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On Fedora 21, a fedora-readonly root system hangs during boot with: 'A start job is running for udev Kernel Device Manager ...' initscripts-9.55-2.fc21.x86_64 systemd-215-11.fc21.x86_64
Can you please append "debug" on the kernel line and then send ouptup of journal for that boot. http://freedesktop.org/wiki/Software/systemd/Debugging/
There is no further output when using debug. It seems as it's not systemd-udevd in the actual system, but dracut pre-udev/udev that's causing the issue.
Can you please try to confirm that? For example by placing rd.break on kernel cmdline?
Created attachment 930842 [details] journal created with systemd-udevd debug in rd.break=pre-udev
Created attachment 930881 [details] last log did not contain udev debugging, this one does.
I have upgraded kernel and some packages like dhclient and now the boot stops directly after pre-udev. How can I debug further. I can boot into rd.pre-udev but what could I do then?
Created attachment 933651 [details] serial debug
Created attachment 933960 [details] serial debug without rd.debug
Created attachment 934040 [details] serial debug with modified initrd
The following patches are necessary to make it work again: http://cgit.freedesktop.org/systemd/systemd/commit/?id=6f4f8056d3f972c1e6ee7f5fc40ed283fd93152a http://cgit.freedesktop.org/systemd/systemd/commit/?id=f3b8fbb1da6519e14985ea444f8304673d20ad3f This one is optional, but might also help in some cases. http://lists.freedesktop.org/archives/systemd-devel/2014-September/022845.html Thanks to haraldh for his help on that.
systemd-215-14.fc21 has been submitted as an update for Fedora 21. https://admin.fedoraproject.org/updates/systemd-215-14.fc21
Package systemd-215-14.fc21: * should fix your issue, * was pushed to the Fedora 21 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing systemd-215-14.fc21' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2014-10195/systemd-215-14.fc21 then log in and leave karma (feedback).
systemd-215-14.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.