{"id":7013,"date":"2019-01-11T12:28:10","date_gmt":"2019-01-11T04:28:10","guid":{"rendered":"https:\/\/yanjingang.com\/blog\/?p=7013"},"modified":"2024-05-18T17:26:31","modified_gmt":"2024-05-18T09:26:31","slug":"%e4%bd%bf%e7%94%a8gdb%e5%88%86%e6%9e%90coredump%e6%96%87%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/yanjingang.com\/blog\/?p=7013","title":{"rendered":"\u5982\u4f55\u4f7f\u7528gdb\u5206\u6790c++ core"},"content":{"rendered":"

\u4e00\u3001\u6982\u8ff0<\/h1>\n

\u4f7f\u7528c++\u5f00\u53d1\u7a0b\u5e8f\u65f6\uff0c\u7ecf\u5e38\u4f1a\u9047\u5230\u8fd0\u884c\u4e2dcore\u7684\u60c5\u51b5\uff0c\u5982\u679c\u662f\u5076\u53d1\u7684\u5c31\u66f4\u52a0\u96be\u4ee5\u5b9a\u4f4d\uff0c\u672c\u6587\u8bb2\u89e3\u5982\u4f55\u4f7f\u7528gdb\u8fdb\u884ccore\u4f4d\u7f6e\u7684\u5206\u6790\u5b9a\u4f4d\u3002<\/p>\n

\u4e8c\u3001\u6253\u5f00coredump\u6587\u4ef6\u751f\u6210<\/h1>\n
# 1. \u652f\u6301\u4ea7\u751fcoredump\r\n# \u67e5\u770b\u5f53\u524d\u8bbe\u7f6e\r\ncat \/etc\/security\/limits.conf|grep core\r\nulimit -c      # \u5982\u679c\u662funlimited,\u8bf4\u660e\u8bbe\u7f6e\u6210\u529f\r\n# \u8bbe\u7f6e\uff08\u6700\u597d\u52a0\u5230\u4e1a\u52a1\u542f\u52a8\u547d\u4ee4\u91cc\uff09\r\nulimit -c unlimited\r\n\r\n# 2.\u63a7\u5236core\u6587\u4ef6\u4fdd\u5b58\u4f4d\u7f6e\u548c\u6587\u4ef6\u540d\u683c\u5f0f\r\n# \u67e5\u770b\u76ee\u524d\u4f7f\u7528\u7684\u65b9\u5f0f\r\ncat \/proc\/sys\/kernel\/core_pattern\r\n# \u4fee\u6539\u751f\u6210\u4f4d\u7f6e\u548c\u547d\u540d\u89c4\u5219\uff08\u5fc5\u987bbash -c 'echo xxx'\u65b9\u5f0f\uff0c\u4e0d\u80fd\u901a\u8fc7vi\u4fee\u6539\uff09\r\nsudo bash -c 'echo \"\/coredump\/%e_%p_%t.core\" > \/proc\/sys\/kernel\/core_pattern'\r\n# \u547d\u540d\u683c\u5f0f\u53c2\u6570:\r\n%p - insert pid into filename \u6dfb\u52a0pid\r\n%u - insert current uid into filename \u6dfb\u52a0\u5f53\u524duid\r\n%g - insert current gid into filename \u6dfb\u52a0\u5f53\u524dgid\r\n%s - insert signal that caused the coredump into the filename \u6dfb\u52a0\u5bfc\u81f4\u4ea7\u751fcore\u7684\u4fe1\u53f7\r\n%t - insert UNIX time that the coredump occurred into filename \u6dfb\u52a0core\u6587\u4ef6\u751f\u6210\u65f6\u7684unix\u65f6\u95f4\r\n%h - insert hostname where the coredump happened into filename \u6dfb\u52a0\u4e3b\u673a\u540d\r\n%e - insert coredumping executable name into filename \u6dfb\u52a0\u547d\u4ee4\u540d\r\n# qnx\u7cfb\u7edf\u4e0b\u6ca1\u6709\/proc\/sys\/kernel\/core_pattern\u6587\u4ef6\uff0c\u9700\u8981\u7528\u547d\u4ee4\u6307\u5b9a\u4fdd\u5b58\u76ee\u5f55\r\ndumper -d \/coredump\/\r\n\r\n# 3.\u6d4b\u8bd5\u8ba9\u7a0b\u5e8f\u4ea7\u751f\u4e00\u4e2acoredump\r\nkill -6 $pid\r\nkill -11 $pid<\/code><\/pre>\n
\u4e09\u3001\u4f7f\u7528gdb\u5206\u6790core<\/h1>\n
1\u3001\u4f7f\u7528gdb\u5206\u6790coredump\u6587\u4ef6<\/h4>\n
# gdb <program> core\u00a0\r\ngdb .\/bin\/ipc_server   ipc_server.core   # \u5fc5\u987b\u4f7f\u7528\u4e0ecore\u65f6\u4e00\u6837\u7684bin\/lib\u6587\u4ef6\r\n(gdb) set args zmq 6000   # \u6307\u5b9a\u8fd0\u884c\u65f6\u7684\u53c2\u6570\r\n(gdb) bt          # backtrace\u663e\u793a\u5f53\u524d\u8c03\u7528\u5806\u6808\r\n(gdb) q           # \u9000\u51fagdb<\/code><\/pre>\n
2\u3001\u4f7f\u7528gdb\u8c03\u8bd5bin\u6587\u4ef6<\/h4>\n
# gdb <program>\r\ngdb .\/bin\/ipc_server\r\n(gdb) set args zmq 6000   # \u6307\u5b9a\u8fd0\u884c\u65f6\u7684\u53c2\u6570\r\n(gdb) set env USER=yan    # \u8bbe\u7f6e\u73af\u5883\u53d8\u91cf\r\n#(gdb) b main           # \u6dfb\u52a0\u8c03\u8bd5\u65ad\u70b9\uff1amain\u51fd\u6570\u5165\u53e3\r\n#(gdb) b test.cc:1618   # \u6dfb\u52a0\u8c03\u8bd5\u65ad\u70b9\uff1atest.cc\u6587\u4ef6\u7684\u7b2c1618\u884c\r\n#(gdb) b test.cc:func   # \u6dfb\u52a0\u8c03\u8bd5\u65ad\u70b9\uff1atest.cc\u6587\u4ef6\u7684func\u51fd\u6570\u5165\u53e3\r\n#(gdb) info b           # \u663e\u793a\u8bbe\u7f6e\u7684\u6240\u6709\u65ad\u70b9\r\n#(gdb) delete <bid>     # \u5220\u9664\u67d0\u4e2a\u65ad\u70b9\r\n(gdb) r            # run\u8fd0\u884c\u7a0b\u5e8f\uff0c\u76f4\u5230\u9047\u5230\u65ad\u70b9\u3001coredump\u6216\u6b63\u5e38\u7ed3\u675f\r\n#(gdb) n            # \u65ad\u70b9next\u8fd0\u884c\u5230\u4e0b\u4e00\u884c\r\n#(gdb) s            # \u65ad\u70b9step\u5355\u6b65\u6267\u884c\uff0c\u9047\u5230\u51fd\u6570\u4f1a\u8fdb\u5165\r\n(gdb) bt           # backtrace\u663e\u793a\u5f53\u524d\u8c03\u7528\u5806\u6808\r\n(gdb) quit         # \u9000\u51fagdb<\/code><\/pre>\n
\u4e09\u3001\u4f7f\u7528gdb\/strace\u5206\u6790\u8fdb\u7a0b\u6216\u7ebf\u7a0b\u5361\u6b7b<\/h1>\n
1\u3001\u4f7f\u7528gdb\u5b9a\u4f4d\u5047\u6b7b\u8fdb\u7a0b<\/h4>\n
# gdb -p <PID> \u6216 gdb <program> <PID>\r\n# \u627e\u5230\u8fd0\u884c\u4e2d\u7684\u8fdb\u7a0bPID\r\nps aux | grep ipc_server \r\n# \u542f\u52a8gdb\uff0c\u9644\u52a0\u5230PID=xxx\u7684\u8fdb\u7a0b\r\ngdb -p xxxx \u6216 gdb .\/bin\/ipc_server xxxx\r\n# \u67e5\u770b\u8fdb\u7a0b\u4fe1\u606f\r\n(gdb) bt     # \u67e5\u770b\u5f53\u524d\u5806\u6808\u8ddf\u8e2a\uff08\u53ef\u591a\u6b21\u8fd0\u884c\u67e5\u770b\u53d8\u5316\uff0c\u4ee5\u786e\u8ba4\u662f\u5426\u5df2\u5361\u6b7b\u5728\u67d0\u4e2a\u4f4d\u7f6e\uff09\r\n(gdb) info threads         # \u663e\u793a\u6240\u6709\u7ebf\u7a0b\u8fd0\u884c\u60c5\u51b5\r\n(gdb) thread apply all bt  # \u663e\u793a\u6240\u6709\u7ebf\u7a0b\u7684\u5806\u6808\u8ddf\u8e2a\uff08\u53ef\u591a\u6b21\u8fd0\u884c\u67e5\u770b\u53d8\u5316\uff0c\u4ee5\u786e\u8ba4\u662f\u5426\u6b7b\u9501\u5047\u6b7b\u7b49\uff09\r\n# \u5b8c\u6210\u540e\u5206\u79bb\u548c\u9000\u51fa\r\n(gdb) detach\r\n(gdb) quit<\/code><\/pre>\n
2\u3001\u4f7f\u7528strace\u5b9a\u4f4d\u8fdb\u7a0b\u7684\u7ebf\u7a0b\u5361\u6b7b\u72b6\u6001<\/h4>\n
strace -T -tt -f -p <PID> -o strace.log  # \u4ecelog\u4e2d\u67e5\u770b\u7ebf\u7a0bID\u7684\u72b6\u6001\r\n  xxxx 20:44:50.328393 futex(0xaaaaede91058, FUTEX_WAIT_PRIVATE<\/span>, 0, NULL <unfinished ...><\/code><\/pre>\n
 <\/p>\n
\u53c2\u8003\uff1a<\/p>\n
linux\u4e0bcoredump\u751f\u6210\u914d\u7f6e<\/a><\/p>\n
GDB\u4f7f\u7528\u8be6\u89e3<\/a><\/p>\n
\u3010\u8c03\u8bd5\u3011Linux\u67e5\u770b\u7a0b\u5e8f\u5361\u6b7b\u4f4d\u7f6e|GDB|\u5206\u6790\u8fdb\u7a0b\u8c03\u7528pstack\u548cstarce|\u5206\u6790\u8017\u65f6\u51fd\u6570<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e00\u3001\u6982\u8ff0 \u4f7f\u7528c++\u5f00\u53d1\u7a0b\u5e8f\u65f6\uff0c\u7ecf\u5e38\u4f1a\u9047\u5230\u8fd0\u884c\u4e2dcore\u7684\u60c5\u51b5\uff0c\u5982\u679c\u662f\u5076\u53d1\u7684\u5c31\u66f4\u52a0\u96be\u4ee5\u5b9a\u4f4d\uff0c\u672c\u6587\u8bb2\u89e3\u5982\u4f55\u4f7f\u7528g […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1027],"tags":[877,1248,1249],"_links":{"self":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/7013"}],"collection":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7013"}],"version-history":[{"count":4,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/7013\/revisions"}],"predecessor-version":[{"id":8554,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/7013\/revisions\/8554"}],"wp:attachment":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7013"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7013"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7013"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}