============================================ WARNING: possible recursive locking detected 5.15.167-syzkaller #0 Not tainted -------------------------------------------- syz-executor/4511 is trying to acquire lock: ffff8880757c9e80 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1100 [inline] ffff8880757c9e80 (&ni->ni_lock/4){+.+.}-{3:3}, at: mi_read+0x2dd/0x5a0 fs/ntfs3/record.c:148 but task is already holding lock: ffff8880757cd980 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1100 [inline] ffff8880757cd980 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_lookup+0xf5/0x1f0 fs/ntfs3/namei.c:82 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&ni->ni_lock/4); lock(&ni->ni_lock/4); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor/4511: #0: ffff8880757cdc20 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:799 [inline] #0: ffff8880757cdc20 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1679 #1: ffff8880757cd980 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1100 [inline] #1: ffff8880757cd980 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_lookup+0xf5/0x1f0 fs/ntfs3/namei.c:82 stack backtrace: CPU: 1 PID: 4511 Comm: syz-executor Not tainted 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_deadlock_bug kernel/locking/lockdep.c:2946 [inline] check_deadlock kernel/locking/lockdep.c:2989 [inline] validate_chain+0x46d2/0x5930 kernel/locking/lockdep.c:3775 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 ni_lock fs/ntfs3/ntfs_fs.h:1100 [inline] mi_read+0x2dd/0x5a0 fs/ntfs3/record.c:148 ntfs_read_mft fs/ntfs3/inode.c:69 [inline] ntfs_iget5+0x472/0x38e0 fs/ntfs3/inode.c:525 dir_search_u+0x2f6/0x390 fs/ntfs3/dir.c:264 ntfs_lookup+0x102/0x1f0 fs/ntfs3/namei.c:83 __lookup_slow+0x275/0x3d0 fs/namei.c:1663 lookup_slow+0x53/0x70 fs/namei.c:1680 walk_component+0x48c/0x610 fs/namei.c:1976 lookup_last fs/namei.c:2431 [inline] path_lookupat+0x16f/0x450 fs/namei.c:2455 filename_lookup+0x230/0x5c0 fs/namei.c:2484 user_path_at_empty+0x40/0x180 fs/namei.c:2883 user_path_at include/linux/namei.h:57 [inline] ksys_umount fs/namespace.c:1779 [inline] __do_sys_umount fs/namespace.c:1787 [inline] __se_sys_umount fs/namespace.c:1785 [inline] __x64_sys_umount+0xf0/0x170 fs/namespace.c:1785 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f5329ba5327 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007fff58c59d78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5329ba5327 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff58c59e30 RBP: 00007fff58c59e30 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff58c5af20 R13: 00007f5329c16134 R14: 000000000001c43e R15: 00007fff58c5bfe0 ntfs3: loop1: ntfs_evict_inode r=5 failed, -22.