IO error with overwriting when ZVOL space is full

[TimLand]

System information

Type	Version/Name
Distribution Name	Ubuntu
Distribution Version	16.04
Linux Kernel	4.4.0-24
Architecture	x86
ZFS Version	0.8.6-1
SPL Version	0.8.6-1

Describe the problem you're observing

We used the vdbench tool to perform a stress test on ZVOL. After running for a few days, vdbench got an io error exception. We found that the ZVOL volume was full. But we use the dd （ dd if=/dev/zero of=/dev/zvol/b6bd4b4c90844cbe8fbe0222ecb23109/0aa8e41118094174b2392f42b42c21f7 bs=1M count=10 oflag=direct）tool writing data start from 0 position and still get the io error exception.

Describe how to reproduce the problem

The easiest way to do this is, write fill up the zvol, then dd it write some data start from 0 offset

Include any warning/errors/backtraces from the system logs

[TimLand]

[sempervictus]

It might be useful to add the ZVOL tag to all of these ZVOL issues. The subsystem is neglected and having a face full of "issues with the component" tags on the issues pages might provide impetus for someone to address (or stop trying to use them).

[stale]

This issue has been automatically marked as "stale" because it has not had any activity for a while. It will be closed in 90 days if no further activity occurs. Thank you for your contributions.

[behlendorf]

If this pool is using raidz, then this issue appears to be a duplicate of #8973 which was fixed in the 2.0 release.

[stale]

This issue has been automatically marked as "stale" because it has not had any activity for a while. It will be closed in 90 days if no further activity occurs. Thank you for your contributions.

[behlendorf]

Closing as duplicate of #8973