============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz.2.355/8443 is trying to acquire lock: ffff0000fef53468 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline] ffff0000fef53468 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: mi_read+0x258/0x4cc fs/ntfs3/record.c:148 but task is already holding lock: ffff0000fec60100 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline] ffff0000fec60100 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_rename+0x584/0x9f4 fs/ntfs3/namei.c:328 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&ni->ni_lock#3/5); lock(&ni->ni_lock#3/5); *** DEADLOCK *** May be due to missing lock nesting notation 6 locks held by syz.2.355/8443: #0: ffff0000cc0b6428 (sb_writers#21){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:557 #1: ffff0000fef57918 (&type->i_mutex_dir_key#15/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #1: ffff0000fef57918 (&type->i_mutex_dir_key#15/1){+.+.}-{4:4}, at: lock_rename fs/namei.c:3272 [inline] #1: ffff0000fef57918 (&type->i_mutex_dir_key#15/1){+.+.}-{4:4}, at: do_renameat2+0x364/0x8c8 fs/namei.c:5224 #2: ffff0000fec60398 (&sb->s_type->i_mutex_key#33/4){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #2: ffff0000fec60398 (&sb->s_type->i_mutex_key#33/4){+.+.}-{4:4}, at: lock_two_nondirectories+0xf0/0x150 fs/inode.c:1234 #3: ffff0000fef57680 (&ni->ni_lock/6){+.+.}-{4:4}, at: ni_lock_dir fs/ntfs3/ntfs_fs.h:1118 [inline] #3: ffff0000fef57680 (&ni->ni_lock/6){+.+.}-{4:4}, at: ntfs_rename+0x574/0x9f4 fs/ntfs3/namei.c:327 #4: ffff0000fec60100 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline] #4: ffff0000fec60100 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_rename+0x584/0x9f4 fs/ntfs3/namei.c:328 #5: ffff0000d6960128 (&wnd->rw_lock/1){+.+.}-{4:4}, at: ntfs_look_free_mft+0x134/0xb1c fs/ntfs3/fsntfs.c:571 stack backtrace: CPU: 1 UID: 0 PID: 8443 Comm: syz.2.355 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_deadlock_bug+0x2e8/0x2f0 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x2940/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598 __mutex_lock kernel/locking/mutex.c:760 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812 ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline] mi_read+0x258/0x4cc fs/ntfs3/record.c:148 mi_format_new+0x180/0x51c fs/ntfs3/record.c:434 ni_add_subrecord+0xc8/0x3c4 fs/ntfs3/frecord.c:321 ntfs_look_free_mft+0x3c8/0xb1c fs/ntfs3/fsntfs.c:715 ni_create_attr_list+0x804/0x1184 fs/ntfs3/frecord.c:826 ni_ins_attr_ext+0x3d0/0x9c8 fs/ntfs3/frecord.c:924 ni_insert_attr fs/ntfs3/frecord.c:1091 [inline] ni_insert_resident fs/ntfs3/frecord.c:1475 [inline] ni_add_name+0x5a0/0xae4 fs/ntfs3/frecord.c:2987 ni_rename+0x54/0x118 fs/ntfs3/frecord.c:3026 ntfs_rename+0x5bc/0x9f4 fs/ntfs3/namei.c:332 vfs_rename+0x934/0xce0 fs/namei.c:5129 do_renameat2+0x614/0x8c8 fs/namei.c:5278 __do_sys_renameat2 fs/namei.c:5312 [inline] __se_sys_renameat2 fs/namei.c:5309 [inline] __arm64_sys_renameat2+0xd8/0xf4 fs/namei.c:5309 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596