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 Touch seeded packages, which is subscribed to procps in Ubuntu. https://bugs.launchpad.net/bugs/910287 Title: ps hangs when listing root processes Status in procps package in Ubuntu: Confirmed Bug description: when running "ps a" on my system, the command just blocks, and will not respond to Ctrl+C, nor killall -9 ps. This also happens in gnome-system-monitor, if and only if viewing all processes (not just "my processes"). Strace output attached. Curiously, I can cancel out with Ctrl+C if using the strace wrapped process. ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: procps 1:3.2.8-10ubuntu5 ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4 Uname: Linux 3.0.0-12-generic x86_64 ApportVersion: 1.23-0ubuntu3 Architecture: amd64 Date: Sat Dec 31 02:22:15 2011 InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012) SourcePackage: procps UpgradeStatus: No upgrade log present (probably fresh install) mtime.conffile..etc.sysctl.conf: 2011-12-21T19:15:22.651303 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/procps/+bug/910287/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
