[Mono-dev] Random mono apache errors

[Rafael Teixeira]

>From sources (
https://github.com/mono/mono/blob/master/mcs/class/System.Web.Services/System.Web.Services.Protocols/SoapDocumentationHandler.cs
):

			if (key == "wsdl" || key == "schema" || key == "code" || key == "disco")
				return;

#if NET_2_0
			string help = WebServicesSection.Current.WsdlHelpGenerator.Href;
			string path = Path.GetDirectoryName
(ConfigurationManager.OpenMachineConfiguration().FilePath);
#else
			string help = WSConfig.Instance.WsdlHelpPage;
			string path = Path.GetDirectoryName (WSConfig.Instance.ConfigFilePath);
#endif
			*...*

			string physPath = Path.Combine (path, help);


So probably WebServicesSection.Current.WsdlHelpGenerator.Href is returning
null or ConfigurationManager.OpenMachineConfiguration().FilePath is
returning null.

For the first case, as this is read from current configuration which can be
reread from time to time as any part of the configuration chain changes it
is possible that either some of those MonoTodos in
https://github.com/mono/mono/blob/master/mcs/class/System.Web.Services/System.Web.Services.Configuration/WsdlHelpGeneratorElement.cs?source=cc
are
making things flaky:

                [MonoTODO ("probably verifies the Href property here,
after deserializing?")]

		protected override void DeserializeElement (XmlReader reader, bool
serializeCollectionKey)
		{
			base.DeserializeElement (reader, serializeCollectionKey);
		}

		[MonoTODO]
		protected override void Reset (ConfigurationElement parentElement)
		{
			base.Reset (parentElement);
		}


or some locking is missing to avoid reading an incomplete current
configuration instance...

As for the second case after much navigating through sources it comes down
to calling an internal call 'string get_machine_config_path ()' which I
don't have time now to try to explore...

Hope it helps,

Rafael Teixeira
O..:.)oooo


On Wed, Aug 21, 2013 at 8:05 AM, Vladimir Dimitrov
<vlad.dimitrov at gmail.com>wrote:

> Hey guys,
>
> I have worked with mono for almost 7 years but I recently got involved in
> a project that used mono web services and apache together on Linux.
>
> The problem is that as the load on the service started to rise we started
> getting different errors which appear in random intervals.
>
> One of the errors is described here: https://bugzilla.novell.com/**
> show_bug.cgi?id=522631<https://bugzilla.novell.com/show_bug.cgi?id=522631>(not by me). And attempting to fix it I added some configuration that
> caused another error to appear once: http://img577.imageshack.us/**
> img577/4473/44in.png <http://img577.imageshack.us/img577/4473/44in.png>
>
> The only common spot between the errors seem to be the configuration.
> Looks like at some point it becomes invalid. This sometimes happens after
> the service gets restarted, but sometimes it happens while the service is
> running normally. A restart of apache usually fixes the problem.
>
> Does anybody else encountered something similar or have an idea what can
> be the problem?
>
> Thanks,
>  Vladimir
>
>
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