Created attachment 129192 [details] [review]
minimal xorg config

Created attachment 129193 [details] [review]
Xorg log

X.Org X Server 1.19.1
Linux 4.8.13-1-vfio x86_64
Kernel command line: initrd=\intel-ucode.img initrd=\initramfs-linux-vfio.img root=UUID=8cac750e-95d1-4bee-a195-102248f57929 rw intel_iommu=on pcie_acs_override=downstream i915.enable_hd_vgaarb=1

This bug is randomly reproductible on my machine.

Step to reproduce :
 * Open a web browser
 * Load a page with many drawing (like maps with overlay)
 * Move until it crash

I am affected by this bug as well and is randomly reproducible. I am on Arch Linux and was only able to retrieve applicable debugging information by attaching gdb to my x session [Xorg logs show no errors, journalctl gives several "Fatal IO error 11 (Resource temporarily unavailable) on X server :0" errors per application]. X version and kernel info-

X.Org X Server 1.19.3
Release Date: 2017-03-15
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.12.5-1-ARCH x86_64 
Current Operating System: Linux <hostname> 4.12.8-1-vfio #1 SMP PREEMPT Wed Aug 30 08:11:32 EDT 2017 x86_64
Kernel command line: BOOT_IMAGE=/vmlinuz-linux-vfio root=UUID=07fb0a6d-1af6-4357-918d-868cb406bee0 rw resume=UUID=5c8e6441-63e8-4723-9535-9450009f19ee intel_iommu=on pcie_acs_override=downstream
Build Date: 13 August 2017  09:37:50PM

This has affected me for prior X server versions as well since June 2017.

Created attachment 133945 [details]
Xorg gdb Backtrace

Looks like https://patchwork.freedesktop.org/patch/170077/ should fix this.

I've applied the patch and have gone a few days without any crashes. Exciting stuff! Will update if the situation changes

(In reply to Zach Carmichael from comment #7)
> I've applied the patch and have gone a few days without any crashes.
> Exciting stuff! Will update if the situation changes

Calling this one fixed then.