using the 4.15.0-041500-generic kernel, the total process count was very high (473) just after the boot, perhaps something to do with the raid array resync.
Now doing backup to the external disk, process count seems normal (287). I still think there is a problem with that process count since older kernel never showed more than 286 thread in the last year. ** Tags added: kernel-bug-exists-upstream ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- 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/1747597 Title: Number of processes exploded after upgrade to 4.13.0-32-generic Status in linux package in Ubuntu: Confirmed Bug description: After an update from 4.10.0-40-generic to 4.13.0-32-generic (ubuntu 16.04 + hwe kernel), the number of process when doing IO on my machine has exploded. Before the update, maximum number of process : 284 After the update, doing a simple rsync to an external disk : 771 The system is now unstable and crashes. The processes are hundreds of "kworker". Please let me know if there is something more needed. --- AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Feb 6 09:04 seq crw-rw---- 1 root audio 116, 33 Feb 6 09:04 timer AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.13.0-32-generic. AplayDevices: aplay: device_list:268: no soundcards found... ApportVersion: 2.20.1-0ubuntu2.15 Architecture: amd64 ArecordDevices: arecord: device_list:268: no soundcards found... AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: DistroRelease: Ubuntu 16.04 IwConfig: Error: [Errno 2] No such file or directory MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. Package: linux (not installed) PciMultimedia: ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic root=UUID=ef4f1569-51cf-478d-868c-78a3b7f04a2c ro ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13 RelatedPackageVersions: linux-restricted-modules-4.13.0-32-generic N/A linux-backports-modules-4.13.0-32-generic N/A linux-firmware 1.157.15 RfKill: Error: [Errno 2] No such file or directory Tags: xenial Uname: Linux 4.13.0-32-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm audio cdrom dip kvm libvirtd lpadmin lxd plugdev sambashare sudo sudo-no-log video _MarkForUpload: True dmi.bios.date: 05/17/2016 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P2.70 dmi.board.name: Z97 Extreme6 dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.70:bd05/17/2016:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ97Extreme6:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.family: To Be Filled By O.E.M. dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1747597/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp