Bug description:
X crashes after ~12 hours.
Logs:

Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) intel(0): [DRI2] DRI2SwapComplete: bad drawable
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE)
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) Backtrace:
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) 0: /usr/lib/xorg-server/Xorg (OsLookupColor+0x139) [0x598529]
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) 1: /usr/lib/libc.so.6 (__restore_rt+0x0) [0x7f76a960267f]
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) 2: /usr/lib/xorg/modules/drivers/intel_drv.so (_init+0xf413f) [0x7f76a4368aaf]
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so (_init+0xf6727) [0x7f76a436d637]
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so (_init+0x64e60) [0x7f76a424a380]
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so (_init+0x68b30) [0x7f76a4251e20]
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) 6: /usr/lib/xorg-server/Xorg (WakeupHandler+0xaa) [0x43adfa]
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) 7: /usr/lib/xorg-server/Xorg (WaitForSomething+0x1ef) [0x590d4f]
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) 8: /usr/lib/xorg-server/Xorg (SendErrorToClient+0x10e) [0x4360ce]
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) 9: /usr/lib/xorg-server/Xorg (remove_fs_handlers+0x453) [0x43a2c3]
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) 10: /usr/lib/libc.so.6 (__libc_start_main+0xf0) [0x7f76a95ef610]
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) 11: /usr/lib/xorg-server/Xorg (_start+0x29) [0x4245d9]
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) 12: ? (?+0x29) [0x29]
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE)
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) Segmentation fault at address 0x0
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE)
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: Fatal server error:
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) Caught signal 11 (Segmentation fault). Server aborting
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE)
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE)
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: Please consult the The X.Org Foundation support
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: at http://wiki.x.org
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: for help.
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) Please also check the log file at "/home/daurnimator/.local/share/xorg/Xorg.0.log" for additional information.
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE)
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (II) AIGLX: Suspending AIGLX clients for VT switch
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (EE) Server terminated with error (1). Closing log file.
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: urxvt: X connection to ':0' broken, unable to recover, exiting.
Jan 05 18:37:48 daurn-m3800 org.a11y.atspi.Registry[956]: XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
Jan 05 18:37:48 daurn-m3800 org.a11y.atspi.Registry[956]: after 41809 requests (41809 known processed) with 0 events remaining.
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: subl3: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: [989:989:0105/183748:ERROR:chrome_browser_main_extra_parts_x11.cc(62)] X IO error received (X server probably went away)
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: [1107:1107:0105/183748:ERROR:x11_util.cc(82)] X IO error received (X server probably went away)
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (nm-applet:922): Gdk-WARNING **: nm-applet: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (cbatticon:925): Gdk-WARNING **: cbatticon: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.
Jan 05 18:37:48 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: thunar: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.
Jan 05 18:37:49 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: (pasystray:919): Gdk-WARNING **: pasystray: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.
Jan 05 18:37:49 daurn-m3800 /usr/lib/gdm/gdm-x-session[887]: E: awesome: a_xcb_io_cb:218: X server connection broke (error 1)
Jan 05 18:37:49 daurn-m3800 gdm-password][872]: pam_unix(gdm-password:session): session closed for user daurnimator
Jan 05 18:37:49 daurn-m3800 gnome-session[663]: (gnome-settings-daemon:778): color-plugin-WARNING **: no xrandr-AOC Intl-U2868-94 device found: Failed to find output xrandr-AOC Intl-U2868-94


System environment:
chipset: Integrated Graphics Chipset: Intel(R) HD Graphics 4600
xf86-video-intel: 1:2.99.917+519+g8229390-1
xorg-server: 1.18.0-3
mesa: 11.1.0-2
libdrm: 2.4.66-1
Linux distribution: Arch Linux
Machine or mobo model: Dell m3800
Display connector: eDP and HDMI

$ uname -a
Linux daurn-m3800 4.3.3-2-ARCH #1 SMP PREEMPT Wed Dec 23 20:09:18 CET 2015 x86_64 GNU/Linux


Reproducing steps:

Wait ~12 hours