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From Patricia Shanahan <p...@acm.org>
Subject Re: Build crashes (Was: Re: Request for testing help)
Date Sat, 25 Sep 2010 09:28:27 GMT
On 9/25/2010 2:23 AM, Sim IJskes - QCG wrote:
> On 09/25/2010 11:05 AM, Patricia Shanahan wrote:
>> I needed to do a general reset before starting a new set of tests. I
>> completely shut down (virtual power off) all my VMs and restarted the
>> system. This happened during the first build I did after restarting the
>> VM in question. Before the build, I had run gedit but no tests. If it is
>> a testing framework problem, it has to be in the junit testing that is
>> done during the build.
>
> The operating system is not without state, so a test might be influenced
> by the state changes in the OS from the previous test.
>
> For instance when a server socket is opened, and closed, you cannot
> immediately bind on that same server socket, unless you specify
> SO_REUSEADDR with setsockopt(). This is because after closing the socket
> stays in TIME_WAIT2 state for some time.

Across a reboot? I did a complete shut down of the VM, and restart of 
the hosting WindowsXP, between the last test and this build failure.

I have had problems in the past in which killing a test left a socket 
tied up, but rebooting has always cleared it.

>
> So if you forget to specify SO_REUSEADDR on your server sockets, and run
> the same test in rapid succession, it might fail.
>
> I did a small codereview on the TcpServerEndpoint, and no mention of the
> ServerSocket.setReuseAddress() call, so that is a potential cause.
>
> Gr. Sim
>
>
>
>


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