Public bug reported:
Calling `zfs send -v` is used for size estimation, it is expected to
return (called on focal here)
```bash
[cjr@hoare:/home/cjr]
$ zfs send -n -v
stank/backup/mccarthy/rpool/USERDATA/<...>@zrepl-20210426_094232_000
full send of
stank/backup/mccarthy/rpool/USERDATA/<...>@zrepl-20210426_094232_000 estimated
size is 126G
total estimated size is 126G
```
On hirsute, this feature is broken and returns
```bash
[cjr@mccarthy:/home/cjr]
$ /usr/sbin/zfs send -n -v rpool/USERDATA/<...>@zrepl-20210427_103846_000
warning: cannot send 'rpool/USERDATA/<...>@zrepl-20210427_103846_000': Unknown
error 103
```
which breaks my backup. Considering that it worked fine with focal and
groovy, I suspect the upgraded zfs packages to be at fault (although I
am not sure which of these).
Thanks for your consideration.
** Affects: zfs-linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1926284
Title:
`zfs send`dry-run estimation (`-n`) (perhaps more) broken
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