ntfs3(loop3): failed to convert "0080" to cp852
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.3.214/6607 is trying to acquire lock:
ffff88806ad32668 (&ni->file.run_lock#2){++++}-{4:4}, at: run_unpack_ex+0x671/0x740 fs/ntfs3/run.c:1119

but task is already holding lock:
ffff88802d52c270 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x41e/0x740 fs/ntfs3/run.c:1100

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&wnd->rw_lock){++++}-{4:4}:
       down_write_nested+0x96/0x210 kernel/locking/rwsem.c:1706
       ntfs_look_for_free_space+0xcc/0x720 fs/ntfs3/fsntfs.c:362
       attr_allocate_clusters+0x3ff/0x6f0 fs/ntfs3/attrib.c:159
       attr_set_size+0x15ae/0x2c50 fs/ntfs3/attrib.c:574
       ntfs_set_size+0x13d/0x220 fs/ntfs3/inode.c:861
       ntfs_extend+0x7c2/0xa20 fs/ntfs3/file.c:359
       ntfs_setattr+0xa46/0xda0 fs/ntfs3/file.c:780
       notify_change+0x6a9/0x1230 fs/attr.c:552
       do_truncate+0x1d7/0x230 fs/open.c:68
       vfs_truncate+0x5d6/0x6e0 fs/open.c:118
       do_sys_truncate fs/open.c:141 [inline]
       __do_sys_truncate fs/open.c:153 [inline]
       __se_sys_truncate fs/open.c:151 [inline]
       __x64_sys_truncate+0x172/0x1e0 fs/open.c:151
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0x4c0 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 kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
       down_read+0x9b/0x480 kernel/locking/rwsem.c:1537
       run_unpack_ex+0x671/0x740 fs/ntfs3/run.c:1119
       ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
       ntfs_iget5+0xd97/0x3ab0 fs/ntfs3/inode.c:540
       ntfs_dir_emit fs/ntfs3/dir.c:337 [inline]
       ntfs_read_hdr+0x8dd/0xaf0 fs/ntfs3/dir.c:385
       ntfs_readdir+0x6cd/0x10b0 fs/ntfs3/dir.c:496
       iterate_dir+0x296/0xaf0 fs/readdir.c:108
       __do_sys_getdents fs/readdir.c:326 [inline]
       __se_sys_getdents fs/readdir.c:312 [inline]
       __x64_sys_getdents+0x13c/0x2b0 fs/readdir.c:312
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0x4c0 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.3.214/6607:
 #0: ffff888030820d38 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x2a2/0x370 fs/file.c:1232
 #1: ffff88806ad37918 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: iterate_dir+0x18b/0xaf0 fs/readdir.c:101
 #2: ffff88802d52c270 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x41e/0x740 fs/ntfs3/run.c:1100

stack backtrace:
CPU: 0 UID: 0 PID: 6607 Comm: syz.3.214 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2043
 check_noncircular+0x14c/0x170 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 kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
 down_read+0x9b/0x480 kernel/locking/rwsem.c:1537
 run_unpack_ex+0x671/0x740 fs/ntfs3/run.c:1119
 ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
 ntfs_iget5+0xd97/0x3ab0 fs/ntfs3/inode.c:540
 ntfs_dir_emit fs/ntfs3/dir.c:337 [inline]
 ntfs_read_hdr+0x8dd/0xaf0 fs/ntfs3/dir.c:385
 ntfs_readdir+0x6cd/0x10b0 fs/ntfs3/dir.c:496
 iterate_dir+0x296/0xaf0 fs/readdir.c:108
 __do_sys_getdents fs/readdir.c:326 [inline]
 __se_sys_getdents fs/readdir.c:312 [inline]
 __x64_sys_getdents+0x13c/0x2b0 fs/readdir.c:312
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6d62b8ebe9
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:00007f6d6394f038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f6d62db5fa0 RCX: 00007f6d62b8ebe9
RDX: 00000000000000b8 RSI: 0000200000001fc0 RDI: 0000000000000004
RBP: 00007f6d62c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6d62db6038 R14: 00007f6d62db5fa0 R15: 00007fff1687ac28
 </TASK>