{"id":1406,"date":"2018-06-20T11:32:01","date_gmt":"2018-06-20T03:32:01","guid":{"rendered":"https:\/\/damogame.cn:15443\/wordpress\/?p=1406"},"modified":"2018-06-20T11:32:01","modified_gmt":"2018-06-20T03:32:01","slug":"segfault%e5%92%8ccore-dump","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/1406","title":{"rendered":"segfault\u548ccore dump"},"content":{"rendered":"<div class=\"article-title-box\">\n<h1 class=\"title-article\">segfault at xxx rip xxx rsp xxx error 4\uff08\u5408\u5e76\u6574\u7406\uff09<\/h1>\n<\/div>\n<div class=\"article-info-box\">\n<div class=\"article-bar-top d-flex\"><span class=\"time\">2016\u5e7404\u670801\u65e5 09:56:54<\/span><\/p>\n<div class=\"float-right\"><span class=\"read-count\">\u9605\u8bfb\u6570\uff1a8136<\/span><\/div>\n<\/div>\n<\/div>\n<article>\n<div id=\"article_content\" class=\"article_content clearfix csdn-tracking-statistics\" data-pid=\"blog\" data-mod=\"popu_307\" data-dsm=\"post\">\n<div class=\"htmledit_views\">\u901a\u8fc7 sudo cat \/var\/log\/messages |grep segfault \u6216\u8005 sudo dmesg|grep segfault \u83b7\u5f97<br \/>\n\u8fd9\u79cd\u4fe1\u606f\u4e00\u822c\u90fd\u662f\u7531\u5185\u5b58\u8bbf\u95ee\u8d8a\u754c\u9020\u6210\u7684\uff0c\u4e0d\u7ba1\u662f\u7528\u6237\u6001\u7a0b\u5e8f\u8fd8\u662f\u5185\u6838\u6001\u7a0b\u5e8f\u8bbf\u95ee\u8d8a\u754c\u90fd\u4f1a\u51facore, \u5e76\u5728\u7cfb\u7edf\u65e5\u5fd7\u91cc\u9762\u8f93\u51fa\u4e00\u6761\u8fd9\u6837\u7684\u4fe1\u606f\u3002\u8fd9\u6761\u4fe1\u606f\u7684\u524d\u9762\u5206\u522b\u662f\u8bbf\u95ee\u8d8a\u754c\u7684\u7a0b\u5e8f\u540d\uff0c\u8fdb\u7a0bID\u53f7\uff0c\u8bbf\u95ee\u8d8a\u754c\u7684\u5730\u5740\u4ee5\u53ca\u5f53\u65f6\u8fdb\u7a0b\u5806\u6808\u5730\u5740\u7b49\u4fe1\u606f\uff0c\u6bd4\u8f83\u6709\u7528\u7684\u4fe1\u606f\u662f \u6700\u540e\u7684error number. \u5728\u4e0a\u9762\u7684\u4fe1\u606f\u4e2d\uff0cerror number\u662f4 ,\u4e0b\u9762\u8be6\u7ec6\u4ecb\u7ecd\u4e00\u4e0berror number\u7684\u4fe1\u606f\uff1a<br \/>\n\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cerror number\u662f6, \u8f6c\u6210\u4e8c\u8fdb\u5236\u5c31\u662f110, \u5373bit2=1, bit1=1, bit0=0, \u6309\u7167\u4e0a\u9762\u7684\u89e3\u91ca\uff0c\u6211\u4eec\u53ef\u4ee5\u5f97\u51fa\u8fd9\u6761\u4fe1\u606f\u662f\u7531\u4e8e\u7528\u6237\u6001\u7a0b\u5e8f\u8bfb\u64cd\u4f5c\u8bbf\u95ee\u8d8a\u754c\u9020\u6210\u7684\u3002<br \/>\nerror number\u662f\u7531\u4e09\u4e2a\u5b57\u4f4d\u7ec4\u6210\u7684\uff0c\u4ece\u9ad8\u5230\u5e95\u5206\u522b\u4e3abit2 bit1\u548cbit0,\u6240\u4ee5\u5b83\u7684\u53d6\u503c\u8303\u56f4\u662f0~7.<\/p>\n<p>bit2: \u503c\u4e3a1\u8868\u793a\u662f\u7528\u6237\u6001\u7a0b\u5e8f\u5185\u5b58\u8bbf\u95ee\u8d8a\u754c\uff0c\u503c\u4e3a0\u8868\u793a\u662f\u5185\u6838\u6001\u7a0b\u5e8f\u5185\u5b58\u8bbf\u95ee\u8d8a\u754c<br \/>\nbit1: \u503c\u4e3a1\u8868\u793a\u662f\u5199\u64cd\u4f5c\u5bfc\u81f4\u5185\u5b58\u8bbf\u95ee\u8d8a\u754c\uff0c\u503c\u4e3a0\u8868\u793a\u662f\u8bfb\u64cd\u4f5c\u5bfc\u81f4\u5185\u5b58\u8bbf\u95ee\u8d8a\u754c<br \/>\nbit0: \u503c\u4e3a1\u8868\u793a\u6ca1\u6709\u8db3\u591f\u7684\u6743\u9650\u8bbf\u95ee\u975e\u6cd5\u5730\u5740\u7684\u5185\u5bb9\uff0c\u503c\u4e3a0\u8868\u793a\u8bbf\u95ee\u7684\u975e\u6cd5\u5730\u5740\u6839\u672c\u6ca1\u6709\u5bf9\u5e94\u7684\u9875\u9762\uff0c\u4e5f\u5c31\u662f\u65e0\u6548\u5730\u5740<br \/>\n\u5982\uff1a<br \/>\nNov\u00a0 3 09:27:50 ip-172-31-18-210 kernel: [12702742.866113] nginx[53350]: segfault at 1b852e2 ip 00007f9085b3b616 sp 00007ffdf15f1368 error 4 in libc-2.17.so[7f90859ec000+1b7000]<\/p>\n<p>nginx[31752]: segfault at 0 ip 000000000047c0d5 sp 00007fff688cab40 error 4 in nginx[400000+845000]<\/p>\n<p><a href=\"http:\/\/blog.chinaunix.net\/uid-24774106-id-344195.html\" target=\"_blank\" rel=\"noopener\">Linux\u4e0b\u6253\u5f00core\u6587\u4ef6\uff0c\u5b9a\u4f4dsegfault<\/a>\u00a0&#8211;http:\/\/blog.chinaunix.net\/uid-24774106-id-344195.html<\/p>\n<p>\u51fa\u73b0\u6bb5\u9519\u8bef\uff0c\u4e0d\u5bb9\u6613\u5b9a\u4f4d\u5230\u5e95\u662f\u54ea\u884c\u4ee3\u7801\u51fa\u73b0\u4e86\u95ee\u9898\uff0csegfault\u591a\u6b21\u6298\u78e8\u7684\u7b14\u8005\u6b7b\u53bb\u6d3b\u6765\uff0c<\/p>\n<div>\u67e5\u8d44\u6599\u53d1\u73b0\u4e86\u5b9a\u4f4d\u6bb5\u9519\u8bef\u7684\u65b9\u6cd5\u3002<\/div>\n<div><\/div>\n<div>\u00a0 \u00a0 Linux\u4e0b\u6709\u6838\u5fc3\u8f6c\u50a8\u6587\u4ef6\u5373core\u6587\u4ef6\uff0c\u4f1a\u628a\u7a0b\u5e8f\u5d29\u6e83\u662f\u7684\u73b0\u573a\u4fdd\u5b58\u8d77\u6765\u4f9bgdb\u6765\u8c03\u8bd5\u3002<\/div>\n<div>\u6253\u5f00\u7684\u529e\u6cd5\u662f ulimit -c unlimited \u3002<\/div>\n<div>\u00a0 \u00a0 \u8bbe\u7f6e\u4e4b\u524d\u53ef\u4ee5\u8c03\u7528ulimit -c \u67e5\u770b\u5f53\u524d\u7684\u5927\u5c0f\uff0c\u5982\u679c\u662f0\uff0c\u8868\u793a\u4e0d\u751f\u6210core\u6587\u4ef6\u3002unlimited \u7684\u542b\u4e49\u662f\u4e0d\u8bba\u751f\u6210\u7684core\u6587\u4ef6\u6709\u591a\u5927\uff0c\u6211\u90fd\u8ba9\u7cfb\u7edf\u751f\u6210core \u6587\u4ef6\u3002<\/div>\n<div><\/div>\n<div>\u00a0 \u00a0 \u5f53\u65f6\u8fd9\u4e2a\u65b9\u6cd5\u6709\u4e2a\u5f0a\u7aef\u662f\uff0c\u5728\u90a3\u4e2a\u7ec8\u7aef\u4e0a\u8bbe\u7f6e\u7684ulimit\u5c31\u5728\u90a3\u4e2a\u7ec8\u7aef\u4e0a\u751f\u6548\uff0c\u5982\u679c\u4f60\u5728\u53e6\u4e00\u4e2a\u7ec8\u7aef\u4e0a\u6267\u884c\u7a0b\u5e8f\uff0c\u4f60\u4f1a\u53d1\u73b0\uff0c\u7eb5\u7136\u6709\u6bb5\u9519\u8bef\uff0c\u4f60\u4e5f\u6ca1\u751f\u6210core\u6587\u4ef6<\/div>\n<div><\/div>\n<div>\u00a0 \u00a0 \u7b2c\u4e8c\u4e2a\u529e\u6cd5\u662f\u4fee\u6539 \/root\/.bash_profile \u6587\u4ef6\u6dfb\u52a0\u4e00\u884c \u00a0ulimit -S -c \u00a0unlimited \u7136\u540e\u4fdd\u5b58\u5173\u95ed\u6587\u4ef6\u3002<\/div>\n<div><\/div>\n<div>\u00a0 \u00a0 \u00a0\u6709\u5f88\u591alinux\u7cfb\u7edf\/root \u76ee\u5f55\u4e0b\u5e76\u6ca1\u6709.bash_profile \u6587\u4ef6\uff0c\u6bd4\u5982SUSE\uff0c\u8fd9\u6ca1\u6709\u5173\u7cfb\u4f60\u81ea\u5df1vi \u521b\u5efa\u8fd9\u4e2a\u6587\u4ef6\u5373\u53ef\u3002<\/div>\n<div><\/div>\n<div>\u00a0 \u00a0 \u4fee\u6539\u5b8c\u8fd9\u4e2a\u6587\u4ef6\u4e4b\u540e\uff0c\u6267\u884csource\u00a0\/root\/.bash_profile\uff0c\u4f60\u5c31\u53ef\u4ee5\u67e5\u770b\u4f60\u7684\u4fee\u6539\u751f\u6548\u4e86\u6ca1\u6709\u3002<\/div>\n<div><\/div>\n<div>\u00a0 \u00a0 \u67e5\u770b\u65b9\u6cd5\u662f ulimit -c.\u4f60\u4f1a\u53d1\u73b0\uff0c\u7ec8\u7aef\u6253\u5370\u51fa unlimited\uff0c\u8868\u793a\u4f60\u7684\u914d\u7f6e\u751f\u6548\u4e86\uff0c\u4f60\u53ef\u4ee5\u65b0\u5f00\u7ec8\u7aef \u6267\u884c ulimit -c\uff0c\u53d1\u73b0\u65b0\u5f00\u7ec8\u7aef\u4e5f\u662funlimited \u3002<\/div>\n<div><\/div>\n<div><\/div>\n<div>\u597d\uff0c\u6253\u5f00\u5f00\u5173\u4e4b\u540e\uff0c\u4f60\u5c31\u53ef\u4ee5\u8dd1\u4f60\u7684\u6709segfault\u7684\u4ee3\u7801\u4e86\u3002<\/div>\n<div>\u4e00\u822ccore\u6587\u4ef6\u4f1a\u751f\u6210\u5728\u4f60\u7684\u53ef\u6267\u884c\u6587\u4ef6\u6240\u5728\u7684\u76ee\u5f55\u4e0b\u3002\u5f53\u7136\u53ef\u4ee5\u8bbe\u5b9a\u3002<\/div>\n<div>\u8bbe\u5b9a\u7684\u65b9\u6cd5\u662f \u4fee\u6539 \/proc\/sys\/kernel\/core_pattern<\/div>\n<div>\u8fd9\u4e2a\u6587\u4ef6\u4e0d\u652f\u6301vi\u7684\u65b9\u5f0f\u4fee\u6539\uff0c\u53ef\u4ee5\u4f7f\u7528echo<\/div>\n<div>\u5982echo \u201c\/corefile\/core-%p-%e-%t\u201d &gt;\u00a0\/proc\/sys\/kernel\/core_pattern<\/div>\n<div>\u8fd9\u4e2a\u8bed\u53e5\u7684\u542b\u4e49\u662f\u5c06core\u6587\u4ef6\u751f\u6210\u5728 \/corefile\/\u8fd9\u4e2a\u76ee\u5f55\u4e0b<\/div>\n<div>\u751f\u6210\u7684\u6587\u4ef6\u540d\u7684\u683c\u5f0f\u662f\uff1a\u201ccore\u201d-\u201cpid\u201d-\u53ef\u6267\u884c\u7a0b\u5e8f\u540d-\u6bb5\u9519\u8bef\u65f6\u95f4<\/div>\n<div>%p &#8212;&#8212;&#8212;\u6bb5\u9519\u8bef\u8fdb\u7a0b\u7684PID<\/div>\n<div>%e&#8212;&#8212;&#8212;&#8211;\u53d1\u751f\u6bb5\u9519\u8bef\u7684\u53ef\u6267\u884c\u6587\u4ef6\u540d<\/div>\n<div>%t&#8212;&#8212;- \u53d1\u751f\u6bb5\u9519\u8bef\u7684\u65f6\u95f4<\/div>\n<div><\/div>\n<div>\u8fd8\u6709\u5176\u4ed6\u914d\u7f6e\u9009\u9879\u3002<\/div>\n<div>\u751f\u6210\u4e86core\u6587\u4ef6\uff0c\u4f60\u5c31\u53ef\u4ee5\u8c03\u8bd5\u4e86\uff0c\u8c03\u8bd5\u65b9\u6cd5\u662f\uff1a<\/div>\n<div><\/div>\n<div>gdb -c core test<\/div>\n<div>\u6ce8test\u662f\u4f60\u7684\u53ef\u6267\u884c\u6587\u4ef6\u540d\u3002\u4f60\u5c31\u53ef\u4ee5\u60f3\u7528gdb\u8c03\u8bd5\u6587\u4ef6\u4e00\u6837\u8c03\u8bd5\u4f60\u7684core\u6587\u4ef6\u4e86\u3002<\/div>\n<p>&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<\/p>\n<p><strong>Linux\u4e0aCore Dump\u6587\u4ef6\u7684\u5f62\u6210\u548c\u5206\u6790&#8212;http:\/\/baidutech.blog.51cto.com\/4114344\/904419\/<\/strong><\/p>\n<p>Core\uff0c\u53c8\u79f0\u4e4b\u4e3aCore Dump\u6587\u4ef6\uff0c\u662fUnix\/Linux\u64cd\u4f5c\u7cfb\u7edf\u7684\u4e00\u79cd\u673a\u5236\uff0c\u5bf9\u4e8e\u7ebf\u4e0a\u670d\u52a1\u800c\u8a00\uff0cCore\u4ee4\u4eba\u95fb\u4e4b\u8272\u53d8\uff0c\u56e0\u4e3a\u51faCore\u7684\u8fc7\u7a0b\u610f\u5473\u7740\u670d\u52a1\u6682\u65f6\u4e0d\u80fd\u6b63\u5e38\u54cd\u5e94\uff0c\u9700\u8981\u6062\u590d\uff0c\u5e76\u4e14\u968f\u7740\u5410Core\u8fdb\u7a0b\u7684\u5185\u5b58\u7a7a\u95f4\u8d8a\u5927\uff0c\u6b64\u8fc7\u7a0b\u53ef\u80fd\u6301\u7eed\u5f88\u957f\u4e00\u6bb5\u65f6\u95f4\uff08\u4f8b\u5982\u5f53\u8fdb\u7a0b\u5360\u752860G+\u4ee5\u4e0a\u5185\u5b58\u65f6\uff0c\u5b8c\u6574Core\u6587\u4ef6\u9700\u898115\u5206\u949f\u624d\u80fd\u5b8c\u5168\u5199\u5230\u78c1\u76d8\u4e0a\uff09\uff0c\u8fd9\u671f\u95f4\u4ea7\u751f\u7684\u6d41\u91cf\u635f\u5931\uff0c\u4e0d\u53ef\u4f30\u91cf\u3002<\/p>\n<p>\u51e1\u4e8b\u7686\u6709\u4e24\u9762\u6027\uff0cOS\u5728\u51faCore\u7684\u540c\u65f6\uff0c\u867d\u7136\u4f1a\u7ec8\u6b62\u6389\u5f53\u524d\u8fdb\u7a0b\uff0c\u4f46\u662f\u4e5f\u4f1a\u4fdd\u7559\u4e0b\u7b2c\u4e00\u624b\u7684\u73b0\u573a\u6570\u636e\uff0cOS\u4eff\u4f5b\u662f\u4e00\u67b6\u88ab\u6309\u4e0b\u5feb\u95e8\u7684\u76f8\u673a\uff0c\u800c\u7167\u7247\u5c31\u662f\u4ea7\u51fa\u7684Core\u6587\u4ef6\u3002\u91cc\u9762\u542b\u6709\u5f53\u8fdb\u7a0b\u88ab\u7ec8\u6b62\u65f6\u5185\u5b58\u3001CPU\u5bc4\u5b58\u5668\u7b49\u4fe1\u606f\uff0c\u53ef\u4ee5\u4f9b\u540e\u7eed\u5f00\u53d1\u4eba\u5458\u8fdb\u884c\u8c03\u8bd5\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u5173\u4e8eCore\u4ea7\u751f\u7684\u539f\u56e0\u5f88\u591a\uff0c\u6bd4\u5982\u8fc7\u53bb\u4e00\u4e9bUnix\u7684\u7248\u672c\u4e0d\u652f\u6301\u73b0\u4ee3Linux\u4e0a\u8fd9\u79cdGDB\u76f4\u63a5\u9644\u7740\u5230\u8fdb\u7a0b\u4e0a\u8fdb\u884c\u8c03\u8bd5\u7684\u673a\u5236\uff0c\u9700\u8981\u5148\u5411\u8fdb\u7a0b\u53d1\u9001\u7ec8\u6b62\u4fe1\u53f7\uff0c\u7136\u540e\u7528\u5de5\u5177\u9605\u8bfbcore\u6587\u4ef6\u3002\u5728Linux\u4e0a\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u4f7f\u7528kill\u5411\u4e00\u4e2a\u6307\u5b9a\u7684\u8fdb\u7a0b\u53d1\u9001\u4fe1\u53f7\u6216\u8005\u4f7f\u7528gcore\u547d\u4ee4\u6765\u4f7f\u5176\u4e3b\u52a8\u51faCore\u5e76\u9000\u51fa\u3002\u5982\u679c\u4ece\u6d45\u5c42\u6b21\u7684\u539f\u56e0\u4e0a\u6765\u8bb2\uff0c\u51faCore\u610f\u5473\u7740\u5f53\u524d\u8fdb\u7a0b\u5b58\u5728BUG\uff0c\u9700\u8981\u7a0b\u5e8f\u5458\u4fee\u590d\u3002\u4ece\u6df1\u5c42\u6b21\u7684\u539f\u56e0\u4e0a\u8bb2\uff0c\u662f\u5f53\u524d\u8fdb\u7a0b\u89e6\u72af\u4e86\u67d0\u4e9bOS\u5c42\u7ea7\u7684\u4fdd\u62a4\u673a\u5236\uff0c\u903c\u8febOS\u5411\u5f53\u524d\u8fdb\u7a0b\u53d1\u9001\u8bf8\u5982SIGSEGV(\u5373signal 11)\u4e4b\u7c7b\u7684\u4fe1\u53f7, \u4f8b\u5982\u8bbf\u95ee\u7a7a\u6307\u9488\u6216\u6570\u7ec4\u8d8a\u754c\u51faCore\uff0c\u5b9e\u9645\u4e0a\u662f\u89e6\u72af\u4e86OS\u7684\u5185\u5b58\u7ba1\u7406\uff0c\u8bbf\u95ee\u4e86\u975e\u5f53\u524d\u8fdb\u7a0b\u7684\u5185\u5b58\u7a7a\u95f4\uff0cOS\u9700\u8981\u901a\u8fc7\u51faCore\u6765\u8fdb\u884c\u8b66\u793a\uff0c\u8fd9\u5c31\u597d\u50cf\u4e00\u4e2a\u4eba\u8eab\u4f53\u5185\u5b58\u5728\u75c5\u6bd2\uff0c\u514d\u75ab\u7cfb\u7edf\u5c31\u4f1a\u901a\u8fc7\u53d1\u70ed\u6765\u8b66\u793a\uff0c\u5e76\u5bfc\u81f4\u4eba\u4f53\u53d1\u70e7\u662f\u4e00\u4e2a\u9053\u7406\uff08\u6709\u610f\u601d\u7684\u662f\uff0c\u5e76\u4e0d\u662f\u6bcf\u6b21\u6570\u7ec4\u8d8a\u754c\u90fd\u4f1a\u51faCore\uff0c\u8fd9\u548cOS\u7684\u5185\u5b58\u7ba1\u7406\u4e2d\u865a\u62df\u9875\u9762\u5206\u914d\u5927\u5c0f\u548c\u8fb9\u754c\u6709\u5173\uff0c\u5373\u4f7f\u4e0d\u51faCore\uff0c\u4e5f\u5f88\u6709\u53ef\u80fd\u8bfb\u5230\u810f\u6570\u636e\uff0c\u5f15\u8d77\u540e\u7eed\u7a0b\u5e8f\u884c\u4e3a\u7d0a\u4e71\uff0c\u8fd9\u662f\u4e00\u79cd\u5f88\u96be\u8ffd\u67e5\u7684BUG\uff09\u3002<\/p>\n<p>\u8bf4\u4e86\u8fd9\u4e9b\uff0c\u4f3c\u4e4e\u611f\u89c9Core\u5f88\u5f3a\u52bf\uff0c\u8ba9\u4eba\u611f\u89c9\u7f3a\u4e4f\u63a7\u5236\u529b\uff0c\u5176\u5b9e\u4e0d\u7136\u3002\u63a7\u5236Core\u4ea7\u751f\u7684\u884c\u4e3a\u548c\u65b9\u5f0f\uff0c\u6709\u4e24\u4e2a\u9014\u5f84\uff1a<\/p>\n<p>1.\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\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6b64\u6587\u4ef6\u5185\u5bb9\u53ea\u6709\u4e00\u884c\u5185\u5bb9\uff1a\u201ccore\u201d\uff0c\u6b64\u6587\u4ef6\u652f\u6301\u5b9a\u5236\uff0c\u4e00\u822c\u4f7f\u7528%\u914d\u5408\u4e0d\u540c\u7684\u5b57\u7b26\uff0c\u8fd9\u91cc\u7f57\u5217\u51e0\u79cd\uff1a<\/p>\n<pre>%p\u00a0 \u51faCore\u8fdb\u7a0b\u7684PID<\/pre>\n<pre>%u\u00a0 \u51faCore\u8fdb\u7a0b\u7684UID<\/pre>\n<pre>%s\u00a0 \u9020\u6210Core\u7684signal\u53f7<\/pre>\n<pre>%t\u00a0 \u51faCore\u7684\u65f6\u95f4\uff0c\u4ece1970-01-0100:00:00\u5f00\u59cb\u7684\u79d2\u6570<\/pre>\n<pre>%e\u00a0 \u51faCore\u8fdb\u7a0b\u5bf9\u5e94\u7684\u53ef\u6267\u884c\u6587\u4ef6\u540d<\/pre>\n<p>2.Ulimit \u2013C\u547d\u4ee4\uff0c\u6b64\u547d\u4ee4\u53ef\u4ee5\u663e\u793a\u5f53\u524dOS\u5bf9\u4e8eCore\u6587\u4ef6\u5927\u5c0f\u7684\u9650\u5236\uff0c\u5982\u679c\u4e3a0\uff0c\u5219\u8868\u793a\u4e0d\u5141\u8bb8\u4ea7\u751fCore\u6587\u4ef6\u3002\u5982\u679c\u60f3\u8fdb\u884c\u4fee\u6539\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<p>Ulimit \u2013cn<\/p>\n<p>\u5176\u4e2dn\u4e3a\u6570\u5b57\uff0c\u8868\u793a\u5141\u8bb8Core\u6587\u4ef6\u4f53\u79ef\u7684\u6700\u5927\u503c\uff0c\u5355\u4f4d\u4e3aKb\uff0c\u5982\u679c\u60f3\u8bbe\u4e3a\u65e0\u9650\u5927\uff0c\u53ef\u4ee5\u6267\u884c\uff1a<\/p>\n<p>Ulimit -cunlimited<\/p>\n<p>\u4ea7\u751f\u4e86Core\u6587\u4ef6\u4e4b\u540e\uff0c\u5c31\u662f\u5982\u4f55\u67e5\u770bCore\u6587\u4ef6\uff0c\u5e76\u786e\u5b9a\u95ee\u9898\u6240\u5728\uff0c\u8fdb\u884c\u4fee\u590d\u3002\u4e3a\u6b64\uff0c\u6211\u4eec\u4e0d\u59a8\u5148\u6765\u770b\u770bCore\u6587\u4ef6\u7684\u683c\u5f0f\uff0c\u591a\u4e86\u89e3\u4e00\u4e9bCore\u6587\u4ef6\u3002<\/p>\n<p>\u9996\u5148\u53ef\u4ee5\u660e\u786e\u4e00\u70b9\uff0cCore\u6587\u4ef6\u7684\u683c\u5f0fELF\u683c\u5f0f\uff0c\u8fd9\u4e00\u70b9\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528readelf -h\u547d\u4ee4\u6765\u8bc1\u5b9e\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n<p><a href=\"http:\/\/img1.51cto.com\/attachment\/201206\/101757807.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"http:\/\/img1.51cto.com\/attachment\/201206\/101757807.jpg\" alt=\"\" border=\"0\" \/><\/a><\/p>\n<p>\u4ece\u8bfb\u51fa\u6765\u7684ELF\u5934\u4fe1\u606f\u53ef\u4ee5\u770b\u5230\uff0c\u6b64\u6587\u4ef6\u7c7b\u578b\u4e3aCore\u6587\u4ef6\uff0c\u90a3\u4e48readelf\u662f\u5982\u4f55\u5f97\u77e5\u7684\u5462\uff1f\u53ef\u4ee5\u4ece\u4e0b\u9762\u7684\u6570\u636e\u7ed3\u6784\u4e2d\u7aa5\u5f97\u4e00\u4e8c\uff1a<\/p>\n<p><a href=\"http:\/\/img1.51cto.com\/attachment\/201206\/101757378.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"http:\/\/img1.51cto.com\/attachment\/201206\/101757378.jpg\" alt=\"\" border=\"0\" \/><\/a><\/p>\n<p>\u5176\u4e2d\u5f53\u503c\u4e3a4\u7684\u65f6\u5019\uff0c\u8868\u793a\u5f53\u524d\u6587\u4ef6\u4e3aCore\u6587\u4ef6\u3002\u5982\u6b64\uff0c\u6574\u4e2a\u8fc7\u7a0b\u5c31\u5f88\u6e05\u695a\u4e86\u3002<\/p>\n<p>\u4e86\u89e3\u4e86\u8fd9\u4e9b\u4e4b\u540e\uff0c\u6211\u4eec\u6765\u770b\u770b\u5982\u4f55\u9605\u8bfbCore\u6587\u4ef6\uff0c\u5e76\u4ece\u4e2d\u8ffd\u67e5BUG\u3002\u5728Linux\u4e0b\uff0c\u4e00\u822c\u8bfb\u53d6Core\u7684\u547d\u4ee4\u4e3a\uff1a<\/p>\n<p>gdb exec_file core_file<\/p>\n<p>\u4f7f\u7528GDB\uff0c\u5148\u4ece\u53ef\u6267\u884c\u6587\u4ef6\u4e2d\u8bfb\u53d6\u7b26\u53f7\u8868\u4fe1\u606f\uff0c\u7136\u540e\u8bfb\u53d6Core\u6587\u4ef6\u3002\u5982\u679c\u4e0d\u4e0e\u53ef\u6267\u884c\u6587\u4ef6\u6405\u5408\u5728\u4e00\u8d77\u53ef\u4ee5\u5417\uff1f\u7b54\u6848\u662f\u4e0d\u884c\uff0c\u56e0\u4e3aCore\u6587\u4ef6\u4e2d\u6ca1\u6709\u7b26\u53f7\u8868\u4fe1\u606f\uff0c\u65e0\u6cd5\u8fdb\u884c\u8c03\u8bd5\uff0c\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u547d\u4ee4\u6765\u9a8c\u8bc1\uff1a<\/p>\n<p>Objdump \u2013x core_file | tail<\/p>\n<p>\u6211\u4eec\u770b\u5230\u5982\u4e0b\u4e24\u884c\u4fe1\u606f\uff1a<\/p>\n<p>SYMBOL TABLE:<\/p>\n<p>no symbols<\/p>\n<p>\u8868\u660e\u5f53\u524d\u7684ELF\u683c\u5f0f\u6587\u4ef6\u4e2d\u6ca1\u6709\u7b26\u53f7\u8868\u4fe1\u606f\u3002<\/p>\n<p>\u4e3a\u4e86\u89e3\u91ca\u5982\u4f55\u770bCore\u4e2d\u4fe1\u606f\uff0c\u6211\u4eec\u6765\u4e3e\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<\/p>\n<p>#include \u201cstdio.h\u201d<\/p>\n<p>int main(){<\/p>\n<p>int stack_of[100000000];<\/p>\n<p>int b=1;<\/p>\n<p>int* a;<\/p>\n<p>*a=b;<\/p>\n<p>}<\/p>\n<p>\u8fd9\u6bb5\u7a0b\u5e8f\u4f7f\u7528gcc \u2013g a.c \u2013o a\u8fdb\u884c\u7f16\u8bd1\uff0c\u8fd0\u884c\u540e\u76f4\u63a5\u4f1aCore\u6389\uff0c\u4f7f\u7528gdb a core_file\u67e5\u770b\u6808\u4fe1\u606f\uff0c\u53ef\u89c1\u5176Core\u5728\u4e86\u8fd9\u884c\u4ee3\u7801\uff1a<\/p>\n<p>int stack_of[100000000];<\/p>\n<p>\u539f\u56e0\u5f88\u660e\u663e\uff0c\u76f4\u63a5\u5728\u6808\u4e0a\u7533\u8bf7\u5982\u6b64\u5927\u7684\u6570\u7ec4\uff0c\u5bfc\u81f4\u6808\u7a7a\u95f4\u6ea2\u51fa\uff0c\u89e6\u72af\u4e86OS\u5bf9\u4e8e\u6808\u7a7a\u95f4\u5927\u5c0f\u7684\u9650\u5236\uff0c\u6240\u4ee5\u51faCore\uff08\u8fd9\u91cc\u662f\u5426\u51faCore\u8fd8\u548cOS\u5bf9\u6808\u7a7a\u95f4\u7684\u5927\u5c0f\u914d\u7f6e\u6709\u5173\uff0c\u4e00\u822c\u4e3a8M\uff09\u3002\u4f46\u662f\u8fd9\u91cc\u8981\u660e\u786e\u4e00\u70b9\uff0c\u771f\u6b63\u51faCore\u7684\u4ee3\u7801\u4e0d\u662f\u5206\u914d\u6808\u7a7a\u95f4\u7684int stack_of[100000000]\uff0c \u800c\u662f\u540e\u9762\u8fd9\u53e5int b=1, \u4e3a\u4f55\uff1f\u51faCore\u7684\u4e00\u79cd\u539f\u56e0\u662f\u56e0\u4e3a\u5bf9\u5185\u5b58\u7684\u975e\u6cd5\u8bbf\u95ee\uff0c\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\u5206\u914d\u6570\u7ec4stack_of\u65f6\u5e76\u672a\u8bbf\u95ee\u5b83\uff0c\u4f46\u662f\u5728\u5176\u540e\u58f0\u660e\u53d8\u91cf\u5e76\u8d4b\u503c\uff0c\u5c31\u76f8\u5f53\u4e8e\u8fdb\u884c\u4e86\u8d8a\u754c\u8bbf\u95ee\uff0c\u7ee7\u800c\u51faCore\u3002\u4e3a\u4e86\u89e3\u91ca\u5f97\u66f4\u8be6\u7ec6\u4e9b\uff0c\u8ba9\u6211\u4eec\u4f7f\u7528gdb\u6765\u770b\u4e00\u4e0b\u51faCore\u7684\u5730\u65b9\uff0c\u4f7f\u7528\u547d\u4ee4gdb a core_file\u53ef\u89c1\uff1a<\/p>\n<p><a href=\"http:\/\/img1.51cto.com\/attachment\/201206\/101757259.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"http:\/\/img1.51cto.com\/attachment\/201206\/101757259.jpg\" alt=\"\" border=\"0\" \/><\/a><\/p>\n<p>\u53ef\u77e5\u7a0b\u5e8f\u51fa\u73b0\u4e86\u6bb5\u9519\u8bef\u201cSegmentation fault\u201d\uff0c \u4ee3\u7801\u662fint b=1\u8fd9\u53e5\u3002\u6211\u4eec\u6765\u67e5\u770b\u4e00\u4e0b\u5f53\u524d\u7684\u6808\u4fe1\u606f\uff1a<\/p>\n<p><a href=\"http:\/\/img1.51cto.com\/attachment\/201206\/101757792.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"http:\/\/img1.51cto.com\/attachment\/201206\/101757792.jpg\" alt=\"\" border=\"0\" \/><\/a><\/p>\n<p>\u5176\u4e2d\u53ef\u89c1\u6307\u4ee4\u6307\u9488rip\u6307\u5411\u5730\u5740\u4e3a0\u00d7400473, \u6211\u4eec\u6765\u770b\u4e0b\u5f53\u524d\u7684\u6307\u4ee4\u662f\u4ec0\u4e48\uff1a<\/p>\n<p><a href=\"http:\/\/img1.51cto.com\/attachment\/201206\/101811422.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"http:\/\/img1.51cto.com\/attachment\/201206\/101811422.jpg\" alt=\"\" border=\"0\" \/><\/a><\/p>\n<p>\u8fd9\u6761movl\u6307\u4ee4\u8981\u628a\u7acb\u5373\u65701\u9001\u52300xffffffffe8287bfc(%rbp)\u8fd9\u4e2a\u5730\u5740\u53bb\uff0c\u5176\u4e2drbp\u5b58\u50a8\u7684\u662f\u5e27\u6307\u9488\uff0c\u800c0xffffffffe8287bfc\u5f88\u660e\u663e\u662f\u4e00\u4e2a\u8d1f\u6570\uff0c\u7ed3\u679c\u8ba1\u7b97\u4e3a-400000004\u3002\u8fd9\u5c31\u53ef\u4ee5\u89e3\u91ca\u4e86\uff1a\u5176\u4e2d\u6211\u4eec\u7533\u8bf7\u7684int stack_of[100000000]\u5360\u7528400000000\u5b57\u8282\uff0cb\u662fint\u7c7b\u578b\uff0c\u5360\u75284\u4e2a\u5b57\u8282\uff0c\u4e14\u6808\u7a7a\u95f4\u662f\u7531\u9ad8\u5730\u5740\u5411\u4f4e\u5730\u5740\u5ef6\u4f38\uff0c\u90a3\u4e48b\u7684\u6808\u5730\u5740\u5c31\u662f0xffffffffe8287bfc(%rbp)\uff0c\u4e5f\u5c31\u662f$rbp-400000004\u3002\u5f53\u6211\u4eec\u5c1d\u8bd5\u8bbf\u95ee\u6b64\u5730\u5740\u65f6\uff1a<\/p>\n<p><a href=\"http:\/\/img1.51cto.com\/attachment\/201206\/101811583.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"http:\/\/img1.51cto.com\/attachment\/201206\/101811583.jpg\" alt=\"\" border=\"0\" \/><\/a><\/p>\n<p>\u53ef\u4ee5\u770b\u5230\u65e0\u6cd5\u8bbf\u95ee\u6b64\u5185\u5b58\u5730\u5740\uff0c\u8fd9\u662f\u56e0\u4e3a\u5b83\u5df2\u7ecf\u8d85\u8fc7\u4e86OS\u5141\u8bb8\u7684\u8303\u56f4\u3002<\/p>\n<p>\u4e0b\u9762\u6211\u4eec\u628a\u7a0b\u5e8f\u8fdb\u884c\u6539\u8fdb\uff1a<\/p>\n<p>#include \u201cstdio.h\u201d<\/p>\n<p>int main(){<\/p>\n<p>int* stack_of = malloc(sizeof(int)*100000000);<\/p>\n<p>int b=1;<\/p>\n<p>int* a;<\/p>\n<p>*a=b;<\/p>\n<p>}<\/p>\n<p>\u4f7f\u7528gcc \u2013O3 \u2013g a.c \u2013o a\u8fdb\u884c\u7f16\u8bd1,\u8fd0\u884c\u540e\u4f1a\u518d\u6b21Core\u6389\uff0c\u4f7f\u7528gdb\u67e5\u770b\u6808\u4fe1\u606f\uff0c\u8bf7\u89c1\u4e0b\u56fe\uff1a<\/p>\n<p><a href=\"http:\/\/img1.51cto.com\/attachment\/201206\/101811425.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"http:\/\/img1.51cto.com\/attachment\/201206\/101811425.jpg\" alt=\"\" border=\"0\" \/><\/a><\/p>\n<p>\u53ef\u89c1BUG\u51fa\u5728\u7b2c7\u884c\uff0c\u4e5f\u5c31\u662f*a=b\u8fd9\u53e5\uff0c\u8fd9\u65f6\u6211\u4eec\u5c1d\u8bd5\u6253\u5370b\u7684\u503c\uff0c\u5374\u53d1\u73b0\u7b26\u53f7\u8868\u4e2d\u627e\u4e0d\u5230b\u7684\u4fe1\u606f\u3002\u4e3a\u4f55\uff1f\u539f\u56e0\u5728\u4e8egcc\u4f7f\u7528\u4e86-O3\u53c2\u6570\uff0c\u6b64\u53c2\u6570\u53ef\u4ee5\u5bf9\u7a0b\u5e8f\u8fdb\u884c\u4f18\u5316\uff0c\u4e00\u4e2a\u8d1f\u9762\u6548\u5e94\u662f\u4f18\u5316\u8fc7\u7a0b\u4e2d\u4f1a\u820d\u5f03\u90e8\u5206\u5c40\u90e8\u53d8\u91cf\uff0c\u5bfc\u81f4\u8c03\u8bd5\u65f6\u51fa\u73b0\u56f0\u96be\u3002\u5728\u6211\u4eec\u7684\u4ee3\u7801\u4e2d\uff0cb\u58f0\u660e\u65f6\u5373\u8d4b\u503c\uff0c\u968f\u540e\u7528\u4e8e\u4e3a*a\u8d4b\u503c\u3002\u4f18\u5316\u540e\uff0c\u6b64\u53d8\u91cf\u4e0d\u518d\u9700\u8981\uff0c\u76f4\u63a5\u4e3a*a\u8d4b\u503c\u4e3a1\u5373\u53ef\uff0c\u5982\u679c\u6c47\u7f16\u7ea7\u4ee3\u7801\u4e0a\u8bb2\uff0c\u6b64\u4f18\u5316\u53ef\u4ee5\u51cf\u5c11\u4e00\u6761MOV\u8bed\u53e5\uff0c\u8282\u7701\u4e00\u4e2a\u5bc4\u5b58\u5668\u3002<\/p>\n<p>\u6b64\u65f6\u6211\u4eec\u7684\u8c03\u8bd5\u4fe1\u606f\u5df2\u7ecf\u51fa\u73b0\u4e86\u4e00\u4e9b\u626d\u66f2\uff0c\u4e3a\u6b64\u6211\u4eec\u91cd\u65b0\u7f16\u8bd1\u6e90\u7a0b\u5e8f\uff0c\u53bb\u6389-O3\u53c2\u6570\uff08\u8fd9\u5c31\u89e3\u91ca\u4e86\u4e3a\u4f55\u4e00\u4e9b\u5927\u578b\u8f6f\u4ef6\u90fd\u4f1a\u6709debug\u7248\u672c\u5b58\u5728\uff0c\u56e0\u4e3adebug\u662f\u672a\u7ecf\u4f18\u5316\u7684\u7248\u672c\uff0c\u5305\u542b\u4e86\u5b8c\u6574\u7684\u7b26\u53f7\u8868\u4fe1\u606f\uff0c\u6613\u4e8e\u8c03\u8bd5\uff09\uff0c\u5e76\u91cd\u65b0\u8fd0\u884c\uff0c\u5f97\u5230\u65b0\u7684core\u5e76\u67e5\u770b\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n<p><a href=\"http:\/\/img1.51cto.com\/attachment\/201206\/101811442.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"http:\/\/img1.51cto.com\/attachment\/201206\/101811442.jpg\" alt=\"\" border=\"0\" \/><\/a><\/p>\n<p>\u8fd9\u6b21\u5c31\u6bd4\u8f83\u660e\u663e\u4e86\uff0cb\u4e2d\u7684\u503c\u6ca1\u6709\u95ee\u9898\uff0c\u6709\u95ee\u9898\u7684\u662fa\uff0c\u5176\u6307\u5411\u7684\u5730\u5740\u662f\u975e\u6cd5\u533a\u57df\uff0c\u4e5f\u5c31\u662fa\u6ca1\u6709\u5206\u914d\u5185\u5b58\u5bfc\u81f4\u7684Core\u3002\u5f53\u7136\uff0c\u672c\u4f8b\u4e2d\u7684\u95ee\u9898\u5176\u5b9e\u975e\u5e38\u660e\u663e\uff0c\u51e0\u4e4e\u4e00\u773c\u5c31\u80fd\u770b\u51fa\u6765\uff0c\u4f46\u4e0d\u59a8\u788d\u5b83\u6210\u4e3a\u4e00\u4e2a\u4f8b\u5b50\uff0c\u7528\u6765\u89e3\u91ca\u5728\u770bCore\u8fc7\u7a0b\u4e2d\uff0c\u9700\u8981\u6ce8\u610f\u7684\u4e00\u4e9b\u95ee\u9898\u3002<\/p>\n<div><\/div>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>segfault at xxx rip <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[118],"class_list":["post-1406","post","type-post","status-publish","format-standard","hentry","tag-02-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/1406","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=1406"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/1406\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=1406"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=1406"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=1406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}