OpenZFS on OS X

I see this error in my log. What does that mean? How can I find out which disk / chassi it correlates to?
zpool status does not show any errors

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Jun 16 09:55:23 ihecc kernel[0]: zfs_vnop_pagein: dmu_read err 2
Jun 16 09:55:23 ihecc kernel[0]: zfs_vnop_pagein: dmu_read err 2


On my client where I run TimeMachine I get this:

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Jun 16 09:55:23 titan com.apple.backupd[12952]: Error writing to backup log.  NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error


So the problem with emu_read err seems to be propagated but zpool status does not complain about anything.

One of the Apps is doing mmap read of a file (becomes pagein operation) which returns error 2 (ENOENT), so the read operation will fail, and it is up to the App to handle that error. It is not an error with the pool.

It could suggest a bug in pagein perhaps, more research would be required.