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
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https://bugs.launchpad.net/bugs/1839852
Title:
perf broken on hwe kernel 5.0.0-23
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