[Intel-gfx] intel_drv.so segfault

[Grant]

I'm getting the following segfault intermittently when using sna.
I've tried xf86-video-intel-2.99.905 and the latest from git a week or
so ago.

[ 12021.732] (EE) Backtrace:
[ 12021.741] (EE) 0: /usr/bin/X (xorg_backtrace+0x36) [0x589746]
[ 12021.741] (EE) 1: /usr/bin/X (0x400000+0x18d3d9) [0x58d3d9]
[ 12021.741] (EE) 2: /lib64/libpthread.so.0 (0x7f5c707c5000+0x10460)
[0x7f5c707d5460]
[ 12021.741] (EE) 3: /usr/lib64/xorg/modules/drivers/intel_drv.so
(0x7f5c6e3ca000+0x2fe79) [0x7f5c6e3f9e79]
[ 12021.741] (EE) 4: /usr/lib64/xorg/modules/drivers/intel_drv.so
(0x7f5c6e3ca000+0x3037f) [0x7f5c6e3fa37f]
[ 12021.741] (EE) 5: /usr/bin/X (0x400000+0x3713b) [0x43713b]
[ 12021.741] (EE) 6: /usr/bin/X (0x400000+0x3b176) [0x43b176]
[ 12021.741] (EE) 7: /usr/bin/X (0x400000+0x29c4a) [0x429c4a]
[ 12021.741] (EE) 8: /lib64/libc.so.6 (__libc_start_main+0xfd) [0x7f5c6f44a4bd]
[ 12021.741] (EE) 9: /usr/bin/X (0x400000+0x29f91) [0x429f91]
[ 12021.741] (EE)
[ 12021.741] (EE) Segmentation fault at address 0x0

- Grant