diff --git a/tests/zfs-tests/include/blkdev.shlib b/tests/zfs-tests/include/blkdev.shlib
index 2269131a45..e459e9e46a 100644
--- a/tests/zfs-tests/include/blkdev.shlib
+++ b/tests/zfs-tests/include/blkdev.shlib
@@ -577,6 +577,11 @@ function corrupt_blocks_at_level # input_file corrupt_level
 
 	[[ -f $input_file ]] || log_fail "Couldn't find $input_file"
 
+	if is_freebsd; then
+		# Temporarily allow corrupting an inuse device.
+		debugflags=$(sysctl -n kern.geom.debugflags)
+		sysctl kern.geom.debugflags=16
+	fi
 
 	log_must list_file_blocks $input_file | \
 	    while read level path offset length; do
@@ -586,6 +591,10 @@ function corrupt_blocks_at_level # input_file corrupt_level
 		fi
 	    done
 
+	if is_freebsd; then
+		sysctl kern.geom.debugflags=$debugflags
+	fi
+
 	# This is necessary for pools made of loop devices.
 	sync
 }
diff --git a/tests/zfs-tests/include/commands.cfg b/tests/zfs-tests/include/commands.cfg
index 71b05dda0c..4498f1a530 100644
--- a/tests/zfs-tests/include/commands.cfg
+++ b/tests/zfs-tests/include/commands.cfg
@@ -113,6 +113,7 @@ export SYSTEM_FILES_COMMON='arp
 
 export SYSTEM_FILES_FREEBSD='chflags
     compress
+    diskinfo
     dumpon
     env
     fsck
diff --git a/tests/zfs-tests/tests/functional/checksum/filetest_001_pos.ksh b/tests/zfs-tests/tests/functional/checksum/filetest_001_pos.ksh
index 27dad07263..0cad8047cd 100755
--- a/tests/zfs-tests/tests/functional/checksum/filetest_001_pos.ksh
+++ b/tests/zfs-tests/tests/functional/checksum/filetest_001_pos.ksh
@@ -54,9 +54,7 @@ verify_runnable "both"
 
 function cleanup
 {
-	echo cleanup
-	[[ -e $TESTDIR ]] && \
-		log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+	rm -fr $TESTDIR/*
 }
 
 log_assert "Create and read back files with using different checksum algorithms"
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_import/import_rewind_device_replaced.ksh b/tests/zfs-tests/tests/functional/cli_root/zpool_import/import_rewind_device_replaced.ksh
index 9a2f0c6730..94d1cb25d1 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_import/import_rewind_device_replaced.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_import/import_rewind_device_replaced.ksh
@@ -60,7 +60,7 @@ ZFS_TXG_TIMEOUT=""
 function custom_cleanup
 {
 	# Revert zfs_txg_timeout to defaults
-	[[ -n ZFS_TXG_TIMEOUT ]] &&
+	[[ -n $ZFS_TXG_TIMEOUT ]] &&
 	    log_must set_zfs_txg_timeout $ZFS_TXG_TIMEOUT
 	log_must rm -rf $BACKUP_DEVICE_DIR
 	log_must set_tunable32 SCAN_SUSPEND_PROGRESS 0
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import.kshlib b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import.kshlib
index 201c3803ae..48794c982c 100644
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import.kshlib
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import.kshlib
@@ -346,42 +346,11 @@ function set_zfs_max_missing_tvds
 }
 
 #
-# Use mdb to find the last txg that was synced in an active pool.
+# Use zdb to find the last txg that was synced in an active pool.
 #
 function get_last_txg_synced
 {
 	typeset pool=$1
 
-	if is_linux; then
-		txg=$(tail "/proc/spl/kstat/zfs/$pool/txgs" |
-		    awk '$3=="C" {print $1}' | tail -1)
-		[[ "$txg" ]] || txg=0
-		echo $txg
-		return 0
-	fi
-
-	typeset spas
-	spas=$(mdb -k -e "::spa")
-	[[ $? -ne 0 ]] && return 1
-
-	typeset spa=""
-	print "$spas\n" | while read line; do
-		typeset poolname=$(echo "$line" | awk '{print $3}')
-		typeset addr=$(echo "$line" | awk '{print $1}')
-		if [[ $poolname == $pool ]]; then
-			spa=$addr
-			break
-		fi
-	done
-	if [[ -z $spa ]]; then
-		log_fail "Couldn't find pool '$pool'"
-		return 1
-	fi
-	typeset mdbcmd="$spa::print spa_t spa_ubsync.ub_txg | ::eval '.=E'"
-	typeset -i txg
-	txg=$(mdb -k -e "$mdbcmd")
-	[[ $? -ne 0 ]] && return 1
-
-	echo $txg
-	return 0
+	zdb -u $pool | awk '$1 == "txg" { print $3 }' | sort -n | tail -n 1
 }
diff --git a/tests/zfs-tests/tests/functional/history/history.cfg b/tests/zfs-tests/tests/functional/history/history.cfg
index bbbd612a66..e9200a2b50 100644
--- a/tests/zfs-tests/tests/functional/history/history.cfg
+++ b/tests/zfs-tests/tests/functional/history/history.cfg
@@ -37,7 +37,11 @@ export TMP_HISTORY=$TEST_BASE_DIR/tmp_history.$$
 export NEW_HISTORY=$TEST_BASE_DIR/new_history.$$
 
 export MIGRATEDPOOLNAME=${MIGRATEDPOOLNAME:-history_pool}
-export TIMEZONE=${TIMEZONE:-US/Mountain}
+if is_freebsd; then
+	export TIMEZONE=${TIMEZONE:-America/Denver}
+else
+	export TIMEZONE=${TIMEZONE:-US/Mountain}
+fi
 
 export HIST_USER="huser"
 export HIST_GROUP="hgroup"
diff --git a/tests/zfs-tests/tests/functional/large_files/large_files_002_pos.ksh b/tests/zfs-tests/tests/functional/large_files/large_files_002_pos.ksh
index f4d4e5afbb..b9289ed5ea 100755
--- a/tests/zfs-tests/tests/functional/large_files/large_files_002_pos.ksh
+++ b/tests/zfs-tests/tests/functional/large_files/large_files_002_pos.ksh
@@ -49,7 +49,11 @@ log_must rm $TESTDIR/ulimit_write_file $TESTDIR/ulimit_trunc_file
 # Verify 'ulimit -f <size>' works
 log_must ulimit -f 1024
 log_mustnot sh -c 'dd if=/dev/zero of=$TESTDIR/ulimit_write_file bs=1M count=2'
-log_mustnot sh -c 'truncate -s2M $TESTDIR/ulimit_trunc_file'
-log_must rm $TESTDIR/ulimit_write_file $TESTDIR/ulimit_trunc_file
+log_must rm $TESTDIR/ulimit_write_file
+# FreeBSD allows the sparse file because space has not been allocated.
+if !is_freebsd; then
+	log_mustnot sh -c 'truncate -s2M $TESTDIR/ulimit_trunc_file'
+	log_must rm $TESTDIR/ulimit_trunc_file
+fi
 
 log_pass "Successfully enforced 'ulimit -f' maximum file size"
diff --git a/tests/zfs-tests/tests/functional/removal/removal_cancel.ksh b/tests/zfs-tests/tests/functional/removal/removal_cancel.ksh
index fdcaef6352..e97dc5e77a 100755
--- a/tests/zfs-tests/tests/functional/removal/removal_cancel.ksh
+++ b/tests/zfs-tests/tests/functional/removal/removal_cancel.ksh
@@ -66,21 +66,16 @@ log_must randwritecomp $SAMPLEFILE 25000
 #
 log_must zpool add -f $TESTPOOL $NOTREMOVEDISK
 
-#
-# Start removal.
-#
-log_must zpool remove $TESTPOOL $REMOVEDISK
-
-#
-# Sleep a bit and hopefully allow removal to copy some data.
-#
-log_must sleep 1
-
 #
 # Block removal.
 #
 log_must set_tunable32 REMOVAL_SUSPEND_PROGRESS 1
 
+#
+# Start removal.
+#
+log_must zpool remove $TESTPOOL $REMOVEDISK
+
 #
 # Only for debugging purposes in test logs.
 #
diff --git a/tests/zfs-tests/tests/functional/resilver/resilver_restart_001.ksh b/tests/zfs-tests/tests/functional/resilver/resilver_restart_001.ksh
index 6c37dc4e57..0a51f1ef24 100755
--- a/tests/zfs-tests/tests/functional/resilver/resilver_restart_001.ksh
+++ b/tests/zfs-tests/tests/functional/resilver/resilver_restart_001.ksh
@@ -70,9 +70,10 @@ function verify_restarts # <msg> <cnt> <defer>
 	[[ -z "$defer" ]] && return
 
 	# use zdb to find which vdevs have the resilver defer flag
-	VDEV_DEFERS=$(zdb -C $TESTPOOL | \
-	    sed -n -e '/^ *children\[[0-9]\].*$/{h}' \
-	    -e '/ *com.datto:resilver_defer$/{g;p}')
+	VDEV_DEFERS=$(zdb -C $TESTPOOL | awk '
+	    /children/ { gsub(/[^0-9]/, ""); child = $0 }
+	    /com\.datto:resilver_defer$/ { print child }
+	')
 
 	if [[ "$defer" == "-" ]]
 	then
@@ -81,7 +82,7 @@ function verify_restarts # <msg> <cnt> <defer>
 		return
 	fi
 
-	[[ "x${VDEV_DEFERS}x" =~ "x +children[$defer]:x" ]] ||
+	[[ $VDEV_DEFERS -eq $defer ]] ||
 	    log_fail "resilver deferred set on unexpected vdev: $VDEV_DEFERS"
 }