More tests on a bare-metal and a KVM node with 4.18.0-18 / -17 / -16 / -11 shows that: * This issue can be reproduced on these kernels * Bare metal system tend to pass with the ftrace test on the first run, but it will hang with the second / third attempt if you run it again * KVM nodes tend to fail on the first attempt (3 out of 4 kernels), and if it has passed, the second attempt will reproduce this as well.
As the fact that the test tend to pass with the first attempt on bare metals, and we might just retry if has failed, I think all these combined leads to this situation. For the patched kernel, I can re-run the ftrace test for 5 times without any interruptions on both of the bare-metal and the KVM node. I will test Bionic next and prepare a SRU for Cosmic. -- 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/1826385 Title: ftrace in ubuntu_kernel_selftests hang with Cosmic kernel Status in ubuntu-kernel-tests: New Status in linux package in Ubuntu: Confirmed Status in linux source package in Cosmic: New Bug description: This issue is a bit strange. The test has passed with Cosmic 4.18.0-18.19 generic kernel on AMD64 node during our SRU testing process. https://pastebin.ubuntu.com/p/HN2vN6fCXn/ However, Tyler found that this test will hang after: [30] Kretprobe dynamic event with maxactive [PASS] [31] Register/unregister many kprobe events [PASS] And this is 100% reproducible. No relevant output in syslog. This will need further investigation. ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: linux-image-4.18.0-18-generic 4.18.0-18.19 ProcVersionSignature: User Name 4.18.0-18.19-generic 4.18.20 Uname: Linux 4.18.0-18-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Apr 25 07:16 seq crw-rw---- 1 root audio 116, 33 Apr 25 07:16 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.10-0ubuntu13.2 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: Date: Thu Apr 25 07:18:51 2019 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: QEMU Standard PC (i440FX + PIIX, 1996) PciMultimedia: ProcFB: 0 cirrusdrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-18-generic root=UUID=2f68c627-8ab4-40d5-8c06-6563436d0f96 ro RelatedPackageVersions: linux-restricted-modules-4.18.0-18-generic N/A linux-backports-modules-4.18.0-18-generic N/A linux-firmware 1.175.3 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/01/2014 dmi.bios.vendor: SeaBIOS dmi.bios.version: Ubuntu-1.8.2-1ubuntu1 dmi.chassis.type: 1 dmi.chassis.vendor: QEMU dmi.chassis.version: pc-i440fx-xenial dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial: dmi.product.name: Standard PC (i440FX + PIIX, 1996) dmi.product.version: pc-i440fx-xenial dmi.sys.vendor: QEMU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1826385/+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
