WARNING: at arch/x86/kernel/hw_breakpoint.c:119 Can't find any breakpoint slot

Severity

Mild. WARN_ON_ONCE. Does not seem to affect system stability.

Fixed by

9fc81d87420d0d3fd62d5e5529972c0ad9eab9cc perf: Fix events installation during moving group

Found by

perf_fuzzer

Reproducible

yes

Seen On

Haswell, AMD A10, Core2

First Seen

3.14-rc5. Might have appeared earlier, did not attempt bisection.

Most Recently Seen

3.19-rc1
3.17-rc7
3.17-rc4
3.15-rc4
3.14-rc6. Hard to reproduce. Reproducible from seed, but enabling logging or ftrace makes it not happen (possibly is a context-switch on fork bug).

Reported to Mailing List

Possibly earlier, 8b4d801b2b123b6c09742f861fe44a8527b84d47 in 3.10 claims to fix this bug but it seems it can be triggered in other ways

3 March 2014: https://lkml.org/lkml/2014/3/3/337

Kernel Spews

  1. *** perf_fuzzer 0.29-pre *** by Vince Weaver
    
            Linux version 3.17.0-rc7+ x86_64
            Processor: Intel 6/23/10
    
            Seeding random number generator with 1412173833
            /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 -t OCIRMQWPFpAi -s 50000 -r 1412173833
    
    Pid=3333, 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:
            busy-instruction-loop accessing-perf-proc-and-sys-files trashing-the-mmap-page 
    *NOT* attempting the following:
            signal-handler-on-overflow 
    ==================================================
    Iteration 10000
            Open attempts: 221780  Successful: 886
                    EPERM : 35
                    ENOENT : 1858
                    E2BIG : 24155
                    EBADF : 9031
                    EACCES : 409
                    EINVAL : 184306
                    EOPNOTSUPP : 1100
                    Type (Hardware 175/29215)(software 373/34941)(tracepoint 102/35022)(Cache 34/27896)(cpu 180/34743)(breakpoint 22/34764)(#6 0/26)(#7 0/34)(#8 0/124)(#9 0/23)(#10 0/32)(#11 0/20)(#12 0/20)(#13 0/30)(#14 0/24)(>14 0/24866)
            Close attempts: 844  Successful: 844
            Read attempts: 848  Successful: 751
            Write attempts: 890  Successful: 0
            Ioctl attempts: 842  Successful: 374
            Mmap attempts: 886  Successful: 333
            Prctl attempts: 875  Successful: 875
            Fork attempts: 441  Successful: 441
            Poll attempts: 934  Successful: 0
            Access attempts: 927  Successful: 438
            Trash mmap attempts: 857  Successful: 857
            Overflows: 0
            SIGIOs due to RT signal queue full: 0
    Iteration 20000
            Open attempts: 222509  Successful: 945
                    EPERM : 40
                    ENOENT : 2027
                    E2BIG : 24156
                    EBADF : 8097
                    EACCES : 410
                    EINVAL : 185664
                    ENOSPC : 18
                    EOPNOTSUPP : 1152
                    Type (Hardware 182/29267)(software 380/35184)(tracepoint 109/35351)(Cache 52/27651)(cpu 189/34833)(breakpoint 33/34656)(#6 0/34)(#7 0/27)(#8 0/127)(#9 0/33)(#10 0/33)(#11 0/21)(#12 0/31)(#13 0/20)(#14 0/35)(>14 0/25206)
            Close attempts: 899  Successful: 899
            Read attempts: 911  Successful: 785
            Write attempts: 889  Successful: 0
            Ioctl attempts: 919  Successful: 392
            Mmap attempts: 945  Successful: 271
            Prctl attempts: 865  Successful: 865
            Fork attempts: 439  Successful: 439
            Poll attempts: 939  Successful: 9
            Access attempts: 940  Successful: 459
            Trash mmap attempts: 927  Successful: 927
            Overflows: 0
            SIGIOs due to RT signal queue full: 0
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Fork failed! Invalid argument
    Iteration 30000
            Open attempts: 211834  Successful: 938
                    EPERM : 34
                    ENOENT : 1904
                    E2BIG : 23287
                    EBADF : 7217
                    EACCES : 443
                    EINVAL : 176791
                    ENOSPC : 119
                    EOPNOTSUPP : 1101
                    Type (Hardware 205/28035)(software 377/33597)(tracepoint 95/33186)(Cache 56/26343)(cpu 188/33172)(breakpoint 17/33083)(#6 0/39)(#7 0/19)(#8 0/93)(#9 0/41)(#10 0/36)(#11 0/21)(#12 0/28)(#13 0/23)(#14 0/21)(>14 0/24097)
            Close attempts: 891  Successful: 891
            Read attempts: 864  Successful: 739
            Write attempts: 931  Successful: 0
            Ioctl attempts: 948  Successful: 427
            Mmap attempts: 938  Successful: 240
            Prctl attempts: 885  Successful: 885
            Fork attempts: 462  Successful: 440
            Poll attempts: 900  Successful: 18
            Access attempts: 956  Successful: 461
            Trash mmap attempts: 892  Successful: 892
            Overflows: 0
            SIGIOs due to RT signal queue full: 0
    [71414.328057] ------------[ cut here ]------------
    [71414.332002] WARNING: CPU: 1 PID: 3333 at arch/x86/kernel/hw_breakpoint.c:119 arch_install_hw_breakpoint+0xbe/0xcd()
    [71414.332002] Can't find any breakpoint slot
    [71414.332002] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative f71882fg evdev mcs7830 usbnet coretemp psmouse serio_raw pcspkr video wmi ohci_pci ohci_hcd i2c_nforce2 button acpi_cpufreq processor thermal_sys sg ehci_pci ehci_hcd sd_mod usbcore usb_common
    [71414.332002] CPU: 1 PID: 3333 Comm: perf_fuzzer Not tainted 3.17.0-rc7+ #84
    [71414.332002] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015  10/19/2012
    [71414.332002]  0000000000000000 ffff8800c959fa18 ffffffff8151e17e ffff8800c959fa60
    [71414.332002]  ffff8800c959fa50 ffffffff8103ee43 ffffffff810092f0 ffff8800c97e8800
    [71414.332002]  ffff8800cb8ff300 000040ec17749451 ffff88011fc95668 ffff8800c959fab0
    [71414.332002] Call Trace:
    [71414.332002]  [] dump_stack+0x45/0x56
    [71414.332002]  [] warn_slowpath_common+0x7f/0x98
    [71414.332002]  [] ? arch_install_hw_breakpoint+0xbe/0xcd
    [71414.332002]  [] warn_slowpath_fmt+0x4c/0x4e
    [71414.332002]  [] ? sched_clock_cpu+0x91/0xa2
    [71414.332002]  [] arch_install_hw_breakpoint+0xbe/0xcd
    [71414.332002]  [] hw_breakpoint_add+0x45/0x48
    [71414.332002]  [] event_sched_in+0x8a/0x12c
    [71414.332002]  [] group_sched_in+0x51/0x141
    [71414.332002]  [] ctx_sched_in.isra.71+0x121/0x142
    [71414.332002]  [] perf_event_sched_in.isra.74+0x59/0x5e
    [71414.332002]  [] perf_event_context_sched_in.isra.75+0x6a/0x90
    [71414.332002]  [] __perf_event_task_sched_in+0x37/0xf4
    [71414.332002]  [] finish_task_switch+0x9b/0xa6
    [71414.332002]  [] __schedule+0x309/0x4a5
    [71414.332002]  [] schedule+0x6e/0x70
    [71414.332002]  [] schedule_timeout+0x29/0x104
    [71414.332002]  [] ? pcpu_alloc_area+0x1d2/0x206
    [71414.332002]  [] ? update_group_times+0x18/0x40
    [71414.332002]  [] ? allocate_probes+0x18/0x2a
    [71414.332002]  [] do_wait_for_common+0xe5/0x118
    [71414.332002]  [] ? console_conditional_schedule+0x19/0x19
    [71414.332002]  [] ? wake_up_state+0x12/0x12
    [71414.332002]  [] wait_for_common+0x3a/0x47
    [71414.332002]  [] ? call_rcu_bh+0x19/0x19
    [71414.332002]  [] wait_for_completion+0x1d/0x1f
    [71414.332002]  [] wait_rcu_gp+0x4b/0x51
    [71414.332002]  [] ? ftrace_raw_output_rcu_utilization+0x44/0x44
    [71414.332002]  [] synchronize_sched+0x40/0x42
    [71414.332002]  [] perf_trace_event_unreg.isra.1+0x37/0x78
    [71414.332002]  [] perf_trace_destroy+0x36/0x45
    [71414.332002]  [] tp_perf_event_destroy+0xe/0x10
    [71414.332002]  [] __free_event+0x36/0x6f
    [71414.332002]  [] SYSC_perf_event_open+0x3f9/0x7f5
    [71414.332002]  [] SyS_perf_event_open+0xe/0x10
    [71414.332002]  [] system_call_fastpath+0x1a/0x1f
    [71414.332002] ---[ end trace 2a54cc1c63c6587a ]---
    
  2. *** perf_fuzzer 0.29-pre *** by Vince Weaver
    
            Linux version 3.17.0-rc4+ x86_64
            Processor: Intel 6/23/10
    
            Seeding random number generator with 1410195697
            /proc/sys/kernel/perf_event_max_sample_rate currently: 25000/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 -t OCIRMQWPFpAi -s 50000 -r 1410195697
    
    Pid=9930, sleeping 1s
    ==================================================
    [  935.584074] ------------[ cut here ]------------
    [  935.588013] WARNING: CPU: 1 PID: 9930 at arch/x86/kernel/hw_breakpoint.c:119 arch_install_hw_breakpoint+0x6b/0xf8()
    [  935.588013] Can't find any breakpoint slot
    [  935.588013] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative f71882fg mcs7830 usbnet evdev psmouse coretemp serio_raw pcspkr ohci_pci ohci_hcd video wmi button i2c_nforce2 acpi_cpufreq processor thermal_sys sg sd_mod ehci_pci ehci_hcd usbcore usb_common
    [  935.588013] CPU: 1 PID: 9930 Comm: perf_fuzzer Not tainted 3.17.0-rc4+ #67
    [  935.588013] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015  10/19/2012
    [  935.588013]  0000000000000077 ffff8800c5233948 ffffffff81552b82 0000000000000077
    [  935.588013]  ffff8800c5233998 ffff8800c5233988 ffffffff8104365f 0000000000013380
    [  935.588013]  ffffffff81009e76 0000000000000004 ffff880119c0d800 ffff8800cba1c200
    [  935.588013] Call Trace:
    [  935.588013]  [] dump_stack+0x49/0x5f
    [  935.588013]  [] warn_slowpath_common+0x81/0x9b
    [  935.588013]  [] ? arch_install_hw_breakpoint+0x6b/0xf8
    [  935.588013]  [] warn_slowpath_fmt+0x46/0x48
    [  935.588013]  [] arch_install_hw_breakpoint+0x6b/0xf8
    [  935.588013]  [] hw_breakpoint_add+0x49/0x4d
    [  935.588013]  [] event_sched_in+0x91/0x132
    [  935.588013]  [] group_sched_in+0x4e/0x148
    [  935.588013]  [] ctx_sched_in+0x163/0x18a
    [  935.588013]  [] perf_event_sched_in+0x6e/0x77
    [  935.588013]  [] perf_event_context_sched_in+0x76/0xa0
    [  935.588013]  [] __perf_event_task_sched_in+0x3f/0x110
    [  935.588013]  [] finish_task_switch+0x46/0xad
    [  935.588013]  [] __schedule+0x454/0x4a8
    [  935.588013]  [] schedule+0x6e/0x70
    [  935.588013]  [] schedule_timeout+0x27/0xc2
    [  935.588013]  [] ? __kmalloc+0xdb/0xed
    [  935.588013]  [] ? allocate_probes+0x18/0x2a
    [  935.588013]  [] ? perf_trace_signal_generate+0x137/0x137
    [  935.588013]  [] ? console_conditional_schedule+0x19/0x19
    [  935.588013]  [] __wait_for_common+0xc6/0x142
    [  935.588013]  [] ? try_to_wake_up+0x1f6/0x1f6
    [  935.588013]  [] ? perf_trace_signal_generate+0x137/0x137
    [  935.588013]  [] ? T.961+0x1e0/0x1e0
    [  935.588013]  [] wait_for_completion+0x24/0x26
    [  935.588013]  [] wait_rcu_gp+0x4b/0x54
    [  935.588013]  [] ? wait_rcu_gp+0x54/0x54
    [  935.588013]  [] synchronize_sched+0x2e/0x30
    [  935.588013]  [] perf_trace_event_unreg+0x36/0xc2
    [  935.588013]  [] perf_trace_destroy+0x36/0x46
    [  935.588013]  [] tp_perf_event_destroy+0xe/0x10
    [  935.588013]  [] __free_event+0x3a/0x75
    [  935.588013]  [] SYSC_perf_event_open+0x404/0x870
    [  935.588013]  [] SyS_perf_event_open+0xe/0x10
    [  935.588013]  [] tracesys+0xd4/0xd9
    [  935.588013] ---[ end trace 56dd46009c10d7e1 ]---
    
  3. *** perf_fuzzer 0.28 *** by Vince Weaver                                        
                                                                                    
            Linux version 3.15.0-rc1+ x86_64                                        
            Processor: Intel 6/60/3                                                 
                                                                                    
            Seeding random number generator with 1398194843                         
            /proc/sys/kernel/perf_event_max_sample_rate currently: 12500/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 -t OCIRMQWPFpAi -s 50000 -r 1398194843 
                                                                                    
    Pid=4819, 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:                                                  
            busy-instruction-loop accessing-perf-proc-and-sys-files trashing-the-mma
    p-page                                                                          
    *NOT* attempting the following:                                                 
            signal-handler-on-overflow                                              
    ==================================================                              
    Iteration 10000                                                                 
            Open attempts: 348324  Successful: 912                                  
                    EPERM : 22                                                      
                    ENOENT : 940                                                    
                    E2BIG : 40398                                                   
                    EBADF : 5838                                                    
                    EACCES : 275                                                    
                    EINVAL : 299029                                                 
                    ENOSPC : 187                                                    
                    EOPNOTSUPP : 723                                                
            Close attempts: 886  Successful: 886                                    
            Read attempts: 850  Successful: 734                                     
            Write attempts: 927  Successful: 0                                      
            Ioctl attempts: 909  Successful: 430                                    
            Mmap attempts: 912  Successful: 246                                     
            Prctl attempts: 921  Successful: 921                                    
            Fork attempts: 451  Successful: 451                                     
            Poll attempts: 867  Successful: 8                                       
            Access attempts: 873  Successful: 448                                   
            Trash mmap attempts: 837  Successful: 837                               
            Overflows: 0                                                            
            SIGIOs due to RT signal queue full: 0                                   
    [  438.849695] ------------[ cut here ]------------                             
    [  438.854589] WARNING: CPU: 3 PID: 4819 at arch/x86/kernel/hw_breakpoint.c:120 
    arch_install_hw_breakpoint+0xf1/0x100()                                         
    [  438.865872] Can't find any breakpoint slot                                   
    [  438.870021] Modules linked in: fuse snd_hda_codec_realtek snd_hda_codec_hdmi 
    snd_hda_codec_generic x86_pkg_temp_thermal intel_powerclamp coretemp kvm snd_hda
    _intel i915 crct10dif_pclmul snd_hda_controller crc32_pclmul snd_hda_codec snd_h
    wdep ghash_clmulni_intel snd_pcm aesni_intel iTCO_wdt drm_kms_helper snd_seq drm
     parport_pc aes_x86_64 lrw evdev gf128mul psmouse snd_timer glue_helper snd_seq_
    device i2c_i801 i2c_algo_bit iTCO_vendor_support ablk_helper parport serio_raw p
    cspkr i2c_core lpc_ich snd tpm_tis cryptd soundcore mfd_core mei_me wmi mei proc
    essor video battery tpm button sg sd_mod sr_mod crc_t10dif crct10dif_common cdro
    m ahci e1000e libahci ehci_pci libata ptp ehci_hcd xhci_hcd crc32c_intel pps_cor
    e scsi_mod usbcore usb_common thermal fan thermal_sys                           
    [  438.944269] CPU: 3 PID: 4819 Comm: perf_fuzzer Not tainted 3.15.0-rc1+ #85   
    [  438.951634] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2
    014                                                                             
    [  438.959552]  0000000000000009 ffff8800cf21bc20 ffffffff8164f7b3 ffff8800cf21b
    c68                                                                             
    [  438.967590]  ffff8800cf21bc58 ffffffff810647cd 0000000000000004 ffff880118799
    000                                                                             
    [  438.975619]  ffff88011ead7f20 ffff88011ead7f24 00000061b10c77c1 ffff8800cf21b
    cb8                                                                             
    [  438.983681] Call Trace:                                                      
    [  438.986309]  [] dump_stack+0x45/0x56                       
    [  438.991835]  [] warn_slowpath_common+0x7d/0xa0             
    [  438.998271]  [] warn_slowpath_fmt+0x4c/0x50                
    [  439.004484]  [] arch_install_hw_breakpoint+0xf1/0x100      
    [  439.011600]  [] hw_breakpoint_add+0x44/0x50                
    [  439.017767]  [] event_sched_in.isra.76+0x90/0x1e0          
    [  439.024479]  [] group_sched_in+0x69/0x1e0                  
    [  439.030471]  [] __perf_event_enable+0x255/0x260            
    [  439.037001]  [] remote_function+0x40/0x50                  
    [  439.042994]  [] generic_exec_single+0x126/0x170            
    [  439.049566]  [] ? task_clock_event_add+0x40/0x40           
    [  439.056217]  [] smp_call_function_single+0x67/0xa0         
    [  439.063056]  [] task_function_call+0x44/0x50               
    [  439.069343]  [] ? perf_event_sched_in+0x90/0x90            
    [  439.075802]  [] perf_event_enable+0x90/0xf0                
    [  439.081965]  [] ? task_function_call+0x50/0x50             
    [  439.088379]  [] perf_event_for_each_child+0x3a/0xa0        
    [  439.095283]  [] perf_event_task_enable+0x4f/0x80           
    [  439.101918]  [] SyS_prctl+0x255/0x4b0                      
    [  439.107480]  [] tracesys+0xe1/0xe6                         
    [  439.112785] ---[ end trace eea548b4adf51169 ]---                             
    
  4. *** perf_fuzzer *** by Vince Weaver
    
    Seeding random number generator with 1394477379
    Kernel max sample rate currently: 12500/s
    ==================================================
    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:
            
    ==================================================
    [  970.283167] ------------[ cut here ]------------
    [  970.287093] WARNING: CPU: 1 PID: 25860 at arch/x86/kernel/hw_breakpoint.c:120
     arch_install_hw_breakpoint+0x6b/0xf8()
    [  970.287093] Can't find any breakpoint slot
    [  970.287093] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powers
    ave cpufreq_conservative f71882fg mcs7830 usbnet evdev ohci_pci i2c_nforce2 ohci
    _hcd coretemp psmouse serio_raw pcspkr video wmi button acpi_cpufreq processor thermal_sys ehci_pci ehci_hcd sg sd_mod usbcore usb_common
    [  970.287093] CPU: 1 PID: 25860 Comm: perf_fuzzer Not tainted 3.14.0-rc6+ #38
    [  970.287093] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015  10/19/2012
    [  970.287093]  0000000000000078 ffff88003780dbd8 ffffffff81531e73 0000000000000078
    [  970.287093]  ffff88003780dc28 ffff88003780dc18 ffffffff8103fce4 dead000000000000
    [  970.287093]  ffffffff81008e38 0000000000000004 ffff88011a98f800 ffff88011afb9640
    [  970.287093] Call Trace:
    [  970.287093]  [] dump_stack+0x49/0x5e
    [  970.287093]  [] warn_slowpath_common+0x81/0x9b
    [  970.287093]  [] ? arch_install_hw_breakpoint+0x6b/0xf8
    [  970.287093]  [] warn_slowpath_fmt+0x46/0x48
    [  970.287093]  [] ? __hrtimer_start_range_ns+0x2ed/0x2ff
    [  970.287093]  [] arch_install_hw_breakpoint+0x6b/0xf8
    [  970.287093]  [] hw_breakpoint_add+0x49/0x4d
    [  970.287093]  [] event_sched_in+0x8c/0x12d
    [  970.287093]  [] group_sched_in+0x4a/0x147
    [  970.287093]  [] ? sched_clock_cpu+0x8e/0xaa
    [  970.287093]  [] __perf_event_enable+0x117/0x172
    [  970.287093]  [] ? perf_event_task_output+0x13d/0x13d
    [  970.287093]  [] remote_function+0x3c/0x43
    [  970.287093]  [] ? __pollwait+0xcc/0xcc
    [  970.287093]  [] smp_call_function_single+0x8a/0x101
    [  970.287093]  [] task_function_call+0x44/0x4e
    [  970.287093]  [] ? __perf_event_task_sched_in+0x10e/0x10e
    [  970.287093]  [] perf_event_enable+0x112/0x150
    [  970.287093]  [] ? perf_install_in_context+0xbc/0xbc
    [  970.287093]  [] perf_event_for_each_child+0x58/0x8b
    [  970.287093]  [] perf_event_task_enable+0x4b/0x7d
    [  970.287093]  [] SyS_prctl+0x148/0x324
    [  970.287093]  [] ? SyS_poll+0x53/0xbc
    [  970.287093]  [] system_call_fastpath+0x1a/0x1f
    [  970.287093] ---[ end trace 89b69112a777e6fe ]---
    Iteration 10000
            Open attempts: 359203  Successful: 928
                    EPERM : 18
                    ENOENT : 931
                    E2BIG : 38838
                    EBADF : 5473
                    EINVAL : 312389
                    ENOSPC : 81
                    EOPNOTSUPP : 545
            Close attempts: 879  Successful: 879
            Read attempts: 846  Successful: 713
            Write attempts: 840  Successful: 0
            Ioctl attempts: 882  Successful: 298
            Mmap attempts: 928  Successful: 217
            Prctl attempts: 879  Successful: 879
            Fork attempts: 442  Successful: 442
            Poll attempts: 933  Successful: 7
            Access attempts: 907  Successful: 446
            Trash mmap attempts: 857  Successful: 857
            Overflows: 3
            SIGIOs due to RT signal queue full: 0
    
  5. Seed = 1393871713 Info = Unknown?
  6. Seed = 1393877577 after 20 k Info = Unknown?
    [ 3699.991005] ------------[ cut here ]------------
    [ 3699.992018] WARNING: CPU: 1 PID: 31332 at arch/x86/kernel/hw_breakpoint.c:120 arch_install_hw_breakpoint+0x6b/0xf8()
    [ 3699.992018] Can't find any breakpoint slot
    [ 3699.992018] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative f71882fg acpi_cpufreq evdev mcs7830 usbnet coretemp psmouse serio_raw pcspkr video wmi processor button thermal_sys ohci_pci ohci_hcd i2c_nforce2 sg ehci_pci ehci_hcd sd_mod usbcore usb_common
    [ 3699.992018] CPU: 1 PID: 31332 Comm: perf_fuzzer Not tainted 3.14.0-rc5 #32
    [ 3699.992018] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015  10/19/2012
    [ 3699.992018]  0000000000000078 ffff8800b1c2dbd8 ffffffff81531e61 0000000000000078
    [ 3699.992018]  ffff8800b1c2dc28 ffff8800b1c2dc18 ffffffff8103fce4 ffff8800b1c2dbf8
    [ 3699.992018]  ffffffff81008e38 0000000000000004 ffff880082d4f800 ffff880037f048c0
    [ 3699.992018] Call Trace:
    [ 3699.992018]  [] dump_stack+0x49/0x60
    [ 3699.992018]  [] warn_slowpath_common+0x81/0x9b
    [ 3699.992018]  [] ? arch_install_hw_breakpoint+0x6b/0xf8
    [ 3699.992018]  [] warn_slowpath_fmt+0x46/0x48
    [ 3699.992018]  [] arch_install_hw_breakpoint+0x6b/0xf8
    [ 3699.992018]  [] hw_breakpoint_add+0x49/0x4d
    [ 3699.992018]  [] event_sched_in+0x8c/0x12d
    [ 3699.992018]  [] group_sched_in+0x4a/0x147
    [ 3699.992018]  [] ? sched_clock_cpu+0x8e/0xaa
    [ 3699.992018]  [] __perf_event_enable+0x117/0x172
    [ 3699.992018]  [] ? perf_event_task_output+0x13d/0x13d
    [ 3699.992018]  [] remote_function+0x3c/0x43
    [ 3699.992018]  [] smp_call_function_single+0x8a/0x101
    [ 3699.992018]  [] task_function_call+0x44/0x4e
    [ 3699.992018]  [] ? __perf_event_task_sched_in+0x10e/0x10e
    [ 3699.992018]  [] perf_event_enable+0x112/0x150
    [ 3699.992018]  [] ? perf_install_in_context+0xbc/0xbc
    [ 3699.992018]  [] perf_event_for_each_child+0x58/0x8b
    [ 3699.992018]  [] perf_event_task_enable+0x4b/0x7d
    [ 3699.992018]  [] SyS_prctl+0x148/0x324
    [ 3699.992018]  [] system_call_fastpath+0x1a/0x1f
    [ 3699.992018] ---[ end trace 680f8979aa2ba0db ]---
    
  7. Seeding random number generator with 1394468495 Kernel max sample rate currently: 6250/s
    [  254.035079] WARNING: CPU: 1 PID: 10941 at arch/x86/kernel/hw_breakpoint.c:120 arch_install_hw_breakpoint+0x6b/0xf8()
    [  254.035079] Can't find any breakpoint slot
    [  254.035079] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative f71882fg ohci_pci mcs7830 acpi_cpufreq usbnet evdev coretemp wmi video psmouse serio_raw processor thermal_sys button pcspkr ohci_hcd i2c_nforce2 sg ehci_pci ehci_hcd sd_mod usbcore usb_common
    [  254.035079] CPU: 1 PID: 10941 Comm: perf_fuzzer Not tainted 3.14.0-rc6 #36
    [  254.035079] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015  10/19/2012
    [  254.035079]  0000000000000078 ffff8800c9f65bd8 ffffffff81531e73 0000000000000078
    [  254.035079]  ffff8800c9f65c28 ffff8800c9f65c18 ffffffff8103fce4 dead000000000020
    [  254.035079]  ffffffff81008e38 0000000000000004 ffff880119457000 ffff8801196f58c0
    [  254.035079] Call Trace:
    [  254.035079]  [] dump_stack+0x49/0x5e
    [  254.035079]  [] warn_slowpath_common+0x81/0x9b
    [  254.035079]  [] ? arch_install_hw_breakpoint+0x6b/0xf8
    [  254.035079]  [] warn_slowpath_fmt+0x46/0x48
    [  254.035079]  [] arch_install_hw_breakpoint+0x6b/0xf8
    [  254.035079]  [] hw_breakpoint_add+0x49/0x4d
    [  254.035079]  [] event_sched_in+0x8c/0x12d
    [  254.035079]  [] group_sched_in+0x4a/0x147
    [  254.035079]  [] ? sched_clock_cpu+0x8e/0xaa
    [  254.035079]  [] __perf_event_enable+0x117/0x172
    [  254.035079]  [] ? perf_event_task_output+0x13d/0x13d
    [  254.035079]  [] remote_function+0x3c/0x43
    [  254.035079]  [] ? __pollwait+0xcc/0xcc
    [  254.035079]  [] smp_call_function_single+0x8a/0x101
    [  254.035079]  [] task_function_call+0x44/0x4e
    [  254.035079]  [] ? __perf_event_task_sched_in+0x10e/0x10e
    [  254.035079]  [] perf_event_enable+0x112/0x150
    [  254.035079]  [] ? perf_install_in_context+0xbc/0xbc
    [  254.035079]  [] perf_event_for_each_child+0x58/0x8b
    [  254.035079]  [] perf_event_task_enable+0x4b/0x7d
    [  254.035079]  [] SyS_prctl+0x148/0x324
    [  254.035079]  [] tracesys+0xd4/0xd9
    [  254.035079] ---[ end trace 65e2004e88e24fea ]---
    

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