I haven't been able to compile 5.8-rc4 for some reason but have had success with 5.4.0-44 - I applied the patch to 5.4.0-44 and attached the dmesg file here. Hope this helps.
** Attachment added: "kernel messages from serial patched kernel 5.4.0-44" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886827/+attachment/5401335/+files/dmesg.txt -- 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/1886827 Title: Machine hangs when doing a normal reboot Status in linux package in Ubuntu: Incomplete Bug description: Hi, When booting into kernel 4.15.0-99-generic or higher and also kernel 5.3.0-53-generic or higher, the system hangs when issuing the reboot command or CTRL-ALT-DEL from console with the following console messages: ---------- snip ------------ Reached target Final Step. Starting Reboot... < following message repeats indefinetely every 120 seconds > INFO: task systemd-shutdow:1 blocked for more than 120 seconds. Not tainted 4.15.0-99-generic #100 " echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. ---------- snip ------------ I did a git bisect procedure between kernels 4.15.0-96-generic and 4.15.0-99 and it reported the following: ---------- snip ------------ b52be79f3c6cc89bb3834c5174843e34f945f386 is the first bad commit commit b52be79f3c6cc89bb3834c5174843e34f945f386 ---------- snip ------------ Ubuntu version affected: Ubuntu 4.15.0-99.100-generic 4.15.18 First kernel package affected: linux-image-4.15.0-99-generic Necessary debug files will be attached as soon as possible. Quinn --- ProblemType: Bug AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Jul 9 09:55 seq crw-rw---- 1 root audio 116, 33 Jul 9 09:55 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.9-0ubuntu7.15 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: DistroRelease: Ubuntu 18.04 HibernationDevice: RESUME=/dev/mapper/system-swap IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' Lsusb: Bus 001 Device 003: ID 0b38:0010 Gear Head 107-Key Keyboard Bus 001 Device 002: ID 8087:07e6 Intel Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: To be filled by O.E.M. To be filled by O.E.M. Package: linux (not installed) PciMultimedia: ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.15.0-99-generic root=/dev/mapper/system-root ro rootflags=subvol=@ biosdevname=0 net.ifnames=0 nomodeset "dyndbg=file drivers/base/* +p" ProcVersionSignature: Ubuntu 4.15.0-99.100-generic 4.15.18 RelatedPackageVersions: linux-restricted-modules-4.15.0-99-generic N/A linux-backports-modules-4.15.0-99-generic N/A linux-firmware 1.173.18 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' Tags: bionic Uname: Linux 4.15.0-99-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip disk plugdev sudo _MarkForUpload: True dmi.bios.date: 05/05/2016 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 5.6.5 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: Aptio CRB dmi.board.vendor: AMI Corporation dmi.board.version: To be filled by O.E.M. 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.:bvr5.6.5:bd05/05/2016:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnAMICorporation:rnAptioCRB:rvrTobefilledbyO.E.M.: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/1886827/+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
