This bug seems to be the closest match to what I'm experiencing. I'm hitting similar trouble on desktop/graphical Ubuntu on some Dell laptops.
Ubuntu 16.04 AMD64. Happening on kernel versions 4.13.0-38 and 4.4.0-116. I've tried version 4.4.0-117 as posted by @kamalmostafa - same result. The laptops are an XPS 13 and a Precision M3520. Both machines have Kaby Lake/7th gen Core i7 CPUs. The problem on the 4.4.0-116 kernel (on my M3520) occurred the first reboot after updating the Intel microcode. I'm starting to think this is related to the Meltdown/Spectre patching. I started sssd in the foreground with debug set to 9 on the M3520 and netcat'd the results to another machine, so I think I have it right up until the laptop stops responding. It's obviously quite verbose, but if someone thinks it'll help, I'll post it. >From talking to some of the people on #ubuntu-server, the microcode does seem to be increasingly likely the root cause. Bug #1759920 may include relevant information. -- 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 ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
