ZFS suddenly `zfs` starts dumping core (avl_find() succeeded)

Y

yggdrasil

Hi,

I just noticed several error messages like
kernel: pid 23969 (zfs), uid 0: exited on signal 6 (core dumped)
Click to expand...
in /var/log/messages.
This apparently started May 1st.
A few tests show I can still create and destroy snapshots, and create new datasets, but can't delete datasets, or list all attributes:

Code: 
% zfs snapshot midgard/usr/home/yggdrasil@TEST
% zfs destroy midgard/usr/home/yggdrasil@TEST
% zfs create midgard/usr/home/yggdrasil/_TEST
% zfs destroy midgard/usr/home/yggdrasil/_TEST
Assertion failed: (avl_find() succeeded inside avl_add()), file /usr/src/cddl/lib/libuutil/../../../sys/cddl/contrib/opensolaris/common/avl/avl.c, line 649.
zsh: abort (core dumped)  zfs destroy midgard/usr/home/yggdrasil/_TEST
% zfs get all midgard/usr/home/yggdrasil
NAME                        PROPERTY               VALUE                  SOURCE
midgard/usr/home/yggdrasil  type                   filesystem             -
midgard/usr/home/yggdrasil  creation               Mon Nov  2 15:04 2015  -
midgard/usr/home/yggdrasil  used                   93.8G                  -
midgard/usr/home/yggdrasil  available              6.49M                  -
midgard/usr/home/yggdrasil  referenced             30.2G                  -
midgard/usr/home/yggdrasil  compressratio          1.46x                  -
Assertion failed: (avl_find() succeeded inside avl_add()), file /usr/src/cddl/lib/libuutil/../../../sys/cddl/contrib/opensolaris/common/avl/avl.c, line 649.
zsh: abort (core dumped)  zfs get all midgard/usr/home/yggdrasil

Google only brought me stuff from a few years/versions ago, or from ZFSonLinux, and most of that seems to be a Kernel panic, while here just the program crashes.

Any idea what happens here?

P.S. I also don't understand why it tells me I have only a few MB available when zpool list says 7GB free?! Even after upping available to 700 MB ZFS still crashes.
 
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