Fix vdev_rebuild_thread deadlock

The metaslab_disable() call may block waiting for a txg sync.
Therefore it's important that vdev_rebuild_thread release the
SCL_CONFIG read lock it is holding before this call.  Failure
to do so can result in the txg_sync thread getting blocked
waiting for this lock which results in a deadlock.

Reviewed-by: Mark Maybee <[email protected]>
Reviewd-by: Srikanth N S <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #11647 

0 files changed, 0 insertions, 0 deletions