ZTS: Improve cleanup in zpool tests

* Restore original kern.corefile value after the test.
* Don't leave behind a frozen pool.
* Clean up leftover vdev files.
* Make zpool_002_pos and zpool_003_pos consistent in their handling of
core files while here.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #11694

tests/zfs-tests/tests/functional/cli_root/zpool/zpool_002_pos.ksh

@@ -47,31 +47,32 @@ function cleanup
 {
 	unset ZFS_ABORT
 
-	if [[ -d $corepath ]]; then
+	if is_freebsd && [ -n "$old_corefile" ]; then
-		rm -rf $corepath
+		sysctl kern.corefile=$old_corefile
 	fi
 
-	if poolexists $pool; then
+	# Clean up the pool created if we failed to abort.
-		log_must zpool destroy -f $pool
+	poolexists $pool && destroy_pool $pool
-	fi
+
+	rm -rf $corepath $vdev1 $vdev2 $vdev3
 }
 
 log_assert "With ZFS_ABORT set, all zpool commands can abort and generate a core file."
 log_onexit cleanup
 
-#preparation work for testing
 corepath=$TESTDIR/core
+corefile=$corepath/zpool.core
 if [[ -d $corepath ]]; then
-	rm -rf $corepath
+	log_must rm -rf $corepath
 fi
-mkdir $corepath
+log_must mkdir $corepath
 
 pool=pool.$$
 vdev1=$TESTDIR/file1
 vdev2=$TESTDIR/file2
 vdev3=$TESTDIR/file3
 for vdev in $vdev1 $vdev2 $vdev3; do
-	mkfile $MINVDEVSIZE $vdev
+	log_must mkfile $MINVDEVSIZE $vdev
 done
 
 set -A cmds "create $pool mirror $vdev1 $vdev2" "list $pool" "iostat $pool" \
@@ -86,22 +87,18 @@ set -A badparams "" "create" "destroy" "add" "remove" "list *" "iostat" "status"
 		"import" "export" "upgrade" "history -?" "get" "set"
 
 if is_linux; then
-	ulimit -c unlimited
+	echo $corefile >/proc/sys/kernel/core_pattern
-	echo "$corepath/core.zpool" >/proc/sys/kernel/core_pattern
 	echo 0 >/proc/sys/kernel/core_uses_pid
-	export ASAN_OPTIONS="abort_on_error=1:disable_coredump=0"
 elif is_freebsd; then
-	ulimit -c unlimited
+	old_corefile=$(sysctl -n kern.corefile)
-	log_must sysctl kern.corefile=$corepath/core.zpool
+	log_must sysctl kern.corefile=$corefile
-	export ASAN_OPTIONS="abort_on_error=1:disable_coredump=0"
-else
-	coreadm -p ${corepath}/core.%f
 fi
+ulimit -c unlimited
 
+export ASAN_OPTIONS="abort_on_error=1:disable_coredump=0"
 export ZFS_ABORT=yes
 
 for subcmd in "${cmds[@]}" "${badparams[@]}"; do
-	corefile=${corepath}/core.zpool
 	zpool $subcmd >/dev/null 2>&1
 	if [[ ! -e $corefile ]]; then
 		log_fail "zpool $subcmd cannot generate core file with ZFS_ABORT set."
@@ -109,4 +106,6 @@ for subcmd in "${cmds[@]}" "${badparams[@]}"; do
 	rm -f $corefile
 done
 
+unset ZFS_ABORT
+
 log_pass "With ZFS_ABORT set, zpool command can abort and generate core file as expected."

tests/zfs-tests/tests/functional/cli_root/zpool/zpool_003_pos.ksh

@@ -44,9 +44,17 @@
 
 function cleanup
 {
+	unset ZFS_ABORT
+
 	if is_freebsd && [ -n "$old_corefile" ]; then
 		sysctl kern.corefile=$old_corefile
 	fi
+
+	rm -rf $corepath
+
+	# Don't leave the pool frozen.
+	destroy_pool $TESTPOOL
+	default_mirror_setup $DISKS
 }
 
 verify_runnable "both"
@@ -54,7 +62,14 @@ verify_runnable "both"
 log_assert "Debugging features of zpool should succeed."
 log_onexit cleanup
 
-log_must zpool -? > /dev/null 2>&1
+corepath=$TESTDIR/core
+corefile=$corepath/zpool.core
+if [[ -d $corepath ]]; then
+	log_must rm -rf $corepath
+fi
+log_must mkdir $corepath
+
+log_must eval "zpool -? >/dev/null 2>&1"
 
 if is_global_zone ; then
 	log_must zpool freeze $TESTPOOL
@@ -65,26 +80,22 @@ fi
 
 log_mustnot zpool freeze fakepool
 
-# Remove corefile possibly left by previous failing run of this test.
-[[ -f core ]] && log_must rm -f core
-
 if is_linux; then
-	ulimit -c unlimited
+	echo $corefile >/proc/sys/kernel/core_pattern
-	echo "core" >/proc/sys/kernel/core_pattern
 	echo 0 >/proc/sys/kernel/core_uses_pid
-	export ASAN_OPTIONS="abort_on_error=1:disable_coredump=0"
 elif is_freebsd; then
-	ulimit -c unlimited
 	old_corefile=$(sysctl -n kern.corefile)
-	log_must sysctl kern.corefile=core
+	log_must sysctl kern.corefile=$corefile
-	export ASAN_OPTIONS="abort_on_error=1:disable_coredump=0"
 fi
+ulimit -c unlimited
+
+export ASAN_OPTIONS="abort_on_error=1:disable_coredump=0"
+export ZFS_ABORT=yes
+
+zpool >/dev/null 2>&1
 
-ZFS_ABORT=1; export ZFS_ABORT
-zpool > /dev/null 2>&1
 unset ZFS_ABORT
 
-[[ -f core ]] || log_fail "zpool did not dump core by request."
+[[ -f $corefile ]] || log_fail "zpool did not dump core by request."
-[[ -f core ]] && log_must rm -f core
 
 log_pass "Debugging features of zpool succeed."