[Bug 2044657] Re: zfs block cloning file system corruption

[Seth Arnold]

xnox, rincebrain came to the conclusion that the conditions for this bug
have existed since 0.6.2:
https://gist.github.com/rincebrain/e23b4a39aba3fadc04db18574d30dc73 and
robn thinks the conditions for this bug was introduced in 2006:
https://gist.github.com/rincebrain/e23b4a39aba3fadc04db18574d30dc73?permalink_comment_id=4778688#gistcomment-4778688
. (Both rincebrain and robn used appropriate waffle-words for something
from ten years and fifteen years ago.)

Upstream made a new 2.1.14 release:

https://github.com/openzfs/zfs/releases/tag/zfs-2.1.14

This is only coming to light with new coreutils using
SEEK_HOLE/SEEK_DATA -- before now these features were so rarely used the
bug was able to hide pretty well.

I suggest we should backport
https://github.com/openzfs/zfs/pull/15571/files through all our
currently supported systems.

Thanks

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https://bugs.launchpad.net/bugs/2044657

Title:
  zfs block cloning file system corruption

Status in linux-hwe-6.2 package in Ubuntu:
  Confirmed
Status in linux-hwe-6.5 package in Ubuntu:
  Confirmed
Status in zfs-linux package in Ubuntu:
  Confirmed

Bug description:
  OpenZFS 2.2 reportedly has a bug where block cloning might lead to
  file system corruption and data loss. This was fixed in OpenZFS 2.2.1.

  Original bug report: https://github.com/openzfs/zfs/issues/15526

  and 2.2.1 release notes:
  https://github.com/openzfs/zfs/releases/tag/zfs-2.2.1

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