On Sat, Feb 17, 2018 at 02:21:19PM +0800, kernel test robot wrote: > [ 242.731381] WARNING: CPU: 3 PID: 1107 at arch/x86/events/intel/ds.c:1326 > intel_pmu_save_and_restart_reload+0x87/0x90
That's the one asserting the PMU is in fact disabled. > [ 242.731417] CPU: 3 PID: 1107 Comm: netserver Not tainted > 4.15.0-00001-g41e062c #1 > [ 242.731418] Hardware name: LENOVO IdeaPad U410 /Lenovo , BIOS > 65CN15WW 06/05/2012 > [ 242.731422] RIP: 0010:intel_pmu_save_and_restart_reload+0x87/0x90 > [ 242.731423] RSP: 0018:fffffe000008c8d0 EFLAGS: 00010002 > [ 242.731425] RAX: 0000000000000001 RBX: ffff88007d069800 RCX: > 0000000000000000 > [ 242.731426] RDX: 0000000000000001 RSI: 0000000000000001 RDI: > ffff88007d069800 > [ 242.731427] RBP: 0000000000000010 R08: 0000000000000001 R09: > 0000000000000001 > [ 242.731428] R10: 00000000000000b0 R11: 0000000000003000 R12: > 00000000000f4243 > [ 242.731429] R13: 0000000000000001 R14: 0000000000000000 R15: > 0000000000000001 > [ 242.731431] FS: 00007f1501639700(0000) GS:ffff880112ac0000(0000) > knlGS:0000000000000000 > [ 242.731432] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 242.731433] CR2: 00007f65a1394d68 CR3: 000000007f62a006 CR4: > 00000000001606e0 > [ 242.731434] Call Trace: > [ 242.731438] <NMI> > [ 242.731443] __intel_pmu_pebs_event+0xc8/0x260 > [ 242.731452] ? intel_pmu_drain_pebs_nhm+0x211/0x2f0 > [ 242.731454] intel_pmu_drain_pebs_nhm+0x211/0x2f0 > [ 242.731457] intel_pmu_handle_irq+0x12d/0x4b0 > [ 242.731464] ? perf_event_nmi_handler+0x2d/0x50 > [ 242.731466] perf_event_nmi_handler+0x2d/0x50 > [ 242.731470] nmi_handle+0x6a/0x130 > [ 242.731473] default_do_nmi+0x4e/0x110 > [ 242.731475] do_nmi+0xe5/0x140 > [ 242.731479] end_repeat_nmi+0x1a/0x54 And this should have shown with any testing I think. The problem appears to be that intel_pmu_handle_irq() uses __intel_pmu_disable_all() which 'forgets' to clear cpuc->enabled as per x86_pmu_disable().
