Looking closer, the reason 3.11.x starts is that there are no dmraid device-mapper nodes created at all. I'm modifying the /init script so I can break in early, and re-run it to break-points of my choice, to do more diagnosis.
** Changed in: linux (Ubuntu) Assignee: (unassigned) => TJ (tj) ** Changed in: linux (Ubuntu) Status: Triaged => In Progress -- 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/1358491 Title: [Trusty] fails to boot with kernels later than v3.11: systemd- udevd: conflicting device node Status in “linux” package in Ubuntu: In Progress Bug description: I have a lab server named 'caddy' that is used for data recovery and forensics of disk drives. It has hot-swap drive bays for various disk interface types. Amongst others it has a Promise FasTrak TX2000 IDE 'fake' RAID controller. It was upgraded from Saucy to Trusty. After the upgrade the server fails to boot using kernel version 3.13.0-24-generic during early udev whilst still in the initrd. Errors of the form: [ 6.989549] systemd-udevd: inotify_add_watch(7, /dev/sdi2, 10) failed: No such file or directory ... [ 7.092733] systemd-udevd: conflicting device node '/dev/mapper/pdc_ecjaiecgch1' found, link to '/dev/dm-2' will not be created are reported for some devices, usually the Promise 'fake' RAID devices. The system hangs at that point without ever dropping to a busybox shell. Starting with an earlier Saucy kernel version 3.11.0-12-generic allows the server to start successfully. After some research it appears that maybe this is due to an incompatibility between systemd-udevd and device-mapper and/or dmraid- activate. I read in a similar Fedora bug report a comment by Kay Seivers: https://bugzilla.redhat.com/show_bug.cgi?id=867593#c11 "Device-mapper seems to mknod() things in /dev, which just can not work correctly today. There is nothing udev can fix here, it will never touch any device node, which should not exist in the first place, that is in the way." I've tried breaking initrd, but unless it is done at 'top' udevd starts and the system hits this problem. Serial console logs of the failed and successful boot attempts are attached To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1358491/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp