hang in test piglit with radeon

[Vladimir]

piglit test arb_shader_image_load_store-atomicity leads to hang if system uses radeon driver

sudo apt install piglit

dpkg -S arb_shader_image_load_store-atomicity
piglit: /usr/lib/x86_64-linux-gnu/piglit/bin/arb_shader_image_load_store-atomicity

/usr/lib/x86_64-linux-gnu/piglit/bin/arb_shader_image_load_store-atomicity -auto -fbo

after this command -- blank screen, no working keybord/mouse or ping on local network, only hard reset help. Rarely (once in 10-15 starts) there is a reboot

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xserver-xorg-video-radeon-hwe-18.04 1:19.1.0-1~18.04.1 [modified: usr/share/X11/xorg.conf.d/10-radeon.conf]
ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CurrentDesktop: XFCE
Date: Tue Sep 29 18:54:10 2020
InstallationDate: Installed on 2020-03-09 (204 days ago)
InstallationMedia: Xubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
SourcePackage: xserver-xorg-video-ati-hwe-18.04
UpgradeStatus: No upgrade log present (probably fresh install)