Public bug reported: Same scenario as Bug #1731796; probably same root cause.
Observed the lockup a bit more closely this time. It began with compiz in Z state (according to top), consuming 100% of a cpu. In this situation, it was possible to ssh to the system. I was running software updater, and could see various activity by aptd, dpkg, and htppd - the latter running as -apt or some similar named system account. Unfortunately, "software updater" is not a parent for this activity, so I couldn't be sure that it had exited (and it might eventually have blocked on compiz), but I waited until the apt/dpkg activity stopped before power cycling. This time the system came back much more sane - no need to run "dpkg --reconfigure -a" from ssh. NOTE - as well as the soft lockups (which I didn't verify this time), we have the zombie process. ProblemType: Package DistroRelease: Ubuntu 16.04 Package: samba 2:4.3.11+dfsg-0ubuntu0.16.04.11 ProcVersionSignature: Ubuntu 4.4.0-98.121-generic 4.4.90 Uname: Linux 4.4.0-98-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.20.1-0ubuntu2.10 Architecture: amd64 Date: Fri Nov 24 16:50:11 2017 ErrorMessage: subprocess new pre-removal script returned error exit status 1 InstallationDate: Installed on 2012-04-26 (2038 days ago) InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425) NmbdLog: OtherFailedConnect: Yes RelatedPackageVersions: dpkg 1.18.4ubuntu1.2 apt 1.2.24 SambaServerRegression: Yes SmbConfIncluded: Yes SmbLog: SourcePackage: samba Title: package samba 2:4.3.11+dfsg-0ubuntu0.16.04.11 failed to install/upgrade: subprocess new pre-removal script returned error exit status 1 UpgradeStatus: Upgraded to xenial on 2017-03-31 (238 days ago) ** Affects: samba (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-package xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1734405 Title: package samba 2:4.3.11+dfsg-0ubuntu0.16.04.11 failed to install/upgrade: subprocess new pre-removal script returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1734405/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs