There is no test kernel available, yet, but a kernel will be made available for verification purposes via the proposed archive pocket as part of the kernel SRU process. The patch/commit was already accepted: https://lists.ubuntu.com/archives/kernel-team/2019-May/100674.html and applied to the bionic-next tree. One of the next steps is now to create that new kernel version and make it available via proposed. Once available an (automated) comment will be added to this ticket and you will be asked for verification. This may take some days - see 'Kernel prep' here: https://kernel.ubuntu.com/
-- 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/1828394 Title: [UBUNTU] qdio: clear intparm during shutdown Status in Ubuntu on IBM z Systems: Fix Committed Status in linux package in Ubuntu: Fix Released Status in linux source package in Bionic: Fix Committed Bug description: SRU Justification: [Impact] * Crash in qeth_irq() with "Unable to handle kernel pointer dereference in virtual kernel address space" [Fix] * 89286320a236d245834075fa13adb0bdd827ecaa 8928632 "s390/qdio: clear intparm during shutdown" [Test Case] * Offline an OSA CHPID with multiple active qeth interfaces. [Regression Potential] * The regression potential can be considered as very low since it only affects the s390x platform * and there it only affects the (ccW) qeth (OSA) network devices * and again this happens if the CHPID is offlined, which usually doesn't happen during regular operation. [Other Info] * The patch was upstream accepted with kernel 4.17, hence it's already part of cosmic, disco and eoan and proven there to work. * It needs to be applied to kernel 4.15 to land in 18.04 GA and 16.04.5 HWE. _________________________ Description: qdio: clear intparm during shutdown Symptom: Crash in qeth_irq() with "Unable to handle kernel pointer dereference in virtual kernel address space". Problem: During shutdown, qdio returns its ccw device back to control by qeth - but doesn't reset the interrupt parameter on the device. If qdio_shutdown() failed to terminate its long-running IO on the ccw_device, qeth will subsequently do so. In this case the IRQ for the IO completion is presented to qeth_irq() with the _old_ interrupt parameter, which gets mis-interpreted as a valid qeth_cmd_buffer pointer. Dereferencing this bogus pointer in qeth_release_buffer() triggers the crash. Solution: When returning the ccw device in qdio_shutdown(), also reset its interrupt parameter. Reproduction: Offline an OSA CHPID with multiple active qeth interfaces. Component: Kernel Upstream-ID: 89286320a236d245834075fa13adb0bdd827ecaa Reported: Ubuntu 18.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1828394/+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
