# perf stat -e 'uncore_cbox_0/event=0x1f/,uncore_cbox_0/event=0x1f/,uncore_cbox_0/event=0x1f/' -a WARNING: CPU: 0 PID: 0 at arch/x86/events/core.c:718 perf_assign_events+0x2ae/0x2c0 Call Trace:dump_stack+0x68/0x93 __warn+0xcb/0xf0 warn_slowpath_null+0x1d/0x20 perf_assign_events+0x2ae/0x2c0 uncore_assign_events+0x1a7/0x250 [intel_uncore] uncore_pmu_event_add+0x7a/0x3c0 [intel_uncore] event_sched_in.isra.104+0xf6/0x2e0 group_sched_in+0x6e/0x190