Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts.
[  902.562766] IPVS: ftp: loaded support on port[0] = 21
[  902.565313] IPVS: ftp: loaded support on port[0] = 21
[  902.577999] IPVS: ftp: loaded support on port[0] = 21
[  902.578052] IPVS: ftp: loaded support on port[0] = 21
[  902.589309] IPVS: ftp: loaded support on port[0] = 21
[  902.589466] IPVS: ftp: loaded support on port[0] = 21
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[  921.867634] 
[  921.869279] ======================================================
[  921.875591] WARNING: possible circular locking dependency detected
[  921.881894] 4.19.211-syzkaller #0 Not tainted
[  921.886432] ------------------------------------------------------
[  921.892762] syz-executor424/10773 is trying to acquire lock:
[  921.898535] 00000000eabbcad1 ((wq_completion)"dio/%s"sb->s_id){+.+.}, at: flush_workqueue+0xe8/0x13e0
[  921.907883] 
[  921.907883] but task is already holding lock:
[  921.913834] 000000000c6c45b0 (&sb->s_type->i_mutex_key#18){++++}, at: generic_file_write_iter+0x99/0x730
[  921.923444] 
[  921.923444] which lock already depends on the new lock.
[  921.923444] 
[  921.931784] 
[  921.931784] the existing dependency chain (in reverse order) is:
[  921.939380] 
[  921.939380] -> #2 (&sb->s_type->i_mutex_key#18){++++}:
[  921.946160]        __generic_file_fsync+0xb0/0x1f0
[  921.951067]        fat_file_fsync+0x73/0x200
[  921.955450]        vfs_fsync_range+0x13a/0x220
[  921.960009]        dio_complete+0x763/0xac0
[  921.964311]        process_one_work+0x864/0x1570
[  921.969396]        worker_thread+0x64c/0x1130
[  921.973870]        kthread+0x33f/0x460
[  921.977750]        ret_from_fork+0x24/0x30
[  921.981973] 
[  921.981973] -> #1 ((work_completion)(&dio->complete_work)){+.+.}:
[  921.989686]        worker_thread+0x64c/0x1130
[  921.994245]        kthread+0x33f/0x460
[  921.998122]        ret_from_fork+0x24/0x30
[  922.002336] 
[  922.002336] -> #0 ((wq_completion)"dio/%s"sb->s_id){+.+.}:
[  922.009423]        flush_workqueue+0x117/0x13e0
[  922.014074]        drain_workqueue+0x1a5/0x460
[  922.018637]        destroy_workqueue+0x75/0x790
[  922.023286]        __alloc_workqueue_key+0xb76/0xed0
[  922.028376]        sb_init_dio_done_wq+0x34/0x90
[  922.033110]        __blockdev_direct_IO+0x5f55/0xef40
[  922.038278]        fat_direct_IO+0x1d1/0x370
[  922.042663]        generic_file_direct_write+0x208/0x4a0
[  922.048090]        __generic_file_write_iter+0x2d0/0x610
[  922.053517]        generic_file_write_iter+0x3f8/0x730
[  922.058773]        aio_write+0x37f/0x5c0
[  922.062808]        io_submit_one+0xecd/0x20c0
[  922.067296]        __se_sys_io_submit+0x11b/0x4a0
[  922.072116]        do_syscall_64+0xf9/0x620
[  922.076421]        entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  922.082103] 
[  922.082103] other info that might help us debug this:
[  922.082103] 
[  922.090225] Chain exists of:
[  922.090225]   (wq_completion)"dio/%s"sb->s_id --> (work_completion)(&dio->complete_work) --> &sb->s_type->i_mutex_key#18
[  922.090225] 
[  922.105562]  Possible unsafe locking scenario:
[  922.105562] 
[  922.111597]        CPU0                    CPU1
[  922.116258]        ----                    ----
[  922.120902]   lock(&sb->s_type->i_mutex_key#18);
[  922.125648]                                lock((work_completion)(&dio->complete_work));
[  922.133853]                                lock(&sb->s_type->i_mutex_key#18);
[  922.141109]   lock((wq_completion)"dio/%s"sb->s_id);
[  922.146215] 
[  922.146215]  *** DEADLOCK ***
[  922.146215] 
[  922.152263] 1 lock held by syz-executor424/10773:
[  922.157081]  #0: 000000000c6c45b0 (&sb->s_type->i_mutex_key#18){++++}, at: generic_file_write_iter+0x99/0x730
[  922.167133] 
[  922.167133] stack backtrace:
[  922.172111] CPU: 0 PID: 10773 Comm: syz-executor424 Not tainted 4.19.211-syzkaller #0
[  922.180057] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  922.189391] Call Trace:
[  922.191979]  dump_stack+0x1fc/0x2ef
[  922.195603]  print_circular_bug.constprop.0.cold+0x2d7/0x41e
[  922.201432]  __lock_acquire+0x30c9/0x3ff0
[  922.205572]  ? check_preemption_disabled+0x41/0x280
[  922.210569]  ? mark_held_locks+0xf0/0xf0
[  922.214670]  ? mark_held_locks+0xf0/0xf0
[  922.218709]  ? lock_downgrade+0x720/0x720
[  922.222957]  ? lock_acquire+0x170/0x3c0
[  922.226916]  ? depot_save_stack+0x1e0/0x410
[  922.231222]  ? check_preemption_disabled+0x41/0x280
[  922.236268]  lock_acquire+0x170/0x3c0
[  922.240058]  ? flush_workqueue+0xe8/0x13e0
[  922.244276]  flush_workqueue+0x117/0x13e0
[  922.248419]  ? flush_workqueue+0xe8/0x13e0
[  922.252655]  ? lock_downgrade+0x720/0x720
[  922.256786]  ? drain_workqueue+0x24/0x460
[  922.260920]  ? check_flush_dependency+0x400/0x400
[  922.265764]  ? _raw_spin_unlock_irqrestore+0x66/0xe0
[  922.270858]  drain_workqueue+0x1a5/0x460
[  922.274900]  ? init_rescuer+0x2d0/0x370
[  922.278853]  destroy_workqueue+0x75/0x790
[  922.282982]  __alloc_workqueue_key+0xb76/0xed0
[  922.287544]  ? deref_stack_reg+0x1d0/0x1d0
[  922.291765]  ? workqueue_sysfs_register+0x3e0/0x3e0
[  922.296763]  ? check_preemption_disabled+0x41/0x280
[  922.301762]  ? __blockdev_direct_IO+0x36a/0xef40
[  922.306504]  sb_init_dio_done_wq+0x34/0x90
[  922.310724]  __blockdev_direct_IO+0x5f55/0xef40
[  922.315389]  ? fat_add_cluster+0xf0/0xf0
[  922.319441]  ? mark_held_locks+0xf0/0xf0
[  922.323491]  ? mark_held_locks+0xf0/0xf0
[  922.327601]  ? sb_init_dio_done_wq+0x90/0x90
[  922.331999]  ? io_submit_one+0xecd/0x20c0
[  922.336132]  ? aa_file_perm+0x3f0/0xd20
[  922.340091]  ? clear_shadow_entry+0x170/0x170
[  922.344569]  ? current_time+0x13c/0x1c0
[  922.348550]  ? igrab+0xb0/0xb0
[  922.351750]  ? mark_held_locks+0xf0/0xf0
[  922.355789]  fat_direct_IO+0x1d1/0x370
[  922.359679]  generic_file_direct_write+0x208/0x4a0
[  922.364606]  __generic_file_write_iter+0x2d0/0x610
[  922.369531]  generic_file_write_iter+0x3f8/0x730
[  922.374268]  aio_write+0x37f/0x5c0
[  922.377790]  ? aio_setup_rw.isra.0+0x110/0x110
[  922.382354]  ? lock_downgrade+0x720/0x720
[  922.386485]  ? lock_downgrade+0x720/0x720
[  922.390619]  ? lock_acquire+0x170/0x3c0
[  922.394590]  ? __might_fault+0xef/0x1d0
[  922.398546]  io_submit_one+0xecd/0x20c0
[  922.402501]  ? lock_downgrade+0x720/0x720
[  922.406626]  ? aio_read+0x420/0x420
[  922.410248]  ? __might_fault+0x11f/0x1d0
[  922.414292]  __se_sys_io_submit+0x11b/0x4a0
[  922.418594]  ? io_submit_one+0x20c0/0x20c0
[  922.422909]  ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe
[  922.428261]  ? trace_hardirqs_off_caller+0x6e/0x210
[  922.433254]  ? do_syscall_64+0x21/0x620
[  922.437207]  do_syscall_64+0xf9/0x620
[  922.440987]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  922.446155] RIP: 0033:0x7f1cfc8a8da9
[  922.449848] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
[  922.468731] RSP: 002b:00007f1cfc84d2f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
[  922.476417] RAX: ffffffffffffffda RBX: 0000000000000040 RCX: 00007f1cfc8a8da9
[  922.483664] RDX: 0000000020000540 RSI: 0000000000001801 RDI: 00007f1cfc803000
[  922.490911] RBP: 00007f1cfc9264a8 R08: 0000000000000000 R09: 0000000000000000
[  922.498156] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1cfc9264a0
[  922.505403] R13: 00007f1cfc9264ac R14: 00007f1cfc8f3404 R15: 0000000000022000
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