/lib/systemd/systemd-udevd:6:__GI_epoll_pwait:sd_event_wait:sd_event_run:sd_event_loop:run

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding systemd. This problem was most recently seen with package version 234-2ubuntu12.1, the problem page at https://errors.ubuntu.com/problem/e1e4b6f7791262623c4db6101f6110330b56e59c contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.