ntfs3(loop5): ino=1e, mi_enum_attr
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.5.1152/13484 is trying to acquire lock:
ffff88802239efd8 (&ni->file.run_lock#2){++++}-{4:4}, at: run_unpack_ex+0x7e5/0xba0

but task is already holding lock:
ffff88802b09c270 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x701/0xba0

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&wnd->rw_lock){++++}-{4:4}:
       lock_acquire+0x120/0x360
       down_write_nested+0x9d/0x200
       mark_as_free_ex+0x3e/0x390
       run_deallocate_ex+0x187/0x2f0
       attr_set_size+0xeb9/0x2c70
       ntfs_setattr+0x7d0/0xbe0
       notify_change+0xb36/0xe40
       do_truncate+0x1a4/0x220
       path_openat+0x306c/0x3830
       do_filp_open+0x1fa/0x410
       do_sys_openat2+0x121/0x1c0
       __x64_sys_creat+0x8f/0xc0
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ni->file.run_lock#2){++++}-{4:4}:
       validate_chain+0xb9b/0x2140
       __lock_acquire+0xab9/0xd20
       lock_acquire+0x120/0x360
       down_read+0x46/0x2e0
       run_unpack_ex+0x7e5/0xba0
       ntfs_iget5+0x232b/0x37c0
       dir_search_u+0x1df/0x2c0
       ntfs_lookup+0xfb/0x1f0
       __lookup_slow+0x297/0x3d0
       lookup_slow+0x53/0x70
       walk_component+0x2d2/0x400
       path_lookupat+0x163/0x430
       filename_lookup+0x212/0x570
       user_path_at+0x3a/0x60
       __se_sys_mount+0x2d3/0x410
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&wnd->rw_lock);
                               lock(&ni->file.run_lock#2);
                               lock(&wnd->rw_lock);
  rlock(&ni->file.run_lock#2);

 *** DEADLOCK ***

3 locks held by syz.5.1152/13484:
 #0: ffff88812b4aea68 (&type->i_mutex_dir_key#17){++++}-{4:4}, at: lookup_slow+0x46/0x70
 #1: ffff88812b4ae7d0 (&ni->ni_lock#3/6){+.+.}-{4:4}, at: ntfs_lookup+0xee/0x1f0
 #2: ffff88802b09c270 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x701/0xba0

stack backtrace:
CPU: 1 UID: 0 PID: 13484 Comm: syz.5.1152 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_circular_bug+0x2ee/0x310
 check_noncircular+0x134/0x160
 validate_chain+0xb9b/0x2140
 __lock_acquire+0xab9/0xd20
 lock_acquire+0x120/0x360
 down_read+0x46/0x2e0
 run_unpack_ex+0x7e5/0xba0
 ntfs_iget5+0x232b/0x37c0
 dir_search_u+0x1df/0x2c0
 ntfs_lookup+0xfb/0x1f0
 __lookup_slow+0x297/0x3d0
 lookup_slow+0x53/0x70
 walk_component+0x2d2/0x400
 path_lookupat+0x163/0x430
 filename_lookup+0x212/0x570
 user_path_at+0x3a/0x60
 __se_sys_mount+0x2d3/0x410
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1454b8ebe9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f14559dc038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1454dc5fa0 RCX: 00007f1454b8ebe9
RDX: 0000000000000000 RSI: 00002000000005c0 RDI: 0000000000000000
RBP: 00007f1454c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000100000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1454dc6038 R14: 00007f1454dc5fa0 R15: 00007fffc68d00d8
 </TASK>
