[Bug 193803] New: zvol promote failing

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193803

            Bug ID: 193803
           Summary: zvol promote failing
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: kash at tripleback.net

I'm experiencing lock-up of the ZFS system when doing a specific command
sequence. It is reproducible.

pool structure:

tank/vol/vol1 at 1
tank/vol/vol2 at 1
tank/grp/grp1 at a, b, c
tank/grp/grp2 at a, b, c

Any object under /vol/ and /grp/ are ZVOLs, grp's are clones vol at 1.

The commands:

zfs rename tank/vol/vol1 at 1 tank/vol/vol1 at YYYY-MM-DD
zfs rename tank/vol/vol1 tank/trash/YYYY-MM-DD_vol1
zfs rename tank/grp/grp1 tank/vol/vol1
zfs promote tank/vol/vol1
*hangs*

next command:
zfs snapshot tank/vol/vol at 1



I can't use 'zfs list' during this time, it is hung:

82867  -  I        0:00.00 sh -c zfs ...
82870  -  I        0:00.01 sudo zfs promote tank/iscsi/volumes/dfh
82871  -  D        0:00.01 zfs promote tank/iscsi/volumes/dfh
82919  -  I        0:00.01 sudo zfs get -H -o value available
82920  -  D        0:00.00 zfs get -H -o value available

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