FYI, we noticed the following commit: commit: 333b566559019b146905c623bde7f455c1d5add3 ("perf pmu: Improve error messages for missing PMUs") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master in testcase: perf-sanity-tests with following parameters: on test machine: 72 threads Intel(R) Xeon(R) CPU E5-2699 v3 @ 2.30GHz with 128G memory caused below changes: 2017-09-23 14:57:41 sudo /usr/src/linux-perf-x86_64-rhel-7.2-333b566559019b146905c623bde7f455c1d5add3/tools/perf/perf test 60 60: Intel cqm nmi context read : FAILED! To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Xiaolong