[Bug 1847628] Re: When using swap in ZFS, system stops when you start using swap

[Richard Laager]

> "com.sun:auto-snapshot=false" do we need to add that or does our zfs
not support it?

You do not need that. That is used by some snapshot tools, but Ubuntu is
doing its own zsys thing.

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Title:
  When using swap in ZFS, system stops when you start using swap

Status in Release Notes for Ubuntu:
  New
Status in Native ZFS for Linux:
  Unknown
Status in ubiquity package in Ubuntu:
  Incomplete
Status in zfs-linux package in Ubuntu:
  Incomplete

Bug description:
  # Problem

  When using swap in ZFS, system stops when you start using swap.

  > stress --vm 100

  if you doing swapoff will only occur OOM and the system will not stop.

  # Environment

  jehos at MacBuntu:~$ lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu Eoan Ermine (development branch)
  Release:        19.10
  Codename:       eoan

  jehos at MacBuntu:~$ dpkg -l | grep zfs
  ii  libzfs2linux                               0.8.1-1ubuntu13                     amd64        OpenZFS filesystem library for Linux
  ii  zfs-initramfs                              0.8.1-1ubuntu13                     amd64        OpenZFS root filesystem capabilities for Linux - initramfs
  ii  zfs-zed                                    0.8.1-1ubuntu13                     amd64        OpenZFS Event Daemon
  ii  zfsutils-linux                             0.8.1-1ubuntu13                     amd64        command-line tools to manage OpenZFS filesystems

  jehos at MacBuntu:~$ uname -a
  Linux MacBuntu 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

  jehos at MacBuntu:~$ zpool list
  NAME    SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP    HEALTH  ALTROOT
  bpool  1.88G  66.1M  1.81G        -         -      -     3%  1.00x    ONLINE  -
  rpool   230G   124G   106G        -         -     9%    53%  1.00x    ONLINE  -

  jehos at MacBuntu:~$ zfs get all rpool/swap
  NAME        PROPERTY              VALUE                    SOURCE
  rpool/swap  type                  volume                   -
  rpool/swap  creation              목 10월 10 15:56 2019  -
  rpool/swap  used                  2.13G                    -
  rpool/swap  available             98.9G                    -
  rpool/swap  referenced            72K                      -
  rpool/swap  compressratio         1.11x                    -
  rpool/swap  reservation           none                     default
  rpool/swap  volsize               2G                       local
  rpool/swap  volblocksize          4K                       -
  rpool/swap  checksum              on                       default
  rpool/swap  compression           zle                      local
  rpool/swap  readonly              off                      default
  rpool/swap  createtxg             34                       -
  rpool/swap  copies                1                        default
  rpool/swap  refreservation        2.13G                    local
  rpool/swap  guid                  18209330213704683244     -
  rpool/swap  primarycache          metadata                 local
  rpool/swap  secondarycache        none                     local
  rpool/swap  usedbysnapshots       0B                       -
  rpool/swap  usedbydataset         72K                      -
  rpool/swap  usedbychildren        0B                       -
  rpool/swap  usedbyrefreservation  2.13G                    -
  rpool/swap  logbias               throughput               local
  rpool/swap  objsetid              393                      -
  rpool/swap  dedup                 off                      default
  rpool/swap  mlslabel              none                     default
  rpool/swap  sync                  always                   local
  rpool/swap  refcompressratio      1.11x                    -
  rpool/swap  written               72K                      -
  rpool/swap  logicalused           40K                      -
  rpool/swap  logicalreferenced     40K                      -
  rpool/swap  volmode               default                  default
  rpool/swap  snapshot_limit        none                     default
  rpool/swap  snapshot_count        none                     default
  rpool/swap  snapdev               hidden                   default
  rpool/swap  context               none                     default
  rpool/swap  fscontext             none                     default
  rpool/swap  defcontext            none                     default
  rpool/swap  rootcontext           none                     default
  rpool/swap  redundant_metadata    all                      default
  rpool/swap  encryption            off                      default
  rpool/swap  keylocation           none                     default
  rpool/swap  keyformat             none                     default
  rpool/swap  pbkdf2iters           0                        default

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