最后的大作业错误提示:段错误(核心已转存)

[liuouyang569]

ubuntu@VM-16-17-ubuntu:~/code/yolanda-master/build/bin$ ./http_server01
[msg] set epoll as dispatcher, main thread
[msg] add channel fd == 5, main thread
[msg] set epoll as dispatcher, Thread-1
[msg] add channel fd == 9, Thread-1
[msg] event loop thread init and signal, Thread-1
[msg] event loop run, Thread-1
[msg] event loop thread started, Thread-1
[msg] set epoll as dispatcher, Thread-2
[msg] add channel fd == 12, Thread-2
[msg] event loop thread init and signal, Thread-2
[msg] event loop run, Thread-2
[msg] event loop thread started, Thread-2
[msg] add channel fd == 6, main thread
[msg] event loop run, main thread
[msg] epoll_wait wakeup, main thread
[msg] get message channel fd==6 for read, main thread
[msg] activate channel fd == 6, revents=2, main thread
[msg] new connection established, socket == 13
[msg] connection completed
[msg] epoll_wait wakeup, Thread-1
[msg] get message channel fd==9 for read, Thread-1
[msg] activate channel fd == 9, revents=2, Thread-1
[msg] wakeup, Thread-1
[msg] add channel fd == 13, Thread-1
[msg] epoll_wait wakeup, main thread
[msg] get message channel fd==6 for read, main thread
[msg] activate channel fd == 6, revents=2, main thread
[msg] new connection established, socket == 14
[msg] connection completed
[msg] epoll_wait wakeup, Thread-2
[msg] get message channel fd==12 for read, Thread-2
[msg] activate channel fd == 12, revents=2, Thread-2
[msg] wakeup, Thread-2
[msg] add channel fd == 14, Thread-2
[msg] epoll_wait wakeup, Thread-1
[msg] get message channel fd==13 for read, Thread-1
[msg] activate channel fd == 13, revents=2, Thread-1
[msg] get message from tcp connection connection-13
Segmentation fault (core dumped)

后面通过print定位到这句话出错:

[liuouyang569]

有同学遇到相同问题吗，在那句 strncpy(httpRequest->method, start, space - start); 这句话出错了，网上说是一般是内存地址超了，但是感觉逻辑没有错误，希望老师可以指正一下。

[froghui]

你的test数据是什么？测试环境是什么? 我先试着重现一下

[liuouyang569]

老师您好，非常高兴得到您的回复。我在Ubuntu18.04和Ubuntu20.04系统上都编译了代码。编译代码和启动服务均正常，当在浏览器中中输入127.0.01:43211/ 这条url后发生这个错误提醒，这个好像是内存访问的问题。

[liuouyang569]

老师您好，我用的就是您公布的开源代码，不知道您那里现在运行情况如何。

[froghui]

我的环境 16.04.6 LTS (GNU/Linux 4.4.0-184-generic x86_64)，跑起来正常的。你可以试着debug下。

[liuouyang569]

老师您好，经过您的提醒，我刚刚才Ubuntu16.04上重新测试了程序，发现不会出现该错误，没想到系统环境对程序有很大的影响啊。。。，还需努力，谢谢您的指正。

[Forest-Darkness]

您好，我在Ubuntu20.04上运行也遇到同样的问题，想请教一下您知道为什么在Ubuntu18.04和20.04上运行会报错吗

[liuouyang569]

不知道，段错误是c++里比较难找的错误，应该是内存方面的问题。

[Forest-Darkness]

不知道，段错误是c++里比较难找的错误，应该是内存方面的问题。
好的，谢谢您。

[xxrlzzz]

不知道，段错误是c++里比较难找的错误，应该是内存方面的问题。
好的，谢谢您。

debug编译然后gdb挂上去看一下就知道了

[Anoning]

我也在Ubuntu20.04上遇到段错误，老师和兄弟们是怎么解决的？

[Fischer0522]

段错误的话把涉及到memmem函数的部分全部加上头文件string.h和 #define _GNU_SOURCE就可以了，分别有lib/http_server.c lib/buffer.c chap34/http_server01.c 在wsl ubantu20.04上面有效