ntfs3(loop3): Failed to initialize $Extend/$Reparse. ntfs3(loop3): ino=1b, mi_enum_attr ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.3.3087/20049 is trying to acquire lock: ffff888058222640 (&ni->file.run_lock#2){++++}-{4:4}, at: run_unpack_ex+0x7e5/0xba0 fs/ntfs3/run.c:1135 but task is already holding lock: ffff8880435c2278 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x701/0xba0 fs/ntfs3/run.c:1116 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&wnd->rw_lock){++++}-{4:4}: down_write_nested+0x9d/0x200 kernel/locking/rwsem.c:1706 ntfs_look_for_free_space+0xd3/0x600 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x1c2/0x750 fs/ntfs3/attrib.c:159 attr_set_size+0x14ef/0x2cf0 fs/ntfs3/attrib.c:582 ntfs_extend_mft+0x162/0x450 fs/ntfs3/fsntfs.c:512 ntfs_look_free_mft+0x5f8/0xd50 fs/ntfs3/fsntfs.c:709 ntfs_create_inode+0x580/0x33b0 fs/ntfs3/inode.c:1298 ntfs_mkdir+0x3d/0x50 fs/ntfs3/namei.c:215 vfs_mkdir+0x414/0x630 fs/namei.c:5231 filename_mkdirat+0x27b/0x500 fs/namei.c:5264 __do_sys_mkdirat fs/namei.c:5285 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5282 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ni->file.run_lock#2){++++}-{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+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868 down_read+0x47/0x2e0 kernel/locking/rwsem.c:1537 run_unpack_ex+0x7e5/0xba0 fs/ntfs3/run.c:1135 ntfs_read_mft fs/ntfs3/inode.c:400 [inline] ntfs_iget5+0x238b/0x3860 fs/ntfs3/inode.c:541 dir_search_u+0x1df/0x2c0 fs/ntfs3/dir.c:265 ntfs_lookup+0x100/0x1d0 fs/ntfs3/namei.c:85 __lookup_slow+0x297/0x3d0 fs/namei.c:1916 lookup_slow+0x53/0x70 fs/namei.c:1933 walk_component fs/namei.c:2279 [inline] lookup_last fs/namei.c:2780 [inline] path_lookupat+0x3f5/0x8c0 fs/namei.c:2804 filename_lookup+0x212/0x570 fs/namei.c:2833 filename_removexattr fs/xattr.c:1033 [inline] path_removexattrat+0x196/0x6a0 fs/xattr.c:1071 __do_sys_lremovexattr fs/xattr.c:1089 [inline] __se_sys_lremovexattr fs/xattr.c:1086 [inline] __x64_sys_lremovexattr+0x65/0x80 fs/xattr.c:1086 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/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(&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.3.3087/20049: #0: ffff88805604f150 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1043 [inline] #0: ffff88805604f150 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: lookup_slow+0x46/0x70 fs/namei.c:1932 #1: ffff88805604eeb0 (&ni->ni_lock/6){+.+.}-{4:4}, at: ni_lock_dir fs/ntfs3/ntfs_fs.h:1157 [inline] #1: ffff88805604eeb0 (&ni->ni_lock/6){+.+.}-{4:4}, at: ntfs_lookup+0xf3/0x1d0 fs/ntfs3/namei.c:84 #2: ffff8880435c2278 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x701/0xba0 fs/ntfs3/run.c:1116 stack backtrace: CPU: 0 UID: 0 PID: 20049 Comm: syz.3.3087 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 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+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868 down_read+0x47/0x2e0 kernel/locking/rwsem.c:1537 run_unpack_ex+0x7e5/0xba0 fs/ntfs3/run.c:1135 ntfs_read_mft fs/ntfs3/inode.c:400 [inline] ntfs_iget5+0x238b/0x3860 fs/ntfs3/inode.c:541 dir_search_u+0x1df/0x2c0 fs/ntfs3/dir.c:265 ntfs_lookup+0x100/0x1d0 fs/ntfs3/namei.c:85 __lookup_slow+0x297/0x3d0 fs/namei.c:1916 lookup_slow+0x53/0x70 fs/namei.c:1933 walk_component fs/namei.c:2279 [inline] lookup_last fs/namei.c:2780 [inline] path_lookupat+0x3f5/0x8c0 fs/namei.c:2804 filename_lookup+0x212/0x570 fs/namei.c:2833 filename_removexattr fs/xattr.c:1033 [inline] path_removexattrat+0x196/0x6a0 fs/xattr.c:1071 __do_sys_lremovexattr fs/xattr.c:1089 [inline] __se_sys_lremovexattr fs/xattr.c:1086 [inline] __x64_sys_lremovexattr+0x65/0x80 fs/xattr.c:1086 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fed1f58f749 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:00007fed204cd038 EFLAGS: 00000246 ORIG_RAX: 00000000000000c6 RAX: ffffffffffffffda RBX: 00007fed1f7e5fa0 RCX: 00007fed1f58f749 RDX: 0000000000000000 RSI: 0000200000000200 RDI: 00002000000001c0 RBP: 00007fed1f613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fed1f7e6038 R14: 00007fed1f7e5fa0 R15: 00007ffcdac70198