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@simonmichal - we applied the patch from #483 and Xrootd client crashes become significantly more frequent.

It actually appears to be related to this invalid memory handling:

https://github.com/cms-sw/cmssw/issues/14952#issuecomment-243616732

and seems to usually be prefixed by the following:

```
[2016-08-30 16:52:52.468355 -0400][Error  ][XRootDTransport   ] Message 0xf0270d30, stream [1, 0] is a response that we're no longer interested in (timed out)
```

I.e., it seems that the same message is getting processed twice - the first time it is processed, it is deleted.  The second time, it segfaults the application.

This is becoming a blocker for our physics release for the year, so help would be appreciated.

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