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I think this is https://bugzilla.gnome.org/show_bug.cgi?id=731562 , I will try to backport that change.

Created attachment 945364 [details]
backported eds patch

This is the backported upstream patch for evolution-data-server. It's not 1:1 with its upstream version, some parts were not applicable, but the main part with locking access to selected folder variables is included.

As indicated by [1], that still can happen and more core IMAPx code changes are required to truly fix this, for which the [2] is filled.

[1] https://bugzilla.gnome.org/show_bug.cgi?id=737468
[2] https://bugzilla.gnome.org/show_bug.cgi?id=745545

The change from comment #3, respectively comment #2, is included in the rebased evolution-data-server 3.12.11. It's still not enough, as mentioned in comment #4.

I'll commit the temporary workaround from the upstream bug report [1], which is only a workaround, thus this error can still happen, as wrote in that bug, but less often. I cannot do more about this right now, even with the rewrite of the job queue, which I expect to be too aggressive, thus not much suitable for the RHEL as of now.

[1] https://bugzilla.gnome.org/show_bug.cgi?id=737468

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2226.html