perf: fuzzer, lots of warnings

[Vince Weaver]

So this does seem to have gotten worse with 4.2-rc0.  Four warnings are 
triggered more or less immediately after starting fuzzing.


(#1)

WARNING: CPU: 0 PID: 32434 at arch/x86/kernel/cpu/perf_event.c:1219 x86_pmu_start+0xaa/0x100()

	if (WARN_ON_ONCE(!(event->hw.state & PERF_HES_STOPPED)))

[  224.158535]  [<ffffffff8102a1ea>] x86_pmu_start+0xaa/0x100
[  224.164401]  [<ffffffff81159f39>] perf_ioctl+0x429/0x470
[  224.170101]  [<ffffffff811f199a>] do_vfs_ioctl+0x2ba/0x4a0
[  224.176012]  [<ffffffff811fef14>] ? mntput+0x24/0x40
[  224.181343]  [<ffffffff811df3ea>] ? __fput+0x17a/0x1e0
[  224.186858]  [<ffffffff811f1bf9>] SyS_ioctl+0x79/0x90
[  224.192275]  [<ffffffff816a64b2>] entry_SYSCALL_64_fastpath+0x16/0x7a

(#2)

[  584.352324] WARNING: CPU: 2 PID: 18924 at arch/x86/kernel/cpu/perf_event_intel_ds.c:1198 intel_pmu_drain_pebs_nhm+0x283/0x2e0()
	(this one was described in a previous e-mail)


(#3)

[ 1210.501445] WARNING: CPU: 6 PID: 0 at arch/x86/kernel/cpu/perf_event.c:1307 x86_pmu_stop+0xb8/0xd0()

	WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);

[ 1210.653328]  [<ffffffff810291b8>] x86_pmu_stop+0xb8/0xd0
[ 1210.659466]  [<ffffffff81029216>] x86_pmu_del+0x46/0x140
[ 1210.665607]  [<ffffffff81156244>] event_sched_out.isra.80+0x124/0x320
[ 1210.672924]  [<ffffffff81156553>] ? __perf_event_disable+0x53/0x130
[ 1210.680097]  [<ffffffff81156488>] group_sched_out+0x48/0xc0
[ 1210.686530]  [<ffffffff8101d2a8>] ? native_sched_clock+0x28/0x90
[ 1210.693445]  [<ffffffff811565fe>] __perf_event_disable+0xfe/0x130
[ 1210.700408]  [<ffffffff811532c0>] ? cpu_clock_event_start+0x40/0x40
[ 1210.707550]  [<ffffffff81153302>] remote_function+0x42/0x50
[ 1210.713942]  [<ffffffff810f0dab>] flush_smp_call_function_queue+0x7b/0x170
[ 1210.721762]  [<ffffffff810f1793>] generic_smp_call_function_single_interrupt+0x13/0x60
[ 1210.730679]  [<ffffffff81049228>] smp_trace_call_function_single_interrupt+0x38/0xb0
[ 1210.739467]  [<ffffffff816a78db>] trace_call_function_single_interrupt+0x6b/0x70
[ 1210.747820]  <EOI>  [<ffffffff81543f24>] ? cpuidle_enter_state+0xf4/0x220
[ 1210.755614]  [<ffffffff81543f00>] ? cpuidle_enter_state+0xd0/0x220
[ 1210.762708]  [<ffffffff81544087>] cpuidle_enter+0x17/0x20
[ 1210.768966]  [<ffffffff810b05db>] call_cpuidle+0x3b/0x70
[ 1210.775135]  [<ffffffff81544063>] ? cpuidle_select+0x13/0x20
[ 1210.781637]  [<ffffffff810b0855>] cpu_startup_entry+0x245/0x310
[ 1210.788411]  [<ffffffff81049a40>] start_secondary+0x120/0x130

(#4)

[ 1638.702578] WARNING: CPU: 2 PID: 25543 at arch/x86/kernel/cpu/perf_event_intel_lbr.c:349 intel_pmu_lbr_disable+0xbc/0xd0()

	WARN_ON_ONCE(cpuc->lbr_users < 0);

[ 1638.857921]  [<ffffffff8102e56c>] intel_pmu_lbr_disable+0xbc/0xd0
[ 1638.864874]  [<ffffffff81031812>] intel_pmu_disable_event+0xc2/0x130
[ 1638.872125]  [<ffffffff81030a49>] ? __intel_pmu_disable_all+0x49/0x70
[ 1638.879455]  [<ffffffff81029175>] x86_pmu_stop+0x75/0xd0
[ 1638.885560]  [<ffffffff81159f1a>] perf_ioctl+0x40a/0x470
[ 1638.891650]  [<ffffffff811f199a>] do_vfs_ioctl+0x2ba/0x4a0
[ 1638.897945]  [<ffffffff811dd9ac>] ? vfs_read+0x11c/0x130
[ 1638.904069]  [<ffffffff811f27bd>] ? poll_select_set_timeout+0x4d/0x70
[ 1638.911417]  [<ffffffff811f1bf9>] SyS_ioctl+0x79/0x90
[ 1638.917295]  [<ffffffff816a64b2>] entry_SYSCALL_64_fastpath+0x16/0x7a

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