** Changed in: ubuntu-z-systems Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
-- 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: Triaged Status in linux package in Ubuntu: New Bug description: 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