======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.3.2694/12980 is trying to acquire lock:
ffff8881a7590270 (&wnd->rw_lock){++++}-{4:4}, at: ntfs_look_for_free_space+0xd3/0x600

but task is already holding lock:
ffff8881a8391ed0 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x140/0x200

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ni->file.run_lock#2){++++}-{4:4}:
       lock_acquire+0x120/0x360
       down_read+0x46/0x2e0
       run_unpack_ex+0x7e5/0xba0
       ntfs_iget5+0x232b/0x37e0
       dir_search_u+0x1df/0x2c0
       ntfs_lookup+0xfb/0x1f0
       path_openat+0x1101/0x3830
       do_filp_open+0x1fa/0x410
       do_sys_openat2+0x121/0x1c0
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0xfa/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&wnd->rw_lock){++++}-{4:4}:
       validate_chain+0xb9b/0x2140
       __lock_acquire+0xab9/0xd20
       lock_acquire+0x120/0x360
       down_write_nested+0x9d/0x200
       ntfs_look_for_free_space+0xd3/0x600
       attr_allocate_clusters+0x1c1/0x6d0
       attr_set_size+0x14a4/0x2c70
       ntfs_set_size+0x164/0x200
       ntfs_extend+0x1d9/0x970
       ntfs_file_write_iter+0x421/0x870
       do_iter_readv_writev+0x623/0x8c0
       vfs_writev+0x31a/0x960
       do_writev+0x14d/0x2d0
       do_syscall_64+0xfa/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

5 locks held by syz.3.2694/12980:
 #0: ffff8881979a68f8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320
 #1: ffff8881a7592420 (sb_writers#15){.+.+}-{0:0}, at: vfs_writev+0x288/0x960
 #2: ffff8881a83920b8 (&sb->s_type->i_mutex_key#22){+.+.}-{4:4}, at: ntfs_file_write_iter+0x7a/0x870
 #3: ffff8881a8391e20 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_set_size+0x131/0x200
 #4: ffff8881a8391ed0 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x140/0x200

stack backtrace:
CPU: 1 UID: 0 PID: 12980 Comm: syz.3.2694 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_write_nested+0x9d/0x200
 ntfs_look_for_free_space+0xd3/0x600
 attr_allocate_clusters+0x1c1/0x6d0
 attr_set_size+0x14a4/0x2c70
 ntfs_set_size+0x164/0x200
 ntfs_extend+0x1d9/0x970
 ntfs_file_write_iter+0x421/0x870
 do_iter_readv_writev+0x623/0x8c0
 vfs_writev+0x31a/0x960
 do_writev+0x14d/0x2d0
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd7ea38efc9
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:00007fd7eb263038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fd7ea5e5fa0 RCX: 00007fd7ea38efc9
RDX: 0000000000000001 RSI: 0000200000000140 RDI: 0000000000000004
RBP: 00007fd7ea411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd7ea5e6038 R14: 00007fd7ea5e5fa0 R15: 00007ffe175251c8
 </TASK>
