Investigating why /dev doesn't have the correct links even if they're present led me to look at /usr/share/initramfs-tools/scripts/init-bottom/udev (provided via the udev dpkg from systemd)
In there, the mount -n -o move is used to migrate the /dev from initramfs to the rootfs/dev This bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=844775 Indicated that the initramfs may have util-linux version of mount which needs to use mount --move instead. This is addressed in newer systemd packages (in bionic for sure) And the mount line now looks like this: # move the /dev tmpfs to the rootfs; fall back to util-linux mount that does # not understand -o move mount -n -o move /dev ${rootmnt}/dev || mount -n --move /dev ${rootmnt}/dev Let's see if that helps resolve the "missing" symlinks. On Thu, Nov 30, 2017 at 10:27 AM, Ryan Harper <[email protected]> wrote: > So, /dev/bcache/by-uuid is not getting created. > > That's the same kernel bug I filed. > > And, if they were, I think they'd get moved properly. > > init-bottom/udev script does the following: > > # Stop udevd, we'll miss a few events while we run init, but we catch up > udevadm control --exit > > # move the /dev tmpfs to the rootfs > mount -n -o move /dev ${rootmnt}/dev > > That "move" operation migrates the entire mounted directory to a new > location > so, if /dev/bcache/by-uuid existed, it would be present when systemd init > runs. > > AFAICT, there's not fix here without the kernel side. > > On Thu, Nov 30, 2017 at 10:09 AM, Dmitrii Shcherbakov < > [email protected]> wrote: > >> Just in case also checked with this rule that creates links at /dev >> /dev/disk/by-uuid /dev/bcache/by-uuid https://paste.ubuntu.com/26081756/ >> >> They are all there originally (see the screenshot). >> >> But not there afterwards. So it's not just a problem with a different >> path. >> >> https://paste.ubuntu.com/26081775/ >> >> ubuntu@maas-xenial4:~$ tree /dev/ | grep bcache >> ├── bcache0 >> ├── bcache1 >> ├── bcache2 >> ├── bcache3 >> │ ├── 251:0 -> ../bcache0 >> │ ├── 251:1 -> ../bcache1 >> │ ├── 251:2 -> ../bcache2 >> │ ├── 251:3 -> ../bcache3 >> │ │ ├── bcache0 -> ../../bcache0 >> │ │ ├── bcache1 -> ../../bcache1 >> │ │ ├── bcache2 -> ../../bcache2 >> │ │ ├── bcache3 -> ../../bcache3 >> >> >> ** Attachment added: "bcache-multiple-links.png" >> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/172914 >> 5/+attachment/5016592/+files/bcache-multiple-links.png >> >> -- >> You received this bug notification because you are subscribed to the bug >> report. >> https://bugs.launchpad.net/bugs/1729145 >> >> Title: >> /dev/bcache/by-uuid links not created after reboot >> >> To manage notifications about this bug go to: >> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729145 >> /+subscriptions >> > > -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1729145 Title: /dev/bcache/by-uuid links not created after reboot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729145/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
