https://bugzilla.kernel.org/show_bug.cgi?id=203879 Bug ID: 203879 Summary: hard freeze on high single threaded load when Xorg is active (AMD Ryzen 7 2700X CPU, AMD Radeon RX 580 GPU) Product: Drivers Version: 2.5 Kernel Version: 4.19.37-3 (Debian 4.19.0-5-amd64) and others (including mainline versions) Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx Reporter: claude@xxxxxxxxxxx Regression: No Created attachment 283233 --> https://bugzilla.kernel.org/attachment.cgi?id=283233&action=edit dmesg from 4.19.0-5-amd64 with amdgpu.dc=1 (no freeze yet) I am developing a CPU-based program to render fractals, which I usually run with "nice -n 20". The main calculations are multi-threaded, using 16 threads on AMD Ryzen 7 2700X Eight-Core Processor. However, final image PNG saving is single-threaded. During the single-threaded workload only (as observed by htop and program status prints), it can happen that the system freezes hard (no ssh, stuck mouse pointer, no NumLock LED toggle, no magic SysRq, only physical power button for hard power-off works). This freeze only happens when Xorg is running on the active virtual terminal: I tried to see if some kernel log messages would be displayed before freeze by switching to a console with Ctrl-Alt-F1 after launching my program, but with the terminal active it doesn't seem to freeze. The freeze does not always occur, but usually happens before a dozen images are saved (sequential process is full-threaded workload, followed by single-threaded workload, repeated). This can take a few hours. With the virtual terminal active instead of Xorg, I have rendered 100+ images in a row without any issues. Of course, I can't use other X applications at the same time, so this is an annoying workaround. I mostly run the regular Debian Buster kernel but I have had this freeze occur with other self-compiled kernels of various versions (newer than the Debian kernel, without Debian patches). I also had the freeze with both amdgpu.dc=1 (default) and amdgpu.dc=0 options. $ uname -a Linux eiskaffee 4.19.0-5-amd64 #1 SMP Debian 4.19.37-3 (2019-05-15) x86_64 GNU/Linux $ apt-cache policy linux-image-4.19.0-5-amd64 linux-image-4.19.0-5-amd64: Installed: 4.19.37-3 Candidate: 4.19.37-3 Version table: *** 4.19.37-3 990 990 http://ftp.uk.debian.org/debian buster/main amd64 Packages 500 http://ftp.uk.debian.org/debian unstable/main amd64 Packages 100 /var/lib/dpkg/status -- You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
