diff --git a/tests/zfs-tests/tests/functional/reservation/reservation_004_pos.sh b/tests/zfs-tests/tests/functional/reservation/reservation_004_pos.sh
index 2d0054b2c183..a396aae4b07d 100755
--- a/tests/zfs-tests/tests/functional/reservation/reservation_004_pos.sh
+++ b/tests/zfs-tests/tests/functional/reservation/reservation_004_pos.sh
@@ -56,7 +56,7 @@ verify_runnable "both"
 function cleanup {
 
 	for obj in $OBJ_LIST; do
-		datasetexists $obj && log_must zfs destroy -f $obj
+		datasetexists $obj && log_must_busy zfs destroy -f $obj
 	done
 }
 
@@ -112,7 +112,7 @@ for obj in $OBJ_LIST ; do
 		"($resv_size_set != $resv_size_get)"
 	fi
 
-	log_must zfs destroy -f $obj
+	log_must_busy zfs destroy -f $obj
 
 	new_space_avail=`get_prop available $TESTPOOL`
 	new_space_used=`get_prop used $TESTPOOL`
diff --git a/tests/zfs-tests/tests/functional/rsend/rsend.kshlib b/tests/zfs-tests/tests/functional/rsend/rsend.kshlib
index fde4123be872..6e2f2ce6fafe 100644
--- a/tests/zfs-tests/tests/functional/rsend/rsend.kshlib
+++ b/tests/zfs-tests/tests/functional/rsend/rsend.kshlib
@@ -119,13 +119,13 @@ function cleanup_pool
 	log_must rm -rf $BACKDIR/*
 
 	if is_global_zone ; then
-		log_must zfs destroy -Rf $pool
+		log_must_busy zfs destroy -Rf $pool
 	else
 		typeset list=$(zfs list -H -r -t all -o name $pool)
 		for ds in $list ; do
 			if [[ $ds != $pool ]] ; then
 				if datasetexists $ds ; then
-					log_must zfs destroy -Rf $ds
+					log_must_busy zfs destroy -Rf $ds
 				fi
 			fi
 		done
@@ -296,24 +296,16 @@ function destroy_tree
 	typeset -i ret=0
 	typeset snap
 	for snap in "$@" ; do
-		zfs destroy $snap
-		ret=$?
+		log_must_busy zfs destroy $snap
 
 		typeset ds=${snap%%@*}
 		typeset type=$(get_prop "type" $ds)
 		if [[ $type == "filesystem" ]]; then
 			typeset mntpnt=$(get_prop mountpoint $ds)
-			((ret |= $?))
-
-			if ((ret != 0)); then
-				rm -r $mntpnt/$snap
-				((ret |= $?))
+			if [[ -n $mntpnt ]]; then
+				rm -rf $mntpnt/$snap
 			fi
 		fi
-
-		if ((ret != 0)); then
-			return $ret
-		fi
 	done
 
 	return 0
@@ -516,8 +508,8 @@ function test_fs_setup
 	typeset sendpool=${sendfs%%/*}
 	typeset recvpool=${recvfs%%/*}
 
-	datasetexists $sendfs && log_must zfs destroy -r $sendpool
-	datasetexists $recvfs && log_must zfs destroy -r $recvpool
+	datasetexists $sendfs && log_must_busy zfs destroy -r $sendpool
+	datasetexists $recvfs && log_must_busy zfs destroy -r $recvpool
 
 	if $(datasetexists $sendfs || zfs create -o compress=lz4 $sendfs); then
 		mk_files 1000 256 0 $sendfs &
@@ -547,7 +539,7 @@ function test_fs_setup
 	fi
 
 	if datasetexists $streamfs; then
-		log_must zfs destroy -r $streamfs
+		log_must_busy zfs destroy -r $streamfs
 	fi
 	log_must zfs create -o compress=lz4 $sendpool/stream
 }
@@ -664,8 +656,8 @@ function resume_cleanup
 	typeset sendfs=$1
 	typeset streamfs=$2
 
-	datasetexists $sendfs && log_must zfs destroy -r $sendfs
-	datasetexists $streamfs && log_must zfs destroy -r $streamfs
+	datasetexists $sendfs && log_must_busy zfs destroy -r $sendfs
+	datasetexists $streamfs && log_must_busy zfs destroy -r $streamfs
 	cleanup_pool $POOL2
 	rm -f /$POOL/initial.zsend /$POOL/incremental.zsend
 }
diff --git a/tests/zfs-tests/tests/functional/rsend/rsend_003_pos.ksh b/tests/zfs-tests/tests/functional/rsend/rsend_003_pos.ksh
index 11d48ef0dc8d..2ace6737b14e 100755
--- a/tests/zfs-tests/tests/functional/rsend/rsend_003_pos.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/rsend_003_pos.ksh
@@ -59,7 +59,7 @@ if is_global_zone ; then
 	#
 	log_must eval "zfs send -I $POOL2@psnap $POOL2/pclone@final > " \
 		"$BACKDIR/pool-clone-I"
-	log_must zfs destroy -rf $POOL2/pclone
+	log_must_busy zfs destroy -rf $POOL2/pclone
 	log_must eval "zfs receive -d -F $POOL2 < $BACKDIR/pool-clone-I"
 	log_must cmp_ds_subs $POOL $POOL2
 	log_must cmp_ds_cont $POOL $POOL2
@@ -73,7 +73,7 @@ dstds=$(get_dst_ds $POOL $POOL2)
 ds=$dstds/$FS/fs1
 log_must eval "zfs send -I $ds/fs2@fsnap $ds/fclone@final > " \
 	"$BACKDIR/fs-clone-I"
-log_must zfs destroy -rf $ds/fclone
+log_must_busy zfs destroy -rf $ds/fclone
 log_must eval "zfs receive -F $ds/fclone < $BACKDIR/fs-clone-I"
 
 log_must cmp_ds_subs $POOL $dstds
@@ -86,7 +86,7 @@ if is_global_zone ; then
 	ds=$POOL2/$FS
 	log_must eval "zfs send -I $ds/vol@vsnap $ds/vclone@final > " \
 		"$BACKDIR/vol-clone-I"
-	log_must zfs destroy -rf $ds/vclone
+	log_must_busy zfs destroy -rf $ds/vclone
 	log_must eval "zfs receive -d -F $POOL2 < $BACKDIR/vol-clone-I"
 	log_must cmp_ds_subs $POOL $POOL2
 	log_must cmp_ds_cont $POOL $POOL2
diff --git a/tests/zfs-tests/tests/functional/rsend/rsend_009_pos.ksh b/tests/zfs-tests/tests/functional/rsend/rsend_009_pos.ksh
index 1578283fc707..7d858d92d511 100755
--- a/tests/zfs-tests/tests/functional/rsend/rsend_009_pos.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/rsend_009_pos.ksh
@@ -48,10 +48,10 @@ verify_runnable "global"
 function cleanup
 {
 	if datasetexists bpool ; then
-		log_must zpool destroy -f bpool
+		log_must_busy zpool destroy -f bpool
 	fi
 	if datasetexists spool ; then
-		log_must zpool destroy -f spool
+		log_must_busy zpool destroy -f spool
 	fi
 }
 
@@ -80,7 +80,7 @@ log_must ismounted spool
 # Test out of space on top filesystem
 #
 log_must mv /bpool/fs/file /bpool
-log_must zfs destroy -rf bpool/fs
+log_must_busy zfs destroy -rf bpool/fs
 
 log_must zfs snapshot bpool@snap
 log_must eval "zfs send -R bpool@snap > $BACKDIR/bpool-R"
diff --git a/tests/zfs-tests/tests/functional/rsend/rsend_011_pos.ksh b/tests/zfs-tests/tests/functional/rsend/rsend_011_pos.ksh
index 3b6cc29372c0..9ecd18d87da6 100755
--- a/tests/zfs-tests/tests/functional/rsend/rsend_011_pos.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/rsend_011_pos.ksh
@@ -45,9 +45,6 @@ verify_runnable "both"
 
 function cleanup
 {
-	export __ZFS_POOL_RESTRICT="$POOL $POOL2"
-	log_must zfs unmount -a
-	unset __ZFS_POOL_RESTRICT
 	log_must cleanup_pool $POOL
 	log_must cleanup_pool $POOL2
 
diff --git a/tests/zfs-tests/tests/functional/rsend/rsend_013_pos.ksh b/tests/zfs-tests/tests/functional/rsend/rsend_013_pos.ksh
index 80644ee20930..110e56144674 100755
--- a/tests/zfs-tests/tests/functional/rsend/rsend_013_pos.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/rsend_013_pos.ksh
@@ -66,11 +66,11 @@ cleanup
 log_must eval "zfs send -R $POOL@final > $BACKDIR/pool-final-R"
 log_must eval "zfs receive -dF $POOL2 < $BACKDIR/pool-final-R"
 
-log_must zfs destroy -Rf $POOL/$FS
-log_must zfs destroy -Rf $POOL/pclone
+log_must_busy zfs destroy -Rf $POOL/$FS
+log_must_busy zfs destroy -Rf $POOL/pclone
 
 if is_global_zone ; then
-	log_must zfs destroy -Rf $POOL/vol
+	log_must_busy zfs destroy -Rf $POOL/vol
 fi
 log_must zfs snapshot -r $POOL@destroy
 
diff --git a/tests/zfs-tests/tests/functional/rsend/rsend_020_pos.ksh b/tests/zfs-tests/tests/functional/rsend/rsend_020_pos.ksh
index 29bdc4f840dd..9f1530b45500 100755
--- a/tests/zfs-tests/tests/functional/rsend/rsend_020_pos.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/rsend_020_pos.ksh
@@ -33,6 +33,11 @@
 
 verify_runnable "both"
 
+# See issue: https://github.com/zfsonlinux/zfs/issues/6446
+if is_linux; then
+	log_unsupported "Test often hangs. Skipping."
+fi
+
 log_assert "Verify resumability of full ZFS send/receive with the -D " \
     "(dedup) flag"
 
diff --git a/tests/zfs-tests/tests/functional/rsend/rsend_021_pos.ksh b/tests/zfs-tests/tests/functional/rsend/rsend_021_pos.ksh
index d74844890a92..54d56c9a69a4 100755
--- a/tests/zfs-tests/tests/functional/rsend/rsend_021_pos.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/rsend_021_pos.ksh
@@ -35,6 +35,11 @@
 
 verify_runnable "both"
 
+# See issue: https://github.com/zfsonlinux/zfs/issues/6446
+if is_linux; then
+	log_unsupported "Test often hangs. Skipping."
+fi
+
 log_assert "Verify resumability of a full and incremental ZFS send/receive " \
     "with the -e (embedded) flag"
 
diff --git a/tests/zfs-tests/tests/functional/rsend/rsend_022_pos.ksh b/tests/zfs-tests/tests/functional/rsend/rsend_022_pos.ksh
index 487a01426b07..ff51fecafc42 100755
--- a/tests/zfs-tests/tests/functional/rsend/rsend_022_pos.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/rsend_022_pos.ksh
@@ -54,10 +54,10 @@ log_onexit resume_cleanup $sendfs $streamfs
 
 test_fs_setup $sendfs $recvfs
 log_must zfs bookmark $sendfs@a $sendfs#bm_a
-log_must zfs destroy $sendfs@a
+log_must_busy zfs destroy $sendfs@a
 log_must zfs receive -v $recvfs </$POOL/initial.zsend
 resume_test "zfs send -i \#bm_a $sendfs@b" $streamfs $recvfs
-log_must zfs destroy -r -f $sendfs
+log_must_busy zfs destroy -r -f $sendfs
 log_must zfs receive -v $sendfs </$POOL/initial.zsend
 log_must zfs receive -v $sendfs </$POOL/incremental.zsend
 file_check $sendfs $recvfs
diff --git a/tests/zfs-tests/tests/functional/rsend/rsend_024_pos.ksh b/tests/zfs-tests/tests/functional/rsend/rsend_024_pos.ksh
index e7453a0e1ed2..bcea6b7286f7 100755
--- a/tests/zfs-tests/tests/functional/rsend/rsend_024_pos.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/rsend_024_pos.ksh
@@ -50,7 +50,7 @@ streamfs=$POOL/stream
 log_onexit resume_cleanup $sendfs $streamfs
 
 test_fs_setup $sendfs $recvfs
-log_must zfs unmount $sendfs
+log_must zfs unmount -f $sendfs
 resume_test "zfs send $sendfs" $streamfs $recvfs
 file_check $sendfs $recvfs
 
diff --git a/tests/zfs-tests/tests/functional/rsend/send-c_lz4_disabled.ksh b/tests/zfs-tests/tests/functional/rsend/send-c_lz4_disabled.ksh
index 70e200bad121..666e11f702f8 100755
--- a/tests/zfs-tests/tests/functional/rsend/send-c_lz4_disabled.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/send-c_lz4_disabled.ksh
@@ -52,8 +52,8 @@ for compress in off gzip; do
 		poolexists $POOL3 && destroy_pool $POOL3
 		log_must zpool create $pool_opt $POOL3 $DISK3
 
-		datasetexists $send_ds && log_must zfs destroy -r $send_ds
-		datasetexists $recv_ds && log_must zfs destroy -r $recv_ds
+		datasetexists $send_ds && log_must_busy zfs destroy -r $send_ds
+		datasetexists $recv_ds && log_must_busy zfs destroy -r $recv_ds
 
 		log_must zfs create -o compress=$compress $send_ds
 		typeset dir=$(get_prop mountpoint $send_ds)
@@ -63,7 +63,7 @@ for compress in off gzip; do
 		log_must eval "zfs send -c $send_ds@full >$BACKDIR/full-c"
 		log_must eval "zfs recv $recv_ds <$BACKDIR/full-c"
 
-		log_must zfs destroy -r $recv_ds
+		log_must_busy zfs destroy -r $recv_ds
 
 		log_must eval "zfs send $send_ds@full >$BACKDIR/full"
 		log_must eval "zfs recv $recv_ds <$BACKDIR/full"
diff --git a/tests/zfs-tests/tests/functional/rsend/send-c_recv_lz4_disabled.ksh b/tests/zfs-tests/tests/functional/rsend/send-c_recv_lz4_disabled.ksh
index 53c7ce8bd3ff..614394e5262b 100755
--- a/tests/zfs-tests/tests/functional/rsend/send-c_recv_lz4_disabled.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/send-c_recv_lz4_disabled.ksh
@@ -50,8 +50,8 @@ datasetexists $POOL3 && log_must zpool destroy $POOL3
 log_must zpool create -d $POOL3 $DISK3
 
 for compress in $compress_types; do
-	datasetexists $send_ds && log_must zfs destroy -r $send_ds
-	datasetexists $recv_ds && log_must zfs destroy -r $recv_ds
+	datasetexists $send_ds && log_must_busy zfs destroy -r $send_ds
+	datasetexists $recv_ds && log_must_busy zfs destroy -r $recv_ds
 
 	log_must zfs create -o compress=$compress $send_ds
 	typeset dir=$(get_prop mountpoint $send_ds)
diff --git a/tests/zfs-tests/tests/functional/rsend/send-c_stream_size_estimate.ksh b/tests/zfs-tests/tests/functional/rsend/send-c_stream_size_estimate.ksh
index e810f712afa0..3677db83f192 100755
--- a/tests/zfs-tests/tests/functional/rsend/send-c_stream_size_estimate.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/send-c_stream_size_estimate.ksh
@@ -56,8 +56,8 @@ log_onexit cleanup_pool $POOL2
 write_compressible $BACKDIR ${megs}m
 
 for compress in $compress_types; do
-	datasetexists $send_ds && log_must zfs destroy -r $send_ds
-	datasetexists $send_vol && log_must zfs destroy -r $send_vol
+	datasetexists $send_ds && log_must_busy zfs destroy -r $send_ds
+	datasetexists $send_vol && log_must_busy zfs destroy -r $send_vol
 	log_must zfs create -o compress=$compress $send_ds
 	log_must zfs create -V 1g -o compress=$compress $send_vol
 
diff --git a/tests/zfs-tests/tests/functional/rsend/send-c_verify_ratio.ksh b/tests/zfs-tests/tests/functional/rsend/send-c_verify_ratio.ksh
index 17bf1f7c09c0..9b886f81572c 100755
--- a/tests/zfs-tests/tests/functional/rsend/send-c_verify_ratio.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/send-c_verify_ratio.ksh
@@ -59,7 +59,7 @@ for prop in $(get_rand_compress_any 6); do
 		verify_stream_size $BACKDIR/compressed $sendfs
 
 		log_must rm $BACKDIR/uncompressed $BACKDIR/compressed
-		log_must zfs destroy -r $sendfs
+		log_must_busy zfs destroy -r $sendfs
 	done
 done
 
diff --git a/tests/zfs-tests/tests/functional/rsend/send-c_volume.ksh b/tests/zfs-tests/tests/functional/rsend/send-c_volume.ksh
index 903cefd57d8e..d2f8c51d1243 100755
--- a/tests/zfs-tests/tests/functional/rsend/send-c_volume.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/send-c_volume.ksh
@@ -29,7 +29,7 @@
 
 function cleanup
 {
-	log_must zfs destroy -r $vol
+	log_must_busy zfs destroy -r $vol
 	cleanup_pool $POOL2
 }
 
diff --git a/tests/zfs-tests/tests/functional/rsend/send-cpL_varied_recsize.ksh b/tests/zfs-tests/tests/functional/rsend/send-cpL_varied_recsize.ksh
index ee7421d083a9..84c0a5e3c3d3 100755
--- a/tests/zfs-tests/tests/functional/rsend/send-cpL_varied_recsize.ksh
+++ b/tests/zfs-tests/tests/functional/rsend/send-cpL_varied_recsize.ksh
@@ -55,8 +55,8 @@ verify_runnable "both"
 
 function cleanup
 {
-	datasetexists $TESTPOOL/128k && log_must zfs destroy $TESTPOOL/128k
-	datasetexists $TESTPOOL/1m && log_must zfs destroy $TESTPOOL/1m
+	datasetexists $TESTPOOL/128k && log_must_busy zfs destroy $TESTPOOL/128k
+	datasetexists $TESTPOOL/1m && log_must_busy zfs destroy $TESTPOOL/1m
 	cleanup_pool $POOL2
 	destroy_pool $POOL3
 }
@@ -153,7 +153,7 @@ function check
 
 	check_recsize $recv_ds $expected_file_bs $expected_recsize
 	$do_size_test && verify_stream_size $stream $recv_ds
-	log_must zfs destroy -r $recv_ds
+	log_must_busy zfs destroy -r $recv_ds
 }
 
 log_assert "Verify compressed send works with datasets of varying recsize."