blob: abf8d4535a75a14f359de3b19ea5090c45d0de39 [file] [log] [blame]
From f3bbfb2eaaa985ae08cb4ffab34879d0d052483a Mon Sep 17 00:00:00 2001
From: Filipe Manana <>
Date: Wed, 18 Sep 2019 13:08:52 +0100
Subject: [PATCH] Btrfs: fix selftests failure due to uninitialized i_mode in
test inodes
commit 9f7fec0ba89108b9385f1b9fb167861224912a4a upstream.
Some of the self tests create a test inode, setup some extents and then do
calls to btrfs_get_extent() to test that the corresponding extent maps
exist and are correct. However btrfs_get_extent(), since the 5.2 merge
window, now errors out when it finds a regular or prealloc extent for an
inode that does not correspond to a regular file (its ->i_mode is not
S_IFREG). This causes the self tests to fail sometimes, specially when
KASAN, slub_debug and page poisoning are enabled:
$ modprobe btrfs
modprobe: ERROR: could not insert 'btrfs': Invalid argument
$ dmesg
[ 9414.691648] Btrfs loaded, crc32c=crc32c-intel, debug=on, assert=on, integrity-checker=on, ref-verify=on
[ 9414.692655] BTRFS: selftest: sectorsize: 4096 nodesize: 4096
[ 9414.692658] BTRFS: selftest: running btrfs free space cache tests
[ 9414.692918] BTRFS: selftest: running extent only tests
[ 9414.693061] BTRFS: selftest: running bitmap only tests
[ 9414.693366] BTRFS: selftest: running bitmap and extent tests
[ 9414.696455] BTRFS: selftest: running space stealing from bitmap to extent tests
[ 9414.697131] BTRFS: selftest: running extent buffer operation tests
[ 9414.697133] BTRFS: selftest: running btrfs_split_item tests
[ 9414.697564] BTRFS: selftest: running extent I/O tests
[ 9414.697583] BTRFS: selftest: running find delalloc tests
[ 9415.081125] BTRFS: selftest: running find_first_clear_extent_bit test
[ 9415.081278] BTRFS: selftest: running extent buffer bitmap tests
[ 9415.124192] BTRFS: selftest: running inode tests
[ 9415.124195] BTRFS: selftest: running btrfs_get_extent tests
[ 9415.127909] BTRFS: selftest: running hole first btrfs_get_extent test
[ 9415.128343] BTRFS critical (device (efault)): regular/prealloc extent found for non-regular inode 256
[ 9415.131428] BTRFS: selftest: fs/btrfs/tests/inode-tests.c:904 expected a real extent, got 0
This happens because the test inodes are created without ever initializing
the i_mode field of the inode, and neither VFS's new_inode() nor the btrfs
callback btrfs_alloc_inode() initialize the i_mode. Initialization of the
i_mode is done through the various callbacks used by the VFS to create
new inodes (regular files, directories, symlinks, tmpfiles, etc), which
all call btrfs_new_inode() which in turn calls inode_init_owner(), which
sets the inode's i_mode. Since the tests only uses new_inode() to create
the test inodes, the i_mode was never initialized.
This always happens on a VM I used with kasan, slub_debug and many other
debug facilities enabled. It also happened to someone who reported this
on bugzilla (on a 5.3-rc).
Fix this by setting i_mode to S_IFREG at btrfs_new_test_inode().
Fixes: 6bf9e4bd6a2778 ("btrfs: inode: Verify inode mode to avoid NULL pointer dereference")
Signed-off-by: Filipe Manana <>
Reviewed-by: Qu Wenruo <>
Signed-off-by: David Sterba <>
Signed-off-by: Paul Gortmaker <>
diff --git a/fs/btrfs/tests/btrfs-tests.c b/fs/btrfs/tests/btrfs-tests.c
index 9238fd4f1734..41f41540382e 100644
--- a/fs/btrfs/tests/btrfs-tests.c
+++ b/fs/btrfs/tests/btrfs-tests.c
@@ -48,7 +48,13 @@ static struct file_system_type test_type = {
struct inode *btrfs_new_test_inode(void)
- return new_inode(test_mnt->mnt_sb);
+ struct inode *inode;
+ inode = new_inode(test_mnt->mnt_sb);
+ if (inode)
+ inode_init_owner(inode, NULL, S_IFREG);
+ return inode;
static int btrfs_init_test_fs(void)