Comment 7 for bug 910287

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.