Versions Affected : All versions prior to TrueNAS 12.0-U2

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Description

A regression in FreeBSD 12.2 causes zfs receive to fail to delete snapshots that have been deleted on the source side.

Backup and replication systems based on ZFS send/receive that manage snapshots solely on the source side will fail to delete snapshots on the destination side. This may lead to out-of-space conditions on the destination.

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Workaround

Errant snapshots can be manually removed from the destination with “zfs destroy”. Backup and replication systems that don’t use the -R flag with zfs send will be unaffected. For example, sysutils/zrepl is unaffected.

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Mitigation

• Upgrade to TrueNAS 12.0-U2 or later.

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Commit

• FreeBSD Revision : r369173

• TrueNAS Commit : ddd70e3

• TrueNAS Commit : 5a493a3

• JIRA Ticket : NAS-109168

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Further information

• FreeBSD Errata Entry