ntfs3: loop3: Failed to initialize $Extend. ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.7701/30336 is trying to acquire lock: ffff88807b8fc270 (&wnd->rw_lock){++++}-{3:3}, at: ntfs_look_for_free_space+0xda/0x650 fs/ntfs3/fsntfs.c:362 but task is already holding lock: ffff88805e8cc410 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_extend_mft+0x145/0x460 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){++++}-{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 dir_search_u+0x1fe/0x2e0 fs/ntfs3/dir.c:264 ntfs_atomic_open+0x23b/0x520 fs/ntfs3/namei.c:408 atomic_open fs/namei.c:3359 [inline] lookup_open fs/namei.c:3467 [inline] open_last_lookups fs/namei.c:3564 [inline] path_openat+0xf49/0x3230 fs/namei.c:3794 do_filp_open+0x1f5/0x430 fs/namei.c:3824 do_sys_openat2+0x134/0x1d0 fs/open.c:1421 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+0x139/0x160 fs/open.c:1447 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 ntfs_look_for_free_space+0xda/0x650 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x1be/0x6b0 fs/ntfs3/attrib.c:159 attr_set_size+0x1516/0x2d70 fs/ntfs3/attrib.c:577 ntfs_extend_mft+0x16a/0x460 fs/ntfs3/fsntfs.c:512 ntfs_look_free_mft+0x644/0xd70 fs/ntfs3/fsntfs.c:709 ntfs_create_inode+0x53d/0x3700 fs/ntfs3/inode.c:1345 ntfs_create+0x42/0x60 fs/ntfs3/namei.c:112 vfs_create+0x1f4/0x360 fs/namei.c:3198 do_mknodat+0x3d0/0x500 fs/namei.c:4049 __do_sys_mknod fs/namei.c:4082 [inline] __se_sys_mknod fs/namei.c:4080 [inline] __x64_sys_mknod+0x8e/0xa0 fs/namei.c:4080 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.3.7701/30336: #0: ffff88807b8fa418 (sb_writers#19){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:412 #1: ffff88805e8ceaf0 (&type->i_mutex_dir_key#13/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline] #1: ffff88805e8ceaf0 (&type->i_mutex_dir_key#13/1){+.+.}-{3:3}, at: filename_create+0x20c/0x480 fs/namei.c:3890 #2: ffff88805e8ce840 (&ni->ni_lock/6){+.+.}-{3:3}, at: ni_lock_dir fs/ntfs3/ntfs_fs.h:1125 [inline] #2: ffff88805e8ce840 (&ni->ni_lock/6){+.+.}-{3:3}, at: ntfs_create_inode+0x18c/0x3700 fs/ntfs3/inode.c:1259 #3: ffff88807b8fc128 (&wnd->rw_lock/1){+.+.}-{3:3}, at: ntfs_look_free_mft+0x171/0xd70 fs/ntfs3/fsntfs.c:571 #4: ffff88805e8cc410 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_extend_mft+0x145/0x460 fs/ntfs3/fsntfs.c:511 stack backtrace: CPU: 0 PID: 30336 Comm: syz.3.7701 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: 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 ntfs_look_for_free_space+0xda/0x650 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x1be/0x6b0 fs/ntfs3/attrib.c:159 attr_set_size+0x1516/0x2d70 fs/ntfs3/attrib.c:577 ntfs_extend_mft+0x16a/0x460 fs/ntfs3/fsntfs.c:512 ntfs_look_free_mft+0x644/0xd70 fs/ntfs3/fsntfs.c:709 ntfs_create_inode+0x53d/0x3700 fs/ntfs3/inode.c:1345 ntfs_create+0x42/0x60 fs/ntfs3/namei.c:112 vfs_create+0x1f4/0x360 fs/namei.c:3198 do_mknodat+0x3d0/0x500 fs/namei.c:4049 __do_sys_mknod fs/namei.c:4082 [inline] __se_sys_mknod fs/namei.c:4080 [inline] __x64_sys_mknod+0x8e/0xa0 fs/namei.c:4080 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: 0033:0x7f874e99ce59 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:00007f874f782028 EFLAGS: 00000246 ORIG_RAX: 0000000000000085 RAX: ffffffffffffffda RBX: 00007f874ec15fa0 RCX: 00007f874e99ce59 RDX: 0000000000000707 RSI: 0000000000000000 RDI: 0000200000000000 RBP: 00007f874ea32d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f874ec16038 R14: 00007f874ec15fa0 R15: 00007ffdb635fa78 ntfs3: loop3: ino=0, attr_set_size