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<p style="margin: 10px 0 0 0">I don't think I'm seing any obvious problem with the code except possibly in a case where the type="Discovery" Handler is declared down in the ApplicationOverride (meaning there are separate Handler elements at that level) but the MetadataProvider is global.</p>
<p style="margin: 10px 0 0 0">I think in that scenario there may be a conflict because the locking is done at the handler level, but the feed file names are going to collide.</p>
<p style="margin: 10px 0 0 0">But I can't see an obvious issue if there's just a Handler declared at the top level. That would mean only one actual object gets created, and the Mutex inside that one object should span all uses of the handler, no matter which application a request has been routed into. The code doesn't really make any obvious use of application except to get the metadata to feed, and that's where the problem would come in if there were two Handler objects but one MetadataProvider.</p>
<p style="margin: 10px 0 0 0">That doesn't fit your sample above, the ApplicationOverrides there are pretty sparse. The <SSO> element doesn't generate any of the special Handlers, just the SAML bits, so that shouldn't end up creating separate Handler objects for discovery.</p>
<p style="margin: 10px 0 0 0">Now, I'm just eyeballing, since actually testing this will be significant time to catch a race condition, but I'm pretty good at that.</p>
<p style="margin: 10px 0 0 0">So, not definitive, but if your config is as above, I'm leaning toward believing maybe the event MPM is involved in some way I didn't account for. I think there's a bug, essentially, but the one I found isn't the one I think you're hitting. It's pretty unusual to have more than one DIscovery handler needed, so that won't be a common issue, though I'll fix it of course.</p>
<p style="margin: 10px 0 0 0">Off hand, I don't see what the event MPM could be doing to break this, but is there any way to run briefly with worker and see if the bug recurs? It sounds like it's happening often enough to tell.</p>
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