ntfs3: loop7: failed to convert "0080" to cp852
ntfs3: loop7: Mark volume as dirty due to NTFS errors
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.7.1706/14140 is trying to acquire lock:
ffff88805a392df0 (&ni->file.run_lock#2){++++}-{3:3}, at: run_unpack_ex+0x7fb/0xb80 fs/ntfs3/run.c:1126

but task is already holding lock:
ffff88804d802270 (&wnd->rw_lock){++++}-{3:3}, at: run_unpack_ex+0x733/0xb80 fs/ntfs3/run.c:1107

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&wnd->rw_lock){++++}-{3:3}:
       down_write_nested+0x9e/0x200 kernel/locking/rwsem.c:1689
       mark_as_free_ex+0x3e/0x380 fs/ntfs3/fsntfs.c:2491
       run_deallocate_ex+0x19b/0x310 fs/ntfs3/attrib.c:122
       attr_collapse_range+0xcac/0x17f0 fs/ntfs3/attrib.c:1984
       ntfs_fallocate+0x7bb/0x1040 fs/ntfs3/file.c:558
       vfs_fallocate+0x58e/0x700 fs/open.c:324
       ksys_fallocate fs/open.c:347 [inline]
       __do_sys_fallocate fs/open.c:355 [inline]
       __se_sys_fallocate fs/open.c:353 [inline]
       __x64_sys_fallocate+0xc1/0x110 fs/open.c:353
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&ni->file.run_lock#2){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2df1/0x7d40 kernel/locking/lockdep.c:5137
       lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
       down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520
       run_unpack_ex+0x7fb/0xb80 fs/ntfs3/run.c:1126
       ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
       ntfs_iget5+0x2475/0x38a0 fs/ntfs3/inode.c:535
       ntfs_dir_emit fs/ntfs3/dir.c:338 [inline]
       ntfs_read_hdr+0x7d4/0xc30 fs/ntfs3/dir.c:386
       ntfs_readdir+0xacb/0xeb0 fs/ntfs3/dir.c:497
       iterate_dir+0x1c2/0x580 fs/readdir.c:106
       __do_sys_getdents64 fs/readdir.c:405 [inline]
       __se_sys_getdents64+0xf6/0x270 fs/readdir.c:390
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

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.7.1706/14140:
 #0: ffff88802ce79c48 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2a3/0x330 fs/file.c:1040
 #1: ffff88805e6b6af0 (&type->i_mutex_dir_key#10){++++}-{3:3}, at: iterate_dir+0xcb/0x580 fs/readdir.c:99
 #2: ffff88804d802270 (&wnd->rw_lock){++++}-{3:3}, at: run_unpack_ex+0x733/0xb80 fs/ntfs3/run.c:1107

stack backtrace:
CPU: 1 PID: 14140 Comm: syz.7.1706 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 check_noncircular+0x2fc/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2df1/0x7d40 kernel/locking/lockdep.c:5137
 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520
 run_unpack_ex+0x7fb/0xb80 fs/ntfs3/run.c:1126
 ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
 ntfs_iget5+0x2475/0x38a0 fs/ntfs3/inode.c:535
 ntfs_dir_emit fs/ntfs3/dir.c:338 [inline]
 ntfs_read_hdr+0x7d4/0xc30 fs/ntfs3/dir.c:386
 ntfs_readdir+0xacb/0xeb0 fs/ntfs3/dir.c:497
 iterate_dir+0x1c2/0x580 fs/readdir.c:106
 __do_sys_getdents64 fs/readdir.c:405 [inline]
 __se_sys_getdents64+0xf6/0x270 fs/readdir.c:390
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc235b9aeb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc236a97028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fc235e15fa0 RCX: 00007fc235b9aeb9
RDX: 000000000000100c RSI: 0000200000002fc0 RDI: 0000000000000004
RBP: 00007fc235c08c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc235e16038 R14: 00007fc235e15fa0 R15: 00007ffc017a1858
 </TASK>
ntfs3: loop7: failed to convert name for inode 1e.