While working on this SRU a set of patched kernel packages was created that were now made available here for further testing: https://people.canonical.com/~fheimes/lp1893778/
-- 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/1893778 Title: [UBUNTU 20.04] zPCI device hot-plug during boot may result in unusable device Status in Ubuntu on IBM z Systems: New Status in linux package in Ubuntu: Fix Released Status in linux source package in Focal: New Status in linux source package in Groovy: Fix Released Bug description: When a PCI device (including virtio-pci for which this is easiest to test) is hot-plugged while Linux is still booting, it can be detected as an entry in CLP List PCI Functions (basically equivalent to boot time probing on other architectures) and with the hot-plug event. In this case the hot-plug event will be stale but Linux still tried to add and enable the device leading a) to a duplicate entry in zPCI internal device list b) an attempt to enable the device witha stale function handle Part b) would lead to the device being place in the error state and make it unusable. This can most easily be reproduced using KVM and doing # sudo virsh start myguest && sudo virsh attach-device myguest hotplug_pci_block.xml Where hotplug_pci_block.xml looks like the following: <disk device="disk" type="file"> <driver name="qemu" type="raw" /> <address type="pci"> <zpci fid="4660" uid="4660" /> </address> <source file="testdisk.img" /> <target bus="virtio" dev="vdt" /> </disk> The problem is fixed with the 3-line upstream commit b76fee1bc56c31a9d2a49592810eba30cc06d61a s390/pci: ignore stale configuration request event I also confirmed that as of the focal tag Ubuntu-5.4.0-46.50 this cherry-picks cleanly. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1893778/+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
