Disable 3 test cases

The following three test cases occasionally fail the automated
testing.  For the moment disable these test cases until the
underlying issues can be fully investigated and resolved.

zfs_destroy_010_pos - openzfs#5893
rsend_020_pos       - openzfs#6086 (32-bit only)
send-c_volume       - openzfs#6087 (32-bit only)

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

tests/runfiles/linux.run

@@ -102,12 +102,13 @@ tests = ['zfs_create_001_pos', 'zfs_create_002_pos', 'zfs_create_003_pos',
 # DISABLED:
 # zfs_destroy_005_neg - busy mountpoint behavior
 # zfs_destroy_001_pos - https://github.com/zfsonlinux/zfs/issues/5635
+# zfs_destroy_010_pos - https://github.com/zfsonlinux/zfs/issues/5893
 [tests/functional/cli_root/zfs_destroy]
 tests = ['zfs_destroy_002_pos', 'zfs_destroy_003_pos',
-    'zfs_destroy_004_pos','zfs_destroy_006_neg', 'zfs_destroy_007_neg',
-    'zfs_destroy_008_pos','zfs_destroy_009_pos', 'zfs_destroy_010_pos',
-    'zfs_destroy_011_pos','zfs_destroy_012_pos', 'zfs_destroy_013_neg',
-    'zfs_destroy_014_pos','zfs_destroy_015_pos', 'zfs_destroy_016_pos']
+    'zfs_destroy_004_pos', 'zfs_destroy_006_neg', 'zfs_destroy_007_neg',
+    'zfs_destroy_008_pos', 'zfs_destroy_009_pos',
+    'zfs_destroy_011_pos', 'zfs_destroy_012_pos', 'zfs_destroy_013_neg',
+    'zfs_destroy_014_pos', 'zfs_destroy_015_pos', 'zfs_destroy_016_pos']
 
 # DISABLED:
 # zfs_get_004_pos - https://github.com/zfsonlinux/zfs/issues/3484

tests/zfs-tests/tests/functional/rsend/rsend_019_pos.ksh

@@ -35,6 +35,11 @@
 
 verify_runnable "both"
 
+# See issue: https://github.com/zfsonlinux/zfs/issues/6086
+if is_32bit; then
+	log_unsupported "Test case occasionally fails on 32-bit systems"
+fi
+
 log_assert "Verify resumability of a full and incremental ZFS send/receive " \
     "in the presence of a corrupted stream"
 log_onexit resume_cleanup $sendfs $streamfs

tests/zfs-tests/tests/functional/rsend/send-c_volume.ksh

@@ -35,6 +35,11 @@ function cleanup
 
 verify_runnable "both"
 
+# See issue: https://github.com/zfsonlinux/zfs/issues/6087
+if is_32bit; then
+	log_unsupported "Test case occasionally fails on 32-bit systems"
+fi
+
 log_assert "Verify compressed send works with volumes"
 log_onexit cleanup