This problem report is related to 1910588. I am running kernel 5.8.0-36 now and found that the dd command I was using to test zfs raidz1 performance worked the last time I tried. dd now provides speed measurement skewed by arc though (2.0GB/s).
I have run memtest86 on this machine recently. Four passes found no errors. The machine memory is non-ECC though. I'll try again after the next reboot. -- 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/1910806 Title: System hang - kernel 5.8.0-36 Status in linux package in Ubuntu: Confirmed Bug description: I reported what I believe to be the same problem yesterday with kernel -34 but running the rsync command to create a backup. I can cause the system to hang with the following commands: dd if=Win10_20H2_v2_English_x64.iso of=/dev/null bs=8192k cp Win10_20H2_v2_English_x64.iso /var/tmp The source file resides on a zfs filesystem in a raidz1 pool (4 x 4TB Seagate drives) These commands and the rsync work with kernel 5.8.0-33 The filename describes the contents. zpool scrub runs without errors... cw0624@cascade:~/Documents/Computing/Windows$ ls -l *.iso -rw-r--r-- 1 jcw0624 staff 6221846528 Dec 20 12:18 Win10_20H2_v2_English_x64.iso jcw0624@cascade:~/Documents/Computing/Windows$ zpool status pool: data state: ONLINE scan: scrub repaired 0B in 0 days 00:22:28 with 0 errors on Fri Jan 8 11:48:13 2021 config: NAME STATE READ WRITE CKSUM data ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 sda ONLINE 0 0 0 sdb ONLINE 0 0 0 sdc ONLINE 0 0 0 sdd ONLINE 0 0 0 errors: No known data errors jcw0624@cascade:~/Documents/Computing/Windows$ ProblemType: Bug DistroRelease: Ubuntu 20.10 Package: linux-image-5.8.0-36-generic 5.8.0-36.40 ProcVersionSignature: Ubuntu 5.8.0-36.40-generic 5.8.18 Uname: Linux 5.8.0-36-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp nvidia_modeset zcommon znvpair nvidia ApportVersion: 2.20.11-0ubuntu50.3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: jcw0624 5470 F.... pulseaudio /dev/snd/controlC1: jcw0624 5470 F.... pulseaudio CasperMD5CheckResult: skip Date: Fri Jan 8 11:56:46 2021 InstallationDate: Installed on 2020-10-03 (97 days ago) InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731) IwConfig: lo no wireless extensions. enp9s0 no wireless extensions. MachineType: To be filled by O.E.M. To be filled by O.E.M. ProcEnviron: LANGUAGE=en_CA:en TERM=xterm-256color PATH=(custom, no user) LANG=en_CA.UTF-8 SHELL=/bin/bash ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-36-generic root=UUID=89ed8b12-0ade-4a0f-91c3-8f9f4b3a8a81 ro quiet splash vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-5.8.0-36-generic N/A linux-backports-modules-5.8.0-36-generic N/A linux-firmware 1.190.2 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to groovy on 2020-11-09 (60 days ago) dmi.bios.date: 10/16/2012 dmi.bios.release: 4.6 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1604 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: SABERTOOTH 990FX dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev 1.xx 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.:bvr1604:bd10/16/2012:br4.6:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnSABERTOOTH990FX:rvrRev1.xx: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.sku: 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/1910806/+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
