[PATCH] f2fs: avoid false alarm of circular locking
From: Jaegeuk Kim
Date: Fri Aug 18 2023 - 20:54:12 EST
======================================================
WARNING: possible circular locking dependency detected
6.5.0-rc5-syzkaller-00353-gae545c3283dc #0 Not tainted
------------------------------------------------------
syz-executor273/5027 is trying to acquire lock:
ffff888077fe1fb0 (&fi->i_sem){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2133 [inline]
ffff888077fe1fb0 (&fi->i_sem){+.+.}-{3:3}, at: f2fs_add_inline_entry+0x300/0x6f0 fs/f2fs/inline.c:644
but task is already holding lock:
ffff888077fe07c8 (&fi->i_xattr_sem){.+.+}-{3:3}, at: f2fs_down_read fs/f2fs/f2fs.h:2108 [inline]
ffff888077fe07c8 (&fi->i_xattr_sem){.+.+}-{3:3}, at: f2fs_add_dentry+0x92/0x230 fs/f2fs/dir.c:783
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&fi->i_xattr_sem){.+.+}-{3:3}:
down_read+0x9c/0x470 kernel/locking/rwsem.c:1520
f2fs_down_read fs/f2fs/f2fs.h:2108 [inline]
f2fs_getxattr+0xb1e/0x12c0 fs/f2fs/xattr.c:532
__f2fs_get_acl+0x5a/0x900 fs/f2fs/acl.c:179
f2fs_acl_create fs/f2fs/acl.c:377 [inline]
f2fs_init_acl+0x15c/0xb30 fs/f2fs/acl.c:420
f2fs_init_inode_metadata+0x159/0x1290 fs/f2fs/dir.c:558
f2fs_add_regular_entry+0x79e/0xb90 fs/f2fs/dir.c:740
f2fs_add_dentry+0x1de/0x230 fs/f2fs/dir.c:788
f2fs_do_add_link+0x190/0x280 fs/f2fs/dir.c:827
f2fs_add_link fs/f2fs/f2fs.h:3554 [inline]
f2fs_mkdir+0x377/0x620 fs/f2fs/namei.c:781
vfs_mkdir+0x532/0x7e0 fs/namei.c:4117
do_mkdirat+0x2a9/0x330 fs/namei.c:4140
__do_sys_mkdir fs/namei.c:4160 [inline]
__se_sys_mkdir fs/namei.c:4158 [inline]
__x64_sys_mkdir+0xf2/0x140 fs/namei.c:4158
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #0 (&fi->i_sem){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3142 [inline]
check_prevs_add kernel/locking/lockdep.c:3261 [inline]
validate_chain kernel/locking/lockdep.c:3876 [inline]
__lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5144
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
down_write+0x93/0x200 kernel/locking/rwsem.c:1573
f2fs_down_write fs/f2fs/f2fs.h:2133 [inline]
f2fs_add_inline_entry+0x300/0x6f0 fs/f2fs/inline.c:644
f2fs_add_dentry+0xa6/0x230 fs/f2fs/dir.c:784
f2fs_do_add_link+0x190/0x280 fs/f2fs/dir.c:827
f2fs_add_link fs/f2fs/f2fs.h:3554 [inline]
f2fs_mkdir+0x377/0x620 fs/f2fs/namei.c:781
vfs_mkdir+0x532/0x7e0 fs/namei.c:4117
ovl_do_mkdir fs/overlayfs/overlayfs.h:196 [inline]
ovl_mkdir_real+0xb5/0x370 fs/overlayfs/dir.c:146
ovl_workdir_create+0x3de/0x820 fs/overlayfs/super.c:309
ovl_make_workdir fs/overlayfs/super.c:711 [inline]
ovl_get_workdir fs/overlayfs/super.c:864 [inline]
ovl_fill_super+0xdab/0x6180 fs/overlayfs/super.c:1400
vfs_get_super+0xf9/0x290 fs/super.c:1152
vfs_get_tree+0x88/0x350 fs/super.c:1519
do_new_mount fs/namespace.c:3335 [inline]
path_mount+0x1492/0x1ed0 fs/namespace.c:3662
do_mount fs/namespace.c:3675 [inline]
__do_sys_mount fs/namespace.c:3884 [inline]
__se_sys_mount fs/namespace.c:3861 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:3861
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
rlock(&fi->i_xattr_sem);
lock(&fi->i_sem);
lock(&fi->i_xattr_sem);
lock(&fi->i_sem);
Reported-and-tested-by: syzbot+e5600587fa9cbf8e3826@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 5eda1ad1aaff "f2fs: fix deadlock in i_xattr_sem and inode page lock"
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
fs/f2fs/f2fs.h | 24 +++++++++++++++---------
fs/f2fs/inline.c | 3 ++-
2 files changed, 17 insertions(+), 10 deletions(-)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index c602ff2403b6..c0b7417f1d87 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2122,15 +2122,6 @@ static inline int f2fs_down_read_trylock(struct f2fs_rwsem *sem)
return down_read_trylock(&sem->internal_rwsem);
}
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-static inline void f2fs_down_read_nested(struct f2fs_rwsem *sem, int subclass)
-{
- down_read_nested(&sem->internal_rwsem, subclass);
-}
-#else
-#define f2fs_down_read_nested(sem, subclass) f2fs_down_read(sem)
-#endif
-
static inline void f2fs_up_read(struct f2fs_rwsem *sem)
{
up_read(&sem->internal_rwsem);
@@ -2141,6 +2132,21 @@ static inline void f2fs_down_write(struct f2fs_rwsem *sem)
down_write(&sem->internal_rwsem);
}
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static inline void f2fs_down_read_nested(struct f2fs_rwsem *sem, int subclass)
+{
+ down_read_nested(&sem->internal_rwsem, subclass);
+}
+
+static inline void f2fs_down_write_nested(struct f2fs_rwsem *sem, int subclass)
+{
+ down_write_nested(&sem->internal_rwsem, subclass);
+}
+#else
+#define f2fs_down_read_nested(sem, subclass) f2fs_down_read(sem)
+#define f2fs_down_write_nested(sem, subclass) f2fs_down_write(sem)
+#endif
+
static inline int f2fs_down_write_trylock(struct f2fs_rwsem *sem)
{
return down_write_trylock(&sem->internal_rwsem);
diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index 4638fee16a91..0d185ad5e469 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -641,7 +641,8 @@ int f2fs_add_inline_entry(struct inode *dir, const struct f2fs_filename *fname,
}
if (inode) {
- f2fs_down_write(&F2FS_I(inode)->i_sem);
+ f2fs_down_write_nested(&F2FS_I(inode)->i_sem,
+ SINGLE_DEPTH_NESTING);
page = f2fs_init_inode_metadata(inode, dir, fname, ipage);
if (IS_ERR(page)) {
err = PTR_ERR(page);
--
2.42.0.rc1.204.g551eb34607-goog