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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1767857 Title: Kernel 4.4.0-122 Breaks qemu-system-x86 Status in linux package in Ubuntu: Confirmed Status in qemu package in Ubuntu: Incomplete Bug description: Fully updated xubuntu 16.04 running kernel 4.4.0-122 breaks qemu- system-x86: black screen displays and qemu-system-x86 runs at 100% cpu indefinitely. Boot the same system with kernel 4.4.0-119 and qemu- system-x86 works fine running a Windows 10 VM. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: qemu-system-x86 1:2.5+dfsg-5ubuntu10.25 ProcVersionSignature: Ubuntu 4.4.0-122.146-generic 4.4.117 Uname: Linux 4.4.0-122-generic i686 ApportVersion: 2.20.1-0ubuntu2.16 Architecture: i386 CurrentDesktop: XFCE Date: Sun Apr 29 15:58:25 2018 InstallationDate: Installed on 2014-04-29 (1460 days ago) InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140416.2) KvmCmdLine: COMMAND STAT EUID RUID PID PPID %CPU COMMAND kvm-irqfd-clean S< 0 0 394 2 0.0 [kvm-irqfd-clean] MachineType: Dell Inc. Inspiron 518 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-122-generic root=UUID=7cffb293-c044-4b2c-8343-dc50fd16db97 ro --verbose nosplash nmi_watchdog=0 SourcePackage: qemu UpgradeStatus: Upgraded to xenial on 2016-08-10 (627 days ago) dmi.bios.date: 03/30/2009 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.0.8 dmi.board.name: 0K068D dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 3 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: OEM dmi.modalias: dmi:bvnDellInc.:bvr1.0.8:bd03/30/2009:svnDellInc.:pnInspiron518:pvr00:rvnDellInc.:rn0K068D:rvrA00:cvnDellInc.:ct3:cvrOEM: dmi.product.name: Inspiron 518 dmi.product.version: 00 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1767857/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp