syzbot

loop0: detected capacity change from 0 to 4096
ntfs3(loop0): Different NTFS sector size (4096) and media sector size (512).
ntfs3(loop0): ino=19, mi_enum_attr
ntfs3(loop0): Mark volume as dirty due to NTFS errors
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.10296/30126 is trying to acquire lock:
ffff888051aa0270 (&wnd->rw_lock){++++}-{4:4}, at: mark_as_free_ex+0x4d/0x430 fs/ntfs3/fsntfs.c:2464

but task is already holding lock:
ffff88804d4df630 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_truncate fs/ntfs3/file.c:483 [inline]
ffff88804d4df630 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_setattr+0x579/0xda0 fs/ntfs3/file.c:806

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ni->file.run_lock#2){++++}-{4:4}:
       down_read+0x9b/0x460 kernel/locking/rwsem.c:1537
       run_unpack_ex+0x671/0x740 fs/ntfs3/run.c:1124
       ntfs_read_mft fs/ntfs3/inode.c:401 [inline]
       ntfs_iget5+0xda0/0x3a90 fs/ntfs3/inode.c:541
       dir_search_u+0x163/0x3a0 fs/ntfs3/dir.c:264
       ntfs_lookup+0x1c5/0x2a0 fs/ntfs3/namei.c:85
       __lookup_slow+0x251/0x460 fs/namei.c:1858
       lookup_slow+0x50/0x70 fs/namei.c:1875
       walk_component fs/namei.c:2221 [inline]
       lookup_last fs/namei.c:2722 [inline]
       path_lookupat+0x5e9/0xc40 fs/namei.c:2746
       filename_lookup+0x224/0x5f0 fs/namei.c:2775
       user_path_at+0x3a/0x60 fs/namei.c:3567
       do_fchownat+0xf9/0x200 fs/open.c:813
       __do_sys_chown fs/open.c:839 [inline]
       __se_sys_chown fs/open.c:837 [inline]
       __x64_sys_chown+0x7b/0xc0 fs/open.c:837
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&wnd->rw_lock){++++}-{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+0x1542/0x22f0 kernel/locking/lockdep.c:5237
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825
       down_write_nested+0x96/0x210 kernel/locking/rwsem.c:1706
       mark_as_free_ex+0x4d/0x430 fs/ntfs3/fsntfs.c:2464
       run_deallocate_ex+0x1f4/0x310 fs/ntfs3/attrib.c:122
       attr_set_size+0xc5f/0x2c50 fs/ntfs3/attrib.c:753
       ntfs_truncate fs/ntfs3/file.c:484 [inline]
       ntfs_setattr+0x643/0xda0 fs/ntfs3/file.c:806
       notify_change+0x6d2/0x1290 fs/attr.c:546
       do_truncate+0x1d7/0x230 fs/open.c:68
       handle_truncate fs/namei.c:4235 [inline]
       do_open fs/namei.c:4632 [inline]
       path_openat+0x2a1a/0x3140 fs/namei.c:4787
       do_filp_open+0x20b/0x470 fs/namei.c:4814
       do_sys_openat2+0x11f/0x280 fs/open.c:1430
       do_sys_open fs/open.c:1436 [inline]
       __do_sys_openat fs/open.c:1452 [inline]
       __se_sys_openat fs/open.c:1447 [inline]
       __x64_sys_openat+0x174/0x210 fs/open.c:1447
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0xf80 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(&ni->file.run_lock#2);
                               lock(&wnd->rw_lock);
                               lock(&ni->file.run_lock#2);
  lock(&wnd->rw_lock);

 *** DEADLOCK ***

4 locks held by syz.0.10296/30126:
 #0: ffff88805187a420 (sb_writers#23){.+.+}-{0:0}, at: do_open fs/namei.c:4621 [inline]
 #0: ffff88805187a420 (sb_writers#23){.+.+}-{0:0}, at: path_openat+0x25bd/0x3140 fs/namei.c:4787
 #1: ffff88804d4df818 (&sb->s_type->i_mutex_key#30){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1032 [inline]
 #1: ffff88804d4df818 (&sb->s_type->i_mutex_key#30){+.+.}-{4:4}, at: do_truncate+0x146/0x230 fs/open.c:63
 #2: ffff88804d4df580 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline]
 #2: ffff88804d4df580 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_truncate fs/ntfs3/file.c:481 [inline]
 #2: ffff88804d4df580 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_setattr+0x563/0xda0 fs/ntfs3/file.c:806
 #3: ffff88804d4df630 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_truncate fs/ntfs3/file.c:483 [inline]
 #3: ffff88804d4df630 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_setattr+0x579/0xda0 fs/ntfs3/file.c:806

stack backtrace:
CPU: 0 UID: 0 PID: 30126 Comm: syz.0.10296 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x2db/0x410 kernel/locking/lockdep.c:2043
 check_noncircular+0x146/0x160 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 kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x1542/0x22f0 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825
 down_write_nested+0x96/0x210 kernel/locking/rwsem.c:1706
 mark_as_free_ex+0x4d/0x430 fs/ntfs3/fsntfs.c:2464
 run_deallocate_ex+0x1f4/0x310 fs/ntfs3/attrib.c:122
 attr_set_size+0xc5f/0x2c50 fs/ntfs3/attrib.c:753
 ntfs_truncate fs/ntfs3/file.c:484 [inline]
 ntfs_setattr+0x643/0xda0 fs/ntfs3/file.c:806
 notify_change+0x6d2/0x1290 fs/attr.c:546
 do_truncate+0x1d7/0x230 fs/open.c:68
 handle_truncate fs/namei.c:4235 [inline]
 do_open fs/namei.c:4632 [inline]
 path_openat+0x2a1a/0x3140 fs/namei.c:4787
 do_filp_open+0x20b/0x470 fs/namei.c:4814
 do_sys_openat2+0x11f/0x280 fs/open.c:1430
 do_sys_open fs/open.c:1436 [inline]
 __do_sys_openat fs/open.c:1452 [inline]
 __se_sys_openat fs/open.c:1447 [inline]
 __x64_sys_openat+0x174/0x210 fs/open.c:1447
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdaa558f749
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:00007fdaa6435038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fdaa57e5fa0 RCX: 00007fdaa558f749
RDX: 0000000000183341 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007fdaa5613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdaa57e6038 R14: 00007fdaa57e5fa0 R15: 00007ffccae48f18
 </TASK>