Christopher Penalver, thank you for the clarification. I followed your instructions. Unfortunately, /var/crash is empty after the crashes.
The secondary kernel for linux-crashdump is loaded; cat /sys/kernel/kexec_crash_loaded returns 1. A test crash using echo c | sudo tee /proc/sysrq-trigger has the same symptoms as the actual oops , i.e., a completely unresponsive system. The system does not reboot after the test crash and /var/crash is also empty. I've waited for 90 minutes before forcing the reboot by turning off power. The memory is OK (test passed), and the crash is reproducible on a text console. As far as I can tell, the kernel logs are clean. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1228109 Title: [Lenovo ThinkCentre M91p] System freezes To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1228109/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
