I can confirm the suspicion for this issue to relate to Meltdown/Spectre patching.
Running an Ubuntu 16.04 desktop in a virtual machine (VMware Workstation 12.5.9) on top of Windows 7. The hardware is a Dell T1700 with an i7-4770, and it seems the issue arose after BIOS and Microcode update. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1746806 Title: sssd appears to crash AWS c5 and m5 instances, cause 100% CPU To manage notifications about this bug go to: https://bugs.launchpad.net/cloud-images/+bug/1746806/+subscriptions -- ubuntu-bugs mailing list email@example.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs