I am seeing the same crash with the same backtrace:

[512937.361] (II) intel(0): resizing framebuffer to 1600x900
[512937.365] (II) intel(0): switch to mode 1600x900@60.0 on LVDS1 using pipe 0, 
position (0, 0), rotation normal, reflection none
[642161.462] (EE) 
[642161.465] (EE) Backtrace:
[642161.475] (EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x7f2332fa6df6]
[642161.476] (EE) 1: /usr/bin/X (0x7f2332df4000+0x1b7009) [0x7f2332fab009]
[642161.476] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f2330cf3000+0x35180) 
[0x7f2330d28180]
[642161.476] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7f232ca95000+0x5e2aa) [0x7f232caf32aa]
[642161.476] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7f232ca95000+0xf6cd2) [0x7f232cb8bcd2]
[642161.476] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7f232ca95000+0x10ba30) [0x7f232cba0a30]
[642161.476] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7f232ca95000+0x10ce3c) [0x7f232cba1e3c]
[642161.476] (EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7f232ca95000+0x10d828) [0x7f232cba2828]
[642161.476] (EE) 8: /usr/bin/X (DRI2SwapBuffers+0x1d0) [0x7f2332f797a0]
[642161.476] (EE) 9: /usr/bin/X (0x7f2332df4000+0x18711c) [0x7f2332f7b11c]
[642161.476] (EE) 10: /usr/bin/X (0x7f2332df4000+0x58117) [0x7f2332e4c117]
[642161.476] (EE) 11: /usr/bin/X (0x7f2332df4000+0x5c29b) [0x7f2332e5029b]
[642161.476] (EE) 12: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) 
[0x7f2330d14b45]
[642161.476] (EE) 13: /usr/bin/X (0x7f2332df4000+0x4668e) [0x7f2332e3a68e]
[642161.476] (EE) 
[642161.476] (EE) Segmentation fault at address 0x7f233324b000
[642161.476] (EE) 
Fatal server error:
[642161.476] (EE) Caught signal 11 (Segmentation fault). Server aborting
[642161.476] (EE) 
[642161.476] (EE) 

I sometimes use multiple monitors, like OP, but this crash seems to be
far removed from that. Both times I've seen this crash I've been using
Google Chrome.

MM

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