Xorg server crash when Bonaire GPU is used

Brief summary of the problem:

Process Xorg dumps core at lightdm startup.

It happens always when Bonaire GPU is used after xorg-server was updated to 21.1.1-2.

This new xorg-server can sart OK with Vega20 GPU.

Hardware description:

• CPU: Intel(R) Core(TM) i7-3820 CPU @ 3.60GHz
• GPU (notice that Vega20 GPU was assigned to vfio at the kernel command line, only Bonaire GPU was used by xorg):
  • 03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Vega 20 [Radeon VII] (rev c1)
  • 04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Bonaire [Radeon R7 200 Series]
• System Memory: 32 GiB
• Display(s):
  • HDMI-0: Dell 1920x1200 @ 59.95
  • DisplayPort-0: Acer 3840x2160 @ 60.00
  • DVI-0: Dell 1920x1200 @ 59.95

System information:

• Distro: ArchLinux completely updated as of 2021-11-11
• Kernel: Linux phnm 5.14.16-arch1-1 drm/amd#1 (closed) SMP PREEMPT Tue, 02 Nov 2021 22:22:59 +0000 x86_64 GNU/Linux
• Video Driver: xf86-video-ati 1:19.1.0.r9.g5eba006e-1

Log files (for system lockups / game freezes / crashes)

• Dmesg log kernel.log
• Xorg log Xorg.0.log.old