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zfs: fix handling of unsupported features
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Authored by mm on Feb 26 2021, 10:59 AM.

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Summary

After the recent import from OpenZFS it has become possible to import ZFS pools witn an active org.illumos:edonr feature on FreeBSD, leading to a panic. In addition, "zpool status" reported all pools without edonr as upgradable and "zpool upgrade -v" lists edonr in the list of upgradable features.

To avoid the panic and eventual FS corruption we should deploy a fix even before it has been accepted upstream.

Reference:
https://github.com/openzfs/zfs/pull/11653

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R10 FreeBSD src repository
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