Hi, Pasi Kallinen reported in Debian a regression with perf r5101c4 counter, initially it was found in https://github.com/rr-debugger/rr/issues/3949 but said to be a kernel problem.
On Tue, May 06, 2025 at 07:18:39PM +0300, Pasi Kallinen wrote: > Package: src:linux > Version: 6.12.25-1 > Severity: normal > X-Debbugs-Cc: debian-am...@lists.debian.org, pa...@alt.org > User: debian-am...@lists.debian.org > Usertags: amd64 > > Dear Maintainer, > > perf stat -e r5101c4 true > > reports "not supported". > > The counters worked in kernel 6.11.10. > > I first noticed this not working when updating to 6.12.22. > Booting back to 6.11.10, the counters work correctly. Does this ring a bell? Would you be able to bisect the changes to identify where the behaviour changed? Regards, Salvatore
