nginx下使用asan和valgrind两个静态检查工具
nginx下使用asan和valgrind两个静态检查工具
1、valgrind
valgrind安装：参考：https://blog.csdn.net/justheretobe/article/details/52986461
wegit：http://valgrind.org/downloads/valgrind-3.12.0.tar.bz2
tar -jxvf valgrind-3.12.0.tar.bz2
cd valgrind-3.12.0
./configure
make
sudo make install
输入valgrind–h显示valgrind的参数及提示，说明安装成功
luajit问题：参考https://groups.google.com/forum/#!topic/openresty/riEO_YXTwz4
sudo valgrind --tool=memcheck --leak-check=full /usr/local/nginx-1.4.2/sbin/nginx
==41400== Memcheck, a memory error detector
==41400== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==41400== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info
==41400== Command: /usr/local/nginx-1.4.2/sbin/nginx
==41400==
==41400== Warning: set address range perms: large range [0x957a040, 0x2e45f7e2) (undefined)
==41400== Warning: set address range perms: large range [0x957b040, 0x2e45f040) (defined)
nginx: [error] failed to initialize Lua VM in /usr/local/nginx-1.4.2/conf/nginx.conf:125
==41400==
==41400== HEAP SUMMARY:
==41400== in use at exit: 619,703,912 bytes in 3,285 blocks
==41400== total heap usage: 20,476 allocs, 17,191 frees, 626,783,730 bytes allocated
==41400==
==41400== 128 bytes in 1 blocks are possibly lost in loss record 583 of 650
==41400== at 0x4C2ABA0: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==41400== by 0x431D0A: ngx_alloc (ngx_alloc.c:22)
==41400== by 0x4222CE: ngx_crc32_table_init (ngx_crc32.c:117)
==41400== by 0x41A20B: main (nginx.c:320)
==41400==
==41400== 1,024 bytes in 1 blocks are definitely lost in loss record 626 of 650
==41400== at 0x4C2D136: memalign (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==41400== by 0x4C2D251: posix_memalign (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==41400== by 0x431DBB: ngx_memalign (ngx_alloc.c:57)
==41400== by 0x41B5C2: ngx_create_pool (ngx_palloc.c:21)
==41400== by 0x419F52: main (nginx.c:299)
==41400==
==41400== LEAK SUMMARY:
==41400== definitely lost: 1,024 bytes in 1 blocks
==41400== indirectly lost: 0 bytes in 0 blocks
==41400== possibly lost: 128 bytes in 1 blocks
==41400== still reachable: 619,702,760 bytes in 3,283 blocks
==41400== suppressed: 0 bytes in 0 blocks
==41400== Reachable blocks (those to which a pointer was found) are not shown.
==41400== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==41400==
==41400== For counts of detected and suppressed errors, rerun with: -v
==41400== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)解决的办法是使用 openresty 的 luajit 仓库的 v2.1-agentzh 分支重新： https://github.com/openresty/luajit2/tree/v2.1-agentzh ，然后，重新编译一个特殊版本的 LuaJIT，强制它使用系统的分配器，即在编译 LuaJIT 时使用类似下面的命令： make CCDEBUG=-g Q= XCFLAGS='-DLUAJIT_USE_VALGRIND -DLUAJIT_USE_SYSMALLOC'
编译脚本做下面的修改：
export LUAJIT_INC=/usr/local/include/luajit-2.1
启动方式
sudo valgrind --tool=memcheck ./sbin/nginx -p . -c conf/配置文件.conf
2、asan
（1）适配代码：
编译脚本中添加：
--fsanitize=address -fno-omit-frame-pointer -static-libasan --with-ld-opt="-fsanitize=address -static-libasan"
makefile中添加 ：-fsanitize=address -fno-omit-frame-pointer -static-libasan
nginx本身需要适配一些文件，不然，会误认为是内存泄漏。
修改下面的文件：
modified: libs/libwtf/GNUmakefile modified: libs/protobuf/Makefile modified: src/core/nginx.h modified: src/core/ngx_array.c modified: src/core/ngx_array.h modified: src/core/ngx_palloc.c modified: src/core/ngx_palloc.h
(2)安装clang
(3)编译新版本运行起来，然后查看日志
默认情况下，asan遇到内存问题，就会终止当前进程的执行，并在spanner的日志文件error.log中打印相关的问题，以及问题的调用栈信息。
线上生成的调用栈只有函数地址，没有符号信息，可以将生成的调用栈弄下来，