\u5b9e\u9645\u7ecf\u9a8c\u4e0d\u8db3\uff0c\u95ee\u9898\u6bd4\u8f83\u591a\u3002\u5176\u4e2d\u6bb5\u9519\u8bef\u5c31\u662f\u8ba9\u4eba\u975e\u5e38\u5934\u75db\u7684\u4e00\u4e2a\u95ee\u9898\u3002\u6240\u4ee5\u5c31\u501f\u6b64\u673a\u4f1a\u7cfb\u7edf\u5b66\u4e60\u4e86\u4e00\u4e0b\uff0c\u8fd9\u91cc\u5bf9Linux\u73af\u5883\u4e0b\u7684\u6bb5\u9519\u8bef(Segmentation fault)\u505a\u4e2a\u5c0f\u7ed3\uff0c\u65b9\u4fbf\u4ee5\u540e\u9047\u5230\u7c7b\u4f3c\u95ee\u9898\u597d\u8fdb\u884c\u6392\u67e5\u4e0e\u89e3\u51b3\u3002<\/p>\n

\u6b63\u6587\uff1a<\/h4>\n

\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n
\u4ec0\u4e48\u662f\u6bb5\u9519\u8bef\uff1f(what&why)<\/h6>\n

\u4e0b\u9762\u662f\u6765\u81ea Answers.com<\/a> \u7684\u5b9a\u4e49\uff1a<\/p>\n

A segmentation fault (often shortened to segfault) is a particular error condition that can occur during the operation of computer software. In short, a segmentation fault occurs when a program attempts to access a memory location that it is not allowed to access, or attempts to access a memory location in a way that is not allowed<\/span> (e.g., attempts to write to a read-only location, or to overwrite part of the operating system). Systems based on processors like the Motorola 68000 tend to refer to these events as Address or Bus errors.<\/p>\n

Segmentation is one approach to memory management and protection in the operating system. It has been superseded by paging for most purposes, but much of the terminology of segmentation is still used, \u201csegmentation fault\u201d being an example. Some operating systems still have segmentation at some logical level although paging is used as the main memory management policy.<\/p>\n

On Unix-like operating systems, a process that accesses invalid memory receives the SIGSEGV signal. On Microsoft Windows, a process that accesses invalid memory receives the STATUS_ACCESS_VIOLATION exception.<\/p><\/blockquote>\n

\u5bf9\u7167\u7684\u4e2d\u6587\u89e3\u91ca\uff1a<\/p>\n

\u6240\u8c13\u7684\u6bb5\u9519\u8bef\u5c31\u662f\u6307\u8bbf\u95ee\u7684\u5185\u5b58\u8d85\u51fa\u4e86\u7cfb\u7edf\u7ed9\u8fd9\u4e2a\u7a0b\u5e8f\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u901a\u5e38\u8fd9\u4e2a\u503c\u662f\u7531 gdtr \u6765\u4fdd\u5b58\u7684\uff0c\u5b83\u662f\u4e00\u4e2a 48 \u4f4d\u7684\u5bc4\u5b58\u5668\uff0c\u5176\u4e2d\u7684 32 \u4f4d\u662f\u4fdd\u5b58\u7531\u5b83\u6307\u5411\u7684 gdt \u8868\uff0c\u540e 13 \u4f4d\u4fdd\u5b58\u76f8\u5e94\u4e8e gdt \u7684\u4e0b\u6807\uff0c\u6700\u540e 3 \u4f4d\u5305\u62ec\u4e86\u7a0b\u5e8f\u662f\u5426\u5728\u5185\u5b58\u4e2d\u4ee5\u53ca\u7a0b\u5e8f\u7684\u5728 cpu \u4e2d\u7684\u8fd0\u884c\u7ea7\u522b\uff0c\u6307\u5411\u7684 gdt \u662f\u7531\u4ee5 64 \u4f4d\u4e3a\u4e00\u4e2a\u5355\u4f4d\u7684\u8868\uff0c\u5728\u8fd9\u5f20\u8868\u4e2d\u5c31\u4fdd\u5b58\u7740\u7a0b\u5e8f\u8fd0\u884c\u7684\u4ee3\u7801\u6bb5\u4ee5\u53ca\u6570\u636e\u6bb5\u7684\u8d77\u59cb\u5730\u5740\u4ee5\u53ca\u4e0e\u6b64\u76f8\u5e94\u7684\u6bb5\u9650\u548c\u9875\u9762\u4ea4\u6362\u8fd8\u6709\u7a0b\u5e8f\u8fd0\u884c\u7ea7\u522b\u8fd8\u6709\u5185\u5b58\u7c92\u5ea6\u7b49\u7b49\u7684\u4fe1\u606f\u3002\u4e00\u65e6\u4e00\u4e2a\u7a0b\u5e8f\u53d1\u751f\u4e86\u8d8a\u754c\u8bbf\u95ee\uff0ccpu \u5c31\u4f1a\u4ea7\u751f\u76f8\u5e94\u7684\u5f02\u5e38\u4fdd\u62a4\uff0c\u4e8e\u662f segmentation fault \u5c31\u51fa\u73b0\u4e86\u3002<\/span><\/p><\/blockquote>\n

\u901a\u8fc7\u4e0a\u9762\u7684\u89e3\u91ca\uff0c\u6bb5\u9519\u8bef\u5e94\u8be5\u5c31\u662f\u8bbf\u95ee\u4e86\u4e0d\u53ef\u8bbf\u95ee\u7684\u5185\u5b58\uff0c\u8fd9\u4e2a\u5185\u5b58\u7a7a\u95f4\u8981\u4e48\u662f\u4e0d\u5b58\u5728\u7684\uff0c\u8981\u4e48\u662f\u53d7\u5230\u7cfb\u7edf\u4fdd\u62a4\u7684\u3002<\/p>\n

\u5e38\u89c1\u6bb5\u9519\u8bef\u4e3e\u4f8b<\/h6>\n

\u8bbf\u95ee\u4e0d\u5b58\u5728\u7684\u5185\u5b58\u5730\u5740<\/strong><\/p>\n

\n
\n
\n
\n\n\n\n
\n
\n
#include <stdio.h><\/code><\/div>\n
#include <stdlib.h><\/code><\/div>\n
void<\/code> main()<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code> *ptr = NULL;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>*ptr = <\/code>0<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\u5206\u6790\uff1a\u8bbf\u95ee\u5185\u5b58\u5730\u5740\u4e0d\u5b58\u5728(\u8fd9\u91cc\u662fNULL)\u7684\u5730\u65b9\u2014\u2014\u5f15\u7528\u7a7a\u6307\u9488\u3002<\/p>\n

\u8bbf\u95ee\u53d7\u7cfb\u7edf\u4fdd\u62a4\u7684\u5185\u5b58\u5730\u5740<\/strong><\/p>\n

\n
\n
\n
\n\n\n\n
\n
\n
#include <stdio.h><\/code><\/div>\n
#include <stdlib.h><\/code><\/div>\n
void<\/code> main()<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code> *ptr = (<\/code>int<\/code> *)<\/code>0<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>*ptr = <\/code>100<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\u5206\u6790\uff1a\u4e0a\u9762\u7684\u90a3\u6bb5\u4ee3\u7801\u8bd5\u56fe\u5f80\u5185\u5b58\u5730\u5740\u4e3a0\u7684\u5730\u65b9\u8fdb\u884c\u5199\u5165\u3002<\/p>\n

\u5c1d\u8bd5\u5bf9\u53ea\u8bfb\u5185\u5b58\u8fdb\u884c\u5199\u5165<\/strong><\/p>\n

\n
\n
\n
\n\n\n\n
\n
\n
#include <stdio.h><\/code><\/div>\n
#include <stdlib.h><\/code><\/div>\n
#include <string.h><\/code><\/div>\n
void<\/code> main()<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>char<\/code> *ptr = <\/code>\"test\"<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>*ptr = <\/code>\"TEST\"<\/code>; <\/code>\/\/ \u6216 strcpy(ptr, \"TEST\");<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\u5206\u6790\uff1aptr \u88ab\u5b9a\u4e49\u6210\u4e86 \u201ctest\u201d\uff0c\u662f\u4e00\u4e2a\u53ea\u8bfb\u7684\u5185\u5b58\u6bb5\uff0c\u4e0d\u80fd\u76f4\u63a5\u5199\u5165\uff0c\u8981\u5199\u5165\u9700\u8981\u7528 malloc \u4ece\u5806\u4e2d\u5206\u914d\u6216\u8005\u5b9a\u4e49\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\u3002<\/p>\n

\u6808\u6ea2\u51fa<\/strong><\/p>\n

\n
\n
\n
\n\n\n\n
\n
\n
#include <stdio.h><\/code><\/div>\n
#include <stdlib.h><\/code><\/div>\n
void<\/code> main()<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>main();<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\u5206\u6790\uff1a\u4e0a\u9762\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u6b7b\u5faa\u73af\u7684\u9012\u5f52\u8c03\u7528\uff0c\u4f1a\u9020\u6210\u6808\u6ea2\u51fa\u3002<\/p>\n

printf\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u81f4<\/strong><\/p>\n

\n
\n
\n
\n\n\n\n
\n
\n
#include <stdio.h><\/code><\/div>\n
int<\/code> main() {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code> b = <\/code>10<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"%s\\n\"<\/code>, b);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code> 0<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\u5206\u6790\uff1a\u6253\u5370\u5b57\u4e32\u65f6\uff0c\u5b9e\u9645\u4e0a\u662f\u6253\u5370\u67d0\u4e2a\u5730\u5740\u5f00\u59cb\u7684\u6240\u6709\u5b57\u7b26\uff0c\u800c\u8fd9\u91cc\u628a\u6574\u6570\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u8fc7\u53bb\uff0c\u8fd9\u4e2a\u6574\u6570\u88ab\u5f53\u6210\u4e86\u4e00\u4e2a\u5730\u5740\uff0c\u7136\u540e printf \u4ece\u8fd9\u4e2a\u5730\u5740\u5f00\u59cb\u6253\u5370\u5b57\u7b26\uff0c\u76f4\u5230\u67d0\u4e2a\u4f4d\u7f6e\u4e0a\u7684\u503c\u4e3a \\0\u3002\u5982\u679c\u8fd9\u4e2a\u6574\u6570\u4ee3\u8868\u7684\u5730\u5740\u4e0d\u5b58\u5728\u6216\u8005\u4e0d\u53ef\u8bbf\u95ee\uff0c\u81ea\u7136\u4e5f\u662f\u8bbf\u95ee\u4e86\u4e0d\u8be5\u8bbf\u95ee\u7684\u5185\u5b58 \u2014\u2014 segmentation fault\u3002<\/p>\n

\u00a0<\/strong>scanf\u5fd8\u8bb0\u53d6\u5730\u5740\u7b26(&)<\/strong><\/p>\n

\n
\n
\n
\n\n\n\n
\n
\n
int<\/code> i;<\/code><\/div>\n
scanf(<\/code>\"%d\"<\/code>, i);<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\u5206\u6790\uff1ai \u88ab\u5b9a\u4e49\u540e\uff0c\u6570\u503c\u662f\u4e0d\u786e\u5b9a\u7684\uff0c\u800c scanf \u628a i \u7684\u503c\u5f53\u4f5c\u53c2\u6570\u4f20\u5165 scanf\uff0c\u800c scanf \u5219\u4f1a\u628a i \u5f53\u6210\u4e86\u5730\u5740\uff0c\u628a\u7528\u6237\u8f93\u5165\u7684\u5185\u5bb9\u5b58\u5165\u8be5\u5904\u3002\u800c\u8be5\u5730\u5740\u56e0\u4e3a\u968f\u673a\uff0c\u53ef\u80fd\u6839\u672c\u5c31\u4e0d\u5b58\u5728\u6216\u8005\u4e0d\u5408\u6cd5\u3002<\/p>\n

\u6570\u7ec4\u8d8a\u754c<\/strong><\/p>\n

\n
\n
\n
\n\n\n\n
\n
\n
#include <stdio.h><\/code><\/div>\n
int<\/code> main() {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>char<\/code> test[<\/code>1<\/code>];<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"%c\"<\/code>, test[<\/code>100000<\/code>]); <\/code>\/\/ \u5f53100000\u53d8\u5f97\u5f88\u5927\u65f6\uff0c\u53ef\u80fd\u4f1a\u5f15\u53d1\u300cBus error\u300d\u800c\u4e0d\u662f\u300cSegmentation fault\u300d<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code> 0<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\u5982\u4f55\u8c03\u8bd5\u6bb5\u9519\u8bef\uff1f(how)<\/h6>\n

1. \u4f7f\u7528printf\/fprintf\u8f93\u51fa\u4fe1\u606f\uff08\u8981\u6ce8\u610f\u53ef\u80fd\u7531printf\u5f15\u5165\u7684coredump\u95ee\u9898<\/span>\uff09<\/strong><\/p>\n

\u8fd9\u4e2a\u662f\u770b\u4f3c\u6700\u7b80\u5355\u4f46\u5f80\u5f80\u5f88\u591a\u60c5\u51b5\u4e0b\u5341\u5206\u6709\u6548\u7684\u8c03\u8bd5\u65b9\u5f0f\uff0c\u4e5f\u8bb8\u53ef\u4ee5\u8bf4\u662f\u7a0b\u5e8f\u5458\u7528\u7684\u6700\u591a\u7684\u8c03\u8bd5\u65b9\u5f0f\u3002\u7b80\u5355\u6765\u8bf4\uff0c\u5c31\u662f\u5728\u7a0b\u5e8f\u7684\u91cd\u8981\u4ee3\u7801\u9644\u8fd1\u52a0\u4e0a\u50cfprintf\u8fd9\u7c7b\u8f93\u51fa\u4fe1\u606f\uff0c\u8fd9\u6837\u53ef\u4ee5\u8ddf\u8e2a\u5e76\u6253\u5370\u51fa\u6bb5\u9519\u8bef\u5728\u4ee3\u7801\u4e2d\u53ef\u80fd\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002<\/p>\n

\u4e3a\u4e86\u65b9\u4fbf\u4f7f\u7528\u8fd9\u79cd\u65b9\u6cd5\uff0c\u53ef\u4ee5\u4f7f\u7528\u6761\u4ef6\u7f16\u8bd1\u6307\u4ee4#ifdef DEBUG\u548c#endif\u628aprintf\u51fd\u6570\u5305\u8d77\u6765\u3002\u8fd9\u6837\u5728\u7a0b\u5e8f\u7f16\u8bd1\u65f6\uff0c\u5982\u679c\u52a0\u4e0a-DDEBUG\u53c2\u6570\u5c31\u80fd\u67e5\u770b\u8c03\u8bd5\u4fe1\u606f\uff1b\u5426\u5219\u4e0d\u52a0\u8be5\u53c2\u6570\u5c31\u4e0d\u4f1a\u663e\u793a\u8c03\u8bd5\u4fe1\u606f\u3002<\/p>\n

2. \u4f7f\u7528gcc\u548cgdb<\/strong><\/p>\n

\n
\n
\n
\n\n\n\n
\n
\n
$ gcc -g segfault_1.c<\/code><\/div>\n
$ .\/a.out<\/code><\/div>\n
Segmentation fault (core dumped)<\/code><\/div>\n
$ gdb .\/a.out<\/code><\/div>\n
(gdb) run<\/code><\/div>\n
(gdb) bt<\/code><\/div>\n
(gdb) where<\/code><\/div>\n
(gdb) list<\/code><\/div>\n
(gdb) quit<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

1\u3001\u4ec5\u5f53\u80fd\u786e\u5b9a\u7a0b\u5e8f\u4e00\u5b9a\u4f1a\u53d1\u751f\u6bb5\u9519\u8bef\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\u3002
\n2\u3001\u5f53\u7a0b\u5e8f\u7684\u6e90\u7801\u53ef\u4ee5\u83b7\u5f97\u7684\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528`-g`\u53c2\u6570\u7f16\u8bd1\u7a0b\u5e8f\u3002
\n3\u3001\u4e00\u822c\u7528\u4e8e\u6d4b\u8bd5\u9636\u6bb5\uff0c\u751f\u4ea7\u73af\u5883\u4e0bgdb\u4f1a\u6709\u526f\u4f5c\u7528\uff1a\u4f7f\u7a0b\u5e8f\u8fd0\u884c\u51cf\u6162\uff0c\u8fd0\u884c\u4e0d\u591f\u7a33\u5b9a\uff0c\u7b49\u7b49\u3002
\n4\u3001\u5373\u4f7f\u5728\u6d4b\u8bd5\u9636\u6bb5\uff0c\u5982\u679c\u7a0b\u5e8f\u8fc7\u4e8e\u590d\u6742\uff0cgdb\u4e5f\u4e0d\u80fd\u5904\u7406\u3002<\/p>\n

3. \u4f7f\u7528core\u6587\u4ef6\u548cgdb<\/strong><\/p>\n

\n
\n
\n
\n\n\n\n
\n
\n
$ .\/a.out<\/code><\/div>\n
Segmentation fault (core dumped)<\/code><\/div>\n
$ gdb .\/a.out core.xxxx<\/code><\/div>\n
(gdb) bt<\/code><\/div>\n
(gdb) where<\/code><\/div>\n
(gdb) list<\/code><\/div>\n
(gdb) quit<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

1\u3001\u9002\u5408\u4e8e\u5728\u5b9e\u9645\u751f\u6210\u73af\u5883\u4e0b\u8c03\u8bd5\u7a0b\u5e8f\u7684\u6bb5\u9519\u8bef\uff08\u5373\u5728\u4e0d\u7528\u91cd\u65b0\u53d1\u751f\u6bb5\u9519\u8bef\u7684\u60c5\u51b5\u4e0b\u91cd\u73b0\u6bb5\u9519\u8bef\uff09\u3002
\n2\u3001\u6253\u5f00core\u6587\u4ef6\u7684\u5927\u5c0f\u9650\u5236(\u8bbe\u7f6e\u4e3a\u975e0\u503c)\u3002
\n3\u3001\u5f53\u7a0b\u5e8f\u5f88\u590d\u6742\uff0ccore\u6587\u4ef6\u76f8\u5f53\u5927\u65f6\uff0c\u8be5\u65b9\u6cd5\u4e0d\u53ef\u7528\u3002<\/p>\n

\n
\n
\n
\n\n\n\n
\n
\n
1<\/code>\u3001\u5728\u4e00\u4e9bLinux\u7248\u672c\u4e0b\uff0c\u9ed8\u8ba4\u662f\u4e0d\u4ea7\u751fcore\u6587\u4ef6\u7684\uff0c\u9996\u5148\u53ef\u4ee5\u67e5\u770b\u4e00\u4e0b\u7cfb\u7edfcore\u6587\u4ef6\u7684\u5927\u5c0f\u9650\u5236\uff1a<\/code><\/div>\n
$ ulimit -c<\/code><\/div>\n
0<\/code><\/div>\n
<\/div>\n
2<\/code>\u3001\u53ef\u4ee5\u770b\u5230\u9ed8\u8ba4\u8bbe\u7f6e\u60c5\u51b5\u4e0b\uff0c\u672c\u673aLinux\u73af\u5883\u4e0b\u53d1\u751f\u6bb5\u9519\u8bef\u65f6\u4e0d\u4f1a\u81ea\u52a8\u751f\u6210core\u6587\u4ef6\uff0c\u4e0b\u9762\u8bbe\u7f6e\u4e0bcore\u6587\u4ef6\u7684\u5927\u5c0f\u9650\u5236\uff08\u5355\u4f4d\u4e3aKB\uff09\uff1a<\/code><\/div>\n
$ ulimit -c <\/code>1024<\/code><\/div>\n
$ ulimit -c<\/code><\/div>\n
1024<\/code><\/div>\n
<\/div>\n
3<\/code>\u3001\u4fee\u6539 \/proc\/sys\/kernel\/core_pattern \u6587\u4ef6\uff0c\u6b64\u6587\u4ef6\u7528\u4e8e\u63a7\u5236Core\u6587\u4ef6\u4ea7\u751f\u7684\u6587\u4ef6\u540d\u548c\u6240\u5728\u4f4d\u7f6e\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6b64\u6587\u4ef6\u5185\u5bb9\u53ea\u6709\u4e00\u884c\u5185\u5bb9<\/code>\"core\"<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

4. \u4f7f\u7528objdump<\/strong><\/p>\n

\n
\n
\n
\n\n\n\n
\n
\n
dmesg<\/code><\/div>\n
objdump -d<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

5.1 \u4f7f\u7528catchsegv<\/strong><\/p>\n

catchsegv\u547d\u4ee4\u4e13\u95e8\u7528\u6765\u6251\u83b7\u6bb5\u9519\u8bef\uff0c\u5b83\u901a\u8fc7\u52a8\u6001\u52a0\u8f7d\u5668\uff08ld-linux.so\uff09\u7684\u9884\u52a0\u8f7d\u673a\u5236\uff08PRELOAD\uff09\u628a\u4e00\u4e2a\u4e8b\u5148\u5199\u597d\u7684\u5e93\uff08\/lib\/libSegFault.so\uff09\u52a0\u8f7d\u4e0a\uff0c\u7528\u4e8e\u6355\u6349\u65ad\u9519\u8bef\u7684\u51fa\u9519\u4fe1\u606f\u3002<\/p>\n

5.2 \u4f7f\u7528signal(SIGSEGV, handler)<\/strong><\/p>\n

\u4ea7\u751f\u6bb5\u9519\u8bef\u65f6\u4f1a\u4ea7\u751f\u4e00\u4e2aSIGSEGV\u4fe1\u53f7\u3002\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u6dfb\u52a0SIGSEGV\u7684\u5904\u7406\u51fd\u6570\u5728\u7a0b\u5e8f\u53d1\u751f\u6bb5\u9519\u8bef\u9000\u51fa\u4e4b\u524d\u505a\u4e00\u4e9b\u4e8b\u60c5\uff0c\u6211\u4eec\u751a\u81f3\u53ef\u4ee5\u4f7f\u7528backtrace(3)\u51fd\u6570\u6765\u4fdd\u5b58\u5f53\u524d\u6808\u5185\u5bb9\u3002<\/p>\n

\u5982\u4f55\u907f\u514d\u6bb5\u9519\u8bef\uff1f<\/h6>\n

\u7efc\u4e0a\uff1a<\/p>\n

    \n
  1. \u5b9a\u4e49\u4e86\u6307\u9488\u540e\u8bb0\u5f97\u521d\u59cb\u5316\uff0c\u5728\u4f7f\u7528\u65f6\u8bb0\u5f97\u5224\u65ad\u662f\u5426\u4e3a NULL<\/span><\/li>\n
  2. \u5728\u4f7f\u7528\u6570\u7ec4\u65f6\u8bb0\u5f97\u521d\u59cb\u5316\uff0c\u4f7f\u7528\u65f6\u8981\u68c0\u67e5\u6570\u7ec4\u4e0b\u6807\u662f\u5426\u8d8a\u754c\uff0c\u6570\u7ec4\u5143\u7d20\u662f\u5426\u5b58\u5728\u7b49<\/li>\n
  3. \u5728\u53d8\u91cf\u5904\u7406\u65f6\u53d8\u91cf\u7684\u683c\u5f0f\u63a7\u5236\u662f\u5426\u5408\u7406\u7b49<\/span><\/li>\n
  4. \u5728free\u6307\u9488\u4e4b\u524d\u8981\u8bb0\u5f97\u8fdb\u884c\u5224\u65ad<\/span><\/li>\n<\/ol>\n

    \u5176\u4ed6\u7684\u5c31\u9700\u8981\u6839\u636e\u7ecf\u9a8c\u4e0d\u65ad\u79ef\u7d2f\uff1b\u53e6\u5916\uff0c\u4e5f\u52a1\u5fc5\u638c\u63e1\u4e00\u4e9b\u57fa\u672c\u7684\u5206\u6790\u548c\u8c03\u8bd5\u624b\u6bb5\uff0c\u5373\u4f7f\u5728\u9047\u5230\u65b0\u7684\u8fd9\u7c7b\u95ee\u9898\u65f6\u4e5f\u77e5\u9053\u5982\u4f55\u5e94\u5bf9\u3002<\/strong><\/p>\n

    \u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n

    Linux\u73af\u5883\u4e0b\u6bb5\u9519\u8bef\u7684\u4ea7\u751f\u539f\u56e0\u53ca\u8c03\u8bd5\u65b9\u6cd5\u5c0f\u7ed3<\/strong><\/span> #\u5168\u9762\u7ec6\u81f4
    \nhttp:\/\/www.cnblogs.com\/panfeng412\/archive\/2011\/11\/06\/segmentation-fault-in-linux.html<\/a><\/p>\n

    Segmentation Fault\u9519\u8bef\u539f\u56e0\u603b\u7ed3
    \n    http:\/\/silencewt.github.io\/2015\/05\/11\/Segmentation-Fault%E9%94%99%E8%AF%AF%E5%8E%9F%E5%9B%A0%E6%80%BB%E7%BB%93\/<\/a><\/p>\n

    segmentation fault
    \n    https:\/\/stackoverflow.com\/questions\/tagged\/segmentation-fault<\/a><\/p>\n

    \u6bb5\u9519\u8bef(Segmentation fault)\u4ea7\u751f\u7684\u539f\u56e0\u4ee5\u53ca\u8c03\u8bd5\u65b9\u6cd5
    \n    http:\/\/www.wtango.com\/%E6%AE%B5%E9%94%99%E8%AF%AFsegmentation-fault%E4%BA%A7%E7%94%9F%E7%9A%84%E5%8E%9F%E5%9B%A0%E4%BB%A5%E5%8F%8A%E8%B0%83%E8%AF%95%E6%96%B9%E6%B3%95\/<\/a><\/p>\n

    Linux \u6bb5\u9519\u8bef\u8be6\u89e3<\/strong><\/span> #\u8d85\u7ea7\u7ed9\u529b
    \n    http:\/\/tinylab.org\/explore-linux-segmentation-fault\/<\/a><\/p>\n

    Segmentation Fault in Linux \u539f\u56e0\u4e0e\u907f\u514d
    \n    http:\/\/www.cnblogs.com\/no7dw\/archive\/2013\/02\/20\/2918372.html<\/a><\/p>\n

    https:\/\/en.wikipedia.org\/wiki\/Segmentation_fault<\/a><\/p>\n

    Linux\u4e0aCore Dump\u6587\u4ef6\u7684\u5f62\u6210\u548c\u5206\u6790<\/strong>
    \n    http:\/\/baidutech.blog.51cto.com\/4114344\/904419<\/a><\/p>\n

    \u6bb5\u9519\u8bef\u8c03\u8bd5\u795e\u5668 – Core Dump\u8be6\u89e3
    \n    http:\/\/www.embeddedlinux.org.cn\/html\/jishuzixun\/201307\/08-2594.html<\/a><\/p>\n

    \u6df1\u5165\u63a2\u7d22Linux coredump\u8c03\u8bd5\u6280\u5de7
    \n    http:\/\/blog.csdn.net\/forever_feng\/article\/details\/4676420<\/a><\/p>\n

    =END=<\/p>\n","protected":false},"excerpt":{"rendered":"

    =Start= \u7f18\u7531\uff1a \u6700\u8fd1\u4e00\u6bb5\u65f6\u95f4\u5728Linux\u4e0b\u7528C\u8bed\u8a00\u505a\u4e00\u4e9b\u5f00\u53d1\u5de5\u4f5c\uff0c\u4f46\u662f\u7531\u4e8e\u5b9e\u9645\u7ecf\u9a8c\u4e0d\u8db3\uff0c\u95ee\u9898\u6bd4\u8f83\u591a\u3002\u5176 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,11,7],"tags":[804,803,806,30,805],"class_list":["post-3332","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-linux","category-programing","tag-core_pattern","tag-coredump","tag-gdb","tag-linux","tag-ulimit"],"views":7604,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3332","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=3332"}],"version-history":[{"count":3,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3332\/revisions"}],"predecessor-version":[{"id":3340,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3332\/revisions\/3340"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=3332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=3332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=3332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}