That zloop failure looks similar to what happened the previous run that also 
failed zloop; see 
[here](http://jenkins.open-zfs.org/blue/organizations/jenkins/openzfs%2Fopenzfs/detail/PR-494/6/pipeline/211).
 There _might_ be some information that can be gathered from the zloop files, 
which can be downloaded 
[here](http://jenkins.open-zfs.org/job/openzfs/job/openzfs/job/PR-494/9/artifact/run-zloop-results.tar.xz).
 If there's nothing useful in there, can you try running zloop locally to see 
if you can trigger anything abnormal?

I have a hunch that zloop is getting "stuck", and then is killed by the Jenkins 
time limit after it fails to return. It's supposed to run for only 1.5 hours, 
and then has a 2 hour time limit enforce by Jenkins. In this case, it looks 
like the underlying ztest process was only supposed to run for 56 seconds:
```
11/29 19:31:01 ztest -VVVVV -m 2 -r 0 -R 1 -v 2 -a 9 -T 56 -P 23 -s 128m -f 
/var/tmp/test_results
```
but it seems as though it didn't return after 2 hours (hence hitting the time 
limit, and being killed).

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