Sometimes after suspend/resume Xorg server crashes on current+drm-devel. 

[ 45334.188] (II) LoadModule: "fb"
[ 45334.188] (II) Loading /usr/local/lib/xorg/modules/libfb.so
[ 45334.188] (II) Module fb: vendor="X.Org Foundation"
[ 45334.188]    compiled for 1.20.9, module version = 1.0.0
[ 45334.188]    ABI class: X.Org ANSI C Emulation, version 0.4
[ 45334.189] (EE) 
[ 45334.189] (EE) Backtrace:
[ 45334.190] (EE) 0: /usr/local/bin/Xorg (?+0x0) [0x41dc30]
[ 45334.191] (EE) unw_get_proc_name failed: no unwind info found [-10]
[ 45334.191] (EE) 1: /lib/libthr.so.3 (?+0x0) [0x800921b00]
[ 45334.191] (EE) unw_get_proc_name failed: no unwind info found [-10]
[ 45334.191] (EE) 2: /lib/libthr.so.3 (?+0x0) [0x800921060]
[ 45334.192] (EE) 3: ? (?+0x0) [0x7ffffffff003]
[ 45334.193] (EE) unw_get_proc_name failed: no unwind info found [-10]
[ 45334.193] (EE) 4: /lib/libc.so.7 (?+0x0) [0x800a98500]
[ 45334.194] (EE) unw_get_proc_name failed: no unwind info found [-10]
[ 45334.194] (EE) 5: /usr/local/lib/dri/iris_dri.so (?+0x0) [0x802d77c10]
[ 45334.195] (EE) unw_get_proc_name failed: no unwind info found [-10]
[ 45334.195] (EE) 6: /usr/local/lib/dri/iris_dri.so (?+0x0) [0x802d7f280]
[ 45334.195] (EE) unw_get_proc_name failed: no unwind info found [-10]
[ 45334.195] (EE) 7: /usr/local/lib/dri/iris_dri.so (?+0x0) [0x802316c30]
[ 45334.196] (EE) 8: /usr/local/lib/libEGL.so.1 (?+0x0) [0x808150cc0]
[ 45334.197] (EE) 9: /usr/local/lib/libEGL.so.1 (?+0x0) [0x808143640]
[ 45334.197] (EE) 10: /usr/local/lib/xorg/modules/libglamoregl.so (?+0x0) [0x801b3c720]
[ 45334.198] (EE) 11: /usr/local/lib/xorg/modules/libglamoregl.so (?+0x0) [0x801b3d970]
[ 45334.199] (EE) 12: /usr/local/lib/xorg/modules/drivers/modesetting_drv.so (?+0x0) [0x801b1f0b0]
[ 45334.200] (EE) 13: /usr/local/lib/xorg/modules/drivers/modesetting_drv.so (?+0x0) [0x801b1a530]
[ 45334.200] (EE) 14: /usr/local/bin/Xorg (?+0x0) [0x29d6f0]
[ 45334.201] (EE) 15: /usr/local/bin/Xorg (?+0x0) [0x2e55a0]
[ 45334.202] (EE) 16: /usr/local/bin/Xorg (?+0x0) [0x2a1610]
[ 45334.203] (EE) 17: /usr/local/bin/Xorg (?+0x0) [0x28a330]
[ 45334.203] (EE) 18: ? (?+0x0) [0x800458008]
[ 45334.203] (EE) 
[ 45334.203] (EE) 
Fatal server error:
[ 45334.203] (EE) Caught signal 6 (Abort trap). Server aborting
[ 45334.203] (EE) 
[ 45334.203] (EE) 
Please consult the The X.Org Foundation support 
         at http://wiki.x.org
 for help. 
[ 45334.203] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 45334.203] (EE) 
[ 45334.211] (EE) Server terminated with error (1). Closing log file.