Kernel commit c9eb13a fixed this bug:
ext4: fix hang when processing corrupted orphaned inode list
Bug description:
If the orphaned inode list contains inode #5, ext4_iget()
returns a bad inode (since the bootloader inode should never
be referenced directly). Because of the bad inode, we end up
processing the inode repeatedly and this hangs the machine.
Test description:
We manually set the superblock field last_orphan to 1~10
(although the bug only happens when last_orphan is set to 5
it is better to test all reserved inode numbers 1~10 here)
and mount the fs in a loop to trigger the bug.
Signed-off-by: Guangwen Feng <fenggw-fnst@xxxxxxxxxxxxxx>
---
common/config | 1 +
tests/shared/004 | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++
tests/shared/004.out | 2 ++
tests/shared/group | 1 +
4 files changed, 68 insertions(+)
create mode 100755 tests/shared/004
create mode 100644 tests/shared/004.out
diff --git a/common/config b/common/config
index cacd815..c25b1ec 100644
--- a/common/config
+++ b/common/config
@@ -195,6 +195,7 @@ export DUMP_PROG="`set_prog_path dump`"
export RESTORE_PROG="`set_prog_path restore`"
export LVM_PROG="`set_prog_path lvm`"
export CHATTR_PROG="`set_prog_path chattr`"
+export DEBUGFS_PROG="`set_prog_path debugfs`"
# use 'udevadm settle' or 'udevsettle' to wait for lv to be settled.
# newer systems have udevadm command but older systems like RHEL5 don't.
diff --git a/tests/shared/004 b/tests/shared/004
new file mode 100755
index 0000000..b9eaa15
--- /dev/null
+++ b/tests/shared/004
@@ -0,0 +1,64 @@
+#! /bin/bash
+# FS QA Test 004
+#
+# Regression test for commit:
+# c9eb13a ext4: fix hang when processing corrupted orphaned inode list
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2016 Fujitsu. All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+#-----------------------------------------------------------------------
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+tmp=/tmp/$$
+status=1 # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+ cd /
+ rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+
+# real QA test starts here
+_supported_fs ext2 ext3 ext4
+_supported_os Linux
+_require_scratch
+_require_command "$DEBUGFS_PROG" debugfs
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+echo "Silence is golden"
+
+# although the bug only happens when last_orphan is set to 5
+# it is better to test all reserved inode numbers 1-10 here
+for i in {1..10}; do
+ # create smaller filesystems to save test time
+ _scratch_mkfs_sized $((16 * 1024 * 1024)) >>$seqres.full 2>&1
+ $DEBUGFS_PROG -w -R "ssv last_orphan $i" $SCRATCH_DEV >>$seqres.full 2>&1
+ _scratch_mount
+ _scratch_unmount
+done
+
+# success, all done
+status=0
+exit
diff --git a/tests/shared/004.out b/tests/shared/004.out
new file mode 100644
index 0000000..af8614a
--- /dev/null
+++ b/tests/shared/004.out
@@ -0,0 +1,2 @@
+QA output created by 004
+Silence is golden
diff --git a/tests/shared/group b/tests/shared/group
index ba8a3f0..55bb594 100644
--- a/tests/shared/group
+++ b/tests/shared/group
@@ -6,6 +6,7 @@
001 auto quick
002 auto metadata quick
003 auto quick
+004 auto quick
006 auto enospc
032 mkfs auto quick
051 acl udf auto quick
--
1.8.4.2
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