Skip async_destroy_001_pos on 32-bit systems

The async_destroy_001_pos test case currently hangs when testing on
a 32-bit system.  Conditionally skip this test case on 32-bit
systems until the root cause is identified and resolved.

Reviewed-by: Tom Caputi <tcaputi@datto.com>
Reviewed-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #5352
Issue #5347

tests/zfs-tests/include/libtest.shlib

@@ -44,6 +44,19 @@ function is_linux
 	fi
 }
 
+# Determine if this is a 32-bit system
+#
+# Return 0 if platform is 32-bit, 1 if otherwise
+
+function is_32bit
+{
+	if [[ $(getconf LONG_BIT) == "32" ]]; then
+		return 0
+	else
+		return 1
+	fi
+}
+
 # Determine whether a dataset is mounted
 #
 # $1 dataset name

tests/zfs-tests/tests/functional/features/async_destroy/setup.ksh

@@ -31,6 +31,10 @@
 
 . $STF_SUITE/include/libtest.shlib
 
+if is_32bit; then
+	log_unsupported "Test case fails on 32-bit systems"
+fi
+
 DISK=${DISKS%% *}
 
 default_setup $DISK