Public bug reported:
When creating a pool snapshot on a freenas/freebsd like this:
```
root@freenas:~ # uname -a
FreeBSD freenas.local 11.0-STABLE FreeBSD 11.0-STABLE #0
r321665+25fe8ba8d06(freenas/11.0-stable): Mon Sep 25 06:24:11 UTC 2017
root@gauntlet:/freenas-11-releng/freenas/_BE/objs/freenas-11-releng/freenas/_BE/os/sys/FreeNAS.amd64
amd64
freenas# zpool create tank gptid/62a26be7-cd4a-11e7-927b-0800278dcda9
freenas# dd if=/dev/zero of=/tank/ur.bin bs=64K count=1
freenas# zfs snap tank@example
```
And trying to `zfs send | zfs recv` it to an ubuntu zfs like this:
```
space@ubuntu:~$ apt-cache policy zfsutils-linux
zfsutils-linux:
Installed: 0.6.5.11-1ubuntu3
Candidate: 0.6.5.11-1ubuntu3
Version table:
*** 0.6.5.11-1ubuntu3 500
500 http://us.archive.ubuntu.com/ubuntu artful/main amd64 Packages
100 /var/lib/dpkg/status
space@ubuntu:~$ lsb_release -rd
Description: Ubuntu 17.10
Release: 17.10
root@ubuntu:~$ ssh root@freenas zfs send tank@example > freenas11.zfssend
root@ubuntu:~# cat ./freenas11.zfssend | zfs recv tank/something
```
The `zfs recv` process burns 100% CPU and hangs forever. I have attached
an example freenas11.zfssend file, though it's easily reproduced.
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: zfsutils-linux 0.6.5.11-1ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
Date: Sun Nov 19 22:10:15 2017
ExecutablePath: /sbin/zfs
InstallationDate: Installed on 2017-11-17 (2 days ago)
InstallationMedia: Ubuntu-Server 17.10 "Artful Aardvark" - Release amd64
(20171017.1)
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
TERM=xterm-256color
PATH=(custom, no user)
SourcePackage: zfs-linux
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: zfs-linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug artful freebsd zfs zol
** Attachment added: "A sample zfs send from a freenas11"
https://bugs.launchpad.net/bugs/1733230/+attachment/5011465/+files/freenas11.zfssend
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https://bugs.launchpad.net/bugs/1733230
Title:
'zfs recv' hangs when receiving from a FreeBSD zfs
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