======================================================
WARNING: possible circular locking dependency detected
4.14.294-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.5/9769 is trying to acquire lock:
 ("dio/%s"sb->s_id){+.+.}, at: [<ffffffff8135b8eb>] flush_workqueue+0xcb/0x1310 kernel/workqueue.c:2622

but task is already holding lock:
 (&sb->s_type->i_mutex_key#10){+.+.}, at: [<ffffffff81b78d8c>] inode_trylock include/linux/fs.h:739 [inline]
 (&sb->s_type->i_mutex_key#10){+.+.}, at: [<ffffffff81b78d8c>] ext4_file_write_iter+0x1cc/0xd20 fs/ext4/file.c:236

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&sb->s_type->i_mutex_key#10){+.+.}:
       down_write+0x34/0x90 kernel/locking/rwsem.c:54
       inode_lock include/linux/fs.h:719 [inline]
       __generic_file_fsync+0x9e/0x190 fs/libfs.c:989
       ext4_sync_file+0x8ed/0x12c0 fs/ext4/fsync.c:118
       vfs_fsync_range+0x103/0x260 fs/sync.c:196
       generic_write_sync include/linux/fs.h:2684 [inline]
       dio_complete+0x561/0x8d0 fs/direct-io.c:330
       process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
       worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
       kthread+0x30d/0x420 kernel/kthread.c:232
       ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

-> #1 ((&dio->complete_work)){+.+.}:
       process_one_work+0x736/0x14a0 kernel/workqueue.c:2093
       worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
       kthread+0x30d/0x420 kernel/kthread.c:232
       ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

-> #0 ("dio/%s"sb->s_id){+.+.}:
       lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
       flush_workqueue+0xfa/0x1310 kernel/workqueue.c:2625
       drain_workqueue+0x177/0x3e0 kernel/workqueue.c:2790
       destroy_workqueue+0x71/0x710 kernel/workqueue.c:4116
       sb_init_dio_done_wq+0x61/0x80 fs/direct-io.c:635
       do_blockdev_direct_IO fs/direct-io.c:1287 [inline]
       __blockdev_direct_IO+0x3df1/0xdcb0 fs/direct-io.c:1423
       ext4_direct_IO_write fs/ext4/inode.c:3756 [inline]
       ext4_direct_IO+0x888/0x1b80 fs/ext4/inode.c:3897
       generic_file_direct_write+0x1df/0x420 mm/filemap.c:2958
       __generic_file_write_iter+0x2a2/0x590 mm/filemap.c:3137
       ext4_file_write_iter+0x276/0xd20 fs/ext4/file.c:270
       call_write_iter include/linux/fs.h:1780 [inline]
       aio_write+0x2ed/0x560 fs/aio.c:1553
       io_submit_one fs/aio.c:1641 [inline]
       do_io_submit+0x847/0x1570 fs/aio.c:1709
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x46/0xbb

other info that might help us debug this:

Chain exists of:
  "dio/%s"sb->s_id --> (&dio->complete_work) --> &sb->s_type->i_mutex_key#10

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&sb->s_type->i_mutex_key#10);
                               lock((&dio->complete_work));
                               lock(&sb->s_type->i_mutex_key#10);
  lock("dio/%s"sb->s_id);

 *** DEADLOCK ***

2 locks held by syz-executor.5/9769:
 #0:  (sb_writers#3){.+.+}, at: [<ffffffff819847e8>] file_start_write include/linux/fs.h:2714 [inline]
 #0:  (sb_writers#3){.+.+}, at: [<ffffffff819847e8>] aio_write+0x408/0x560 fs/aio.c:1552
 #1:  (&sb->s_type->i_mutex_key#10){+.+.}, at: [<ffffffff81b78d8c>] inode_trylock include/linux/fs.h:739 [inline]
 #1:  (&sb->s_type->i_mutex_key#10){+.+.}, at: [<ffffffff81b78d8c>] ext4_file_write_iter+0x1cc/0xd20 fs/ext4/file.c:236

stack backtrace:
CPU: 1 PID: 9769 Comm: syz-executor.5 Not tainted 4.14.294-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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
 flush_workqueue+0xfa/0x1310 kernel/workqueue.c:2625
 drain_workqueue+0x177/0x3e0 kernel/workqueue.c:2790
 destroy_workqueue+0x71/0x710 kernel/workqueue.c:4116
 sb_init_dio_done_wq+0x61/0x80 fs/direct-io.c:635
 do_blockdev_direct_IO fs/direct-io.c:1287 [inline]
 __blockdev_direct_IO+0x3df1/0xdcb0 fs/direct-io.c:1423
 ext4_direct_IO_write fs/ext4/inode.c:3756 [inline]
 ext4_direct_IO+0x888/0x1b80 fs/ext4/inode.c:3897
 generic_file_direct_write+0x1df/0x420 mm/filemap.c:2958
 __generic_file_write_iter+0x2a2/0x590 mm/filemap.c:3137
 ext4_file_write_iter+0x276/0xd20 fs/ext4/file.c:270
 call_write_iter include/linux/fs.h:1780 [inline]
 aio_write+0x2ed/0x560 fs/aio.c:1553
 io_submit_one fs/aio.c:1641 [inline]
 do_io_submit+0x847/0x1570 fs/aio.c:1709
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f3b227b4669
RSP: 002b:00007f3b21107168 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007f3b228d6050 RCX: 00007f3b227b4669
RDX: 0000000020000540 RSI: 0000000000001801 RDI: 00007f3b228b1000
RBP: 00007f3b2280f560 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd7872a1ff R14: 00007f3b21107300 R15: 0000000000022000
input: syz1 as /devices/virtual/input/input7
input: syz1 as /devices/virtual/input/input8
caif:caif_disconnect_client(): nothing to disconnect
caif:caif_disconnect_client(): nothing to disconnect
caif:caif_disconnect_client(): nothing to disconnect
caif:caif_disconnect_client(): nothing to disconnect
caif:caif_disconnect_client(): nothing to disconnect
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'.
caif:caif_disconnect_client(): nothing to disconnect
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'.
caif:caif_disconnect_client(): nothing to disconnect
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'.
SQUASHFS error: lzo decompression failed, data probably corrupt
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'.
SQUASHFS error: squashfs_read_data failed to read block 0x11f
SQUASHFS error: Unable to read metadata cache entry [11f]
SQUASHFS error: Unable to read directory block [11f:26]
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'.
bridge0: port 3(batadv0) entered blocking state
bridge0: port 3(batadv0) entered disabled state
device batadv0 entered promiscuous mode
bridge0: port 3(batadv0) entered blocking state
bridge0: port 3(batadv0) entered forwarding state
befs: Unrecognized mount option "00000000000000000000X" or missing value
BTRFS: device fsid da33867d-e382-4163-b5e0-ea15c91cfb38 devid 1 transid 7 /dev/loop0
BTRFS info (device loop0): force clearing of disk cache
BTRFS info (device loop0): disk space caching is enabled
BTRFS info (device loop0): has skinny extents
BTRFS warning (device loop0): loop0 checksum verify failed on 30420992 wanted 538FDB82 found ABC4B005 level 0
BTRFS info (device loop0): read error corrected: ino 0 off 30420992 (dev /dev/loop0 sector 75800)
batman_adv: batadv0: No IGMP Querier present - multicast optimizations disabled
batman_adv: batadv0: No MLD Querier present - multicast optimizations disabled
befs: Unrecognized mount option "00000000000000000000X" or missing value
BTRFS info (device loop0): force clearing of disk cache
BTRFS info (device loop0): disk space caching is enabled
BTRFS info (device loop0): has skinny extents
bridge0: port 3(batadv0) entered blocking state
bridge0: port 3(batadv0) entered disabled state
device batadv0 entered promiscuous mode
bridge0: port 3(batadv0) entered blocking state
bridge0: port 3(batadv0) entered forwarding state
befs: Unrecognized mount option "00000000000000000000X" or missing value
befs: Unrecognized mount option "00000000000000000000X" or missing value
BTRFS warning (device loop0): loop0 checksum verify failed on 30420992 wanted 538FDB82 found ABC4B005 level 0
BTRFS info (device loop0): read error corrected: ino 0 off 30420992 (dev /dev/loop0 sector 75800)
batman_adv: batadv0: No IGMP Querier present - multicast optimizations disabled
batman_adv: batadv0: No MLD Querier present - multicast optimizations disabled
bridge0: port 3(batadv0) entered blocking state
BTRFS info (device loop0): force clearing of disk cache
bridge0: port 3(batadv0) entered disabled state
BTRFS info (device loop0): disk space caching is enabled
device batadv0 entered promiscuous mode
BTRFS info (device loop0): has skinny extents
bridge0: port 3(batadv0) entered blocking state
bridge0: port 3(batadv0) entered forwarding state
befs: Unrecognized mount option "00000000000000000000X" or missing value
befs: Unrecognized mount option "00000000000000000000X" or missing value
befs: Unrecognized mount option "00000000000000000000X" or missing value
Bluetooth: hci5 command 0x0405 tx timeout
batman_adv: batadv0: No IGMP Querier present - multicast optimizations disabled
batman_adv: batadv0: No MLD Querier present - multicast optimizations disabled
befs: Unrecognized mount option "00000000000000000000X" or missing value
BTRFS warning (device loop0): loop0 checksum verify failed on 30420992 wanted 538FDB82 found ABC4B005 level 0
BTRFS info (device loop0): read error corrected: ino 0 off 30420992 (dev /dev/loop0 sector 75800)
befs: Unrecognized mount option "00000000000000000000X" or missing value
BTRFS info (device loop0): force clearing of disk cache
BTRFS info (device loop0): disk space caching is enabled
BTRFS info (device loop0): has skinny extents
befs: Unrecognized mount option "00000000000000000000X" or missing value
IPVS: ftp: loaded support on port[0] = 21
BTRFS warning (device loop0): loop0 checksum verify failed on 30420992 wanted 538FDB82 found ABC4B005 level 0
BTRFS info (device loop0): read error corrected: ino 0 off 30420992 (dev /dev/loop0 sector 75800)
XFS (loop4): unknown mount option [X€+-³Å‹êzÆwe“©=ˆ–•uÌÑÉóïK�<RôàÚ÷âò~“{Þææ6_Óâ-À� [ÚÙºíc]Š²BàËì].
8021q: adding VLAN 0 to HW filter on device team0
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
bond0: Enslaving team0 as an active interface with an up link
bond0: Releasing backup interface team0
bridge0: port 3(team0) entered blocking state
bridge0: port 3(team0) entered disabled state
device team0 entered promiscuous mode
device team_slave_0 entered promiscuous mode
device team_slave_1 entered promiscuous mode
device team0 left promiscuous mode
UDF-fs: warning (device loop2): udf_load_vrs: No anchor found
device team_slave_0 left promiscuous mode
device team_slave_1 left promiscuous mode
UDF-fs: Scanning with blocksize 512 failed
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
bridge0: port 3(team0) entered disabled state
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/09/12 12:00 (1000)
8021q: adding VLAN 0 to HW filter on device team0
bond0: Enslaving team0 as an active interface with an up link
bond0: Releasing backup interface team0
bridge0: port 3(team0) entered blocking state
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
bridge0: port 3(team0) entered disabled state
device team0 entered promiscuous mode
device team_slave_0 entered promiscuous mode
EXT4-fs error (device loop3): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 16377 vs 0 free clusters
device team_slave_1 entered promiscuous mode
device team0 left promiscuous mode
XFS (loop5): unknown mount option [X€+-³Å‹êzÆwe“©=ˆ–•uÌÑÉóïK�<RôàÚ÷âò~“{Þææ6_Óâ-À� [ÚÙºíc]Š²BàËì].
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
XFS (loop4): unknown mount option [X€+-³Å‹êzÆwe“©=ˆ–•uÌÑÉóïK�<RôàÚ÷âò~“{Þææ6_Óâ-À� [ÚÙºíc]Š²BàËì].
device team_slave_0 left promiscuous mode
EXT4-fs error (device loop3): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 16377 vs 0 free clusters
device team_slave_1 left promiscuous mode
bridge0: port 3(team0) entered disabled state
8021q: adding VLAN 0 to HW filter on device team0
bond0: Enslaving team0 as an active interface with an up link
bond0: Releasing backup interface team0
bridge0: port 3(team0) entered blocking state
bridge0: port 3(team0) entered disabled state
device team0 entered promiscuous mode
device team_slave_0 entered promiscuous mode
device team_slave_1 entered promiscuous mode
XFS (loop3): unknown mount option [X€+-³Å‹êzÆwe“©=ˆ–•uÌÑÉóïK�<RôàÚ÷âò~“{Þææ6_Óâ-À� [ÚÙºíc]Š²BàËì].
device team0 left promiscuous mode
device team_slave_0 left promiscuous mode
device team_slave_1 left promiscuous mode
XFS (loop2): unknown mount option [X€+-³Å‹êzÆwe“©=ˆ–•uÌÑÉóïK�<RôàÚ÷âò~“{Þææ6_Óâ-À� [ÚÙºíc]Š²BàËì].
bridge0: port 3(team0) entered disabled state
XFS (loop4): unknown mount option [X€+-³Å‹êzÆwe“©=ˆ–•uÌÑÉóïK�<RôàÚ÷âò~“{Þææ6_Óâ-À� [ÚÙºíc]Š²BàËì].
8021q: adding VLAN 0 to HW filter on device team0
bond0: Enslaving team0 as an active interface with an up link
bond0: Releasing backup interface team0
bridge0: port 3(team0) entered blocking state
bridge0: port 3(team0) entered disabled state
device team0 entered promiscuous mode
XFS (loop5): unknown mount option [X€+-³Å‹êzÆwe“©=ˆ–•uÌÑÉóïK�<RôàÚ÷âò~“{Þææ6_Óâ-À� [ÚÙºíc]Š²BàËì].
device team_slave_0 entered promiscuous mode
device team_slave_1 entered promiscuous mode
XFS (loop3): unknown mount option [X€+-³Å‹êzÆwe“©=ˆ–•uÌÑÉóïK�<RôàÚ÷âò~“{Þææ6_Óâ-À� [ÚÙºíc]Š²BàËì].