====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc3-syzkaller-00190-g67a993863163 #0 Not tainted ------------------------------------------------------ syz.7.169/7511 is trying to acquire lock: ffff888058b6e270 (&wnd->rw_lock){++++}-{4:4}, at: ntfs_look_for_free_space+0xd3/0x600 fs/ntfs3/fsntfs.c:362 but task is already holding lock: ffff888059be2668 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_extend_mft+0x13d/0x450 fs/ntfs3/fsntfs.c:511 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ni->file.run_lock#2){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1524 run_unpack_ex+0x7e5/0xba0 fs/ntfs3/run.c:1119 ntfs_read_mft fs/ntfs3/inode.c:401 [inline] ntfs_iget5+0x232b/0x37c0 fs/ntfs3/inode.c:540 dir_search_u+0x1df/0x2c0 fs/ntfs3/dir.c:264 ntfs_lookup+0xfb/0x1f0 fs/ntfs3/namei.c:85 lookup_open fs/namei.c:3695 [inline] open_last_lookups fs/namei.c:3816 [inline] path_openat+0x1101/0x3830 fs/namei.c:4052 do_filp_open+0x1fa/0x410 fs/namei.c:4082 do_sys_openat2+0x121/0x1c0 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1463 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 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:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write_nested+0x9d/0x200 kernel/locking/rwsem.c:1693 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+0x51f/0x3340 fs/ntfs3/inode.c:1272 ntfs_mkdir+0x3d/0x50 fs/ntfs3/namei.c:207 vfs_mkdir+0x306/0x510 fs/namei.c:4375 do_mkdirat+0x247/0x590 fs/namei.c:4408 __do_sys_mkdirat fs/namei.c:4425 [inline] __se_sys_mkdirat fs/namei.c:4423 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4423 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 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 *** 5 locks held by syz.7.169/7511: #0: ffff888058b6c428 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff888059a25460 (&type->i_mutex_dir_key#10/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #1: ffff888059a25460 (&type->i_mutex_dir_key#10/1){+.+.}-{4:4}, at: filename_create+0x1f9/0x470 fs/namei.c:4148 #2: ffff888059a251c8 (&ni->ni_lock#3/6){+.+.}-{4:4}, at: ni_lock_dir fs/ntfs3/ntfs_fs.h:1105 [inline] #2: ffff888059a251c8 (&ni->ni_lock#3/6){+.+.}-{4:4}, at: ntfs_create_inode+0x166/0x3340 fs/ntfs3/inode.c:1186 #3: ffff888058b6e128 (&wnd->rw_lock/1){+.+.}-{4:4}, at: ntfs_look_free_mft+0x163/0xd50 fs/ntfs3/fsntfs.c:571 #4: ffff888059be2668 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_extend_mft+0x13d/0x450 fs/ntfs3/fsntfs.c:511 stack backtrace: CPU: 0 UID: 0 PID: 7511 Comm: syz.7.169 Not tainted 6.16.0-rc3-syzkaller-00190-g67a993863163 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2046 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write_nested+0x9d/0x200 kernel/locking/rwsem.c:1693 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+0x51f/0x3340 fs/ntfs3/inode.c:1272 ntfs_mkdir+0x3d/0x50 fs/ntfs3/namei.c:207 vfs_mkdir+0x306/0x510 fs/namei.c:4375 do_mkdirat+0x247/0x590 fs/namei.c:4408 __do_sys_mkdirat fs/namei.c:4425 [inline] __se_sys_mkdirat fs/namei.c:4423 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4423 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f73a8b8d197 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 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:00007f73a999ee68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f73a999eef0 RCX: 00007f73a8b8d197 RDX: 00000000000001ff RSI: 0000200000000400 RDI: 00000000ffffff9c RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000400 R13: 00007f73a999eeb0 R14: 0000000000000000 R15: 0000000000000000 ntfs3(loop7): ino=0, attr_set_size