`perf top` output on 4.15.0-20-generic 13,09% [kernel] [k] acpi_os_read_port 11,81% [kernel] [k] acpi_ns_search_one_scope 6,42% [kernel] [k] acpi_os_write_port 4,62% [kernel] [k] acpi_ut_track_stack_ptr 4,17% [kernel] [k] acpi_ut_trace_ptr 3,42% [kernel] [k] strncpy 3,28% [kernel] [k] __tick_nohz_idle_enter 2,49% [kernel] [k] acpi_ut_status_exit 1,63% [kernel] [k] acpi_ex_resolve_node_to_value 1,50% [kernel] [k] nmi 1,34% libapt-pkg.so.5.0.2 [.] lroundf@plt 1,31% [kernel] [k] acpi_ut_update_ref_count.part.1 1,28% [kernel] [k] acpi_ex_resolve_operands 1,25% [kernel] [k] acpi_ut_add_reference 1,23% [kernel] [k] acpi_ut_acquire_mutex 1,19% libapt-pkg.so.5.0.2 [.] _ZNK8pkgCache11DepIterator10IsNegativeEv 1,18% [kernel] [k] acpi_ns_evaluate 1,12% [kernel] [k] acpi_ut_trace 1,00% libstdc++.so.6.0.25 [.] _ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE9_M_createERmm 0,97% [kernel] [k] _find_next_bit 0,92% [kernel] [k] kmem_cache_alloc 0,82% [kernel] [k] rcu_note_context_switch 0,71% [kernel] [k] menu_select 0,67% [kernel] [k] __kmalloc 0,64% [kernel] [k] acpi_ut_valid_internal_object 0,62% [kernel] [k] acpi_ut_update_object_reference 0,57% [kernel] [k] kfree 0,57% libapt-pkg.so.5.0.2 [.] _Z13stringcasecmpN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEES9_S2_S2_ 0,51% libapt-pkg.so.5.0.2 [.] _ZN6FileFd5WriteEPKvy 0,49% [kernel] [k] kmem_cache_free 0,48% [kernel] [k] acpi_ns_lookup 0,48% python3.6 [.] 0x0000000000184852 0,47% [kernel] [k] acpi_hw_validate_io_request 0,45% [kernel] [k] acpi_ut_match_predefined_method 0,42% [kernel] [k] prefetch_freepointer 0,39% [kernel] [k] acpi_ps_get_next_arg 0,39% [kernel] [k] acpi_ut_get_next_predefined_method 0,35% [kernel] [k] acpi_ds_exec_begin_op 0,35% [kernel] [k] acpi_ps_create_op 0,33% [kernel] [k] acpi_ps_get_opcode_info 0,33% [kernel] [k] acpi_ps_parse_loop 0,32% [kernel] [k] acpi_ut_repair_name 0,31% [kernel] [k] acpi_ex_read_data_from_field 0,31% [kernel] [k] acpi_ns_build_normalized_path 0,30% [kernel] [k] acpi_ds_delete_result_if_not_used 0,30% [kernel] [k] acpi_ds_create_operand 0,28% [kernel] [k] acpi_ds_exec_end_op 0,28% [kernel] [k] __schedule 0,27% [kernel] [k] acpi_ds_evaluate_name_path 0,26% libc-2.27.so [.] __GI___strlen_sse2 0,26% [kernel] [k] acpi_ex_name_segment 0,25% [kernel] [k] memset_erms 0,25% python3.6 [.] 0x00000000000436c0 0,24% [kernel] [k] acpi_ns_search_and_enter 0,24% python3.6 [.] 0x0000000000043710
-- 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/1087010 Title: kworker uses 70-90% of a CPU core (hyperthreaded) Status in linux package in Ubuntu: Triaged Bug description: I see high (70-90%) cpu usage from a kworker thread. Usually kworker/0:1 or kworker/0:2. This does not always happen. On some boots all is fine but once it shows, rebooting does not make it go away. WORKAROUND: Execute: echo "disable" > /sys/firmware/acpi/interrupts/gpe13 ProblemType: Bug DistroRelease: Ubuntu 12.10 Package: linux-image-3.5.0-19-generic 3.5.0-19.30 ProcVersionSignature: Ubuntu 3.5.0-19.30-generic 3.5.7 Uname: Linux 3.5.0-19-generic x86_64 ApportVersion: 2.6.1-0ubuntu6 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: mio 1965 F.... pulseaudio /dev/snd/pcmC0D0p: mio 1965 F...m pulseaudio Date: Wed Dec 5 22:37:00 2012 HibernationDevice: RESUME=UUID=a371882c-0fe7-45e5-9adb-83da8374bc11 InstallationDate: Installed on 2012-10-10 (55 days ago) InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1) MachineType: SAMSUNG ELECTRONICS CO., LTD. 700Z7C MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-19-generic root=UUID=79674508-93de-43e0-b313-f6a9b480c606 ro crashkernel=384M-2G:64M,2G-:128M acpi_osi=Linux pcie_aspm=force i915.modeset=1 i915.i915_enable_rc6=1 i915.lvds_downclock=1 i915.semaphores=1 i915.powersave=1 snd_hda_intel.power_save_controller=1 snd_hda_intel.power_save=1 quiet splash vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Home directory /home/mio not ours. No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-3.5.0-19-generic N/A linux-backports-modules-3.5.0-19-generic N/A linux-firmware 1.95 SourcePackage: linux UpgradeStatus: Upgraded to quantal on 2012-10-11 (55 days ago) dmi.bios.date: 08/02/2012 dmi.bios.vendor: Phoenix Technologies Ltd. dmi.bios.version: P04AAE dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: SAMSUNG_NP1234567890 dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: FAB1 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP04AAE:bd08/02/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pn700Z7C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1: dmi.product.name: 700Z7C dmi.product.version: 0.1 dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. --- ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: mio 1568 F.... pulseaudio CurrentDesktop: Unity:Unity7:ubuntu DistroRelease: Ubuntu 18.04 HibernationDevice: RESUME=UUID=3f9af81f-77f0-4438-9a4b-6722de269cbb InstallationDate: Installed on 2018-05-09 (9 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) MachineType: SAMSUNG ELECTRONICS CO., LTD. 700Z7C Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-20-generic root=UUID=7c436149-ab84-40d0-919f-032364393f9b ro quiet splash video=VGA1:d nouveau.runpm=0 vt.handoff=1 ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17 RelatedPackageVersions: linux-restricted-modules-4.15.0-20-generic N/A linux-backports-modules-4.15.0-20-generic N/A linux-firmware 1.173 Tags: bionic Uname: Linux 4.15.0-20-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lp lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 08/02/2012 dmi.bios.vendor: Phoenix Technologies Ltd. dmi.bios.version: P04AAE dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: SAMSUNG_NP1234567890 dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: FAB1 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP04AAE:bd08/02/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pn700Z7C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1: dmi.product.family: ChiefRiver System dmi.product.name: 700Z7C dmi.product.version: 0.1 dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. --- ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: mio 1568 F.... pulseaudio CurrentDesktop: Unity:Unity7:ubuntu DistroRelease: Ubuntu 18.04 HibernationDevice: RESUME=UUID=3f9af81f-77f0-4438-9a4b-6722de269cbb InstallationDate: Installed on 2018-05-09 (9 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) MachineType: SAMSUNG ELECTRONICS CO., LTD. 700Z7C Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-20-generic root=UUID=7c436149-ab84-40d0-919f-032364393f9b ro quiet splash video=VGA1:d nouveau.runpm=0 vt.handoff=1 ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17 RelatedPackageVersions: linux-restricted-modules-4.15.0-20-generic N/A linux-backports-modules-4.15.0-20-generic N/A linux-firmware 1.173 Tags: bionic Uname: Linux 4.15.0-20-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lp lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 08/02/2012 dmi.bios.vendor: Phoenix Technologies Ltd. dmi.bios.version: P04AAE dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: SAMSUNG_NP1234567890 dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: FAB1 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP04AAE:bd08/02/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pn700Z7C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1: dmi.product.family: ChiefRiver System dmi.product.name: 700Z7C dmi.product.version: 0.1 dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. 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