ntfs3(loop0): ino=1b, mi_enum_attr
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.790/11088 is trying to acquire lock:
ffff888114d42618 (&ni->file.run_lock#2){++++}-{4:4}, at: run_unpack_ex+0x7e5/0xba0

but task is already holding lock:
ffff88811476a278 (&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}:
       down_read_nested+0x49/0x2e0
       run_unpack_ex+0x610/0xba0
       attr_collapse_range+0xb83/0x15f0
       ntfs_fallocate+0x7d6/0x10b0
       vfs_fallocate+0x669/0x7e0
       __x64_sys_fallocate+0xc0/0x110
       do_syscall_64+0xec/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ni->file.run_lock#2){++++}-{4:4}:
       __lock_acquire+0x15a6/0x2cf0
       lock_acquire+0x107/0x340
       down_read+0x47/0x2e0
       run_unpack_ex+0x7e5/0xba0
       ntfs_iget5+0x238b/0x3860
       dir_search_u+0x1df/0x2c0
       ntfs_lookup+0xfb/0x1f0
       __lookup_slow+0x297/0x3d0
       lookup_slow+0x53/0x70
       path_lookupat+0x3f5/0x8c0
       filename_lookup+0x212/0x570
       user_path_at+0x3a/0x60
       __se_sys_mount+0x2d4/0x410
       do_syscall_64+0xec/0xf80
       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.0.790/11088:
 #0: ffff8881b82ae988 (&type->i_mutex_dir_key#10){++++}-{4:4}, at: lookup_slow+0x46/0x70
 #1: ffff8881b82ae6f0 (&ni->ni_lock/6){+.+.}-{4:4}, at: ntfs_lookup+0xee/0x1f0
 #2: ffff88811476a278 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x701/0xba0

stack backtrace:
CPU: 0 UID: 0 PID: 11088 Comm: syz.0.790 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+0xe8/0x150
 print_circular_bug+0x2e2/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x15a6/0x2cf0
 lock_acquire+0x107/0x340
 down_read+0x47/0x2e0
 run_unpack_ex+0x7e5/0xba0
 ntfs_iget5+0x238b/0x3860
 dir_search_u+0x1df/0x2c0
 ntfs_lookup+0xfb/0x1f0
 __lookup_slow+0x297/0x3d0
 lookup_slow+0x53/0x70
 path_lookupat+0x3f5/0x8c0
 filename_lookup+0x212/0x570
 user_path_at+0x3a/0x60
 __se_sys_mount+0x2d4/0x410
 do_syscall_64+0xec/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3af338f7c9
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:00007f3af15f6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3af35e5fa0 RCX: 00007f3af338f7c9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000000
RBP: 00007f3af33f297f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000001200800 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3af35e6038 R14: 00007f3af35e5fa0 R15: 00007ffde43723e8
 </TASK>
