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Description of problem:
After upgrading to centos 6.7, the function X11() in R (cran) freezes.
X11 draws a window, but nothing inside, the window cannot even be moved, and the only way to recover is killing R.

Version-Release number of selected component (if applicable):
centos 6.7
xorg-x11-server-Xort-1.15.0-36.elg.x86_64 ??

How reproducible:

I have tried with centos official R binary, but also with my own compiled R version, so an R problem should be discarded.

Steps to Reproduce:
1. Upgrade to centos 6.7 from 6.6
2. Execute R binary (from official repo or installed by source)
3. In the R console, type X11()

Actual results:
Window pop-up, but R freezes.

Expected results:


Additional info:

I have found that R is opening the window and waiting for an ExposureEvent, which it never receives causing the window to wait indefinitely and not paint. I believe this is related to the recent 0001-composite-Implement-backing-store-Always.patch in xorg-x11-server.

As a workaround, things work as expected if compositing is disabled in X. It seems only disabling the backing store is not enough.

(In reply to Alex Hartsell from comment #2)
> I have found that R is opening the window and waiting for an ExposureEvent,
> which it never receives causing the window to wait indefinitely and not
> paint. I believe this is related to the recent
> 0001-composite-Implement-backing-store-Always.patch in xorg-x11-server.
> 
> As a workaround, things work as expected if compositing is disabled in X. It
> seems only disabling the backing store is not enough.

Can confirm this bug happening, disabling composite fixed the issue! Thanks Alex!

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-2016-0761.html