Re: [Xen-devel] [PATCH qemu-traditional] qemu: Fix race condition when binding ports

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 09/12/13 13:17, George Dunlap wrote:
> On 12/09/2013 01:10 PM, Andrew Cooper wrote:
>> Two Qemus can race to bind the same VNC port.  It is valid for multiple
>> listen()s on the same socket to succeed, but only the first bind() will
>> succeed.
>>
>> In the case that two Qemus are racing, the second one will fail with an
>> EADDRINUSE, and bail with a fatal error which renders the domain
>> functionally
>> useless.
>>
>> In the case that bind() fails with EADDRINUSE, rebind the socket
>> again and try
>> for the next port.
>
> Sorry if I'm being a bit dense here, but it looks like you have those
> mixed up: if listen() fails with EADDRINUSE, you're going back to call
> bind() again; which would suggest that you can have multible bind()s
> but only a single listen()?  Or am I confused?

Nope - very definitely me who messed up the message.  v2 on its way.

~Andrew

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