This bug was uncovered after a behavior change in upstream systemd (udevadm): https://github.com/systemd/systemd/issues/13652#issuecomment-535129791
** Bug watch added: github.com/systemd/systemd/issues #13652 https://github.com/systemd/systemd/issues/13652 -- 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/1845319 Title: writing 'add' to /sys/devices/vio/uevent fails with ENODEV Status in linux package in Ubuntu: In Progress Status in linux source package in Bionic: In Progress Status in linux source package in Disco: In Progress Status in linux source package in Eoan: In Progress Bug description: [impact] The systemd-udev-trigger service calls 'udevadm trigger --type=devices --action=add', which writes 'add' to all /sys/devices/ uevent nodes, to re-generate their uevents sent to udev. Until systemd commit 97afc0351a96e0daa83964df33937967c75c644f, any errors during this process were simply logged to debug and ignored, but now udevadm will log errors and return failure. On ppc64el, the /sys/devices/vio device returns ENODEV when writing 'add' to its uevent, which causes the udevadm command to return failure, which causes the systemd-udev-trigger system service to fail. The kernel vio driver should be fixed to not return ENODEV. [test case] On a ppc64el system, with any systemd containing commit 97afc0351a96e0daa83964df33937967c75c644f, check the status of the systemd-udev-trigger service, to see that it's failed. Alternately, again on a ppc64el system, run as root: # echo add > /sys/devices/vio/uevent -bash: echo: write error: No such device [regression potential] the potential should be low, as this appears to have always behaved this way, at least for a while now. [other info] the systemd commit that changes udevadm to start failing for this error isn't included in any Ubuntu release yet, this is found from systemd upstream testing. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1845319/+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
