overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
======================================================
WARNING: possible circular locking dependency detected
4.14.306-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/11767 is trying to acquire lock:
 (&ovl_i_mutex_dir_key[depth]){++++}, at: [<ffffffff818b2827>] iterate_dir+0x387/0x5e0 fs/readdir.c:43

but task is already holding lock:
 (sb_writers#3){.+.+}, at: [<ffffffff818e1fea>] sb_start_write include/linux/fs.h:1551 [inline]
 (sb_writers#3){.+.+}, at: [<ffffffff818e1fea>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (sb_writers#3){.+.+}:
       percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
       percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
       __sb_start_write+0x64/0x260 fs/super.c:1342
       sb_start_write include/linux/fs.h:1551 [inline]
       mnt_want_write+0x3a/0xb0 fs/namespace.c:386
       ovl_create_object+0x75/0x1d0 fs/overlayfs/dir.c:538
       lookup_open+0x77a/0x1750 fs/namei.c:3241
       do_last fs/namei.c:3334 [inline]
       path_openat+0xe08/0x2970 fs/namei.c:3571
       do_filp_open+0x179/0x3c0 fs/namei.c:3605
       do_sys_open+0x296/0x410 fs/open.c:1081
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x5e/0xd3

-> #0 (&ovl_i_mutex_dir_key[depth]){++++}:
       lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
       down_write_killable+0x37/0xb0 kernel/locking/rwsem.c:68
       iterate_dir+0x387/0x5e0 fs/readdir.c:43
       ovl_dir_read fs/overlayfs/readdir.c:306 [inline]
       ovl_dir_read_merged+0x2c5/0x430 fs/overlayfs/readdir.c:365
       ovl_check_empty_dir+0x6e/0x200 fs/overlayfs/readdir.c:870
       ovl_check_empty_and_clear+0x72/0xe0 fs/overlayfs/dir.c:306
       ovl_rename+0x57d/0xe50 fs/overlayfs/dir.c:959
       vfs_rename+0x560/0x1820 fs/namei.c:4498
       SYSC_renameat2 fs/namei.c:4646 [inline]
       SyS_renameat2+0x95b/0xad0 fs/namei.c:4535
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x5e/0xd3

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(sb_writers#3);
                               lock(&ovl_i_mutex_dir_key[depth]);
                               lock(sb_writers#3);
  lock(&ovl_i_mutex_dir_key[depth]);

 *** DEADLOCK ***

6 locks held by syz-executor.0/11767:
 #0:  (sb_writers#15){.+.+}, at: [<ffffffff818e1fea>] sb_start_write include/linux/fs.h:1551 [inline]
 #0:  (sb_writers#15){.+.+}, at: [<ffffffff818e1fea>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386
 #1:  (&type->s_vfs_rename_key#3){+.+.}, at: [<ffffffff818934f4>] lock_rename+0x54/0x280 fs/namei.c:2889
 #2:  (&ovl_i_mutex_dir_key[depth]#2/1){+.+.}, at: [<ffffffff818935d2>] inode_lock_nested include/linux/fs.h:754 [inline]
 #2:  (&ovl_i_mutex_dir_key[depth]#2/1){+.+.}, at: [<ffffffff818935d2>] lock_rename+0x132/0x280 fs/namei.c:2900
 #3:  (&ovl_i_mutex_dir_key[depth]#2/2){+.+.}, at: [<ffffffff81893606>] inode_lock_nested include/linux/fs.h:754 [inline]
 #3:  (&ovl_i_mutex_dir_key[depth]#2/2){+.+.}, at: [<ffffffff81893606>] lock_rename+0x166/0x280 fs/namei.c:2901
 #4:  (&ovl_i_mutex_dir_key[depth]#2){++++}, at: [<ffffffff818a7158>] inode_lock include/linux/fs.h:719 [inline]
 #4:  (&ovl_i_mutex_dir_key[depth]#2){++++}, at: [<ffffffff818a7158>] vfs_rename+0xbd8/0x1820 fs/namei.c:4472
 #5:  (sb_writers#3){.+.+}, at: [<ffffffff818e1fea>] sb_start_write include/linux/fs.h:1551 [inline]
 #5:  (sb_writers#3){.+.+}, at: [<ffffffff818e1fea>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386

stack backtrace:
CPU: 1 PID: 11767 Comm: syz-executor.0 Not tainted 4.14.306-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258
 check_prev_add kernel/locking/lockdep.c:1905 [inline]
 check_prevs_add kernel/locking/lockdep.c:2022 [inline]
 validate_chain kernel/locking/lockdep.c:2464 [inline]
 __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 down_write_killable+0x37/0xb0 kernel/locking/rwsem.c:68
 iterate_dir+0x387/0x5e0 fs/readdir.c:43
 ovl_dir_read fs/overlayfs/readdir.c:306 [inline]
 ovl_dir_read_merged+0x2c5/0x430 fs/overlayfs/readdir.c:365
 ovl_check_empty_dir+0x6e/0x200 fs/overlayfs/readdir.c:870
 ovl_check_empty_and_clear+0x72/0xe0 fs/overlayfs/dir.c:306
 ovl_rename+0x57d/0xe50 fs/overlayfs/dir.c:959
 vfs_rename+0x560/0x1820 fs/namei.c:4498
 SYSC_renameat2 fs/namei.c:4646 [inline]
 SyS_renameat2+0x95b/0xad0 fs/namei.c:4535
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f51aac580f9
RSP: 002b:00007f51a91ca168 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f51aad77f80 RCX: 00007f51aac580f9
RDX: 0000000000000000 RSI: 0000000020000440 RDI: 0000000020000100
RBP: 00007f51aacb3ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffeff1ea3ef R14: 00007f51a91ca300 R15: 0000000000022000
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
REISERFS (device loop1): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop1): using ordered data mode
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
reiserfs: using flush barriers
REISERFS (device loop1): journal params: device loop1, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 2, max trans age 2
REISERFS (device loop1): checking transaction log (loop1)
REISERFS (device loop1): Using rupasov hash to sort names
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
XFS (loop3): Mounting V4 Filesystem
XFS (loop3): Ending clean mount
XFS (loop3): Quotacheck needed: Please wait.
REISERFS (device loop1): found reiserfs format "3.6" with non-standard journal
XFS (loop3): Quotacheck: Done.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
REISERFS (device loop1): using ordered data mode
reiserfs: using flush barriers
REISERFS (device loop1): journal params: device loop1, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 2, max trans age 2
REISERFS (device loop1): checking transaction log (loop1)
REISERFS (device loop1): Using rupasov hash to sort names
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
XFS (loop3): Unmounting Filesystem
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
REISERFS (device loop1): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop1): using ordered data mode
reiserfs: using flush barriers
REISERFS (device loop1): journal params: device loop1, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 2, max trans age 2
REISERFS (device loop1): checking transaction log (loop1)
REISERFS (device loop1): Using rupasov hash to sort names
XFS (loop3): Mounting V4 Filesystem
XFS (loop3): Ending clean mount
XFS (loop3): Quotacheck needed: Please wait.
XFS (loop3): Quotacheck: Done.
XFS (loop3): Unmounting Filesystem
REISERFS (device loop1): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop1): using ordered data mode
reiserfs: using flush barriers
REISERFS (device loop1): journal params: device loop1, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 2, max trans age 2
REISERFS (device loop1): checking transaction log (loop1)
REISERFS (device loop1): Using rupasov hash to sort names
XFS (loop5): Mounting V4 Filesystem
XFS (loop4): Mounting V4 Filesystem
XFS (loop4): Ending clean mount
XFS (loop5): Ending clean mount
XFS (loop4): Quotacheck needed: Please wait.
XFS (loop5): Quotacheck needed: Please wait.
XFS (loop4): Quotacheck: Done.
XFS (loop5): Quotacheck: Done.
XFS (loop3): Mounting V4 Filesystem
XFS (loop4): Unmounting Filesystem
XFS (loop3): Ending clean mount
XFS (loop3): Quotacheck needed: Please wait.
XFS (loop3): Quotacheck: Done.
XFS (loop5): Unmounting Filesystem
XFS (loop3): Unmounting Filesystem
XFS (loop4): Mounting V4 Filesystem
XFS (loop4): Ending clean mount
XFS (loop4): Quotacheck needed: Please wait.
XFS (loop4): Quotacheck: Done.
XFS (loop3): Mounting V4 Filesystem
XFS (loop3): Ending clean mount
XFS (loop3): Quotacheck needed: Please wait.
XFS (loop4): Unmounting Filesystem
XFS (loop5): Mounting V4 Filesystem
XFS (loop3): Quotacheck: Done.
XFS (loop5): Ending clean mount
XFS (loop5): Quotacheck needed: Please wait.
XFS (loop5): Quotacheck: Done.
XFS (loop5): Unmounting Filesystem
XFS (loop3): Unmounting Filesystem
netlink: 44 bytes leftover after parsing attributes in process `syz-executor.2'.
NILFS (loop0): invalid segment: Checksum error in segment payload
netlink: 44 bytes leftover after parsing attributes in process `syz-executor.2'.
NILFS (loop0): trying rollback from an earlier position
NILFS (loop0): recovery complete
netlink: 44 bytes leftover after parsing attributes in process `syz-executor.2'.
NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop0): invalid segment: Checksum error in segment payload
NILFS (loop0): trying rollback from an earlier position
NILFS (loop0): recovery complete
NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
XFS (loop4): Mounting V4 Filesystem
XFS (loop4): Ending clean mount
XFS (loop4): Quotacheck needed: Please wait.
XFS (loop4): Quotacheck: Done.
XFS (loop4): Unmounting Filesystem
XFS (loop5): Mounting V4 Filesystem
netlink: 44 bytes leftover after parsing attributes in process `syz-executor.2'.
XFS (loop5): Ending clean mount
XFS (loop5): Quotacheck needed: Please wait.
XFS (loop5): Quotacheck: Done.
XFS (loop5): Unmounting Filesystem
NILFS (loop0): invalid segment: Checksum error in segment payload
NILFS (loop0): trying rollback from an earlier position
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop0): recovery complete
NILFS (loop2): invalid segment: Checksum error in segment payload
NILFS (loop1): trying rollback from an earlier position
NILFS (loop2): trying rollback from an earlier position
NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop1): recovery complete
NILFS (loop2): recovery complete
NILFS (loop1): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop5): invalid segment: Checksum error in segment payload
NILFS (loop5): trying rollback from an earlier position
NILFS (loop5): recovery complete
NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): trying rollback from an earlier position
NILFS (loop1): recovery complete
NILFS (loop1): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop2): invalid segment: Checksum error in segment payload
NILFS (loop2): trying rollback from an earlier position
NILFS (loop0): invalid segment: Checksum error in segment payload
bridge0: port 2(bridge_slave_1) entered disabled state
bridge0: port 1(bridge_slave_0) entered disabled state
NILFS (loop0): trying rollback from an earlier position
NILFS (loop2): recovery complete
NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop0): recovery complete
NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
batman_adv: batadv0: Interface deactivated: batadv_slave_0
batman_adv: batadv0: Interface deactivated: batadv_slave_1
NILFS (loop5): invalid segment: Checksum error in segment payload
NILFS (loop5): trying rollback from an earlier position
NILFS (loop5): recovery complete
NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): trying rollback from an earlier position
NILFS (loop2): invalid segment: Checksum error in segment payload
NILFS (loop1): recovery complete
NILFS (loop5): invalid segment: Checksum error in segment payload
NILFS (loop2): trying rollback from an earlier position
NILFS (loop5): trying rollback from an earlier position
NILFS (loop1): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop5): recovery complete
NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop2): recovery complete
NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
REISERFS (device loop4): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop4): using ordered data mode
reiserfs: using flush barriers
bridge0: port 2(bridge_slave_1) entered disabled state
bridge0: port 1(bridge_slave_0) entered disabled state
batman_adv: batadv0: Interface deactivated: batadv_slave_0
batman_adv: batadv0: Interface deactivated: batadv_slave_1
REISERFS (device loop4): journal params: device loop4, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop4): checking transaction log (loop4)
bridge0: port 3(team0) entered disabled state
bridge0: port 2(bridge_slave_1) entered disabled state
bridge0: port 1(bridge_slave_0) entered disabled state
batman_adv: batadv0: Interface deactivated: batadv_slave_0
batman_adv: batadv0: Interface deactivated: batadv_slave_1
bridge0: port 3(team0) entered disabled state
bridge0: port 2(bridge_slave_1) entered disabled state
REISERFS (device loop4): Using r5 hash to sort names
bridge0: port 1(bridge_slave_0) entered disabled state
REISERFS (device loop4): Created .reiserfs_priv - reserved for xattr storage.
batman_adv: batadv0: Interface deactivated: batadv_slave_0
batman_adv: batadv0: Interface deactivated: batadv_slave_1
ntfs: volume version 3.1.