Hi, The issue was first noticed on 2/11 and it was due to this patch https://lkml.org/lkml/2019/2/12/452 . The fix was suggested by Peter Z and I believe the fix is not merged yet to the mainline. Please use the above link to try the fix and build the kernel. It should work with the fix. I had tested it yesterday and it worked fine! Thanks, Gayatri From: PowerTop [mailto:powertop-bounces@lists.01.org] On Behalf Of Sparr Sent: Wednesday, February 13, 2019 4:13 PM To: powertop(a)lists.01.org Subject: [Powertop] SIGSEGV (Address boundary error) on Ubuntu 19.04 with kernel 5.0 The last time I ran powertop, a few days ago, it worked fine. Since then I've updated my kernel. Then today I get what looks like the usual initial behavior, output to the console like this: modprobe cpufreq_stats failedLoaded 391 prior measurements RAPL device for cpu 0 RAPL Using PowerCap Sysfs : Domain Mask f RAPL device for cpu 0 RAPL Using PowerCap Sysfs : Domain Mask f Devfreq not enabled glob returned GLOB_ABORTED then the console clears and there is an approx two second delay, which is also normal. Then when I would expect the first screen of data to appear, instead powertop crashes with SIGSEGV (Address boundary error). I'm putting further details of the segfault in this gist, which I can update as I learn more about using gdb and slowly bisect the kernel commit history to find the change that triggers the misbehavior. https://gist.github.com/sparr/fc97f4a265971bf720aedeaeb6874fd6 I would appreciate help in narrowing down the cause of the problem, or even someone confirming that they do or do not have this problem on kernel 5. Thank you.