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linux/fs/f2fs
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Jaegeuk Kim 88f10fb317 f2fs: avoid false alarm of circular locking 
commit 5c13e2388b upstream.

======================================================
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);

Cc: <stable@vger.kernel.org>
Reported-and-tested-by: syzbot+e5600587fa9cbf8e3826@syzkaller.appspotmail.com
Fixes: 5eda1ad1aa "f2fs: fix deadlock in i_xattr_sem and inode page lock"
Tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-19 12:30:23 +02:00
..
acl.c fs: port i_{g,u}id_into_vfs{g,u}id() to mnt_idmap 2023-01-19 09:24:29 +01:00
acl.h fs: port ->set_acl() to pass mnt_idmap 2023-01-19 09:24:27 +01:00
checkpoint.c f2fs: fix to account cp stats correctly 2023-09-13 09:53:43 +02:00
compress.c f2fs: add helper to check compression level 2023-06-26 06:07:09 -07:00
data.c f2fs: get out of a repeat loop when getting a locked data page 2023-09-19 12:30:23 +02:00
debug.c f2fs: fix to account cp stats correctly 2023-09-13 09:53:43 +02:00
dir.c f2fs: fix deadlock in i_xattr_sem and inode page lock 2023-06-30 16:38:09 -07:00
extent_cache.c f2fs: remove unnessary comment in __may_age_extent_tree 2023-04-24 11:03:10 -07:00
f2fs.h f2fs: avoid false alarm of circular locking 2023-09-19 12:30:23 +02:00
file.c f2fs: fix to account gc stats correctly 2023-09-13 09:53:43 +02:00
gc.c f2fs: fix to account cp stats correctly 2023-09-13 09:53:43 +02:00
gc.h f2fs: Fix system crash due to lack of free space in LFS 2023-04-10 10:58:45 -07:00
hash.c f2fs: don't use casefolded comparison for "." and ".." 2022-05-17 11:19:23 -07:00
inline.c f2fs: avoid false alarm of circular locking 2023-09-19 12:30:23 +02:00
inode.c Revert "f2fs: fix to do sanity check on extent cache correctly" 2023-09-13 09:53:43 +02:00
iostat.c f2fs: add async reset zone command support 2023-06-12 13:04:09 -07:00
iostat.h f2fs: use iostat_lat_type directly as a parameter in the iostat_update_and_unbind_ctx() 2023-02-07 10:39:28 -08:00
Kconfig f2fs: introduce F2FS_UNFAIR_RWSEM to support unfair rwsem 2022-03-04 09:15:53 -08:00
Makefile f2fs: separate out iostat feature 2021-08-23 10:25:51 -07:00
namei.c f2fs update for 6.5-rc1 2023-07-05 14:14:37 -07:00
node.c f2fs: fix to do sanity check on direct node in truncate_dnode() 2023-06-30 16:38:27 -07:00
node.h f2fs: fix compile warning in f2fs_destroy_node_manager() 2023-06-30 16:38:27 -07:00
recovery.c f2fs: fix to account cp stats correctly 2023-09-13 09:53:43 +02:00
segment.c f2fs: flush inode if atomic file is aborted 2023-09-19 12:30:23 +02:00
segment.h f2fs: add has_enough_free_secs() 2023-04-18 09:05:54 -07:00
shrinker.c f2fs: add block_age-based extent cache 2022-12-12 14:53:56 -08:00
super.c f2fs: compress: fix to assign compress_level for lz4 correctly 2023-09-13 09:53:45 +02:00
sysfs.c f2fs: fix to account cp stats correctly 2023-09-13 09:53:43 +02:00
verity.c f2fs-for-6.3-rc1 2023-02-27 16:18:51 -08:00
xattr.c f2fs: fix deadlock in i_xattr_sem and inode page lock 2023-06-30 16:38:09 -07:00
xattr.h f2fs: cleanup MIN_INLINE_XATTR_SIZE 2023-06-26 06:07:10 -07:00