This looks like my fault: Commit a344d5e (a fix for #1898) adds a change of ref count (probably 0 to 1, and then back to 0) of an XrdXrootdFile object, but after Serialize() has already been called on it. (It is called at line 541, XrdXrootdProtocol::do_Close()). I missed that Serialize() leaves the syncWait member of the XrdXrootdFile object set to the address of an XrdSysSemaphore which is instantiated on the stack in Serialize(). Later Ref(-1) calls Post on this pointer, which no longer points to a valid XrdSysSemaphore object.

I'll aim to make a PR to fix this tomorrow, unless somebody else wants to do so.

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