Public bug reported:

Environment:

Description:    Ubuntu 14.04.5 LTS
Release:        14.04

xserver-xorg-video-intel-lts-wily - 2:2.99.917+git20150808-0ubuntu4~trusty2
libpixman-1-0:amd64 - 0.30.2-2ubuntu1.1
libc-bin - 2.19-0ubuntu6.9

IntelĀ® HD Graphics 530

00:02.0 VGA compatible controller: Intel Corporation Sky Lake Integrated
Graphics (rev 06)

        *-display
             description: VGA compatible controller
             product: Sky Lake Integrated Graphics
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 06
             width: 64 bits
             clock: 33MHz
             capabilities: pciexpress msi pm vga_controller bus_master cap_list 
rom
             configuration: driver=i915 latency=0
             resources: irq:126 memory:e0000000-e0ffffff 
memory:d0000000-dfffffff ioport:3000(size=64)


Trigger condition:
- Bizarre and unusual to replicate, however, should not be causing a segfault. 
In this case I was trying to connect to a remote system using the NoMachine 
nxclient binary.

Expected Result:
- X server does not crash

Actual Result:
- X server does crash, leaving backtrace:

[346660.571] (EE) Backtrace:
[346660.571] (EE) 0: /usr/bin/X (xorg_backtrace+0x48) [0x55d34ff3b308]
[346660.571] (EE) 1: /usr/bin/X (0x55d34fd9a000+0x1a5359) [0x55d34ff3f359]
[346660.571] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7fc427d5a000+0x36cb0) 
[0x7fc427d90cb0]
[346660.571] (EE) 3: /usr/lib/x86_64-linux-gnu/libpixman-1.so.0 
(pixman_region_contains_rectangle+0xd1) [0x7fc428cbfec1]
[346660.571] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fc423b4a000+0x645f0) [0x7fc423bae5f0]
[346660.571] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fc423b4a000+0xa67ae) [0x7fc423bf07ae]
[346660.571] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fc423b4a000+0xa9043) [0x7fc423bf3043]
[346660.571] (EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so 
(0x7fc423b4a000+0x8c5d0) [0x7fc423bd65d0]
[346660.571] (EE) 8: /usr/bin/X (0x55d34fd9a000+0x123f73) [0x55d34febdf73]
[346660.571] (EE) 9: /usr/bin/X (0x55d34fd9a000+0x5433e) [0x55d34fdee33e]
[346660.571] (EE) 10: /usr/bin/X (0x55d34fd9a000+0x5818b) [0x55d34fdf218b]
[346660.571] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) 
[0x7fc427d7bf45]
[346660.571] (EE) 12: /usr/bin/X (0x55d34fd9a000+0x4370e) [0x55d34fddd70e]
[346660.571] (EE) 
[346660.571] (EE) Segmentation fault at address 0x55d3f200ac36

** Affects: xserver-xorg-video-intel-lts-wily (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Xorg.0.log.old"
   
https://bugs.launchpad.net/bugs/1624486/+attachment/4742140/+files/Xorg.0.log.old

** Summary changed:

- Xorg crashes when using nxclient
+ Xorg Segmentation Fault from xserver-xorg-video-intel-lts-wily

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https://bugs.launchpad.net/bugs/1624486

Title:
  Xorg Segmentation Fault from xserver-xorg-video-intel-lts-wily

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