From 6b42ea85903b5d96eddbe364e71636e6802d8da0 Mon Sep 17 00:00:00 2001
From: Paul Dagnelie <pcd@delphix.com>
Date: Fri, 5 Feb 2016 13:47:48 -0800
Subject: [PATCH] Illumos 5809 - Blowaway full receive in v1 pool causes kernel
 panic

5809 Blowaway full receive in v1 pool causes kernel panic
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Alex Reece <alex@delphix.com>
Reviewed by: Will Andrews <will@freebsd.org>
Approved by: Gordon Ross <gwr@nexenta.com>

References:
  https://www.illumos.org/issues/5809
  https://github.com/illumos/illumos-gate/commit/f40b29c

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
---
 module/zfs/dmu_send.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/module/zfs/dmu_send.c b/module/zfs/dmu_send.c
index 88d27c867..6585e4778 100644
--- a/module/zfs/dmu_send.c
+++ b/module/zfs/dmu_send.c
@@ -1350,7 +1350,8 @@ dmu_recv_begin_sync(void *arg, dmu_tx_t *tx)
 		}
 		dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name,
 		    snap, crflags, drba->drba_cred, tx);
-		dsl_dataset_rele(snap, FTAG);
+		if (drba->drba_snapobj != 0)
+			dsl_dataset_rele(snap, FTAG);
 		dsl_dataset_rele(ds, FTAG);
 	} else {
 		dsl_dir_t *dd;