ntfs3(loop6): failed to convert "0080" to cp852
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.6.1346/17337 is trying to acquire lock:
ffff888060985dd0 (&ni->file.run_lock#2){++++}-{4:4}, at: run_unpack_ex+0x7e5/0xba0 fs/ntfs3/run.c:1124

but task is already holding lock:
ffff888035230250 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x701/0xba0 fs/ntfs3/run.c:1105

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 kernel/locking/lockdep.c:5868
       down_write_nested+0x3e/0x60 kernel/locking/rwsem.c:1706
       ntfs_look_for_free_space+0xd3/0x600 fs/ntfs3/fsntfs.c:362
       attr_allocate_clusters+0x1c1/0x6d0 fs/ntfs3/attrib.c:159
       attr_set_size+0x14a4/0x2c70 fs/ntfs3/attrib.c:574
       ntfs_extend_mft+0x162/0x450 fs/ntfs3/fsntfs.c:512
       ntfs_look_free_mft+0x5f8/0xd50 fs/ntfs3/fsntfs.c:709
       ntfs_create_inode+0x590/0x32a0 fs/ntfs3/inode.c:1302
       ntfs_create+0x3d/0x50 fs/ntfs3/namei.c:110
       lookup_open fs/namei.c:3796 [inline]
       open_last_lookups fs/namei.c:3895 [inline]
       path_openat+0x1500/0x3840 fs/namei.c:4131
       do_filp_open+0x1fa/0x410 fs/namei.c:4161
       do_sys_openat2+0x121/0x1c0 fs/open.c:1437
       do_sys_open fs/open.c:1452 [inline]
       __do_sys_open fs/open.c:1460 [inline]
       __se_sys_open fs/open.c:1456 [inline]
       __x64_sys_open+0x11e/0x150 fs/open.c:1456
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ni->file.run_lock#2){++++}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908
       __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
       down_read+0x97/0x1f0 kernel/locking/rwsem.c:1537
       run_unpack_ex+0x7e5/0xba0 fs/ntfs3/run.c:1124
       ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
       ntfs_iget5+0x232b/0x37e0 fs/ntfs3/inode.c:541
       ntfs_dir_emit fs/ntfs3/dir.c:337 [inline]
       ntfs_read_hdr+0x7cf/0xc30 fs/ntfs3/dir.c:385
       ntfs_readdir+0xa5f/0xdd0 fs/ntfs3/dir.c:496
       iterate_dir+0x3a5/0x580 fs/readdir.c:108
       __do_sys_getdents fs/readdir.c:326 [inline]
       __se_sys_getdents+0xe4/0x250 fs/readdir.c:312
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
       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.6.1346/17337:
 #0: ffff88802311cb28 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x253/0x320 fs/file.c:1232
 #1: ffff88805e79b978 (&type->i_mutex_dir_key#18){++++}-{4:4}, at: iterate_dir+0x29e/0x580 fs/readdir.c:101
 #2: ffff888035230250 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x701/0xba0 fs/ntfs3/run.c:1105

stack backtrace:
CPU: 0 UID: 0 PID: 17337 Comm: syz.6.1346 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043
 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908
 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 down_read+0x97/0x1f0 kernel/locking/rwsem.c:1537
 run_unpack_ex+0x7e5/0xba0 fs/ntfs3/run.c:1124
 ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
 ntfs_iget5+0x232b/0x37e0 fs/ntfs3/inode.c:541
 ntfs_dir_emit fs/ntfs3/dir.c:337 [inline]
 ntfs_read_hdr+0x7cf/0xc30 fs/ntfs3/dir.c:385
 ntfs_readdir+0xa5f/0xdd0 fs/ntfs3/dir.c:496
 iterate_dir+0x3a5/0x580 fs/readdir.c:108
 __do_sys_getdents fs/readdir.c:326 [inline]
 __se_sys_getdents+0xe4/0x250 fs/readdir.c:312
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5afa67eec9
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:00007f5af88de038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f5afa8d5fa0 RCX: 00007f5afa67eec9
RDX: 00000000000000b8 RSI: 0000200000001fc0 RDI: 0000000000000004
RBP: 00007f5afa701f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5afa8d6038 R14: 00007f5afa8d5fa0 R15: 00007ffd3fbcac98
 </TASK>
ntfs3(loop6): failed to convert name for inode 1e.
ntfs3(loop6): ino=1f, mi_enum_attr