Public bug reported: After enabling the hwe stack on ubuntu 18.04, perf no longer reports events
$ perf --version perf version 5.0.15 $ uname -a Linux ripper 5.0.0-23-generic #24~18.04.1-Ubuntu SMP Mon Jul 29 16:12:28 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux Results: perf does not report events Output of `perf top -p <PID>` looks like this: Samples: 0 of event 'cycles', 4000 Hz, Event count (approx.): 0 lost: 0/0 drop: 0/0 Overhead Expected results: events reported Additional info: - HWE stack was updated the standard way: sudo apt install --install-recommends linux-generic-hwe-18.04 - perf worked fine on linux kernel 4.15.0-55-generic (non-hwe) - the bug reproduces on the following architectures AMD Threadripper 1950X AMD Opteron 6376 Intel Core i7-8650U ** Affects: linux-hwe (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1839852 Title: perf broken on hwe kernel 5.0.0-23 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1839852/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs