** Changed in: zfs-linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: zfs-linux (Ubuntu)
       Status: New => In Progress

** Changed in: zfs-linux (Ubuntu)
     Assignee: (unassigned) => Colin Ian King (colin-king)

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https://bugs.launchpad.net/bugs/1901417

Title:
  zfs mount segmentation fault when target directory is non empty

Status in zfs-linux package in Ubuntu:
  In Progress

Bug description:
  Hi,

  I just had made some mistake in a mounting order, thus producing non-
  empty target directory.

  Imagine a pool name pool1 and zfs filesystems pool1 and pool1/a  which
  are (due to different encryption keys) to be mounted as

  /pool1/a

  one in another. (Because of encryption not automatically mounted)

  
  I made a simple mistake and mounted /pool1/a before /pool1, but noticed and 
unmounted /pool1/a before mounting /pool1, but forget to rmdir /pool1/a, so 
/pool1 was not empty when mounting /pool1.


  # zfs mount -a
  cannot mount '/pool1': directory is not empty
  zsh: segmentation fault (core dumped)  zfs mount -a


  Segmentation faults should not happen.

  
  after rmdir /pool1/a (i.e. make the target empty), things work as normal.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: zfsutils-linux 0.8.3-1ubuntu12.4
  ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
  Uname: Linux 5.4.0-48-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.10
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: LXQt
  Date: Sun Oct 25 15:28:45 2020
  InstallationDate: Installed on 2018-04-30 (909 days ago)
  InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 
(20180426)
  SourcePackage: zfs-linux
  UpgradeStatus: Upgraded to focal on 2020-10-02 (23 days ago)
  modified.conffile..etc.sudoers.d.zfs: [inaccessible: [Errno 13] Keine 
Berechtigung: '/etc/sudoers.d/zfs']

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