-
*** perf_fuzzer 0.30-pre *** by Vince Weaver
Linux version 3.19.0+ x86_64
Processor: Intel 6/60/3
Seeding random number generator with 1424717287
/proc/sys/kernel/perf_event_max_sample_rate currently: 6250/s
/proc/sys/kernel/perf_event_paranoid currently: 1
Logging perf_event_open() failures: no
Running fsync after every syscall: no
To reproduce, try: ./perf_fuzzer -s 30000 -r 1424717287
Pid=9176, sleeping 1s
==================================================
Fuzzing the following syscalls:
mmap perf_event_open close read write ioctl fork prctl poll
*NOT* Fuzzing the following syscalls:
Also attempting the following:
signal-handler-on-overflow busy-instruction-loop accessing-perf-proc-and-sys-files trashing-the-mmap-page
*NOT* attempting the following:
==================================================
Iteration 10000
Open attempts: 207133 Successful: 938
EPERM : 42
ENOENT : 1678
E2BIG : 19953
EBADF : 9476
EACCES : 1034
EINVAL : 173426
ENOSPC : 6
EOPNOTSUPP : 580
Type (Hardware 233/27305)(software 322/30705)(tracepoint 83/30510)(Cache 80/25604)(cpu 190/30144)(breakpoint 30/30569)(power 0/4400)(uncore_imc 0/4227)(#8 0/101)(#9 0/35)(#10 0/49)(#11 0/24)(#12 0/31)(#13 0/22)(#14 0/30)(>14 0/23377)
Close attempts: 905 Successful: 905
Read attempts: 884 Successful: 790
Write attempts: 915 Successful: 0
Ioctl attempts: 837 Successful: 371
Mmap attempts: 938 Successful: 378
Prctl attempts: 907 Successful: 907
Fork attempts: 450 Successful: 450
Poll attempts: 918 Successful: 893
Access attempts: 956 Successful: 465
Trash mmap attempts: 916 Successful: 916
Overflows: 0
SIGIOs due to RT signal queue full: 0
[335638.252654] ------------[ cut here ]------------
[335638.257675] WARNING: CPU: 1 PID: 9176 at kernel/watchdog.c:290 watchdog_overflow_callback+0x92/0xc0()
[335638.267649] Watchdog detected hard LOCKUP on cpu 1
[335638.272715] Modules linked in: fuse x86_pkg_temp_thermal snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic intel_powerclamp intel_rapl iosf_mbi coretemp snd_hda_intel kvm snd_hda_controller crct10dif_pclmul snd_hda_codec crc32_pclmul snd_hwdep ghash_clmulni_intel snd_pcm aesni_intel i915 snd_timer ppdev aes_x86_64 evdev drm_kms_helper iTCO_wdt lrw snd drm mei_me gf128mul iTCO_vendor_support soundcore glue_helper mei parport_pc xhci_pci i2c_algo_bit tpm_tis tpm ablk_helper i2c_i801 cryptd lpc_ich mfd_core battery video xhci_hcd parport processor wmi psmouse pcspkr serio_raw button sg sr_mod cdrom sd_mod ahci ehci_pci libahci ehci_hcd libata e1000e scsi_mod ptp crc32c_intel usbcore usb_common pps_core thermal fan thermal_sys
[335638.344480] CPU: 1 PID: 9176 Comm: perf_fuzzer Not tainted 3.19.0+ #128
[335638.351642] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014
[335638.359638] ffffffff81a49b7f ffff88011ea45aa0 ffffffff816c2a19 0000000000000000
[335638.367755] ffff88011ea45af0 ffff88011ea45ae0 ffffffff8106deaa ffff88011ea45b00
[335638.375871] ffff880119b8f800 0000000000000000 ffff88011ea45c40 ffff88011ea45ef8
[335638.383969] Call Trace:
[335638.386688] [] dump_stack+0x45/0x57
[335638.392997] [] warn_slowpath_common+0x8a/0xc0
[335638.399554] [] warn_slowpath_fmt+0x46/0x50
[335638.405807] [] ? native_sched_clock+0x2a/0x90
[335638.412333] [] ? native_sched_clock+0x2a/0x90
[335638.418865] [] watchdog_overflow_callback+0x92/0xc0
[335638.425946] [] __perf_event_overflow+0x91/0x270
[335638.432641] [] ? x86_perf_event_set_period+0xca/0x170
[335638.439932] [] perf_event_overflow+0x19/0x20
[335638.446393] [] intel_pmu_handle_irq+0x1ba/0x3a0
[335638.453110] [] perf_event_nmi_handler+0x2b/0x50
[335638.460433] [] nmi_handle+0xa0/0x150
[335638.466715] [] ? nmi_handle+0x5/0x150
[335638.473094] [] default_do_nmi+0x4a/0x140
[335638.479780] [] do_nmi+0x98/0xe0
[335638.485576] [] end_repeat_nmi+0x1e/0x2e
[335638.492132] [] ? trace_page_fault+0x30/0x30
[335638.499083] [] ? trace_page_fault+0x30/0x30
[335638.506012] [] ? trace_page_fault+0x30/0x30
[335638.512900] <> [] ? copy_user_handle_tail+0x3b/0x80
[335638.521843] [] copy_from_user_nmi+0x63/0x70
[335638.528815] [] perf_callchain_user+0xd0/0x240
[335638.535934] [] ? __perf_event_overflow+0xd9/0x270
[335638.543427] [] perf_callchain+0x1f8/0x220
[335638.550187] [] perf_prepare_sample+0x291/0x3c0
[335638.557404] [] ? perf_swevent_event+0x67/0x90
[335638.564556] [] __perf_event_overflow+0x10e/0x270
[335638.571961] [] ? __perf_event_overflow+0xd9/0x270
[335638.579486] [] perf_swevent_overflow+0xa9/0xe0
[335638.586786] [] perf_swevent_event+0x67/0x90
[335638.593746] [] perf_tp_event+0xc4/0x210
[335638.600335] [] ? lock_release+0x130/0x260
[335638.607138] [] ? __lock_acquire.isra.31+0x3af/0xfe0
[335638.614822] [] ? perf_trace_buf_prepare+0x98/0xf0
[335638.622332] [] ? perf_trace_lock+0x12a/0x160
[335638.629377] [] ? __sigqueue_alloc+0x5/0x150
[335638.636312] [] ? __sigqueue_alloc+0x134/0x150
[335638.643429] [] ? perf_trace_buf_prepare+0x98/0xf0
[335638.650947] [] ? __lock_task_sighand+0x6e/0x110
[335638.658293] [] perf_trace_lock+0x12a/0x160
[335638.665163] [] ? __lock_task_sighand+0x78/0x110
[335638.672481] [] ? do_send_sig_info+0x5d/0x80
[335638.679409] [] lock_release+0x130/0x260
[335638.685968] [] _raw_spin_unlock_irqrestore+0x24/0x40
[335638.693716] [] do_send_sig_info+0x5d/0x80
[335638.700483] [] send_sigio_to_task+0x12f/0x1a0
[335638.707592] [] ? send_sigio_to_task+0x5/0x1a0
[335638.714768] [] ? send_sigio+0x56/0x100
[335638.721256] [] send_sigio+0xae/0x100
[335638.727556] [] kill_fasync+0x97/0xf0
[335638.733868] [] ? kill_fasync+0xf/0xf0
[335638.740274] [] perf_event_wakeup+0xd4/0xf0
[335638.747103] [] ? perf_event_wakeup+0x5/0xf0
[335638.754045] [] ? __do_softirq+0x22f/0x290
[335638.760779] [] perf_pending_event+0x33/0x60
[335638.767680] [] irq_work_run_list+0x4c/0x80
[335638.774481] [] irq_work_run+0x18/0x40
[335638.780814] [] smp_irq_work_interrupt+0x2e/0x40
[335638.788052] [] irq_work_interrupt+0x6d/0x80
[335638.794947] [] ? _raw_spin_unlock+0x2b/0x40
[335638.802442] [] ? generic_exec_single+0x133/0x190
[335638.809701] [] ? task_clock_event_add+0x40/0x40
[335638.816839] [] smp_call_function_single+0x67/0xa0
[335638.824178] [] task_function_call+0x49/0x60
[335638.830977] [] ? perf_event_sched_in+0xa0/0xa0
[335638.838029] [] _perf_event_enable+0x90/0xf0
[335638.844816] [] ? task_function_call+0x60/0x60
[335638.851784] [] perf_event_for_each_child+0x3f/0xb0
[335638.859234] [] perf_event_task_enable+0x7c/0xd0
[335638.866359] [] SyS_prctl+0x26d/0x4d0
[335638.872478] [] system_call_fastpath+0x16/0x1b
[335638.879446] ---[ end trace 4ad3a65969f2b314 ]---
[335638.885003] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 632.284 msecs
[335638.894402] perf interrupt took too long (4940903 > 38461), lowering kernel.perf_event_max_sample_rate to 3250
[335647.623863] perf interrupt took too long (4902309 > 71428), lowering kernel.perf_event_max_sample_rate to 1750
[335650.095436] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 5, t=5252 jiffies, g=24160777, c=24160776, q=240)
-
Stopping after 30000
Watchdog enabled with timeout 60s
Will auto-exit if signal storm detected
*** perf_fuzzer 0.30-pre *** by Vince Weaver
Linux version 3.19.0+ x86_64
Processor: Intel 6/60/3
Seeding random number generator with 1424327180
/proc/sys/kernel/perf_event_max_sample_rate currently: 50000/s
/proc/sys/kernel/perf_event_paranoid currently: 1
Logging perf_event_open() failures: no
Running fsync after every syscall: no
To reproduce, try: ./perf_fuzzer -s 30000 -r 1424327180
Pid=3921, sleeping 1s
==================================================
Fuzzing the following syscalls:
mmap perf_event_open close read write ioctl fork prctl poll
*NOT* Fuzzing the following syscalls:
Also attempting the following:
signal-handler-on-overflow busy-instruction-loop accessing-perf-proc-and-sys-files trashing-the-mmap-page
*NOT* attempting the following:
==================================================
Iteration 10000
Open attempts: 195229 Successful: 920
EPERM : 27
ENOENT : 1640
E2BIG : 18829
EBADF : 9066
EACCES : 956
EINVAL : 163244
EOPNOTSUPP : 547
Type (Hardware 213/25831)(software 360/29001)(tracepoint 80/28845)(Cache 78/24213)(cpu 170/28287)(breakpoint 19/28643)(power 0/3991)(uncore_imc 0/4028)(#8 0/78)(#9 0/31)(#10 0/24)(#11 0/24)(#12 0/24)(#13 0/24)(#14 0/23)(>14 0/22162)
Close attempts: 877 Successful: 877
Read attempts: 861 Successful: 792
Write attempts: 897 Successful: 0
Ioctl attempts: 937 Successful: 395
Mmap attempts: 920 Successful: 374
Prctl attempts: 892 Successful: 892
Fork attempts: 463 Successful: 463
Poll attempts: 916 Successful: 874
Access attempts: 904 Successful: 438
Trash mmap attempts: 919 Successful: 919
Overflows: 0
SIGIOs due to RT signal queue full: 0
[ 7938.495396] ------------[ cut here ]------------
[ 7938.500373] WARNING: CPU: 2 PID: 5692 at kernel/watchdog.c:290 watchdog_overflow_callback+0x92/0xc0()
[ 7938.510337] Watchdog detected hard LOCKUP on cpu 2
[ 7938.515301] Modules linked in: fuse x86_pkg_temp_thermal intel_powerclamp intel_rapl iosf_mbi coretemp kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel snd_hda_controller snd_hda_codec i915 aes_x86_64 lrw gf128mul ppdev iTCO_wdt xhci_pci snd_hwdep snd_pcm tpm_tis evdev glue_helper iTCO_vendor_support xhci_hcd snd_timer mei_me drm_kms_helper ablk_helper snd tpm mei drm psmouse serio_raw pcspkr parport_pc cryptd soundcore lpc_ich parport wmi mfd_core battery i2c_i801 i2c_algo_bit button processor video sg sr_mod sd_mod cdrom ahci libahci ehci_pci libata ehci_hcd e1000e ptp crc32c_intel scsi_mod usbcore usb_common pps_core fan thermal thermal_sys
[ 7938.586970] CPU: 2 PID: 5692 Comm: perf_fuzzer Not tainted 3.19.0+ #127
[ 7938.594053] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014
[ 7938.601990] ffffffff81a41afe ffff88011ea85aa0 ffffffff816bfed5 0000000000000000
[ 7938.610056] ffff88011ea85af0 ffff88011ea85ae0 ffffffff8106ddfa 0000000000000000
[ 7938.618102] ffff8801195a1800 0000000000000000 ffff88011ea85c40 ffff88011ea85ef8
[ 7938.626105] Call Trace:
[ 7938.628735] [] dump_stack+0x45/0x57
[ 7938.634940] [] warn_slowpath_common+0x8a/0xc0
[ 7938.641394] [] warn_slowpath_fmt+0x46/0x50
[ 7938.647566] [] watchdog_overflow_callback+0x92/0xc0
[ 7938.654617] [] __perf_event_overflow+0x91/0x270
[ 7938.661233] [] ? x86_perf_event_set_period+0xca/0x170
[ 7938.668419] [] perf_event_overflow+0x19/0x20
[ 7938.674764] [] intel_pmu_handle_irq+0x1ba/0x3a0
[ 7938.681432] [] perf_event_nmi_handler+0x2b/0x50
[ 7938.688055] [] nmi_handle+0xa0/0x150
[ 7938.693681] [] ? nmi_handle+0x5/0x150
[ 7938.699405] [] default_do_nmi+0x4a/0x140
[ 7938.705429] [] do_nmi+0x98/0xe0
[ 7938.710573] [] end_repeat_nmi+0x1e/0x2e
[ 7938.716470] [] ? copy_from_user_nmi+0x20/0x70
[ 7938.722929] [] ? copy_from_user_nmi+0x20/0x70
[ 7938.729386] [] ? copy_from_user_nmi+0x20/0x70
[ 7938.735862] <> [] ? perf_callchain_user+0xd0/0x240
[ 7938.744067] [] perf_callchain+0x1f8/0x220
[ 7938.750152] [] perf_prepare_sample+0x291/0x3c0
[ 7938.756700] [] __perf_event_overflow+0x10e/0x270
[ 7938.763412] [] ? __perf_event_overflow+0xd9/0x270
[ 7938.770254] [] ? perf_tp_event+0xc4/0x210
[ 7938.776302] [] ? perf_prepare_sample+0x2ec/0x3c0
[ 7938.783021] [] ? trace_page_fault+0x28/0x30
[ 7938.789319] [] perf_swevent_overflow+0xa9/0xe0
[ 7938.795845] [] perf_swevent_event+0x67/0x90
[ 7938.802139] [] perf_tp_event+0xc4/0x210
[ 7938.808025] [] ? lock_release+0x130/0x260
[ 7938.814132] [] ? __lock_acquire.isra.31+0x3af/0xfe0
[ 7938.821124] [] ? perf_trace_buf_prepare+0x98/0xf0
[ 7938.827926] [] ? perf_trace_lock+0x12a/0x160
[ 7938.834291] [] ? __sigqueue_alloc+0x5/0x150
[ 7938.840541] [] ? __sigqueue_alloc+0x134/0x150
[ 7938.847009] [] ? perf_trace_buf_prepare+0x98/0xf0
[ 7938.853835] [] ? __lock_task_sighand+0x6e/0x110
[ 7938.861174] [] perf_trace_lock+0x12a/0x160
[ 7938.867972] [] ? __lock_task_sighand+0x78/0x110
[ 7938.875256] [] ? do_send_sig_info+0x5d/0x80
[ 7938.882197] [] lock_release+0x130/0x260
[ 7938.888754] [] _raw_spin_unlock_irqrestore+0x24/0x40
[ 7938.896510] [] do_send_sig_info+0x5d/0x80
[ 7938.903240] [] send_sigio_to_task+0x12f/0x1a0
[ 7938.910365] [] ? send_sigio_to_task+0x5/0x1a0
[ 7938.917455] [] ? send_sigio+0x56/0x100
[ 7938.923894] [] send_sigio+0xae/0x100
[ 7938.930132] [] kill_fasync+0x97/0xf0
[ 7938.936359] [] ? kill_fasync+0xf/0xf0
[ 7938.942707] [] perf_event_wakeup+0xd4/0xf0
[ 7938.949522] [] ? perf_event_wakeup+0x5/0xf0
[ 7938.956367] [] perf_pending_event+0x33/0x60
[ 7938.963199] [] irq_work_run_list+0x4c/0x80
[ 7938.969932] [] irq_work_run+0x18/0x40
[ 7938.976212] [] smp_trace_irq_work_interrupt+0x3f/0xc0
[ 7938.983957] [] trace_irq_work_interrupt+0x6d/0x80
[ 7938.991362] [] ? _raw_spin_unlock+0x2b/0x40
[ 7938.998883] [] ? generic_exec_single+0x133/0x190
[ 7939.006127] [] ? task_clock_event_add+0x40/0x40
[ 7939.013297] [] smp_call_function_single+0x67/0xa0
[ 7939.020568] [] task_function_call+0x49/0x60
[ 7939.027277] [] ? perf_event_sched_in+0xa0/0xa0
[ 7939.034270] [] _perf_event_enable+0x90/0xf0
[ 7939.040963] [] ? task_function_call+0x60/0x60
[ 7939.047863] [] perf_event_for_each_child+0x3f/0xb0
[ 7939.055259] [] perf_event_task_enable+0x7c/0xd0
[ 7939.062321] [] SyS_prctl+0x26d/0x4d0
[ 7939.068359] [] system_call_fastpath+0x16/0x1b
[ 7939.075261] ---[ end trace 8e72f55d0f5cbae4 ]---
[ 7939.080732] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 585.271 msecs
[ 7939.090016] perf interrupt took too long (4572449 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
[ 7940.065563] INFO: rcu_sched detected stalls on CPUs/tasks: { 2} (detected by 3, t=5252 jiffies, g=10488, c=10487, q=196)
[ 7940.077820] Task dump for CPU 2:
[ 7940.081779] perf_fuzzer R running task 0 5692 2549 0x0000000c
[ 7940.089901] 00007ffff86e99b8 000000000000002b 0000000000000003 ffff8800a4103cd8
[ 7940.098442] ffffffff810b643f ffff88011897a4d0 0000000000000003 ffff88011897a4d0
[ 7940.106955] ffff8800ced65020 ffff8800a4103c98 ffffffff810b52b8 ffff8800a4103cb8
[ 7940.115473] Call Trace:
[ 7940.118593] [] ? __lock_acquire.isra.31+0x3af/0xfe0
[ 7940.126120] [] ? __lock_is_held+0x58/0x80
[ 7940.132660] [] ? perf_trace_buf_prepare+0x98/0xf0
[ 7940.139989] [] ? perf_trace_lock+0x12a/0x160
[ 7940.146848] [] ? __perf_event_enable+0x85/0x2a0
[ 7940.153971] [] ? _raw_spin_unlock+0x2b/0x40
[ 7940.160738] [] ? generic_exec_single+0x133/0x190
[ 7940.167964] [] ? task_clock_event_add+0x40/0x40
[ 7940.175029] [] ? smp_call_function_single+0x67/0xa0
[ 7940.182518] [] ? task_function_call+0x49/0x60
[ 7940.189447] [] ? perf_event_sched_in+0xa0/0xa0
[ 7940.196485] [] ? _perf_event_enable+0x90/0xf0
[ 7940.203430] [] ? task_function_call+0x60/0x60
[ 7940.210386] [] ? perf_event_for_each_child+0x3f/0xb0
[ 7940.217945] [] ? perf_event_task_enable+0x7c/0xd0
[ 7940.225255] [] ? SyS_prctl+0x26d/0x4d0
[ 7940.231557] [] ? system_call_fastpath+0x16/0x1b
[ 7947.852948] perf interrupt took too long (4536733 > 10000), lowering kernel.perf_event_max_sample_rate to 12500
[ 7956.620503] perf interrupt took too long (4501296 > 20000), lowering kernel.perf_event_max_sample_rate to 6250
[ 7965.387462] perf interrupt took too long (4466134 > 38461), lowering kernel.perf_event_max_sample_rate to 3250
-
[145965.719358] Call Trace:
[145965.722845] [] dump_stack+0x45/0x57
[145965.729907] [] warn_slowpath_common+0x8a/0xc0
[145965.737170] [] warn_slowpath_fmt+0x46/0x50
[145965.744103] [] ? native_sched_clock+0x2a/0x90
[145965.751356] [] watchdog_overflow_callback+0x92/0xc0
[145965.759125] [] __perf_event_overflow+0x91/0x270
[145965.766466] [] ? x86_perf_event_set_period+0xca/0x170
[145965.774393] [] perf_event_overflow+0x19/0x20
[145965.781478] [] intel_pmu_handle_irq+0x1ba/0x3a0
[145965.788793] [] ? trace_page_fault+0x30/0x30
[145965.795777] [] perf_event_nmi_handler+0x2b/0x50
[145965.803049] [] nmi_handle+0xa0/0x150
[145965.809335] [] ? nmi_handle+0x5/0x150
[145965.815730] [] default_do_nmi+0xd5/0x140
[145965.822428] [] do_nmi+0x98/0xe0
[145965.828254] [] end_repeat_nmi+0x1e/0x2e
[145965.834803] [] ? general_protection+0x30/0x30
[145965.841912] [] ? general_protection+0x30/0x30
[145965.849073] [] ? general_protection+0x30/0x30
[145965.856187] <> [] ? copy_user_handle_tail+0x3b/0x80
[145965.865154] [] copy_from_user_nmi+0x63/0x70
[145965.872114] [] perf_callchain_user+0xd0/0x240
[145965.879227] [] perf_callchain+0x1f8/0x220
[145965.885923] [] perf_prepare_sample+0x291/0x3c0
[145965.893151] [] __perf_event_overflow+0x10e/0x270
[145965.900562] [] ? __perf_event_overflow+0xd9/0x270
[145965.908078] [] ? lock_release+0x130/0x260
[145965.914842] [] perf_swevent_overflow+0xa9/0xe0
[145965.922072] [] perf_swevent_event+0x67/0x90
[145965.929025] [] perf_tp_event+0xc4/0x210
[145965.935615] [] ? lock_release+0x130/0x260
[145965.942395] [] ? __lock_task_sighand+0x6e/0x110
[145965.949648] [] ? perf_trace_lock+0x12a/0x160
[145965.956671] [] ? __lock_task_sighand+0x78/0x110
[145965.963919] [] ? do_send_sig_info+0x5d/0x80
[145965.970858] [] ? do_send_sig_info+0x5d/0x80
[145965.977849] [] ? perf_trace_buf_prepare+0x98/0xf0
[145965.985330] [] perf_trace_lock+0x12a/0x160
[145965.992195] [] ? send_sigio+0x56/0x100
[145965.998659] [] ? send_sigio+0xd0/0x100
[145966.005169] [] lock_release+0x130/0x260
[145966.011716] [] _raw_read_unlock+0x23/0x40
[145966.018442] [] send_sigio+0xd0/0x100
[145966.024700] [] kill_fasync+0x97/0xf0
[145966.030968] [] ? kill_fasync+0xf/0xf0
[145966.037365] [] perf_event_wakeup+0xd4/0xf0
[145966.044210] [] ? perf_event_wakeup+0x5/0xf0
[145966.051060] [] perf_pending_event+0x33/0x60
[145966.057950] [] irq_work_run_list+0x4c/0x80
[145966.064798] [] irq_work_run+0x18/0x40
[145966.071127] [] smp_trace_irq_work_interrupt+0x3f/0xc0
[145966.078929] [] trace_irq_work_interrupt+0x6d/0x80
[145966.086359] [] ? _raw_spin_unlock_irq+0x32/0x40
[145966.094337] [] ? _raw_spin_unlock_irq+0x2b/0x40
[145966.101634] [] finish_task_switch+0x8c/0x140
[145966.108630] [] ? finish_task_switch+0x4d/0x140
[145966.115793] [] __schedule+0x2d6/0x9f0
[145966.122115] [] ? perf_trace_lock+0x29/0x160
[145966.128909] [] schedule+0x37/0x90
[145966.134802] [] schedule_timeout+0x1bc/0x250
[145966.141578] [] ? wait_for_completion+0x28/0x100
[145966.148660] [] ? wait_for_completion+0xc4/0x100
[145966.155795] [] wait_for_completion+0xcc/0x100
[145966.162731] [] ? wake_up_state+0x20/0x20
[145966.169205] [] ? call_rcu_bh+0x20/0x20
[145966.175464] [] wait_rcu_gp+0x5d/0x80
[145966.181586] [] ? ftrace_raw_output_rcu_utilization+0x70/0x70
[145966.189890] [] synchronize_sched+0x3a/0x50
[145966.196573] [] perf_trace_event_unreg.isra.1+0x3b/0x90
[145966.204345] [] perf_trace_destroy+0x3c/0x50
[145966.211075] [] tp_perf_event_destroy+0xe/0x10
[145966.217976] [] __free_event+0x2c/0x80
[145966.224102] [] SYSC_perf_event_open+0x629/0xc80
[145966.231246] [] SyS_perf_event_open+0xe/0x10
[145966.237982] [] system_call_fastpath+0x16/0x1b
[145966.244932] ---[ end trace 7088940f25646d60 ]---