Xserver-1.18.0 segfault with NVIDIA-Linux-x86_64-355.11 on fedora-23 x86_64

[ 171.172] (EE) Backtrace:
[ 171.428] (EE) 0: /usr/libexec/Xorg (OsLookupColor+0x139) [0x59add9]
[ 171.546] (EE) 1: /lib64/libc.so.6 (__restore_rt+0x0) [0x7f550b367b1f]
[ 171.555] (EE) 2: /lib64/libnvidia-glcore.so.355.11 (nvidiaAddDrawableHandler+0x59b24c) [0x7f5506416c78]
[ 171.555] (EE)
[ 171.555] (EE) Segmentation fault at address 0xe012000f8
[ 171.555] (EE)
Fatal server error:
[ 171.555] (EE) Caught signal 11 (Segmentation fault). Server aborting

KDE 5.15.0-1.fc23

lspci | grep VGA
01:00.0 VGA compatible controller: NVIDIA Corporation GF114M [GeForce GTX 670M] (rev a1)

uname -a
Linux qosmio 4.3.0-0.rc5.git1.2.fc24.x86_64 #1 SMP Wed Oct 14 17:44:25 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
NVIDIA-Linux-x86_64-355.11 nouveau driver crashed too

bugzilla https://bugzilla.redhat.com/show_bug.cgi?id=1254790

1.18 is the development version of Xorg with an unstable ABI. NVIDIA driver releases never support development versions of Xorg or the Linux kernel. You can patch the open source parts of the driver to support newer kernels, but you can’t patch the Xorg support afaik. Downgrade to the latest stable release of Xorg 1.17.

See: http://us.download.nvidia.com/XFree86/Linux-x86_64/355.11/README/minimumrequirements.html

Redhat contributes to xorg-server development so they have a habit of pushing release candidates to decrease backported patches.
I can see nvidia people as well in the xorg-server git logs so I am sure an updated nvidia driver will eventually support xorg 1.18