loop0: detected capacity change from 0 to 4096
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.1333/9752 is trying to acquire lock:
ffff88802402a270 (&wnd->rw_lock){++++}-{3:3}, at: mark_as_free_ex+0x3e/0x380 fs/ntfs3/fsntfs.c:2491

but task is already holding lock:
ffff8880565b6190 (&ni->file.run_lock#2){++++}-{3:3}, at: attr_collapse_range+0x3b1/0x17f0 fs/ntfs3/attrib.c:1916

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ni->file.run_lock#2){++++}-{3:3}:
       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_getdents fs/readdir.c:322 [inline]
       __se_sys_getdents+0xf6/0x260 fs/readdir.c:307
       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 (&wnd->rw_lock){++++}-{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_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

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.0.1333/9752:
 #0: ffff88802257e418 (sb_writers#20){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2711 [inline]
 #0: ffff88802257e418 (sb_writers#20){.+.+}-{0:0}, at: vfs_fallocate+0x4fb/0x700 fs/open.c:323
 #1: ffff8880565b6390 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
 #1: ffff8880565b6390 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: ntfs_fallocate+0x2fb/0x1040 fs/ntfs3/file.c:473
 #2: ffff8880565b6520 (mapping.invalidate_lock#6){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:849 [inline]
 #2: ffff8880565b6520 (mapping.invalidate_lock#6){++++}-{3:3}, at: ntfs_fallocate+0x3bf/0x1040 fs/ntfs3/file.c:487
 #3: ffff8880565b60e0 (&ni->ni_lock#3/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1120 [inline]
 #3: ffff8880565b60e0 (&ni->ni_lock#3/5){+.+.}-{3:3}, at: ntfs_fallocate+0x7a7/0x1040 fs/ntfs3/file.c:557
 #4: ffff8880565b6190 (&ni->file.run_lock#2){++++}-{3:3}, at: attr_collapse_range+0x3b1/0x17f0 fs/ntfs3/attrib.c:1916

stack backtrace:
CPU: 0 PID: 9752 Comm: syz.0.1333 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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_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
RIP: 0033:0x7fbcc959c799
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:00007fbcca399028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fbcc9815fa0 RCX: 00007fbcc959c799
RDX: 0000000000004000 RSI: 0000000000000008 RDI: 0000000000000004
RBP: 00007fbcc9632bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbcc9816038 R14: 00007fbcc9815fa0 R15: 00007ffd3aed3738
 </TASK>