[Bug 1880768] Re: usermod/userdel errantly believe user has running processes

[Kevin Blackham]

** Summary changed:

- usermod/userdel errantly believe processes are in use
+ usermod/userdel errantly believe user has running processes

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to shadow in Ubuntu.
https://bugs.launchpad.net/bugs/1880768

Title:
  usermod/userdel errantly believe user has running processes

Status in shadow package in Ubuntu:
  New

Bug description:
  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]

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1880768/+subscriptions