On Tue, Mar 25, 2014 at 09:45:20AM -0400, Scott Sandler wrote:

> Version of git on the server? git version 1.8.3-rc0

There was significant work done between v1.8.3 and v1.8.4 on handling
races in the ref code. As I said before, I don't think the symptoms you
are describing are anything we have seen, or that could be triggered by
the races we found (which were mostly to do with ref enumeration, not
ref writing). But I would suggest upgrading to a newer version of git as
a precaution.

You mentioned elsewhere turning on the reflog, which I think is a good
idea. If there is a race of this sort, you will see a "hole" in the
reflog, where a ref goes from A->B, then again from A->B' (whereas with
normal writes, it would be B->B').

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