Public bug reported: I have found an occasional inability to remove or modify users due to incorrect matching of process owners, e.g.
# id -u bdobbs 1047 # usermod -u 1573552 bdobbs usermod: user bdobbs is currently used by process 6337 # cat /proc/6337/status | grep Uid Uid: 3000400 3000400 3000400 3000400 In `libmisc/user_busy.c` a check is performed for processes owned by a user which is being modified. Searching subordinate user IDs causes errant matches. This has been fixed upstream, and is included in passwd-4.8 and the issue does not appear to exist in groovy. https://github.com/shadow- maint/shadow/commit/fd4405b763d26649339069532e79bd45013c8c38 I believe this fix should be backported to xenial and bionic. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: passwd 1:4.2-3.1ubuntu5.4 ProcVersionSignature: Ubuntu 4.4.0-1107.118-aws 4.4.219 Uname: Linux 4.4.0-1107-aws x86_64 ApportVersion: 2.20.1-0ubuntu2.23 Architecture: amd64 Date: Tue May 26 22:18:00 2020 Ec2AMI: ami-4e79ed36 Ec2AMIManifest: (unknown) Ec2AvailabilityZone: us-west-2a Ec2InstanceType: t3.medium Ec2Kernel: unavailable Ec2Ramdisk: unavailable ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/zsh SourcePackage: shadow UpgradeStatus: No upgrade log present (probably fresh install) modified.conffile..etc.cron.daily.passwd: [deleted] ** Affects: shadow (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug ec2-images patch-accepted-upstream xenial ** Patch added: "patch from upstream" https://bugs.launchpad.net/bugs/1880768/+attachment/5377125/+files/namespace.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1880768 Title: usermod/userdel errantly believe processes are in use To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1880768/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
