OpenZFS on OS X

I recently tried to upgrade from 1.4.2 to 1.4.5 and could not export my zpool because these two processes had files open even though the Mac OS X GUI gave no indication that they were even running! Command-Tabbing listed nothing but the Finder and Terminal. (My current working directory was not on mypool.)

When

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zpool export mytank

failed, I started looking at what processes were running by using

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ps ax

I noticed that these two applications were still alive even though the Dock did not show them running. I'd been looking at a few PDFs and a text file stored on mypool about half an hour ago.
Anyway,

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killall Preview

and

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 killall TextEdit

made it possible to cleanly export the pool and run the updater pkg. I had quit them normally without error, so they were not zombies.

This is on the latest version of El Capitan. Does OS X normally lie to you about which applications are running? Why?

Finding out which app has an open reference is tricky code, I'm actually more impressed when it manages to get the right one

You can also export -f, to force it to be unmounted. Although that comes at a risk, if you DID have Textedit open with an edited file, but just forgot about.