loop6: detected capacity change from 0 to 4096
ntfs3(loop6): Different NTFS sector size (1024) and media sector size (512).
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.6.1678/12379 is trying to acquire lock:
ffff88812407e270 (&wnd->rw_lock){++++}-{4:4}, at: ntfs_look_for_free_space+0xd3/0x600

but task is already holding lock:
ffff88810363a668 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_extend_mft+0x13d/0x450

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/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
       filename_getxattr+0xaa/0x210
       __x64_sys_lgetxattr+0x1c6/0x210
       do_syscall_64+0xfa/0x3b0
       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_extend_mft+0x162/0x450
       ntfs_look_free_mft+0x5f8/0xd50
       ntfs_create_inode+0x590/0x32a0
       ntfs_create+0x3d/0x50
       path_openat+0x14f4/0x3830
       do_filp_open+0x1fa/0x410
       do_sys_openat2+0x121/0x1c0
       __x64_sys_openat+0x138/0x170
       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(&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.6.1678/12379:
 #0: ffff888121048428 (sb_writers#19){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88810363d460 (&type->i_mutex_dir_key#12){++++}-{4:4}, at: path_openat+0x8da/0x3830
 #2: ffff88810363d1c8 (&ni->ni_lock#3/6){+.+.}-{4:4}, at: ntfs_create_inode+0x16e/0x32a0
 #3: ffff88812407e128 (&wnd->rw_lock/1){+.+.}-{4:4}, at: ntfs_look_free_mft+0x163/0xd50
 #4: ffff88810363a668 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_extend_mft+0x13d/0x450

stack backtrace:
CPU: 1 UID: 0 PID: 12379 Comm: syz.6.1678 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_extend_mft+0x162/0x450
 ntfs_look_free_mft+0x5f8/0xd50
 ntfs_create_inode+0x590/0x32a0
 ntfs_create+0x3d/0x50
 path_openat+0x14f4/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3c12d8ebe9
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:00007f3c13c4f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f3c12fc5fa0 RCX: 00007f3c12d8ebe9
RDX: 000000000000275a RSI: 0000200000000540 RDI: ffffffffffffff9c
RBP: 00007f3c12e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3c12fc6038 R14: 00007f3c12fc5fa0 R15: 00007ffc86aeaba8
 </TASK>
ntfs3(loop6): ino=0, attr_set_size
ntfs3(loop6): ino=0, attr_set_size
ntfs3(loop6): ino=0, attr_set_size
ntfs3(loop6): no free space to extend mft
