apport information ** Attachment added: "Lsusb-t.txt" https://bugs.launchpad.net/bugs/1982965/+attachment/5605607/+files/Lsusb-t.txt
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1982965 Title: Random crashes related to CPU virtualization - have a sure way to replicate the crashes Status in linux package in Ubuntu: Confirmed Bug description: Description: Hardware configurations: CPU: AMD Ryzen 7 5700G with Radeon Graphics Motherboard: Gigabyte B550M D3H BIOS version: F14 then F15c, both exhibited the same behaviors. F15c seems to be a little more resilient to the crashes, meaning the execution of glmark2 lasts a little longer before crashes. OS: Linux Mint 20.3 / with a number of Ubuntu kernels from 5.11, 5.13, and 5.15 Due to the CPU and motherboard, have to use non-packaged kernels for both graphics and network interface to work. Once the CPU virtualization is turned-on, system starts to crash randomly. For Gigabyte motherboard CPU virtualization is called SVM mode. All crashes occurred under CPU SVM mode is enabled. Crashes means, I just received black screen, no keyboard or mouse response. Had to power cycle the computer to resume operations. Tried to store the syslog for each boot ended in crash. At beginning, I tried to sync the file system at rebooting the computer, but the computer boots up without syncing the file system as well. After almost three months of bad experiences, tried to upgrade kernel from 5.11 to 5.15, none of them helped. The packaged kernel 5.4 doesn't have proper drivers for both the graphics and network interfaces. Methods of replicating the crashes: 1. Turn on the SVM mode in BIOS. 2. Execute glmark2 to benchmark the graphic card performance. 3. System crashes before the benchmark test is done. To me the syslogs doesn't show any meaningful info for the crashes. The following link gives some of the syslog gathered in the painful experiences especially those crashes shortly after reboot. https://drive.google.com/drive/folders/1cYbQPdfPSC_6A879xBWRs1jIY7R5ylMU?usp=sharing The Key Finding: Once the SVM mode on the motherboard is turned off (disabled), I no longer experience the same kind of random crashes, and glmark2 can finish without any issues. All versions of kernel 5.11 to 5.15 work stably as expected. That's all I can report here. If you need any further information. Please feel free to let me know. Thanks for your attentions. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1982965/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
