sudo pidstat -t -p 4063
Linux 4.4.0-124-generic (desktop)       05/08/2018      _i686_  (2 CPU)

09:43:39 PM   UID      TGID       TID    %usr %system  %guest    %CPU   CPU  
Command
09:43:39 PM  1000      4063         -    0.01    3.01    0.01    3.04     1  
qemu-system-i38
09:43:39 PM  1000         -      4063    0.02    0.00    0.00    0.02     1  
|__qemu-system-i38
09:43:39 PM  1000         -      4064    0.00    0.00    0.00    0.00     1  
|__qemu-system-i38
09:43:39 PM  1000         -      4066    0.00    3.01    0.01    3.02     0  
|__qemu-system-i38
09:43:39 PM  1000         -      4068    0.00    0.00    0.00    0.00     1  
|__qemu-system-i38


sudo perf stat -e 'kvm:*' -a sleep 1h
^Csleep: Interrupt

 Performance counter stats for 'system wide':

         4,221,248      kvm:kvm_entry                                           
      (100.00%)
                 0      kvm:kvm_hypercall                                       
      (100.00%)
                 0      kvm:kvm_hv_hypercall                                    
      (100.00%)
                 0      kvm:kvm_pio                                             
      (100.00%)
                 0      kvm:kvm_fast_mmio                                       
      (100.00%)
                 0      kvm:kvm_cpuid                                           
      (100.00%)
                 0      kvm:kvm_apic                                            
      (100.00%)
         4,222,925      kvm:kvm_exit                                            
      (100.00%)
                 0      kvm:kvm_inj_virq                                        
      (100.00%)
                 0      kvm:kvm_inj_exception                                   
      (100.00%)
                 0      kvm:kvm_page_fault                                      
      (100.00%)
                 0      kvm:kvm_msr                                             
      (100.00%)
                 0      kvm:kvm_cr                                              
      (100.00%)
                 0      kvm:kvm_pic_set_irq                                     
      (100.00%)
                 0      kvm:kvm_apic_ipi                                        
      (100.00%)
                 0      kvm:kvm_apic_accept_irq                                 
      (100.00%)
                 0      kvm:kvm_eoi                                             
      (100.00%)
                 0      kvm:kvm_pv_eoi                                          
      (100.00%)
                 0      kvm:kvm_nested_vmrun                                    
      (100.00%)
                 0      kvm:kvm_nested_intercepts                               
      (100.00%)
                 0      kvm:kvm_nested_vmexit                                   
      (100.00%)
                 0      kvm:kvm_nested_vmexit_inject                            
         (100.00%)
                 0      kvm:kvm_nested_intr_vmexit                              
       (100.00%)
                 0      kvm:kvm_invlpga                                         
      (100.00%)
                 0      kvm:kvm_skinit                                          
      (100.00%)
       169,094,024      kvm:kvm_emulate_insn                                    
      (100.00%)
                 0      kvm:vcpu_match_mmio                                     
      (100.00%)
                 0      kvm:kvm_write_tsc_offset                                
      (100.00%)
                 0      kvm:kvm_pml_full                                        
      (100.00%)
                 0      kvm:kvm_ple_window                                      
      (100.00%)
                 0      kvm:kvm_pvclock_update                                  
      (100.00%)
                 0      kvm:kvm_wait_lapic_expire                               
      (100.00%)
                 0      kvm:kvm_enter_smm                                       
      (100.00%)
                 0      kvm:kvm_pi_irte_update                                  
      (100.00%)
                 0      kvm:kvm_userspace_exit                                  
      (100.00%)
                 0      kvm:kvm_vcpu_wakeup                                     
      (100.00%)
                 0      kvm:kvm_set_irq                                         
      (100.00%)
                 0      kvm:kvm_ioapic_set_irq                                  
      (100.00%)
                 0      kvm:kvm_ioapic_delayed_eoi_inj                          
           (100.00%)
                 0      kvm:kvm_msi_set_irq                                     
      (100.00%)
                 0      kvm:kvm_ack_irq                                         
      (100.00%)
                 0      kvm:kvm_mmio                                            
      (100.00%)
                 0      kvm:kvm_fpu                                             
      (100.00%)
                 0      kvm:kvm_age_page                                        
      (100.00%)
                 0      kvm:kvm_try_async_get_page                              
       (100.00%)
                 0      kvm:kvm_async_pf_doublefault                            
         (100.00%)
                 0      kvm:kvm_async_pf_not_present                            
         (100.00%)
                 0      kvm:kvm_async_pf_ready                                  
      (100.00%)
                 0      kvm:kvm_async_pf_completed                              
       (100.00%)
                 0      kvm:kvm_halt_poll_ns                                    
    

     258.400486070 seconds time elapsed

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https://bugs.launchpad.net/bugs/1767857

Title:
  Kernel 4.4.0-122 Breaks qemu-system-x86

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