使用“尝试"；避免分段错误 [英] using "try" to avoiding a segmentation fault

问题描述

最近在我的一个程序中，我遇到了分段错误问题.我设法找到了导致问题的线路，但我还没有找到解决方法.

Recently in one of my programs I got a segmentation fault problem. I managed to find the line that its is causing the problem but I haven't find the way of fixing it.

行:

self.window_player.add(self.vlc)

其中 self.vlc 是一个小部件，self.window_player 是一个空的 Gtk.Window() 在 glade 中创建.

where self.vlc is a widget and self.window_player is an empty Gtk.Window() created in glade.

该行在我的程序的 __init__ 处，所以实际上这个问题只在启动程序时发生.奇怪的事实是，错误只出现了 10 次中的 1 次(启动程序)

The line is at the __init__ of my program, so actually this problem only happen when launching the program. The weird fact is that the error only appears like 1 of 10 times (of launching the program)

错误:Segmentation fault 是我从终端得到的唯一输出

the error: Segmentation fault is the only output that I get from the terminal

所以我尝试了:

while True:
    try:
        self.window_player.add(self.vlc)
        break
    except:
        print "segmentation"

问题是try似乎没有排除分段错误！

The problem is that the segmentation fault don't seems to be excepted by the try!

推荐答案

对不起，你处理不了.段错误是由内存损坏、超出自有内存边界的读取或写入、双重释放和其他一些原因引起的.

Sorry, you can't handle it. A segfault is caused by memory corruption, reading or writing beyond boundaries of owned memory, double frees, and a few other.

您可以在此处找到一些导致段错误的问题示例:

You can found a few examples of issues that cause a segfault here:

https://gist.github.com/carlos-jenkins/8873932

操作系统会杀死有问题的程序，你无能为力.您唯一的解决方案是纠正根本问题.

The operating system will kill the offending program, you can't do much about it. Your only solution is to correct the root problem.

您可以使用 Valgrind 工具运行程序，它可以让您准确找到问题所在:

You can run a program using the tool Valgrind, it will allow you to find exactly where the problem is:

http://valgrind.org/

在 Ubuntu 上，只需 sudo apt-get install valgrind 然后 valgrind <program cmd> 将启动程序.这种偏离会慢很多，但大多数时候会发现问题.

On Ubuntu, just sudo apt-get install valgrind and then valgrind <program cmd> will launch the program. This offcourse will be a lot slower, but will identify the problem most of the time.

旁注:从技术上讲，您可以通过为该信号注册回调来捕获 SIGSEV 信号.但你不应该.有关更多信息，请参阅此答案:

Side note: Technically you can catch a SIGSEV signal by registering a callback for this signal. But you shouldn't. See this answer for more information:

https://stackoverflow.com/a/10203062/439494

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