It seems one of the RAM modules in that machine degraded over time - while memtest86 found no problems in the past, now errors are discovered within seconds.
It's unclear when the module became faulty, but it's quite plausible that the observed kernel panics were caused by this and that there's no actual software bug involved. I'll replace the system RAM and revert back to the normal Ubuntu kernel. I think this issue can be closed - if the same symptoms reassert themselves, things can be revisited. -- 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/1779063 Title: Occasional kernel panic on shutdown in ext4 code (dquot_drop) Status in linux package in Ubuntu: Incomplete Bug description: Occasionally (about once every three weeks) my machine experiences a kernel panic somewhere in the ext4 code on shutdown (and only on shutdown). Ubuntu Version: 18.04, x86-64 Platform: AMD Ryzen R7 2700 on an Asrock AB350M-Pro4 mainboard. I attached two photos of the panic messages, one occurring on May 16th, the other on June 26th. The call trace is identical in both. Given how similar the messages are, I don't think this is an intermittent machine-related glitch. As of yet, however, I could not identify a pattern on when the issue occurs. Kernel versions: - May 16th: 4.15.0-20-generic - June 26th: 4.15.0-23-generic --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: maik 1743 F.... pulseaudio /dev/snd/controlC1: maik 1743 F.... pulseaudio /dev/snd/controlC0: maik 1743 F.... pulseaudio CurrentDesktop: GNOME DistroRelease: Ubuntu 18.04 HibernationDevice: RESUME=UUID=a4be9bd2-a879-438d-be59-41d095ad18fb InstallationDate: Installed on 2017-08-25 (306 days ago) InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Release amd64 (20170412) MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic root=UUID=20c38f5a-e4d2-4cee-9daa-84a848f15452 ro quiet splash vt.handoff=1 ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18 RelatedPackageVersions: linux-restricted-modules-4.15.0-23-generic N/A linux-backports-modules-4.15.0-23-generic N/A linux-firmware 1.173.1 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no Tags: bionic Uname: Linux 4.15.0-23-generic x86_64 UpgradeStatus: Upgraded to bionic on 2018-04-26 (62 days ago) UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 05/08/2018 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: L4.82 dmi.board.name: AB350M Pro4 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.:bvrL4.82:bd05/08/2018:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnAB350MPro4: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/1779063/+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
