I just upgraded from 16.04 (via >16.10) to 17.04 and now I'm seeing this too. I tried the strace and observed that ps was hanging trying to list the commandline of the thunderbird process. I had already exited Thunderbird and there were no indications in the GUI that it was still running. I had no luck getting rid of the process with kill -9. Also I could not shut the machine down cleanly. I did findi a bunch of NMI watchdog: BUG: soft lockup messages in syslog, which I'll attach to the bug report.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910287 Title: ps hangs when listing root processes To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/procps/+bug/910287/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
