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On 2017-07-31T21:54:53+00:00 Zygfryd wrote:

Created attachment 133165
gdb log of Xorg execution and crash stacktrace

Steps to reproduce:

1) Have an AMD GPU as your display device (radeon or modesetting, doesn't 
matter)
2) Have an Intel iGPU, unused
3) Start an X session, grab a window corner and keep moving your mouse for a 
couple minutes, or just use your computer normally for up to a couple hours.

Xorg was compiled using GCC 4.9.4 with CFLAGS="-march=core-avx2 -O2
-pipe -ggdb"

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1839174/comments/0

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On 2017-08-03T04:35:52+00:00 Keith Packard wrote:

I've posted a proposed patch for this, although I have no way to test to
see if it helps. What it does is prevent the main thread and input
thread from scrambling the pointer private structures used by the VGA
arbiter.

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1839174/comments/1

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On 2017-12-13T17:48:17+00:00 Ajax-a wrote:

commit cf7517675d988c2d1ff967d6d162a17acbdad466
Author: Keith Packard <kei...@keithp.com>
Date:   Wed Aug 2 21:34:52 2017 -0700

    xfree86: Hold input_lock across SPRITE functions in VGA arbiter
    
    Avoid scrambling the sprite functions wrapper.
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101995
    Signed-off-by: Keith Packard <kei...@keithp.com>
    Reviewed-by: Adam Jackson <a...@redhat.com>

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1839174/comments/2


** Changed in: xorg-server
       Status: Unknown => Fix Released

** Changed in: xorg-server
   Importance: Unknown => Medium

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server-hwe-18.04 in Ubuntu.
https://bugs.launchpad.net/bugs/1839174

Title:
  Xorg crashes in stdio functions under pci_device_vgaarb_set_target()
  from VGAGet() from VGAarbiterSpriteMoveCursor()

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