> Did this issue start happening after an update/upgrade? I did not have hard lockups before upgrading to 4.13.0-25. The lockup happened once, after several days past the upgrade. I did not look in the logs until after the lockup, so I can't tell if the tcp_fastretrans_alert errors were there with older kernels.
> Would it be possible for you to test the latest upstream kernel? Given that I had only one lockup so far and tcp_fastretrans_alert errors happen at unknown points, I can only see if such errors appear in logs after a few days of use. I cannot be sure if it fixes the lockup. -- 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/1744379 Title: tcp_fastretrans_alert kernel warnings, possible system hardlock Status in linux package in Ubuntu: Incomplete Bug description: I have experienced a full system lockup, not even SysRq+REISUB could reboot the system. In the kernel logs I noticed multiple tcp_fastretrans_alert warnings and the upstream bug (https://bugzilla.kernel.org/show_bug.cgi?id=195835, https://bugzilla.kernel.org/show_bug.cgi?id=60779) seems to indicate this may be the reason. In the attached kernel log, the hang happened immediately before the last reboot. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: linux-image-4.13.0-25-generic 4.13.0-25.29 ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13 Uname: Linux 4.13.0-25-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia ApportVersion: 2.20.7-0ubuntu3.7 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC3: lastique 3183 F.... pulseaudio /dev/snd/controlC1: lastique 3183 F.... pulseaudio /dev/snd/controlC2: lastique 3183 F.... pulseaudio /dev/snd/controlC0: lastique 3183 F.... pulseaudio CurrentDesktop: KDE Date: Fri Jan 19 22:26:36 2018 InstallationDate: Installed on 2015-05-01 (993 days ago) InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) MachineType: System manufacturer System Product Name ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-25-generic root=UUID=a03f1835-52f9-4409-9da7-fe45770637ae ro quiet splash nomdmonddf nomdmonisw RelatedPackageVersions: linux-restricted-modules-4.13.0-25-generic N/A linux-backports-modules-4.13.0-25-generic N/A linux-firmware 1.169.1 RfKill: 0: hci0: Bluetooth Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: Upgraded to artful on 2017-11-03 (76 days ago) dmi.bios.date: 11/09/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 3603 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: P8Z68-V PRO dmi.board.vendor: ASUSTeK Computer INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3603:bd11/09/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8Z68-VPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.family: To be filled by O.E.M. dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1744379/+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