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
\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
\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
\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
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
%p \u51faCore\u8fdb\u7a0b\u7684PID<\/p>\n
%u \u51faCore\u8fdb\u7a0b\u7684UID<\/p>\n
%s \u9020\u6210Core\u7684signal\u53f7<\/p>\n
%t \u51faCore\u7684\u65f6\u95f4\uff0c\u4ece1970-01-0100:00:00\u5f00\u59cb\u7684\u79d2\u6570<\/p>\n
%e \u51faCore\u8fdb\u7a0b\u5bf9\u5e94\u7684\u53ef\u6267\u884c\u6587\u4ef6\u540d<\/p>\n
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
Ulimit \u2013cn<\/p>\n
\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
Ulimit -cunlimited<\/p>\n
\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
\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
\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
\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
\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
gdb exec_file core_file<\/p>\n
\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
Objdump \u2013x core_file | tail<\/p>\n
\u6211\u4eec\u770b\u5230\u5982\u4e0b\u4e24\u884c\u4fe1\u606f\uff1a<\/p>\n
SYMBOL TABLE:<\/p>\n
no symbols<\/p>\n
\u8868\u660e\u5f53\u524d\u7684ELF\u683c\u5f0f\u6587\u4ef6\u4e2d\u6ca1\u6709\u7b26\u53f7\u8868\u4fe1\u606f\u3002<\/p>\n
\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
#include \u201cstdio.h\u201d<\/p>\n
int main(){<\/p>\n
int stack_of[100000000];<\/p>\n
int b=1;<\/p>\n
int* a;<\/p>\n
*a=b;<\/p>\n
}<\/p>\n
\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
int stack_of[100000000];<\/p>\n
\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
\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
\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
\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
\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
\u4e0b\u9762\u6211\u4eec\u628a\u7a0b\u5e8f\u8fdb\u884c\u6539\u8fdb\uff1a<\/p>\n
#include \u201cstdio.h\u201d<\/p>\n
int main(){<\/p>\n
int* stack_of = malloc(sizeof(int)*100000000);<\/p>\n
int b=1;<\/p>\n
int* a;<\/p>\n
*a=b;<\/p>\n
}<\/p>\n
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Core\uff0c\u53c8\u79f0\u4e4b\u4e3aCore Dump\u6587\u4ef6\uff0c\u662fUnix\/Linux\u64cd\u4f5c\u7cfb\u7edf\u7684\u4e00\u79cd\u673a … \u7ee7\u7eed\u9605\u8bfb